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# {{{ Banner
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# ============================================================================
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#
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# ethernet.tcl
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#
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# Ethernet support for the eCos synthetic target I/O auxiliary
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#
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# ============================================================================
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# ####COPYRIGHTBEGIN####
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#
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# ----------------------------------------------------------------------------
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# Copyright (C) 2002 Bart Veer
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#
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# This file is part of the eCos host tools.
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the Free
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# Software Foundation; either version 2 of the License, or (at your option)
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# any later version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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# more details.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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# ----------------------------------------------------------------------------
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#
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# ####COPYRIGHTEND####
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# ============================================================================
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# #####DESCRIPTIONBEGIN####
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#
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# Author(s): bartv
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# Contact(s): bartv
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# Date: 2002/08/07
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# Version: 0.01
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# Description:
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# Implementation of the ethernet device. This script should only ever
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# be run from inside the ecosynth auxiliary.
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#
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# ####DESCRIPTIONEND####
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# ============================================================================
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# }}}
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# Overview.
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#
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# Linux provides a number of different ways of performing low-level
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# ethernet I/O from user space, including accessing an otherwise
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# unused ethernet card via a PF_PACKET socket, and the tap facility.
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# The necessary functionality is not readily accessible from Tcl,
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# and performing this low-level I/O generally requires special
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# privileges. Therefore the actual I/O happens in a C program
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# rawether, installed suid root,
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#
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# The synthetic ethernet package supports up to four ethernet devices,
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# eth0 to eth3. The target definition file maps these onto the
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# underlying I/O facility. Instantiation requires spawning a rawether
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# process with appropriate arguments, and then waiting for a message
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# from that process indicating whether or not the instantiation
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# succeeded. That message includes the MAC address. A file event
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# handler is installed to handle data detected by raw ether.
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#
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# eCos can send a number of requests: transmit a packet, start the
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# interface (possibly in promiscuous mode), stop the interface,
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# or get the various parameters such as the MAC address. All those
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# requests can just be passed on to the rawether process. Incoming
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# ethernet packets are slightly more complicated: rawether will
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# immediately pass these up to this Tcl script, which will buffer
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# the packets until they are requested by eCos; in addition an
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# interrupt will be raised.
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namespace eval ethernet {
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# The protocol between eCos and this script.
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variable SYNTH_ETH_TX 0x01
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variable SYNTH_ETH_RX 0x02
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variable SYNTH_ETH_START 0x03
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variable SYNTH_ETH_STOP 0x04
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variable SYNTH_ETH_GETPARAMS 0x05
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variable SYNTH_ETH_MULTIALL 0x06
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# This array holds all the interesting data for all the
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# interfaces, indexed by the instance id. It is also useful
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# to keep track of the instance id's associated with ethernet
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# devices.
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array set data [list]
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set ids [list]
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# One-off initialization, for example loading images. If this fails
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# then all attempts at instantiation will fail as well.
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variable init_ok 1
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variable install_dir $synth::device_install_dir
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variable rawether_executable [file join $ethernet::install_dir "rawether"]
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if { ![file exists $rawether_executable] } {
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synth::report_error "Ethernet device, rawether executable has not been installed in $ethernet::install_dir.\n"
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set init_ok 0
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} elseif { ![file executable $rawether_executable] } {
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synth::report_error "Ethernet device, installed program $rawether_executable is not executable.\n"
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set init_ok 0
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}
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if { $synth::flag_gui } {
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foreach _image [list "netrecord.xbm"] {
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variable image_[file rootname $_image]
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if { ! [synth::load_image "ethernet::image_[file rootname $_image]" [file join $ethernet::install_dir $_image]] } {
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set init_ok 0
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}
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}
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unset _image
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}
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# Maximum number of packets that should be buffered per interface.
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# This can be changed in the target definition
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variable max_buffered_packets 16
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if { [synth::tdf_has_option "ethernet" "max_buffer"] } {
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set ethernet::max_buffered_packets [synth::tdf_get_option "ethernet" "max_buffer"]
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if { ![string is integer -strict $ethernet::max_buffered_packets] } {
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synth::report_error "Ethernet device, invalid value in target definition file $synth::target_definition\n \
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Entry max_buffer should be a simple integer, not $ethernet::max_buffered_packets\n"
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set init_ok 0
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}
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}
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# Define hooks for tx and rx packets
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synth::hook_define "ethernet_tx"
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synth::hook_define "ethernet_rx"
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# Get a list of known ethernet devices
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proc devices_get_list { } {
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set result [list]
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foreach id $ids {
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lappend result $::ethernet::data($id,name)
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}
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return $result
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}
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# ----------------------------------------------------------------------------
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proc instantiate { id name data } {
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if { ! $ethernet::init_ok } {
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synth::report_warning "Cannot instantiate ethernet device $name, initialization failed.\n"
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return ""
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}
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# id is a small number that uniquely identifies this device. It will
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# be used as an array index.
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# name is something like eth0 or eth1
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# There should be no device-specific data
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# The hard work is done by an auxiliary process which needs to be
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# spawned off. It requires some additional information to map the
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# eCos device name on to a suitable Linux network device such
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# as tap0. That information has to come from the config file.
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if { ![synth::tdf_has_option "ethernet" $name] } {
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synth::report_error "Cannot instantiate ethernet device $name\n \
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No entry in target definition file $synth::target_definition\n"
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return ""
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}
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set use [synth::tdf_get_option "ethernet" $name]
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# Do some validation here, before the rawether process is started.
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# Typical entries would look like
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# eth0 real eth1
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# eth1 ethertap [[tap-device] [MAC]]
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set junk ""
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set optional ""
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set mac ""
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if { [regexp -- {^\s*real\s*[a-zA-z0-9_]+$} $use] } {
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# Real ethernet.
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} elseif { [regexp -- {^\s*ethertap\s*(.*)$} $use junk optional ] } {
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if { "" != $optional } {
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if { ! [regexp -- {^tap[0-9]+\s*(.*)$} $optional junk mac ] } {
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synth::report_error "Cannot instantiate ethernet device $name\n \
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Invalid entry \"$use\" in target definition file $synth::target_definition\n \
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Should be \"ethertap \[<tap-device> \[<MAC address>\]\]\"\n"
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return ""
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}
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if { "" != $mac } {
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if { ! [regexp -- {^\s*([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}\s*} $mac ] } {
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synth::report_error "Cannot instantiate ethernet device $name\n \
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Invalid entry \"$use\" in target definition file $synth::target_definition\n \
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MAC address should be of the form xx:xx:xx:xx:xx:xx, all hexadecimal digits.\n"
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return ""
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}
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}
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}
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} else {
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synth::report_error "Cannot instantiate ethernet device $name\n \
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Invalid entry \"$use\" in target definition file $synth::target_definition\n \
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Should be \"real <Linux ethernet device>\" or \"ethertap \[<tap-device> \[<MAC address>\]\]\"\n"
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return ""
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}
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# Now spawn the rawether process. Its stdin and stdout are
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# pipes connected to ecosynth. Its stderr is redirected to
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# the current tty to avoid confusion between incoming ethernet
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# packets and diagnostics.
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if { [catch { set rawether [open "|$ethernet::rawether_executable $use 2>/dev/tty" w+] } message ] } {
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synth::report_error "Failed to spawn rawether process for device $name\n $message"
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return ""
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}
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# No translation on this pipe please.
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fconfigure $rawether -translation binary -encoding binary -buffering none
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# Now wait for the rawether device to initialize. It should send back a single
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# byte, '0' for failure or '1' for success. Failure is followed by a text
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# message which should be reported. Success is followed by a six-byte MAC
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# address.
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set reply [read $rawether 1]
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if { "" == $reply } {
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synth::report_error "rawether process for device $name exited unexpectedly.\n"
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catch { close $rawether }
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return ""
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}
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if { "1" != $reply } {
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set message [read $rawether 1024]
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synth::report_error "rawether process was unable to initialize eCos device $name ($use)\n $message"
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catch { close $rawether }
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return ""
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}
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set reply [read $rawether 7]
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if { [string length $reply] != 7 } {
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synth::report_error "rawether process for eCos device $name ($use) failed to provide the initialization response.\n"
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catch { close $rawether }
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return ""
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}
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set mac [string range $reply 0 5]
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set multi [string index $reply 6]
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# Finally allocate an interrupt vector
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set vector [synth::interrupt_allocate $name]
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if { -1 == $vector } {
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# No more interrupts left. An error will have been reported already.
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catch { close $rawether }
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return ""
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}
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# The device is up and running. Fill in the array entries
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lappend ethernet::ids $id
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set ethernet::data($id,alive) 1
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set ethernet::data($id,name) $name
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set ethernet::data($id,rawether) $rawether
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set ethernet::data($id,packets) [list]
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set ethernet::data($id,packet_count) 0
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set ethernet::data($id,up) 0
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set ethernet::data($id,interrupt_vector) $vector
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set ethernet::data($id,MAC) $mac
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set ethernet::data($id,multi) $multi
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# Set up the event handler to handle incoming packets. There should
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# not be any until the interface is brought up
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fileevent $rawether readable [list ethernet::handle_packet $name $id $rawether]
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# Finally return the request handler. The eCos device driver will
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# automatically get back an ack.
