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;;; rfc.icmp - Internet Control Message Protocol
;;;
;;; Copyright (c) 2007-2010 Shiro Kawai <shiro@acm.org>
;;;
;;; 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.
;;;
;;; 3. Neither the name of the authors nor the names of its contributors
;;; may be used to endorse or promote products derived from this
;;; software without specific prior written permission.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
;;; OWNER 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.
;;;
;; EXPERIMENTAL
;; RFC 792 Internet Control Message Protocol
;; RFC 1256 ICMP Router Discovery Messages
;; RFC 1393 Traceroute Using an IP Option
;; RFC 1788 ICMP Domain Name Messages
;; RFC 1812 Requirements for IP Version 4 Routers
;; RFC 2002 IP Mobility Supprot
;; RFC 2463 ICMPv6
;; RFC 2521 ICMP Security Failures Messages
;; Also useful:
;; http://www.iana.org/assignments/icmp-parameters
(define-module rfc.icmp
(use gauche.uvector)
(use gauche.net)
(use binary.io)
(export icmp4-message-type->string
ICMP4_ECHOREPLY ICMP4_DEST_UNREACH ICMP4_SOURCE_QUENCH
ICMP4_REDIRECT ICMP4_ECHO ICMP4_ROUTER_ADVERT ICMP4_ROUTER_SOLICIT
ICMP4_TIME_EXCEEDED ICMP4_PARAMETERPROB ICMP4_TIMESTAMP
ICMP4_TIMESTAMPREPLY ICMP4_INFO_REQUEST ICMP4_INFO_REPLY
ICMP4_ADDRESS ICMP4_ADDRESSREPLY ICMP4_TRACEROUTE
ICMP4_DGRAMCONVERROR ICMP4_DOMAIN_REQUEST ICMP4_DOMAIN_REPLY
ICMP4_SECURITYFAILURE
icmp4-unreach-code->string
ICMP4_NET_UNREACH ICMP4_HOST_UNREACH ICMP4_PROT_UNREACH
ICMP4_PORT_UNREACH ICMP4_FRAG_NEEDED ICMP4_SR_FAILED
ICMP4_NET_UNKNOWN ICMP4_HOST_UNKNOWN ICMP4_HOST_ISOLATED
ICMP4_NET_ANO ICMP4_HOST_ANO ICMP4_NET_UNR_TOS ICMP4_HOST_UNR_TOS
ICMP4_PKT_FILTERED ICMP4_PREC_VIOLATION ICMP4_PREC_CUTOFF
icmp4-redirect-code->string
ICMP4_REDIR_NET ICMP4_REDIR_HOST ICMP4_REDIR_NETTOS
ICMP4_REDIR_HOSTTOS
icmp4-router-code->string
ICMP4_ROUTER_NORMAL ICMP4_ROUTER_NOCOMMON
icmp4-exceeded-code->string
ICMP4_EXC_TTL ICMP4_EXC_FRAGTIME
icmp4-parameter-code->string
ICMP4_PARAM_PTR ICMP4_PARAM_MISSING ICMP4_PARAM_BADLENGTH
icmp4-security-code->string
ICMP4_SEC_BADSPI ICMP4_SEC_AUTHFAILED ICMP4_SEC_DECOMPFAILED
ICMP4_SEC_DECRYPTFAILED ICMP4_SEC_NEEDAUTHENTICATION
ICMP4_SEC_NEEDAUTHORIZATION
icmp6-message-type->string
ICMP6_DEST_UNREACH ICMP6_PACKET_TOO_BIG ICMP6_TIME_EXCEEDED
ICMP6_PARAMETERPROB ICMP6_ECHO ICMP6_ECHOREPLY
icmp6-unreach-code->string
ICMP6_UNREACH_NOROUTE ICMP6_UNREACH_ADMIN ICMP6_UNREACH_BEYONDSCOPE
ICMP6_UNREACH_ADDR ICMP6_UNREACH_NOPORT
icmp6-exceeded-code->string
ICMP6_EXC_TRANSIT ICMP6_EXC_REASSEMBLY
icmp6-parameter-code->string
ICMP6_PARAM_HEADER ICMP6_PARAM_NEXTHEADER ICMP6_PARAM_OPTION
icmp-fill-header!
icmp4-fill-checksum! icmp4-fill-echo!
icmp6-fill-echo!
icmp-packet-type icmp-packet-code
icmp-echo-ident icmp-echo-sequence
icmp4-describe-packet icmp6-describe-packet
))
(select-module rfc.icmp)
;;============================================================
;; Constants
;;
;; NB: it seems that these symbols in C slightly differ among the
;; underlying ICMP library, e.g. between GNU/Linux and BSD.
;; I follow the GNU convention, for it is a bit more descriptive.
(define-syntax define-named-code
(syntax-rules ()
((_ name ->string (sym val expl) ...)
(begin
(define-constant sym val) ...
(define (->string c)
(case c
((val) expl) ...
(else (format "Unknown code ~s for ~a" c name))))))))
;;-------------------------------------------------------------
;; ICMPv4
;;
;; ICMP message types.
