;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; ;; ;; Copyright (C) KolibriOS team 2004-2010. All rights reserved. ;; ;; Distributed under terms of the GNU General Public License ;; ;; ;; ;; ICMP.INC ;; ;; ;; ;; Part of the tcp/ip network stack for KolibriOS ;; ;; ;; ;; Based on the work of [Johnny_B] and [smb] ;; ;; ;; ;; Written by hidnplayr@kolibrios.org ;; ;; ;; ;; GNU GENERAL PUBLIC LICENSE ;; ;; Version 2, June 1991 ;; ;; ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; $Revision$ ; ICMP types & codes ICMP_ECHOREPLY = 0 ; echo reply message ICMP_UNREACH = 3 ICMP_UNREACH_NET = 0 ; bad net ICMP_UNREACH_HOST = 1 ; bad host ICMP_UNREACH_PROTOCOL = 2 ; bad protocol ICMP_UNREACH_PORT = 3 ; bad port ICMP_UNREACH_NEEDFRAG = 4 ; IP_DF caused drop ICMP_UNREACH_SRCFAIL = 5 ; src route failed ICMP_UNREACH_NET_UNKNOWN = 6 ; unknown net ICMP_UNREACH_HOST_UNKNOWN = 7 ; unknown host ICMP_UNREACH_ISOLATED = 8 ; src host isolated ICMP_UNREACH_NET_PROHIB = 9 ; prohibited access ICMP_UNREACH_HOST_PROHIB = 10 ; ditto ICMP_UNREACH_TOSNET = 11 ; bad tos for net ICMP_UNREACH_TOSHOST = 12 ; bad tos for host ICMP_UNREACH_FILTER_PROHIB = 13 ; admin prohib ICMP_UNREACH_HOST_PRECEDENCE = 14 ; host prec vio. ICMP_UNREACH_PRECEDENCE_CUTOFF = 15 ; prec cutoff ICMP_SOURCEQUENCH = 4 ; Packet lost, slow down ICMP_REDIRECT = 5 ; shorter route, codes: ICMP_REDIRECT_NET = 0 ; for network ICMP_REDIRECT_HOST = 1 ; for host ICMP_REDIRECT_TOSNET = 2 ; for tos and net ICMP_REDIRECT_TOSHOST = 3 ; for tos and host ICMP_ALTHOSTADDR = 6 ; alternate host address ICMP_ECHO = 8 ; echo service ICMP_ROUTERADVERT = 9 ; router advertisement ICMP_ROUTERADVERT_NORMAL = 0 ; normal advertisement ICMP_ROUTERADVERT_NOROUTE_COMMON= 16 ; selective routing ICMP_ROUTERSOLICIT = 10 ; router solicitation ICMP_TIMXCEED = 11 ; time exceeded, code: ICMP_TIMXCEED_INTRANS = 0 ; ttl==0 in transit ICMP_TIMXCEED_REASS = 1 ; ttl==0 in reass ICMP_PARAMPROB = 12 ; ip header bad ICMP_PARAMPROB_ERRATPTR = 0 ; error at param ptr ICMP_PARAMPROB_OPTABSENT = 1 ; req. opt. absent ICMP_PARAMPROB_LENGTH = 2 ; bad length ICMP_TSTAMP = 13 ; timestamp request ICMP_TSTAMPREPLY = 14 ; timestamp reply ICMP_IREQ = 15 ; information request ICMP_IREQREPLY = 16 ; information reply ICMP_MASKREQ = 17 ; address mask request ICMP_MASKREPLY = 18 ; address mask reply ICMP_TRACEROUTE = 30 ; traceroute ICMP_DATACONVERR = 31 ; data conversion error ICMP_MOBILE_REDIRECT = 32 ; mobile host redirect ICMP_IPV6_WHEREAREYOU = 33 ; IPv6 where-are-you ICMP_IPV6_IAMHERE = 34 ; IPv6 i-am-here ICMP_MOBILE_REGREQUEST = 35 ; mobile registration req ICMP_MOBILE_REGREPLY = 36 ; mobile registreation reply ICMP_SKIP = 39 ; SKIP ICMP_PHOTURIS = 40 ; Photuris ICMP_PHOTURIS_UNKNOWN_INDEX = 1 ; unknown sec index ICMP_PHOTURIS_AUTH_FAILED = 2 ; auth failed ICMP_PHOTURIS_DECRYPT_FAILED = 3 ; decrypt failed struct ICMP_header Type db ? Code db ? Checksum dw ? Identifier dw ? SequenceNumber dw ? ends align 4 uglobal ICMP_PACKETS_TX rd MAX_NET_DEVICES ICMP_PACKETS_RX rd MAX_NET_DEVICES endg ;----------------------------------------------------------------- ; ; ICMP_init ; ;----------------------------------------------------------------- macro ICMP_init { xor eax, eax