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return ethernet::handle_request
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}
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# ----------------------------------------------------------------------------
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# eCos has sent a request to a device instance. Most of these requests should
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# just be forwarded to rawether. Some care has to be taken to preserve
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# packet boundaries and avoid confusion. It is also necessary to worry
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# about the rawether process exiting unexpectedly, which may cause
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# puts operations to raise an error (subject to buffering).
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#
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# Note: it might actually be more efficient to always send a header plus
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# 1514 bytes of data, reducing the number of system calls at the cost of
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# some extra data copying, but with at least two process switches per
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# ethernet transfer efficiency is not going to be particularly good
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# anyway.
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proc send_rawether { id packet } {
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if { $ethernet::data($id,alive) } {
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set chan $ethernet::data($id,rawether)
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if { [catch { puts -nonewline $chan $packet } ] } {
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set ethernet::data($id,alive) 0
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# No further action is needed here, instead the read handler
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# will detect EOF and report abnormal termination.
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}
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}
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}
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proc handle_request { id reqcode arg1 arg2 reqdata reqlen reply_len } {
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if { $reqcode == $ethernet::SYNTH_ETH_TX } {
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# Transmit a single packet. To preserve packet boundaries
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# this involves a four-byte header containing opcode and
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# size, followed by the data itself.
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set header [binary format "ccs" $reqcode 0 [string length $reqdata]]
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ethernet::send_rawether $id $header
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ethernet::send_rawether $id $reqdata
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if { $ethernet::logging_enabled } {
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ethernet::log_packet $ethernet::data($id,name) "tx" $reqdata
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}
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synth::hook_call "ethernet_tx" $ethernet::data($id,name) $reqdata
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} elseif { $reqcode == $ethernet::SYNTH_ETH_RX } {
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# Return a single packet to eCos, plus a count of the number
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# of remaining packets. All packets are buffered here, not
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# in rawether.
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if { $ethernet::data($id,packet_count) == 0 } {
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synth::send_reply 0 0 ""
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} else {
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incr ethernet::data($id,packet_count) -1
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set packet [lindex $ethernet::data($id,packets) 0]
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set ethernet::data($id,packets) [lrange $ethernet::data($id,packets) 1 end]
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synth::send_reply $ethernet::data($id,packet_count) [string length $packet] $packet
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if { $ethernet::logging_enabled } {
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ethernet::log_packet $ethernet::data($id,name) "rx" $packet
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}
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synth::hook_call "ethernet_rx" $ethernet::data($id,name) $packet
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}
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|
|
} elseif { $reqcode == $ethernet::SYNTH_ETH_START } {
|
| 321 |
|
|
# Start the interface in either normal or promiscuous
|
| 322 |
|
|
# mode, depending on arg1. No reply is expected. Also
|
| 323 |
|
|
# mark the interface as up so that any packets transmitted
|
| 324 |
|
|
# by rawether will not be discarded
|
| 325 |
|
|
set ethernet::data($id,up) 1
|
| 326 |
|
|
set header [binary format "ccs" $reqcode $arg1 0]
|
| 327 |
|
|
ethernet::send_rawether $id $header
|
| 328 |
|
|
} elseif { $reqcode == $ethernet::SYNTH_ETH_STOP } {
|
| 329 |
|
|
# Stop the interface. All pending packets should be
|
| 330 |
|
|
# discarded and no new packets should be accepted.
|
| 331 |
|
|
# No reply is expected so just pass this on to rawether
|
| 332 |
|
|
set ethernet::data($id,up) 0
|
| 333 |
|
|
set ethernet::data($id,packets) [list]
|
| 334 |
|
|
set ethernet::data($id,packet_count) 0
|
| 335 |
|
|
set header [binary format "ccs" $reqcode 0 0]
|
| 336 |
|
|
ethernet::send_rawether $id $header
|
| 337 |
|
|
} elseif { $reqcode == $ethernet::SYNTH_ETH_GETPARAMS } {
|
| 338 |
|
|
# Retrieve the interrupt number, the MAC address,
|
| 339 |
|
|
# and the multicast flag for this interface. eCos should be
|
| 340 |
|
|
# expecting back 6 bytes of data for the MAC, plus an
|
| 341 |
|
|
# extra byte for the multi flag, and the interrupt
|
| 342 |
|
|
# number as the return code. This is all known locally.
|
| 343 |
|
|
set reply "$ethernet::data($id,MAC)$ethernet::data($id,multi)"
|
| 344 |
|
|
synth::send_reply $ethernet::data($id,interrupt_vector) 7 $reply
|
| 345 |
|
|
} elseif { $reqcode == $ethernet::SYNTH_ETH_MULTIALL } {
|
| 346 |
|
|
set header [binary format "ccs" $reqcode $arg1 0]
|
| 347 |
|
|
ethernet::send_rawether $id $header
|
| 348 |
|
|
} else {
|
| 349 |
|
|
synth::report_error "Received unexpected request $reqcode for ethernet device"
|
| 350 |
|
|
}
|
| 351 |
|
|
}
|
| 352 |
|
|
|
| 353 |
|
|
# ----------------------------------------------------------------------------
|
| 354 |
|
|
# Incoming data.
|
| 355 |
|
|
#
|
| 356 |
|
|
# The rawether process continually reads packets from the low-level device
|
| 357 |
|
|
# and tries to forward them on to this script, where they will be received
|
| 358 |
|
|
# by an event handler. The packet consists of a four-byte header containing
|
| 359 |
|
|
# the size, followed by the ethernet data itself. This ensures that
|
| 360 |
|
|
# packet boundaries are preserved. Incoming packets are buffered inside
|
| 361 |
|
|
# the auxiliary until eCos sends an RX request, and an interrupt is
|
| 362 |
|
|
# generated.
|
| 363 |
|
|
#
|
| 364 |
|
|
# If eCos stops accepting data or if it cannot process the ethernet packets
|
| 365 |
|
|
# quickly enough then the auxiliary could end up buffering an unbounded
|
| 366 |
|
|
# amount of data. That is a bad idea, so there is an upper bound on the
|
| 367 |
|
|
# number of buffered packets. Any excess packets get dropped.
|
| 368 |
|
|
#
|
| 369 |
|
|
# Error conditions or EOF indicate that rawether has terminated. This
|
| 370 |
|
|
# should not happen during normal operation. rawether should only exit
|
| 371 |
|
|
# because of an ecos_exit hook when the channel gets closed, and the
|
| 372 |
|
|
# event handler gets removed first.
|
| 373 |
|
|
#
|
| 374 |
|
|
# Incoming packets are logged when they are received by eCos, not when
|
| 375 |
|
|
# they are received from the rawether device. That gives a somewhat more
|
| 376 |
|
|
# accurate view of what is happening inside eCos - a packet stuck in
|
| 377 |
|
|
# a fifo has little impact.
|
| 378 |
|
|
proc _handle_packet_error { msg id } {
|
| 379 |
|
|
append msg " No further I/O will happen on this interface.\n"
|
| 380 |
|
|
synth::report_warning $msg
|
| 381 |
|
|
set ethernet::data($id,alive) 0
|
| 382 |
|
|
fileevent $ethernet::data($id,rawether) readable ""
|
| 383 |
|
|
catch { close $ethernet::data($id,rawether) }
|
| 384 |
|
|
}
|
| 385 |
|
|
|
| 386 |
|
|
proc handle_packet { name id chan } {
|
| 387 |
|
|
set header [read $chan 4]
|
| 388 |
|
|
if { 4 != [string length $header] } {
|
| 389 |
|
|
ethernet::_handle_packet_error "rawether process for $name has terminated unexpectedly.\n" $id
|
| 390 |
|
|
return
|
| 391 |
|
|
}
|
| 392 |
|
|
|
| 393 |
|
|
binary scan $header "ccs" code arg1 len
|
| 394 |
|
|
if { $ethernet::SYNTH_ETH_RX != $code } {
|
| 395 |
|
|
set msg "protocol mismatch from rawether process for $name\n"
|
| 396 |
|
|
append msg " Function code $code not recognised.\n"
|
| 397 |
|
|
ethernet::_handle_packet_error $msg $id
|
| 398 |
|
|
return
|
| 399 |
|
|
}
|
| 400 |
|
|
if { ($len < 14) || ($len > 1514) } {
|
| 401 |
|
|
set msg "protocol mismatch from rawether process for $name\n"
|
| 402 |
|
|
append msg " Invalid transfer length $len\n"
|
| 403 |
|
|
ethernet::_handle_packet_error $msg $id
|
| 404 |
|
|
return
|
| 405 |
|
|
}
|
| 406 |
|
|
|
| 407 |
|
|
set data [read $chan $len]
|
| 408 |
|
|
if { $len != [string length $data] } {
|
| 409 |
|
|
set msg "protocol mismatch from rawether process for $name\n"
|
| 410 |
|
|
append msg " Expected $len byte ethernet packet, received [string length $data] bytes\n"