(define-named-code "ICMP message types"
icmp4-message-type->string
(ICMP4_ECHOREPLY 0 "Echo Reply")
(ICMP4_DEST_UNREACH 3 "Destination Unreachable")
(ICMP4_SOURCE_QUENCH 4 "Source Quench ")
(ICMP4_REDIRECT 5 "Redirect (change route)")
(ICMP4_ECHO 8 "Echo Request")
(ICMP4_ROUTER_ADVERT 9 "Router Advertisement")
(ICMP4_ROUTER_SOLICIT 10 "Router solicitation")
(ICMP4_TIME_EXCEEDED 11 "Time Exceeded")
(ICMP4_PARAMETERPROB 12 "Parameter Problem")
(ICMP4_TIMESTAMP 13 "Timestamp Request")
(ICMP4_TIMESTAMPREPLY 14 "Timestamp Reply")
(ICMP4_INFO_REQUEST 15 "Information Request")
(ICMP4_INFO_REPLY 16 "Information Reply")
(ICMP4_ADDRESS 17 "Address Mask Request")
(ICMP4_ADDRESSREPLY 18 "Address Mask Reply")
(ICMP4_TRACEROUTE 30 "Traceroute")
(ICMP4_DGRAMCONVERROR 31 "Datagram Conversion Error")
(ICMP4_DOMAIN_REQUEST 37 "Domain Name Request")
(ICMP4_DOMAIN_REPLY 38 "Domain Name Reply")
(ICMP4_SECURITYFAILURE 40 "Security Failures")
)
;; Codes
(define-named-code "ICMP UNREACH codes"
icmp4-unreach-code->string
(ICMP4_NET_UNREACH 0 "Network Unreachable")
(ICMP4_HOST_UNREACH 1 "Host Unreachable")
(ICMP4_PROT_UNREACH 2 "Protocol Unreachable")
(ICMP4_PORT_UNREACH 3 "Port Unreachable")
(ICMP4_FRAG_NEEDED 4 "Fragmentation Needed/DF set")
(ICMP4_SR_FAILED 5 "Source Route failed")
(ICMP4_NET_UNKNOWN 6 "Unknown Net")
(ICMP4_HOST_UNKNOWN 7 "Unknown Host")
(ICMP4_HOST_ISOLATED 8 "Source Host Isolated")
(ICMP4_NET_ANO 9 "Dest Network Prohibited")
(ICMP4_HOST_ANO 10 "Dest Host Prohibited")
(ICMP4_NET_UNR_TOS 11 "Dest Netowork Unreachable for TOS")
(ICMP4_HOST_UNR_TOS 12 "Dest Host Unreachable for TOS")
(ICMP4_PKT_FILTERED 13 "Packet Filtered")
(ICMP4_PREC_VIOLATION 14 "Precedence Violation")
(ICMP4_PREC_CUTOFF 15 "Precedence Cut Off")
)
(define-named-code "ICMP REDIRECT codes"
icmp4-redirect-code->string
(ICMP4_REDIR_NET 0 "Redirect Net")
(ICMP4_REDIR_HOST 1 "Redirect Host")
(ICMP4_REDIR_NETTOS 2 "Redirect Net for TOS")
(ICMP4_REDIR_HOSTTOS 3 "Redirect Host for TOS")
)
(define-named-code "ICMP ROUTER ADVERTISE codes"
icmp4-router-code->string
(ICMP4_ROUTER_NORMAL 0 "Normal Router Advertisement")
(ICMP4_ROUTER_NOCOMMON 16 "Does not route common traffic")
)
(define-named-code "ICMP TIME EXCEEDED codes"
icmp4-exceeded-code->string
(ICMP4_EXC_TTL 0 "TTL count exceeded")
(ICMP4_EXC_FRAGTIME 1 "Fragment Reass time exceeded")
)
(define-named-code "ICMP PARAMETER PROBLEM codes"
icmp4-parameter-code->string
(ICMP4_PARAM_PTR 0 "Pointer indicates the error")
(ICMP4_PARAM_MISSING 1 "Missing Required Option")
(ICMP4_PARAM_BADLENGTH 2 "Bad Length")
)
(define-named-code "ICMP SECURITY FAILURE codes"
icmp4-security-code->string
(ICMP4_SEC_BADSPI 0 "Bad SPI")
(ICMP4_SEC_AUTHFAILED 1 "Authentication Failed")
(ICMP4_SEC_DECOMPFAILED 2 "Decompression Failed")
(ICMP4_SEC_DECRYPTFAILED 3 "Decryption Failed")
(ICMP4_SEC_NEEDAUTHENTICATION 4 "Need Authentication")
(ICMP4_SEC_NEEDAUTHORIZATION 5 "Need Authorization")
)
;;-------------------------------------------------------------
;; ICMPv6
;;
(define-named-code "ICMP6 message types"
icmp6-message-type->string
(ICMP6_DEST_UNREACH 1 "Destination unreachable")
(ICMP6_PACKET_TOO_BIG 2 "Packet Too Big")
(ICMP6_TIME_EXCEEDED 3 "Time Exceeded")
(ICMP6_PARAMETERPROB 4 "Parameter problem")
(ICMP6_ECHO 128 "Echo request")
(ICMP6_ECHOREPLY 129 "Echo reply")
)
(define-named-code "ICMP6 UNREACH codes"
icmp6-unreach-code->string
(ICMP6_UNREACH_NOROUTE 0 "No route to destination")