mov edi, ICMP_PACKETS_TX mov ecx, 2*MAX_NET_DEVICES rep stosd } ;----------------------------------------------------------------- ; ; ICMP_input: ; ; This procedure will send reply's to ICMP echo's ; and insert packets into sockets when needed ; ; IN: Pointer to buffer in [esp] ; size of buffer in [esp+4] ; ebx = pointer to device struct ; ecx = ICMP Packet size ; esi = ptr to ICMP Packet data ; edi = ptr to ipv4 source and dest address ; ; OUT: / ; ;----------------------------------------------------------------- align 4 ICMP_input: DEBUGF DEBUG_NETWORK_VERBOSE, "ICMP_input:\n" ; First, check the checksum (altough some implementations ignore it) push esi ecx push [esi + ICMP_header.Checksum] mov [esi + ICMP_header.Checksum], 0 xor edx, edx call checksum_1 call checksum_2 pop si cmp dx, si pop ecx edx jne .checksum_mismatch cmp [edx + ICMP_header.Type], ICMP_ECHO ; Is this an echo request? jne .check_sockets ; We well re-use the packet so we can create the response as fast as possible ; Notice: this only works on pure ethernet DEBUGF DEBUG_NETWORK_VERBOSE, "got echo request\n" mov [edx + ICMP_header.Type], ICMP_ECHOREPLY ; Change Packet type to reply mov esi, [esp] ; Start of buffer cmp dword[edi + 4], 1 shl 24 + 127 je .loopback ; Update stats (and validate device ptr) call NET_ptr_to_num cmp edi,-1 je .dump inc [ICMP_PACKETS_RX + 4*edi] inc [ICMP_PACKETS_TX + 4*edi] ; exchange dest and source address in IP header ; exchange dest and source MAC in ETH header push dword [esi + ETH_header.DstMAC] push dword [esi + ETH_header.SrcMAC] pop dword [esi + ETH_header.DstMAC] pop dword [esi + ETH_header.SrcMAC] push word [esi + ETH_header.DstMAC + 4] push word [esi + ETH_header.SrcMAC + 4] pop word [esi + ETH_header.DstMAC + 4] pop word [esi + ETH_header.SrcMAC + 4] add esi, sizeof.ETH_header-2 .loopback: add esi, 2 push [esi + IPv4_header.SourceAddress] push [esi + IPv4_header.DestinationAddress] pop [esi + IPv4_header.SourceAddress] pop [esi + IPv4_header.DestinationAddress] ; Recalculate ip header checksum movzx ecx, [esi + IPv4_header.VersionAndIHL] ; Calculate IP Header length by using IHL field and ecx, 0x0f shl cx, 2 mov edi, ecx ; IP header length mov eax, edx ; ICMP packet start addr push esi ; Calculate the IP checksum xor edx, edx ; call checksum_1 ; call checksum_2 ; pop esi ; mov [esi + IPv4_header.HeaderChecksum], dx ; ; Recalculate ICMP CheckSum movzx ecx, [esi + IPv4_header.TotalLength] ; Find length of IP Packet xchg ch, cl ; sub ecx, edi ; IP packet length - IP header length = ICMP packet length mov esi, eax ; Calculate ICMP checksum xor edx, edx ; call checksum_1 ; call checksum_2 ; mov [eax + ICMP_header.Checksum], dx ; ; Transmit the packet (notice that packet ptr and packet size have been on stack since start of the procedure!) call [ebx + NET_DEVICE.transmit] ret .check_sockets: ; Look for an open ICMP socket mov esi, [edi] ; ipv4 source address mov eax, net_sockets .try_more: ; mov , [edx + ICMP_header.Identifier] .next_socket: mov eax, [eax + SOCKET.NextPtr] or eax, eax jz .dump cmp [eax + SOCKET.Domain], AF_INET4 jne .next_socket cmp [eax + SOCKET.Protocol], IP_PROTO_ICMP jne .next_socket cmp [eax + IP_SOCKET.RemoteIP], esi jne .next_socket ; cmp [eax + ICMP_SOCKET.Identifier], ; jne .next_socket ; call IPv4_dest_to_dev ; cmp edi,-1 ; je .dump ; inc [ICMP_PACKETS_RX+edi] DEBUGF DEBUG_NETWORK_VERBOSE, "socket=%x\n", eax pusha lea ecx, [eax + SOCKET.mutex] call mutex_lock popa mov esi, edx jmp SOCKET_input .checksum_mismatch: DEBUGF DEBUG_NETWORK_VERBOSE, "checksum mismatch\n" .dump: DEBUGF DEBUG_NETWORK_VERBOSE, "ICMP_input: dumping\n" call kernel_free add esp, 4 ; pop (balance stack) ret ;----------------------------------------------------------------- ; ; ICMP_output ; ; IN: eax = dest ip ; ebx = source ip ; ecx = data length ; dh = type ; dl = code ; esi = data offset ; edi = identifier shl 16 + sequence number ; ;----------------------------------------------------------------- align 4 ICMP_output: DEBUGF DEBUG_NETWORK_VERBOSE, "Creating ICMP Packet\n" push esi edi dx mov edx, [eax + IP_SOCKET.LocalIP] mov eax, [eax + IP_SOCKET.RemoteIP] add ecx, sizeof.ICMP_header mov di, IP_PROTO_ICMP SHL 8 + 128 ; TTL call IPv4_output jz .exit DEBUGF DEBUG_NETWORK_VERBOSE, "full icmp packet size: %u\n", edx pop word [edi + ICMP_header.Type] ; Write both type and code bytes at once pop dword [edi + ICMP_header.Identifier] ; identifier and sequence number mov [edi + ICMP_header.Checksum], 0 push ebx ecx edx mov esi, edi xor edx, edx call checksum_1 call checksum_2 mov [edi + ICMP_header.Checksum], dx pop edx ecx ebx esi sub ecx, sizeof.ICMP_header add edi, sizeof.ICMP_header push cx shr cx, 2 rep movsd pop cx and cx, 3 rep movsb sub edi, edx ;;; TODO: find a better way to remember start of packet push edx edi DEBUGF DEBUG_NETWORK_VERBOSE, "Sending ICMP Packet\n" call [ebx + NET_DEVICE.transmit] ret .exit: DEBUGF DEBUG_NETWORK_ERROR, "Creating ICMP Packet failed\n" add esp, 2*4 + 2 ret ;----------------------------------------------------------------- ; ; ICMP_output ; ; IN: eax = socket ptr ; ecx = data length ; esi = data offset ; ;----------------------------------------------------------------- align 4 ICMP_output_raw: DEBUGF DEBUG_NETWORK_VERBOSE, "Creating ICMP Packet for socket %x, data ptr=%x\n", eax, edx push edx mov di, IP_PROTO_ICMP SHL 8 + 128 ; TTL mov edx, [eax + IP_SOCKET.LocalIP] mov eax, [eax + IP_SOCKET.RemoteIP] call IPv4_output jz .exit pop esi push edx push eax push edi ecx DEBUGF DEBUG_NETWORK_VERBOSE, "copying %u bytes from %x to %x\n", ecx, esi, edi rep movsb pop ecx edi mov [edi + ICMP_header.Checksum], 0 mov esi, edi xor edx, edx call checksum_1 call checksum_2 mov [edi + ICMP_header.Checksum], dx DEBUGF DEBUG_NETWORK_VERBOSE, "Sending ICMP Packet\n" call [ebx + NET_DEVICE.transmit] ret .exit: DEBUGF DEBUG_NETWORK_ERROR, "Creating ICMP Packet failed\n" add esp, 4 ret ;----------------------------------------------------------------- ; ; ICMP_API ; ; This function is called by system function 75 ; ; IN: subfunction number in bl ; device number in bh ; ecx, edx, .. depends on subfunction ; ; OUT: ; ;----------------------------------------------------------------- align 4 ICMP_api: movzx eax, bh shl eax, 2 test bl, bl jz .packets_tx ; 0 dec bl jz .packets_rx ; 1 .error: mov eax, -1 ret .packets_tx: mov eax, [ICMP_PACKETS_TX + eax] ret .packets_rx: mov eax, [ICMP_PACKETS_RX + eax] ret