|
| 411 |
|
|
ethernet::_handle_packet_error $msg $id
|
| 412 |
|
|
return
|
| 413 |
|
|
}
|
| 414 |
|
|
|
| 415 |
|
|
# The data has been received correctly. Should it be buffered?
|
| 416 |
|
|
if { !$ethernet::data($id,up) } {
|
| 417 |
|
|
return
|
| 418 |
|
|
}
|
| 419 |
|
|
if { $ethernet::data($id,packet_count) >= $ethernet::max_buffered_packets } {
|
| 420 |
|
|
return
|
| 421 |
|
|
}
|
| 422 |
|
|
|
| 423 |
|
|
# Store the packet, and inform eCos there is work to be done
|
| 424 |
|
|
lappend ethernet::data($id,packets) $data
|
| 425 |
|
|
incr ethernet::data($id,packet_count)
|
| 426 |
|
|
synth::interrupt_raise $ethernet::data($id,interrupt_vector)
|
| 427 |
|
|
|
| 428 |
|
|
}
|
| 429 |
|
|
|
| 430 |
|
|
# ----------------------------------------------------------------------------
|
| 431 |
|
|
# When eCos has exited, the rawether processes can and should be
|
| 432 |
|
|
# shut down immediately.
|
| 433 |
|
|
proc ecos_exited { arg_list } {
|
| 434 |
|
|
foreach id $ethernet::ids {
|
| 435 |
|
|
if { $ethernet::data($id,alive) } {
|
| 436 |
|
|
set ethernet::data($id,alive) 0
|
| 437 |
|
|
fileevent $ethernet::data($id,rawether) readable ""
|
| 438 |
|
|
catch { close $ethernet::data($id,rawether) }
|
| 439 |
|
|
}
|
| 440 |
|
|
}
|
| 441 |
|
|
}
|
| 442 |
|
|
synth::hook_add "ecos_exit" ethernet::ecos_exited
|
| 443 |
|
|
|
| 444 |
|
|
# ----------------------------------------------------------------------------
|
| 445 |
|
|
# Read in various data files for use by the filters
|
| 446 |
|
|
#
|
| 447 |
|
|
# Other possible sources of information include arp, ypcat, and
|
| 448 |
|
|
# dns. Those are avoided for now because they involve running
|
| 449 |
|
|
# additional processes that might hang for a while. Also arp
|
| 450 |
|
|
# would only give useful information for very recently accessed
|
| 451 |
|
|
# machines, NIS might not be running, and dns could involve an
|
| 452 |
|
|
# expensive lookup while the system is running .
|
| 453 |
|
|
|
| 454 |
|
|
array set services [list]
|
| 455 |
|
|
array set hosts [list]
|
| 456 |
|
|
array set protocols [list]
|
| 457 |
|
|
|
| 458 |
|
|
proc read_services { } {
|
| 459 |
|
|
catch {
|
| 460 |
|
|
set fd [open "/etc/services" "r"]
|
| 461 |
|
|
while { -1 != [gets $fd line] } {
|
| 462 |
|
|
set junk ""
|
| 463 |
|
|
set name ""
|
| 464 |
|
|
set number ""
|
| 465 |
|
|
set protocol ""
|
| 466 |
|
|
if { [regexp -- {^([-a-zA-Z0-9_]+)\s*([0-9]+)/((?:tcp)|(?:udp)).*$} $line junk name number protocol] } {
|
| 467 |
|
|
set ethernet::services($number,$protocol) $name
|
| 468 |
|
|
}
|
| 469 |
|
|
}
|
| 470 |
|
|
close $fd
|
| 471 |
|
|
}
|
| 472 |
|
|
}
|
| 473 |
|
|
|
| 474 |
|
|
proc read_protocols { } {
|
| 475 |
|
|
catch {
|
| 476 |
|
|
set fd [open "/etc/protocols" "r"]
|
| 477 |
|
|
while { -1 != [gets $fd line] } {
|
| 478 |
|
|
set junk ""
|
| 479 |
|
|
set name ""
|
| 480 |
|
|
set number ""
|
| 481 |
|
|
if { [regexp -- {^([-a-zA-Z0-9_]+)\s*([0-9]+)\s.*} $line junk name number] } {
|
| 482 |
|
|
set ethernet::protocols($number) $name
|
| 483 |
|
|
}
|
| 484 |
|
|
}
|
| 485 |
|
|
close $fd
|
| 486 |
|
|
}
|
| 487 |
|
|
}
|
| 488 |
|
|
|
| 489 |
|
|
proc read_hosts { } {
|
| 490 |
|
|
catch {
|
| 491 |
|
|
set fd [open "/etc/hosts" "r"]
|
| 492 |
|
|
while { -1 != [gets $fd line] } {
|
| 493 |
|
|
set junk ""
|
| 494 |
|
|
set name ""
|
| 495 |
|
|
set number ""
|
| 496 |
|
|
|
| 497 |
|
|
# Deliberately ignore parts of the name after the first .
|
| 498 |
|
|
if { [regexp -- {^([0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3})\s*([a-zA-Z0-9]+)(\.|\s|$)} $line junk number name] } {
|
| 499 |
|
|
# The number should be naturalized if it is going to match reliably
|
| 500 |
|
|
scan $line "%d.%d.%d.%d" a b c d
|
| 501 |
|
|
set index [expr (($a & 0x0FF) << 24) | (($b & 0x0FF) << 16) | (($c & 0x0FF) << 8) | ($d & 0x0FF)]
|
| 502 |
|
|
set ethernet::hosts($index) $name
|
| 503 |
|
|
}
|
| 504 |
|
|
}
|
| 505 |
|
|
close $fd
|
| 506 |
|
|
}
|
| 507 |
|
|
}
|
| 508 |
|
|
|
| 509 |
|
|
# ----------------------------------------------------------------------------
|
| 510 |
|
|
# Filtering support. This is only really used when running in GUI mode.
|
| 511 |
|
|
# However all the relevant options are still extracted and validated,
|
| 512 |
|
|
# to avoid warnings about unrecognised options.
|
| 513 |
|
|
|
| 514 |
|
|
variable logging_enabled 0
|
| 515 |
|
|
variable max_show 64
|
| 516 |
|
|
|
| 517 |
|
|
# Construct a string for the data, either all of it or up to max_show bytes.
|
| 518 |
|
|
# This is just hex in chunks of four bytes.
|
| 519 |
|
|
proc format_hex_data { data } {
|
| 520 |
|
|
set result ""
|
| 521 |
|
|
|
| 522 |
|
|
set len [string length $data]
|
| 523 |
|
|
if { $len > $ethernet::max_show } {
|
| 524 |
|
|
set len $ethernet::max_show
|
| 525 |
|
|
}
|
| 526 |
|
|
binary scan $data "H[expr 2 * $len]" hex
|
| 527 |
|
|
for { set i 0 } { $i < $len } { incr i 4 } {
|
| 528 |
|
|
append result "[string range $hex [expr $i * 2] [expr ($i * 2) + 7]] "
|
| 529 |
|
|
}
|
| 530 |
|
|
set result [string trimright $result]
|
| 531 |
|
|
return $result
|
| 532 |
|
|
}
|
| 533 |
|
|
|
| 534 |
|
|
# Given an IPv4 network address, turn it into a.b.c.d and the
|
| 535 |
|
|
# host name as well (if known). The argument should be a 32-bit
|
| 536 |
|
|
# integer.
|
| 537 |
|
|
proc inet_ipv4_ntoa { number } {
|
| 538 |
|
|
set result [format "%d.%d.%d.%d" [expr ($number >> 24) & 0x0FF] [expr ($number >> 16) & 0x0FF] \
|
| 539 |
|
|
[expr ($number >> 8) & 0x0FF] [expr $number & 0x0FF]]
|
| 540 |
|
|
if { [info exists ethernet::hosts($number) ] } {
|
| 541 |
|
|
append result "($ethernet::hosts($number))"