(ICMP6_UNREACH_ADMIN 1 "Communication administratively prohibited")
(ICMP6_UNREACH_BEYONDSCOPE 2 "Beyond scope of source address")
(ICMP6_UNREACH_ADDR 3 "Address unreachable")
(ICMP6_UNREACH_NOPORT 4 "Bad port")
)
(define-named-code "ICMP6 TIME EXCEEDED codes"
icmp6-exceeded-code->string
(ICMP6_EXC_TRANSIT 0 "Hop limit == 0 in transit")
(ICMP6_EXC_REASSEMBLY 1 "Reassembly time out")
)
(define-named-code "ICMP6 PARAMETER PROBLEM codes"
icmp6-parameter-code->string
(ICMP6_PARAM_HEADER 0 "Erroneous header field")
(ICMP6_PARAM_NEXTHEADER 1 "Unrecognized next header")
(ICMP6_PARAM_OPTION 2 "Unrecognized IPv6 option")
)
;;============================================================
;; Packet construction
;;
;; The low-level 'fill' routines operates on pre-allocated u8vector
;; as buffer. They don't allocate, so that they can be used
;; in inner loops.
;; Fill ICMP/ICMP6 packet header (except checksum)
(define-inline (icmp-fill-header! buf type code)
(put-u8! buf 0 type)
(put-u8! buf 1 code)
(put-u16be! buf 2 0))
(define (icmp4-fill-checksum! buf size)
(put-u16be! buf 2 (inet-checksum buf size)))
(define (icmp4-fill-echo! buf ident seq data)
(icmp-fill-header! buf ICMP4_ECHO 0)
(put-u16be! buf 4 ident)
(put-u16be! buf 6 seq)
(u8vector-copy! buf 8 data)
(icmp4-fill-checksum! buf (+ (u8vector-length data) 8)))
;; We don't need to fill out checksum fields, for the kernel calculates it.
(define (icmp6-fill-echo! buf ident seq data)
(icmp-fill-header! buf ICMP6_ECHO 0)
(put-u16be! buf 4 ident)
(put-u16be! buf 6 seq)
(u8vector-copy! buf 8 data))
;;============================================================
;; Packet decomposition
;;
;; common to v4/v6
(define (icmp-packet-type buf offset)
(get-u8 buf (+ 0 offset)))
;; common to v4/v6
(define (icmp-packet-code buf offset)
(get-u8 buf (+ 1 offset)))
;; common to v4/v6
(define (icmp-echo-ident buf offset)
(get-u16be buf (+ 4 offset)))
;; common to v4/v6
(define (icmp-echo-sequence buf offset)
(get-u16be buf (+ 6 offset)))
(define (icmp4-describe-packet buf offset)
(let ((type (icmp-packet-type buf offset))
(code (icmp-packet-code buf offset)))
(format #t "ICMP packet type=~a(~a)\n"
type (icmp4-message-type->string type))
(cond
((memv type `(,ICMP4_ECHOREPLY ,ICMP4_ECHO))
(format #t " ident=~2,'0x seq=~2,'0x\n"
(icmp-echo-ident buf offset) (icmp-echo-sequence buf offset)))
((assv type `((,ICMP4_DEST_UNREACH . ,icmp4-unreach-code->string)
(,ICMP4_REDIRECT . ,icmp4-redirect-code->string)
(,ICMP4_ROUTER_ADVERT . ,icmp4-router-code->string)
(,ICMP4_TIME_EXCEEDED . ,icmp4-exceeded-code->string)
(,ICMP4_PARAMETERPROB . ,icmp4-parameter-code->string)
(,ICMP4_SECURITYFAILURE . ,icmp4-security-code->string)))
=> (lambda (p)
(format #t " code=~a(~a)\n" code ((cdr p) code))))
)))
(define (icmp6-describe-packet buf offset)
(let ((type (icmp-packet-type buf offset))
(code (icmp-packet-code buf offset)))
(format #t "ICMPv6 packet type=~a(~a)\n"
type (icmp6-message-type->string type))
(cond
((= type ICMP6_ECHOREPLY)
(format #t " ident=~2,'0x seq=~2,'0x\n"
(icmp-echo-ident buf offset) (icmp-echo-sequence buf offset)))
((assv type `((,ICMP6_DEST_UNREACH . ,icmp6-unreach-code->string)
(,ICMP6_TIME_EXCEEDED . ,icmp6-exceeded-code->string)
(,ICMP6_PARAMETERPROB . ,icmp6-parameter-code->string)))
=> (lambda (p)
(format #t " code=~a(~a)\n" code ((cdr p) code))))
)))
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