|
| 542 |
|
|
}
|
| 543 |
|
|
return $result
|
| 544 |
|
|
}
|
| 545 |
|
|
|
| 546 |
|
|
# Given an ipv4 address encapsulated in an IPv6 address, do the necessary
|
| 547 |
|
|
# conversion. We have something like 123:4567, we want a.b.c.d plus
|
| 548 |
|
|
# a host address.
|
| 549 |
|
|
proc inet_ipv4_in_ipv6_ntoa { top bottom } {
|
| 550 |
|
|
if { "" == $top } {
|
| 551 |
|
|
set top 0
|
| 552 |
|
|
}
|
| 553 |
|
|
if { "" == $bottom } {
|
| 554 |
|
|
set bottom 0
|
| 555 |
|
|
}
|
| 556 |
|
|
set top "0x$top"
|
| 557 |
|
|
set bottom "0x$bottom"
|
| 558 |
|
|
|
| 559 |
|
|
set ipv4 [expr ($top << 16) | $bottom]
|
| 560 |
|
|
return inet_ipv4_ntoa $ipv4
|
| 561 |
|
|
}
|
| 562 |
|
|
|
| 563 |
|
|
# Ditto for IPv6. The argument should be a 32-digit hexadecimal string.
|
| 564 |
|
|
# For now there is no simple way of mapping these onto host names,
|
| 565 |
|
|
# unless the address is an IPv4-mapped or compatible one, or one of
|
| 566 |
|
|
# special cases such as loopback.
|
| 567 |
|
|
proc inet_ipv6_ntoa { number } {
|
| 568 |
|
|
# We have something like 12345678abcdef. Start by inserting the appropriate
|
| 569 |
|
|
# colons.
|
| 570 |
|
|
set result [format "%s:%s:%s:%s:%s:%s:%s:%s" [string range $number 0 3] [string range $number 4 7] \
|
| 571 |
|
|
[string range $number 8 11] [string range $number 12 15] [string range $number 16 19] \
|
| 572 |
|
|
[string range $number 20 23] [string range $number 24 27] [string range $number 28 31]]
|
| 573 |
|
|
# Now eliminate unwanted 0's at the start of each range.
|
| 574 |
|
|
regsub {^0+} $result {} result
|
| 575 |
|
|
regsub -all {:0+} $result {:} result
|
| 576 |
|
|
|
| 577 |
|
|
# If we have ended up with sequences of colons, abbreviate
|
| 578 |
|
|
# them into pairs.
|
| 579 |
|
|
regsub -all {::+} $result {::} result
|
| 580 |
|
|
|
| 581 |
|
|
# There are a couple of special addresses
|
| 582 |
|
|
if { "::1" == $result } {
|
| 583 |
|
|
return "::1(loopback)"
|
| 584 |
|
|
} elseif { "::" == $result } {
|
| 585 |
|
|
return "::(IN6ADDR_ANY)"
|
| 586 |
|
|
}
|
| 587 |
|
|
|
| 588 |
|
|
# Look for IPv4-mapped addresses.
|
| 589 |
|
|
set junk ""
|
| 590 |
|
|
set ipv4_1 ""
|
| 591 |
|
|
set ipv4_2 ""
|
| 592 |
|
|
if { [regexp -nocase -- {::ffff:([0-9a-f]{0,3}):([0-9a-f]{0,3})$} $result junk ipv4_1 ipv4_2] } {
|
| 593 |
|
|
set result [inet_ipv4_in_ipv6_nto $ipv4_1 $ipv4_2]
|
| 594 |
|
|
return "::FFFF:$result"
|
| 595 |
|
|
} elseif { [regexp -nocase -- {::([0-9a-f]{0,3}):([0-9a-f]{0,3})$} $result junk ipv4_1 ipv4_2] } {
|
| 596 |
|
|
set result [inet_ipv4_in_ipv6_nto $ipv4_1 $ipv4_2]
|
| 597 |
|
|
return "::$result"
|
| 598 |
|
|
} else {
|
| 599 |
|
|
# Could still be aggregatable global unicast, link-local, site-local or multicast.
|
| 600 |
|
|
# But not decoded further for now.
|
| 601 |
|
|
return $result
|
| 602 |
|
|
}
|
| 603 |
|
|
}
|
| 604 |
|
|
|
| 605 |
|
|
proc log_packet { device direction packet } {
|
| 606 |
|
|
if { [string length $packet] < 14 } {
|
| 607 |
|
|
return
|
| 608 |
|
|
}
|
| 609 |
|
|
binary scan $packet {H2H2H2H2H2H2 H2H2H2H2H2H2 S} dest5 dest4 dest3 dest2 dest1 dest0 src5 src4 src3 src2 src1 src0 eth_protocol
|
| 610 |
|
|
set packet [string range $packet 14 end]
|
| 611 |
|
|
|
| 612 |
|
|
set ether_msg "$device $direction: [string length $packet] bytes, "
|
| 613 |
|
|
append ether_msg [format ">%s:%s:%s:%s:%s:%s <%s:%s:%s:%s:%s:%s" $dest5 $dest4 $dest3 $dest2 $dest1 $dest0 $src5 $src4 $src3 $src2 $src1 $src0]
|
| 614 |
|
|
set eth_protocol [expr $eth_protocol & 0x0FFFF]
|
| 615 |
|
|
if { $eth_protocol <= 1536 } {
|
| 616 |
|
|
append ether_msg " 802.3 "
|
| 617 |
|
|
if { [string length $packet] < 8 } {
|
| 618 |
|
|
return
|
| 619 |
|
|
}
|
| 620 |
|
|
binary scan $packet {a6 S} junk eth_protocol
|
| 621 |
|
|
set packet [string range $packet 8 end]
|
| 622 |
|
|
}
|
| 623 |
|
|
append ether_msg [format " %04x" $eth_protocol]
|
| 624 |
|
|
if { $eth_protocol == 0x0800 } {
|
| 625 |
|
|
append ether_msg "(ip)"
|
| 626 |
|
|
} elseif { $eth_protocol == 0x00806 } {
|
| 627 |
|
|
append ether_msg "(arp)"
|
| 628 |
|
|
} elseif { $eth_protocol == 0x08035 } {
|
| 629 |
|
|
append ether_msg "(rarp)"
|
| 630 |
|
|
}
|
| 631 |
|
|
append ether_msg " [ethernet::format_hex_data $packet]\n"
|
| 632 |
|
|
synth::output $ether_msg "eth_ether"
|
| 633 |
|
|
|
| 634 |
|
|
if { 0x0806 == $eth_protocol } {
|
| 635 |
|
|
# An ARP request. This should always be 28 bytes.
|
| 636 |
|
|
if { [string length $packet] < 28 } {
|
| 637 |
|
|
return
|
| 638 |
|
|
}
|
| 639 |
|
|
binary scan $packet {SSccS H2H2H2H2H2H2 I H2H2H2H2H2H2 I} hard_type prot_type hard_size prot_size op \
|
| 640 |
|
|
sender5 sender4 sender3 sender2 sender1 sender0 sender_ip \
|
| 641 |
|
|
target5 target4 target3 target2 target1 target0 target_ip
|
| 642 |
|
|
set hard_type [expr $hard_type & 0x0FFFF]
|
| 643 |
|
|
set prot_type [expr $prot_type & 0x0FFFF]
|
| 644 |
|
|
set hard_size [expr $hard_size & 0x0FF]
|
| 645 |
|
|
set prot_size [expr $prot_size & 0x0FF]
|
| 646 |
|
|
set op [expr $op & 0x0FFFF]
|
| 647 |
|
|
set sender_ip [expr $sender_ip & 0x0FFFFFFFF]
|
| 648 |
|
|
set target_ip [expr $target_ip & 0x0FFFFFFFF]
|
| 649 |
|
|
|
| 650 |
|
|
set arp_msg "$device $direction: ARP "
|
| 651 |
|
|
if { $op == 1 } {
|
| 652 |
|
|
append arp_msg "request "
|
| 653 |
|
|
} elseif { $op == 2 } {
|
| 654 |
|
|
append arp_msg "reply "
|
| 655 |
|
|
} else {
|
| 656 |
|
|
append_arp_msg "<unknown opcode> "
|
| 657 |
|
|
}
|
| 658 |
|
|
if { $hard_type != 1 } {
|
| 659 |
|
|
append arp_msg "(unexpected hard_type field $hard_type, should be 1) "
|
| 660 |
|
|
}
|
| 661 |
|
|
if { $prot_type != 0x0800 } {
|
| 662 |
|
|
append arp_msg "(unexpected prot_type field $prot_type, should be 0x0800) "
|
| 663 |
|
|
}
|
| 664 |
|
|
if { $hard_size != 6 } {
|
| 665 |
|
|
append arp_msg "(unexpected hard_size field $hard_size, should be 6) "
|
| 666 |
|
|
}
|
| 667 |
|
|
if { $prot_size != 4 } {
|
| 668 |
|
|
append arp_msg "(unexpected prot_size field $prot_size, should be 4) "
|
| 669 |
|
|
}
|
| 670 |
|
|
append arp_msg [format ", sender %s:%s:%s:%s:%s:%s " $sender5 $sender4 $sender3 $sender2 $sender1 $sender0]
|
| 671 |
|
|
append arp_msg [ethernet::inet_ipv4_ntoa $sender_ip]
|
| 672 |
|
|
append arp_msg [format ", target %s:%s:%s:%s:%s:%s " $target5 $target4 $target3 $target2 $target1 $target0]
|
| 673 |
|
|
append arp_msg [ethernet::inet_ipv4_ntoa $target_ip]
|
| 674 |
|
|
append arp_msg "\n"
|
| 675 |
|
|
|
| 676 |
|
|
synth::output $arp_msg "eth_arp"
|
| 677 |
|
|
return
|
| 678 |
|
|
}
|
| 679 |
|
|
|
| 680 |
|
|
if { 0x0800 != $eth_protocol } {
|
| 681 |
|
|
return
|
| 682 |
|
|
}
|
| 683 |
|
|
|
| 684 |
|
|
# We have an IP packet. Is this IPv4 or IPv6? The first byte contains
|
| 685 |
|
|
# the version and the overall length of the IP header in 32-bit words
|
| 686 |
|
|
if { [string length $packet] < 20 } {
|
| 687 |
|
|
return
|
| 688 |
|
|
}
|
| 689 |
|
|
binary scan $packet {c} tmp
|
| 690 |
|
|
set ip_version [expr ($tmp >> 4) & 0x0F]
|
| 691 |
|
|
set ip_hdrsize [expr $tmp & 0x0F]
|
| 692 |
|
|
if { 4 == $ip_version } {
|
| 693 |
|
|
binary scan $packet {ccSSSccSII} tmp tos len id frag ttl ip_protocol checksum source_ip dest_ip
|
| 694 |
|
|
set ipv4_msg "$device $direction: IPv4"
|
| 695 |
|
|
if { 0 != $tos } {
|
| 696 |
|
|
append ipv4_msg [format " tos %02x," [expr $tos & 0x0FF]]
|
| 697 |
|
|
}
|
| 698 |
|
|
append ipv4_msg [format " len %d, id %d," [expr $len & 0x0FFFF] [expr $id & 0x0FFFF]]
|
| 699 |
|
|
if { 0 != $frag } {
|
| 700 |
|
|
append ipv4_msg [format " frag %u" [expr 8 * ($frag & 0x01FFF)]]
|
| 701 |
|
|
if { 0 != ($frag & 0x04000) } {
|
| 702 |
|
|
append ipv4_msg " DF"
|
| 703 |
|
|
}
|
| 704 |
|
|
if { 0 != ($frag & 0x02000) } {
|
| 705 |
|
|
append ipv4_msg " MF"
|
| 706 |
|
|
}
|
| 707 |
|
|
append ipv4_msg ","
|
| 708 |
|
|
}
|
| 709 |
|
|
append ipv4_msg [format " ttl %d," $ttl]
|
| 710 |
|
|
set ip_protocol [expr $ip_protocol & 0x0FF]
|
| 711 |
|
|
if { [info exists ethernet::protocols($ip_protocol)] } {
|
| 712 |
|
|
append ipv4_msg " $ethernet::protocols($ip_protocol),"
|
| 713 |
|
|
} else {
|
| 714 |
|
|
append ipv4_msg [format " protocol %d" $ip_protocol]
|
| 715 |
|
|
}
|
| 716 |
|
|
|
| 717 |
|
|
set source_name [ethernet::inet_ipv4_ntoa $source_ip]
|
| 718 |
|
|
set dest_name [ethernet::inet_ipv4_ntoa $dest_ip]
|
| 719 |
|
|
append ipv4_msg " >${dest_name}, <${source_name}\n"
|
| 720 |
|
|
|
| 721 |
|
|
synth::output $ipv4_msg "eth_ipv4"
|
| 722 |
|
|
|
| 723 |
|
|
# If this packet is a fragment other than the first, do not try to decode
|
| 724 |
|
|
# subsequent packets. The header information will not be present.
|
| 725 |
|
|
if { 0 != ($frag & 0x01FFF)} {
|
| 726 |
|
|
return
|
| 727 |
|
|
}
|
| 728 |
|
|
set packet [string range $packet [expr 4 * $ip_hdrsize] end]
|
| 729 |
|
|
|
| 730 |
|
|
} elseif { 6 == $ip_version } {
|
| 731 |
|
|
if { [string length $packet] < 40 } {
|
| 732 |
|
|
return
|
| 733 |
|
|
}
|
| 734 |
|
|
binary scan $packet {ISccH16H16} flow payload_length next_header hop_limit source_ip dest_ip
|
| 735 |
|
|
set ipv6_msg "$device $direction: IPv6"
|
| 736 |
|
|
set prio [expr ($flow & 0x0F000000) >> 24]
|
| 737 |
|
|
set flow [expr $flow & 0x00FFFFFF]
|
| 738 |
|
|
if { 0 != $flow } {
|
| 739 |
|
|
append ipv6_msg [format " flow %04x prio %x," $flow $prio]
|
| 740 |
|
|
}
|
| 741 |
|
|
append ipv6_msg " payload [expr $payload bytes & 0x0FFFF],"
|
| 742 |
|
|
append ipv6_msg " hop limit [expr $hop_limit & 0x0FF],"
|
| 743 |
|
|
set next_header [expr $next_header & 0x0FF]
|
| 744 |
|
|
if { [info exists ethernet::protocols($next_header)] } {
|
| 745 |
|
|
append ipv6_msg " $ethernet::protocols($next_header),"
|
| 746 |
|
|
} else {
|
| 747 |
|
|
append ipv6_msg [format " protocol %d," $next_header]
|
| 748 |
|
|
}
|
| 749 |
|
|
|
| 750 |
|
|
set source_name [ethernet::inet_ipv6_ntoa $source_ip]
|
| 751 |
|
|
set dest_name [ethernet::inet_ipv6_ntoa $dest_ip]
|
| 752 |
|
|
append ipv6_msg " >${dest_name}, <${source_name}\n"
|
| 753 |
|
|
|
| 754 |
|
|
synth::output $ipv6_msg "eth_ipv6"
|
| 755 |
|
|
|
| 756 |
|
|
set packet [string range $packet 40 end]
|
| 757 |
|
|
|
| 758 |
|
|
} else {
|
| 759 |
|
|
synth::output "$device $direction: unknown IP version $ip_version\n" "eth_ipv4"
|
| 760 |
|
|
return
|
| 761 |
|
|
}
|
| 762 |
|
|
|
| 763 |
|
|
|
| 764 |
|
|
# Now for some known protocols, icmp, tcp, udp and icmpv6
|
| 765 |
|
|
# Possible ipv6-frag should be handled here as well. The
|
| 766 |
|
|
# fragment header should be followed by another header such
|
| 767 |
|
|
# as tcp or udp.
|
| 768 |
|
|
if { 1 == $ip_protocol } {
|
| 769 |
|
|
# ipv4 ICMP
|
| 770 |
|
|
if { [string length $packet] < 4 } {
|
| 771 |
|
|
return
|
| 772 |
|
|
}
|
| 773 |
|
|
binary scan $packet {ccS} code type checksum
|
| 774 |
|
|
|
| 775 |
|
|
set icmpv4_msg "$device $direction: ICMPv4 "
|
| 776 |
|
|
set error 0
|
| 777 |
|
|
set data 0
|
| 778 |
|
|
switch -- $code {
|
| 779 |
|
|
|
| 780 |
|
|
append icmpv4_msg "ping reply"
|
| 781 |
|
|
if { [string length $packet] >= 8 } {
|
| 782 |
|
|
# The id and seq are in the sender's format, not network format.
|
| 783 |
|
|
# We have to assume either little or bigendian, so go for the former
|
| 784 |
|
|
binary scan $packet {iss} junk id seq
|
| 785 |
|
|
append icmpv4_msg [format " id %u, seq %u" [expr $id & 0x0FFFF] [expr $seq & 0x0FFFF]]
|
| 786 |
|
|
set data 1
|
| 787 |
|
|
set packet [string range $packet 8 end]
|
| 788 |
|
|
}
|
| 789 |
|
|
}
|
| 790 |
|
|
3 {
|
| 791 |
|
|
append icmpv4_msg "unreachable/"
|
| 792 |
|
|
switch -- $type {
|
| 793 |
|
|
|
| 794 |
|
|
1 { append icmpv4_msg "host" }
|
| 795 |
|
|
2 { append icmpv4_msg "protocol" }
|
| 796 |
|
|
3 { append icmpv4_msg "port" }
|
| 797 |
|
|
4 { append icmpv4_msg "frag needed but don't frag set" }
|
| 798 |
|
|
5 { append icmpv4_msg "source route failed" }
|
| 799 |
|
|
6 { append icmpv4_msg "destination network unknown" }
|
| 800 |
|
|
7 { append icmpv4_msg "destination host unknown" }
|
| 801 |
|
|
8 { append icmpv4_msg "source host isolated" }
|
| 802 |
|
|
9 { append icmpv4_msg "destination network prohibited" }
|
| 803 |
|
|
10 { append icmpv4_msg "destination host prohibited" }
|
| 804 |
|
|
11 { append icmpv4_msg "network for TOS" }
|
| 805 |
|
|
12 { append icmpv4_msg "host for TOS" }
|
| 806 |
|
|
13 { append icmpv4_msg "communication prohibited" }
|
| 807 |
|
|
14 { append icmpv4_msg "host precedence violation" }
|
| 808 |
|
|
15 { append icmpv4_msg "precedence cutoff" }
|
| 809 |
|
|
default { append icmpv4_msg "unknown" }
|
| 810 |
|
|
}
|
| 811 |
|
|
set error 1
|
| 812 |
|
|
}
|
| 813 |
|
|
4 {
|
| 814 |
|
|
append icmpv4_msg "source quench"
|
| 815 |
|
|
set error 1
|
| 816 |
|
|
}
|
| 817 |
|
|
5 {
|
| 818 |
|
|
append icmpv4_msg "redirect/"
|
| 819 |
|
|
switch -- $type {
|
| 820 |
|
|
|
| 821 |
|
|
1 { append icmpv4_msg "host" }
|
| 822 |
|
|
2 { append icmpv4_msg "tos & network" }
|
| 823 |
|
|
3 { append icmpv4_msg "tos & host" }
|
| 824 |
|
|
default { append icmpv4_msg "unknown" }
|
| 825 |
|
|
}
|
| 826 |
|
|
set error 1
|
| 827 |
|
|
}
|
| 828 |
|
|
8 {
|
| 829 |
|
|
append icmpv4_msg "ping request"
|
| 830 |
|
|
if { [string length $packet] >= 8 } {
|
| 831 |
|
|
binary scan $packet {iss} junk id seq
|
| 832 |
|
|
append icmpv4_msg [format " id %u, seq %u" [expr $id & 0x0FFFF] [expr $seq & 0x0FFFF]]
|
| 833 |
|
|
set data 1
|
| 834 |
|
|
set packet [string range $packet 8 end]
|
| 835 |
|
|
}
|
| 836 |
|
|
}
|
| 837 |
|
|
9 {
|
| 838 |
|
|
append icmpv4_msg "router advertisement"
|
| 839 |
|
|
}
|
| 840 |
|
|
10 {
|
| 841 |
|
|
append icmpv4_msg "router solicitation"
|
| 842 |
|
|
}
|
| 843 |
|
|
11 {
|
| 844 |
|
|
append icmpv4_msg "time exceeded/"
|
| 845 |
|
|
switch -- $type {
|
| 846 |
|
|
|
| 847 |
|
|
1 { append icmpv4_msg "reassembly" }
|
| 848 |
|
|
default { append icmpv4_msg "unknown" }
|
| 849 |
|
|
}
|
| 850 |
|
|
set error 1
|
| 851 |
|
|
}
|
| 852 |
|
|
12 {
|
| 853 |
|
|
append icmpv4_msg "parameter problem/"
|
| 854 |
|
|
switch -- $type {
|
| 855 |
|
|
|
| 856 |
|
|
1 { append icmpv4_msg "required option missing" }
|
| 857 |
|
|
default { append icmpv4_msg "unknown" }
|
| 858 |
|
|
}
|
| 859 |
|
|
set error 1
|
| 860 |
|
|
}
|
| 861 |
|
|
13 {
|
| 862 |
|
|
append icmpv4_msg "timestamp request"
|
| 863 |
|
|
}
|
| 864 |
|
|
14 {
|
| 865 |
|
|
append icmpv4_msg "timestamp reply"
|
| 866 |
|
|
}
|
| 867 |
|
|
15 {
|
| 868 |
|
|
append icmpv4_msg "information request"
|
| 869 |
|
|
}
|
| 870 |
|
|
16 {
|
| 871 |
|
|
append icmpv4_msg "information reply"
|
| 872 |
|
|
}
|
| 873 |
|
|
17 {
|
| 874 |
|
|
append icmpv4_msg "address mask request"
|
| 875 |
|
|
}
|
| 876 |
|
|
18 {
|
| 877 |
|
|
append icmpv4_msg "address mask reply"
|
| 878 |
|
|
}
|
| 879 |
|
|
default {
|
| 880 |
|
|
append icmpv4_msg "unknown"
|
| 881 |
|
|
}
|
| 882 |
|
|
}
|
| 883 |
|
|
if { $error && ([string length $packet] >= 36) } {
|
| 884 |
|
|
# The ICMP message contains an IP header and hopefully the TCP or UDP ports as well
|
| 885 |
|
|
# Only deal with the simple cases.
|
| 886 |
|
|
binary scan $packet {iiccSiccSIISS} icmp_junk1 icmp_junk2 ip_lenver ip_junk1 ip_junk2 ip_junk3 ip_junk4 ip_protocol ip_junk5 \
|
| 887 |
|
|
ip_source ip_dest ip_source_port ip_dest_port
|
| 888 |
|
|
if { (5 == ($ip_lenver & 0x0F)) && ((6 == $ip_protocol) || (17 == $ip_protocol)) } {
|
| 889 |
|
|
if { 6 == $ip_protocol } {
|
| 890 |
|
|
append icmpv4_msg ", tcp"
|
| 891 |
|
|
} else {
|
| 892 |
|
|
append icmpv4_msg ", udp"
|
| 893 |
|
|
}
|
| 894 |
|
|
append icmpv4_msg " >[ethernet::inet_ipv4_ntoa $ip_dest]:$ip_dest_port <[ethernet::inet_ipv4_ntoa $ip_source]:$ip_source_port"
|
| 895 |
|
|
}
|
| 896 |
|
|
}
|
| 897 |
|
|
|
| 898 |
|
|
append icmpv4_msg "\n"
|
| 899 |
|
|
synth::output $icmpv4_msg "eth_icmpv4"
|
| 900 |
|
|
|
| 901 |
|
|
# Only some of the requests contain additional data that should be displayed
|
| 902 |
|
|
if { !$data } {
|
| 903 |
|
|
return
|
| 904 |
|
|
}
|
| 905 |
|
|
|
| 906 |
|
|
} elseif { 58 == $ip_protocol } {
|
| 907 |
|
|
# ipv6 ICMP
|
| 908 |
|
|
if { [string length $packet] < 4 } {
|
| 909 |
|
|
return
|
| 910 |
|
|
}
|
| 911 |
|
|
binary scan $packet {ccS} code type checksum
|
| 912 |
|
|
|
| 913 |
|
|
set icmpv6_msg "$device $direction: ICMPv6 "
|
| 914 |
|
|
set error 0
|
| 915 |
|
|
set data 0
|
| 916 |
|
|
switch -- $code {
|
| 917 |
|
|
1 {
|
| 918 |
|
|
append icmpv6_msg "unreachable/"
|
| 919 |
|
|
switch -- $type {
|
| 920 |
|
|
|
| 921 |
|
|
1 { append icmpv6_msg "prohibited" }
|
| 922 |
|
|
2 { append icmpv6_msg "not a neighbour" }
|
| 923 |
|
|
3 { append icmpv6_msg "any other reason" }
|
| 924 |
|
|
4 { append icmpv6_msg "UDP port unreachable" }
|
| 925 |
|
|
default { append icmpv6_msg "unknown" }
|
| 926 |
|
|
}
|
| 927 |
|
|
set error 1
|
| 928 |
|
|
}
|
| 929 |
|
|
2 {
|
| 930 |
|
|
append icmpv6_msg "packet too big"
|
| 931 |
|
|
set error 1
|
| 932 |
|
|
}
|
| 933 |
|
|
3 {
|
| 934 |
|
|
append icmpv6_msg "time exceeded/"
|
| 935 |
|
|
switch -- $type {
|
| 936 |
|
|
|
| 937 |
|
|
1 { append icmpv6_msg "fragment reassembly" }
|
| 938 |
|
|
default { append icmpv6_msg "unknown" }
|
| 939 |
|
|
}
|
| 940 |
|
|
set error 1
|
| 941 |
|
|
}
|
| 942 |
|
|
4 {
|
| 943 |
|
|
append icmpv6_msg "parameter problem"
|
| 944 |
|
|
switch -- $type {
|
| 945 |
|
|
|
| 946 |
|
|
1 { append icmpv6_msg "unrecognized next header" }
|
| 947 |
|
|
2 { append icmpv6_msg "unrecognized option" }
|
| 948 |
|
|
default { append icmpv6_msg "unknown" }
|
| 949 |
|
|
}
|
| 950 |
|
|
set error 1
|
| 951 |
|
|
}
|
| 952 |
|
|
128 {
|
| 953 |
|
|
append icmpv6_msg "ping request"
|
| 954 |
|
|
# FIXME: is this the same format as for icmpv4?
|
| 955 |
|
|
}
|
| 956 |
|
|
129 {
|
| 957 |
|
|
append icmpv6_msg "ping reply"
|
| 958 |
|
|
# FIXME: is this the same format as for icmpv4?
|
| 959 |
|
|
}
|
| 960 |
|
|
130 {
|
| 961 |
|
|
append icmpv6_msg "group membership query"
|
| 962 |
|
|
}
|
| 963 |
|
|
131 {
|
| 964 |
|
|
append icmpv6_msg "group membership report"
|
| 965 |
|
|
}
|
| 966 |
|
|
132 {
|
| 967 |
|
|
append icmpv6_msg "group membership reduction"
|
| 968 |
|
|
}
|
| 969 |
|
|
133 {
|
| 970 |
|
|
append icmpv6_msg "router solicitation"
|
| 971 |
|
|
}
|
| 972 |
|
|
134 {
|
| 973 |
|
|
append icmpv6_msg "router advertisement"
|
| 974 |
|
|
}
|
| 975 |
|
|
135 {
|
| 976 |
|
|
append icmpv6_msg "neighbour solicitation"
|
| 977 |
|
|
}
|
| 978 |
|
|
136 {
|
| 979 |
|
|
append icmpv6_msg "neighbour advertisement"
|
| 980 |
|
|
}
|
| 981 |
|
|
137 {
|
| 982 |
|
|
append icmpv6_msg "redirect"
|
| 983 |
|
|
}
|
| 984 |
|
|
}
|
| 985 |
|
|
|
| 986 |
|
|
if { $error && ([string length $packet] >= 44) } {
|
| 987 |
|
|
# The ICMP message contains an IPv6 header and hopefully the TCP or UDP ports as well
|
| 988 |
|
|
binary scan $packet {isccH16H16SS} icmp_junk1 icmp_junk2 ip_protocol icmp_junk3 ip_source ip_dest ip_source_port ip_dest_port
|
| 989 |
|
|
if { 6 == $ip_protocol } {
|
| 990 |
|
|
append icmpv6_msg ", tcp"
|
| 991 |
|
|
} elseif { 17 == $ip_protocol } {
|
| 992 |
|
|
append icmpv6_msg ", udp"
|
| 993 |
|
|
}
|
| 994 |
|
|
append icmpv6_msg " >[ethernet::inet_ipv4_ntoa $ip_dest]:$ip_dest_port <[ethernet::inet_ipv6_ntoa $ip_source]:$ip_source_port"
|
| 995 |
|
|
}
|
| 996 |
|
|
append icmpv6_msg "\n"
|
| 997 |
|
|
synth::output $icmpv6_msg "eth_icmpv6"
|
| 998 |
|
|
|
| 999 |
|
|
if { !$data } {
|
| 1000 |
|
|
return
|
| 1001 |
|
|
}
|
| 1002 |
|
|
|
| 1003 |
|
|
} elseif { 6 == $ip_protocol } {
|
| 1004 |
|
|
# TCP
|
| 1005 |
|
|
if { [string length $packet] < 20 } {
|
| 1006 |
|
|
return
|
| 1007 |
|
|
}
|
| 1008 |
|
|
binary scan $packet {SSIIccSSS} source_port dest_port seq ack hdrsize flags winsize checksum urg
|
| 1009 |
|
|
set source_port [expr $source_port & 0x0FFFF]
|
| 1010 |
|
|
set dest_port [expr $dest_port & 0x0FFFF]
|
| 1011 |
|
|
set hdrsize [expr ($hdrsize >> 4) & 0x0F]
|
| 1012 |
|
|
set winsize [expr $winsize & 0x0FFFF]
|
| 1013 |
|
|
set urg [expr $urg & 0x0FFFF]
|
| 1014 |
|
|
|
| 1015 |
|
|
set tcp_msg "$device $direction tcp: "
|
| 1016 |
|
|
append tcp_msg " >${dest_name}:${dest_port}"
|
| 1017 |
|
|
if { [info exists ethernet::services($dest_port,udp)] } {
|
| 1018 |
|
|
append tcp_msg "($ethernet::services($dest_port,udp))"
|
| 1019 |
|
|
}
|
| 1020 |
|
|
append tcp_msg "<${source_name}:$source_port"
|
| 1021 |
|
|
if { [info exists ethernet::services($source_port,udp)] } {
|
| 1022 |
|
|
append tcp_msg "($ethernet::services($source_port,udp))"
|
| 1023 |
|
|
}
|
| 1024 |
|
|
|
| 1025 |
|
|
append tcp_msg ", "
|
| 1026 |
|
|
if { $flags & 0x08 } {
|
| 1027 |
|
|
append tcp_msg "PSH "
|
| 1028 |
|
|
}
|
| 1029 |
|
|
if { $flags & 0x04 } {
|
| 1030 |
|
|
append tcp_msg "RST "
|
| 1031 |
|
|
}
|
| 1032 |
|
|
if { $flags & 0x02 } {
|
| 1033 |
|
|
append tcp_msg "SYN "
|
| 1034 |
|
|
}
|
| 1035 |
|
|
if { $flags & 0x01 } {
|
| 1036 |
|
|
append tcp_msg "FIN "
|
| 1037 |
|
|
}
|
| 1038 |
|
|
append tcp_msg [format "seq %u" $seq]
|
| 1039 |
|
|
|
| 1040 |
|
|
if { 0 != ($flags & 0x010) } {
|
| 1041 |
|
|
append tcp_msg [format ", ACK %u" $ack]
|
| 1042 |
|
|
}
|
| 1043 |
|
|
append tcp_msg ", win $winsize"
|
| 1044 |
|
|
if { 0 != ($flags & 0x020) } {
|
| 1045 |
|
|
append tcp_msg ", URG $urg"
|
| 1046 |
|
|
}
|
| 1047 |
|
|
append tcp_msg "\n"
|
| 1048 |
|
|
synth::output $tcp_msg "eth_tcp"
|
| 1049 |
|
|
|
| 1050 |
|
|
set packet [string range $packet [expr 4 * $hdrsize] end]
|
| 1051 |
|
|
} elseif { 17 == $ip_protocol } {
|
| 1052 |
|
|
# UDP
|
| 1053 |
|
|
if { [string length $packet] < 8 } {
|
| 1054 |
|
|
return
|
| 1055 |
|
|
}
|
| 1056 |
|
|
set udp_msg "$device $direction: udp "
|
| 1057 |
|
|
binary scan $packet {SSSS} source_port dest_port len checksum
|
| 1058 |
|
|
set source_port [expr $source_port & 0x0FFFF]
|
| 1059 |
|
|
set dest_port [expr $dest_port & 0x0FFFF]
|
| 1060 |
|
|
append udp_msg [format "%d bytes, " [expr $len & 0x0FFFF]]
|
| 1061 |
|
|
append udp_msg " >${dest_name}:$dest_port"
|
| 1062 |
|
|
if { [info exists ethernet::services($dest_port,udp)] } {
|
| 1063 |
|
|
append udp_msg "($ethernet::services($dest_port,udp))"
|
| 1064 |
|
|
}
|
| 1065 |
|
|
append udp_msg "<${source_name}:$source_port"
|
| 1066 |
|
|
if { [info exists ethernet::services($source_port,udp)] } {
|
| 1067 |
|
|
append udp_msg "($ethernet::services($source_port,udp))"
|
| 1068 |
|
|
}
|
| 1069 |
|
|
append udp_msg "\n"
|
| 1070 |
|
|
synth::output $udp_msg "eth_udp"
|
| 1071 |
|
|
set packet [string range $packet 8 end]
|
| 1072 |
|
|
} else {
|
| 1073 |
|
|
# Unknown protocol, so no way of knowing where the data starts.
|
| 1074 |
|
|
return
|
| 1075 |
|
|
}
|
| 1076 |
|
|
|
| 1077 |
|
|
# At this point we may have a payload. This should be
|
| 1078 |
|
|
# dumped in both hex and ascii. The code tries to preserve
|
| 1079 |
|
|
# alignment.
|
| 1080 |
|
|
if { [string length $packet] == 0 } {
|
| 1081 |
|
|
return
|
| 1082 |
|
|
}
|
| 1083 |
|
|
set hexdata_msg "$device $direction: data [format_hex_data $packet]\n"
|
| 1084 |
|
|
set asciidata_msg "$device $direction: data "
|
| 1085 |
|
|
set len [string length $packet]
|
| 1086 |
|
|
if { $len > $ethernet::max_show } {
|
| 1087 |
|
|
set len $ethernet::max_show
|
| 1088 |
|
|
}
|
| 1089 |
|
|
for { set i 0 } { $i < $len } { incr i } {
|
| 1090 |
|
|
set char [string index $packet $i]
|
| 1091 |
|
|
if { "\r" == $char } {
|
| 1092 |
|
|
append asciidata_msg "\\r"
|
| 1093 |
|
|
} elseif { "\n" == $char } {
|
| 1094 |
|
|
append asciidata_msg "\\n"
|
| 1095 |
|
|
} elseif { "\t" == $char } {
|
| 1096 |
|
|
append asciidata_msg "\\t"
|
| 1097 |
|
|
} elseif { [string is print -strict $char] } {
|
| 1098 |
|
|
append asciidata_msg " $char"
|
| 1099 |
|
|
} else {
|
| 1100 |
|
|
append asciidata_msg "??"
|
| 1101 |
|
|
}
|
| 1102 |
|
|
if { 3 == ($i % 4) } {
|
| 1103 |
|
|
append asciidata_msg " "
|
| 1104 |
|
|
}
|
| 1105 |
|
|
}
|
| 1106 |
|
|
append asciidata_msg "\n"
|
| 1107 |
|
|
synth::output $hexdata_msg "eth_hexdata"
|
| 1108 |
|
|
synth::output $asciidata_msg "eth_asciidata"
|
| 1109 |
|
|
|
| 1110 |
|
|
return
|
| 1111 |
|
|
}
|
| 1112 |
|
|
|
| 1113 |
|
|
# A utility for handling the ethernet record button on the toolbar
|
| 1114 |
|
|
proc logging_button_toggle { } {
|
| 1115 |
|
|
if { $ethernet::logging_enabled } {
|
| 1116 |
|
|
set ethernet::logging_enabled 0
|
| 1117 |
|
|
.toolbar.ethernet_logging configure -relief flat
|
| 1118 |
|
|
} else {
|
| 1119 |
|
|
set ethernet::logging_enabled 1
|
| 1120 |
|
|
.toolbar.ethernet_logging configure -relief sunken
|
| 1121 |
|
|
}
|
| 1122 |
|
|
}
|
| 1123 |
|
|
|
| 1124 |
|
|
# A dummy procedure for initialization. All of this could execute at
|
| 1125 |
|
|
# the toplevel, but there are lots of locals.
|
| 1126 |
|
|
proc filters_initialize { } {
|
| 1127 |
|
|
ethernet::read_services
|
| 1128 |
|
|
ethernet::read_protocols
|
| 1129 |
|
|
ethernet::read_hosts
|
| 1130 |
|
|
|
| 1131 |
|
|
# Add a button on the toolbar for enabling/disabling logging.
|
| 1132 |
|
|
# Also add an entry to the help menu
|
| 1133 |
|
|
if { $synth::flag_gui } {
|
| 1134 |
|
|
button .toolbar.ethernet_logging -image $ethernet::image_netrecord -borderwidth 2 -relief flat -command ethernet::logging_button_toggle]
|
| 1135 |
|
|
pack .toolbar.ethernet_logging -side left -padx 2
|
| 1136 |
|
|
synth::register_balloon_help .toolbar.ethernet_logging "Record ethernet traffic"
|
| 1137 |
|
|
|
| 1138 |
|
|
if { [synth::tdf_has_option "ethernet" "logging"] } {
|
| 1139 |
|
|
set ethernet::logging_enabled [synth::tdf_get_option "ethernet" "logging"]
|
| 1140 |
|
|
} else {
|
| 1141 |
|
|
# Default to logging ethernet traffic. This may not be the right thing to do
|
| 1142 |
|
|
# because users may see too much output by default, but it is easy enough
|
| 1143 |
|
|
# to disable.
|
| 1144 |
|
|
set ethernet::logging_enabled 1
|
| 1145 |
|
|
}
|
| 1146 |
|
|
if { $ethernet::logging_enabled } {
|
| 1147 |
|
|
.toolbar.ethernet_logging configure -relief sunken
|
| 1148 |
|
|
}
|
| 1149 |
|
|
|
| 1150 |
|
|
set ethernet_help [file join $synth::device_src_dir "doc" "devs-eth-synth-ecosynth.html"]
|
| 1151 |
|
|
if { ![file readable $ethernet_help] } {
|
| 1152 |
|
|
synth::report_warning "Failed to locate synthetic ethernet documentation $ethernet_help\n \
|
| 1153 |
|
|
Help->Ethernet target menu option disabled.\n"
|
| 1154 |
|
|
set ethernet_help ""
|
| 1155 |
|
|
}
|
| 1156 |
|
|
if { "" == $ethernet_help } {
|
| 1157 |
|
|
.menubar.help add command -label "Ethernet" -state disabled
|
| 1158 |
|
|
} else {
|
| 1159 |
|
|
.menubar.help add command -label "Ethernet" -command [list synth::handle_help "file://$ethernet_help"]
|
| 1160 |
|
|
}
|
| 1161 |
|
|
}
|
| 1162 |
|
|
|
| 1163 |
|
|
if { [synth::tdf_has_option "ethernet" "max_show"] } {
|
| 1164 |
|
|
set ethernet::max_show [synth::tdf_get_option "ethernet" "max_show"]
|
| 1165 |
|
|
if { ! [string is integer -strict $ethernet::max_show] } {
|
| 1166 |
|
|
synth::report_error "Ethernet device, invalid value in target definition file $synth::target_definition\n \
|
| 1167 |
|
|
Entry max_show should be a simple integer, not $ethernet::max_show\n"
|
| 1168 |
|
|
set ethernet::init_ok 0
|
| 1169 |
|
|
}
|
| 1170 |
|
|
}
|
| 1171 |
|
|
|
| 1172 |
|
|
# Filters. First, perform some validation.
|
| 1173 |
|
|
set known_filters [list "ether" "arp" "ipv4" "ipv6" "icmpv4" "icmpv6" "udp" "tcp" "hexdata" "asciidata"]
|
| 1174 |
|
|
set tdf_filters [synth::tdf_get_options "ethernet" "filter"]
|
| 1175 |
|
|
array set filter_options [list]
|
| 1176 |
|
|
|
| 1177 |
|
|
foreach filter $tdf_filters {
|
| 1178 |
|
|
if { 0 == [llength $filter] } {
|
| 1179 |
|
|
synth::report_error "Ethernet device, invalid value in target definition file $synth::target_definition\n \
|
| 1180 |
|
|
Option \"filter\" requires the name of a known filters.\n"
|
| 1181 |
|
|
set ethernet::init_ok 0
|
| 1182 |
|
|
continue
|
| 1183 |
|
|
}
|
| 1184 |
|
|
set name [lindex $filter 0]
|
| 1185 |
|
|
if { [info exists filter_options($name)] } {
|
| 1186 |
|
|
synth::report_error "Ethernet device, invalid value in target definition file $synth::target_definition\n \
|
| 1187 |
|
|
\"filter $name\" should be defined only once.\n"
|
| 1188 |
|
|
set ethernet::init_ok 0
|
| 1189 |
|
|
continue
|
| 1190 |
|
|
}
|
| 1191 |
|
|
if { -1 == [lsearch -exact $known_filters $name] } {
|
| 1192 |
|
|
synth::report_error "Ethernet device, invalid value in target definition file $synth::target_definition\n \
|
| 1193 |
|
|
Unknown filter \"$name\".\n \
|
| 1194 |
|
|
Known filters are $known_filters\n"
|
| 1195 |
|
|
set ethernet::init_ok 0
|
| 1196 |
|
|
continue
|
| 1197 |
|
|
}
|
| 1198 |
|
|
set filter_options($name) [lrange $filter 1 end]
|
| 1199 |
|
|
}
|
| 1200 |
|
|
|
| 1201 |
|
|
# We now know about all the filter entries in the target definition file.
|
| 1202 |
|
|
# Time to create the filters themselves, provided we are running in GUI mode.
|
| 1203 |
|
|
if { $synth::flag_gui } {
|
| 1204 |
|
|
foreach filter $known_filters {
|
| 1205 |
|
|
if { ! [info exists filter_options($filter)] } {
|
| 1206 |
|
|
synth::filter_add "eth_$filter" -text "ethernet $filter"
|
| 1207 |
|
|
} else {
|
| 1208 |
|
|
array set parsed_options [list]
|
| 1209 |
|
|
set message ""
|
| 1210 |
|
|
if { ![synth::filter_parse_options $filter_options($filter) parsed_options message] } {
|
| 1211 |
|
|
synth::report_error \
|
| 1212 |
|
|
"Invalid entry in target definition file $synth::target_definition\n \
|
| 1213 |
|
|
Ethernet filter $filter\n $message"
|
| 1214 |
|
|
set ethernet::init_ok 0
|
| 1215 |
|
|
} else {
|
| 1216 |
|
|
set parsed_options("-text") "ethernet $filter"
|
| 1217 |
|
|
synth::filter_add_parsed "eth_$filter" parsed_options
|
| 1218 |
|
|
}
|
| 1219 |
|
|
}
|
| 1220 |
|
|
}
|
| 1221 |
|
|
}
|
| 1222 |
|
|
}
|
| 1223 |
|
|
ethernet::filters_initialize
|
| 1224 |
|
|
}
|
| 1225 |
|
|
|
| 1226 |
|
|
return ethernet::instantiate
|
