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1 | ha | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; IP.INC ;; |
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4 | ;; ;; |
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5 | ;; IP Processes for Menuet OS TCP/IP stack ;; |
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6 | ;; ;; |
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7 | ;; Version 0.3 29 August 2002 ;; |
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8 | ;; ;; |
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9 | ;; Copyright 2002 Mike Hibbett, mikeh@oceanfree.net ;; |
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10 | ;; ;; |
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11 | ;; See file COPYING for details ;; |
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12 | ;; ;; |
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13 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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14 | |||
593 | mikedld | 15 | $Revision: 2971 $ |
16 | |||
17 | |||
261 | hidnplayr | 18 | ; IP underlying protocols numbers |
19 | PROTOCOL_ICMP equ 1 |
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20 | PROTOCOL_TCP equ 6 |
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21 | PROTOCOL_UDP equ 17 |
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1 | ha | 22 | |
261 | hidnplayr | 23 | struc IP_PACKET |
24 | { .VersionAndIHL db ? ;+00 - Version[0-3 bits] and IHL(header length)[4-7 bits] |
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25 | .TypeOfService db ? ;+01 |
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26 | .TotalLength dw ? ;+02 |
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27 | .Identification dw ? ;+04 |
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28 | .FlagsAndFragmentOffset dw ? ;+06 - Flags[0-2] and FragmentOffset[3-15] |
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29 | .TimeToLive db ? ;+08 |
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30 | .Protocol db ? ;+09 |
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31 | .HeaderChecksum dw ? ;+10 |
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32 | .SourceAddress dd ? ;+12 |
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33 | .DestinationAddress dd ? ;+16 |
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34 | .DataOrOptional dd ? ;+20 |
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35 | } |
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36 | |||
37 | virtual at 0 |
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38 | IP_PACKET IP_PACKET |
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39 | end virtual |
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40 | |||
41 | |||
1 | ha | 42 | ;******************************************************************* |
43 | ; Interface |
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44 | ; |
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45 | ; ip_rx processes all packets received by the network layer |
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46 | ; It calls the appropriate protocol handler |
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47 | ; |
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48 | ; |
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49 | ; |
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50 | ;******************************************************************* |
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51 | |||
52 | |||
261 | hidnplayr | 53 | ; |
54 | ; IP Packet after reception - Normal IP packet format |
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55 | ; |
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56 | ; 0 1 2 3 |
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57 | ; 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 |
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58 | ; |
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59 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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60 | ;0 |Version| IHL |Type of Service| Total Length | |
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61 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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62 | ;4 | Identification |Flags| Fragment Offset | |
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63 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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64 | ;8 | Time to Live | Protocol | Header Checksum | |
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65 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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66 | ;12 | Source Address | |
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67 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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68 | ;16 | Destination Address | |
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69 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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70 | ;20 | Data | |
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71 | ; +-+-+-.......... -+ |
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72 | ; |
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73 | ; |
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74 | ; [smb] attention! according to RFC 791 IP packet may have 'options' sections, |
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75 | ; so we can't simply think, that data have offset 20. We must calculate offset from |
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76 | ; IHL field |
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77 | ; |
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78 | macro GET_IHL reg, header_addr |
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79 | { |
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80 | movzx reg, byte [header_addr] |
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81 | |||
82 | ; we need 4-7 bits, so.... |
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83 | and reg, 0x0000000F |
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84 | |||
85 | ; IHL keeps number of octets, so we need to << 2 'reg' |
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86 | shl reg, 2 |
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87 | } |
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88 | |||
89 | |||
914 | serge | 90 | include "tcp.inc" |
91 | include "udp.inc" |
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92 | include "icmp.inc" |
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93 | |||
1 | ha | 94 | ;*************************************************************************** |
95 | ; Function |
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96 | ; ip_rx |
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97 | ; |
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98 | ; Description |
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99 | ; This is a kernel function, called by stack_handler |
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261 | hidnplayr | 100 | ; Processes all IP-packets received by the network layer |
101 | ; It calls the appropriate protocol handler |
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1 | ha | 102 | ; |
103 | ;*************************************************************************** |
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261 | hidnplayr | 104 | proc ip_rx stdcall |
105 | local buffer_number dd ? |
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106 | |||
1 | ha | 107 | ; Look for a buffer to tx |
108 | mov eax, IPIN_QUEUE |
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109 | call dequeue |
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110 | cmp ax, NO_BUFFER |
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261 | hidnplayr | 111 | je .exit ; Exit if no buffer available |
1 | ha | 112 | |
261 | hidnplayr | 113 | mov [buffer_number], eax ;save buffer number |
1 | ha | 114 | |
115 | ; convert buffer pointer eax to the absolute address |
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261 | hidnplayr | 116 | imul eax, IPBUFFSIZE |
1 | ha | 117 | add eax, IPbuffs |
118 | |||
261 | hidnplayr | 119 | mov ebx, eax ; ebx=pointer to IP_PACKET |
1 | ha | 120 | |
914 | serge | 121 | ; DEBUGF 1, "K : ip_rx - proto: %u\n", [ebx + IP_PACKET.Protocol]:1 |
122 | |||
1 | ha | 123 | ; Validate the IP checksum |
261 | hidnplayr | 124 | mov dx, word[ebx + IP_PACKET.HeaderChecksum] |
125 | xchg dh,dl ; Get the checksum in intel format |
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126 | |||
914 | serge | 127 | mov [ebx + IP_PACKET.HeaderChecksum], 0 ; clear checksum field - need to when |
261 | hidnplayr | 128 | ; recalculating checksum |
1 | ha | 129 | ; this needs two data pointers and two size #. |
130 | ; 2nd pointer can be of length 0 |
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131 | |||
261 | hidnplayr | 132 | GET_IHL ecx, ebx + IP_PACKET.VersionAndIHL ;get packet length in ecx |
133 | stdcall checksum_jb, ebx, ecx ;buf_ptr, buf_size |
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134 | cmp dx, ax |
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1 | ha | 135 | |
914 | serge | 136 | ; DEBUGF 1, "K : ip_rx - checksums: %x - %x\n", dx, ax |
137 | |||
138 | jnz .dump.1 ;if CHECKSUM isn't valid then dump packet |
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261 | hidnplayr | 139 | mov edx, ebx ; EDX (IP-BUFFER POINTER) WILL BE USED FOR *_rx HANDLERS BELOW!!! |
140 | |||
914 | serge | 141 | ; DEBUGF 1, "K : ip_rx - dest: %x - %x\n", [ebx + IP_PACKET.DestinationAddress], [stack_ip] |
142 | |||
261 | hidnplayr | 143 | ; Validate the IP address, if it isn't broadcast |
144 | mov eax, [stack_ip] |
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145 | cmp dword[ebx + IP_PACKET.DestinationAddress], eax |
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146 | je @f |
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147 | |||
1 | ha | 148 | ; If the IP address is 255.255.255.255, accept it |
149 | ; - it is a broadcast packet, which we need for dhcp |
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150 | |||
914 | serge | 151 | mov eax, [ebx + IP_PACKET.DestinationAddress] |
152 | cmp eax, 0xffffffff |
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153 | ;je @f |
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154 | ;mov ecx, [stack_ip] |
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155 | ;and eax, [subnet_mask] |
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156 | ;and ecx, [subnet_mask] |
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157 | ;cmp eax, ecx |
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158 | ;jne .dump.2 |
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159 | ;mov eax, [ebx + IP_PACKET.DestinationAddress] |
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160 | ;or eax, [subnet_mask] |
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161 | ;cmp eax, 0xffffffff |
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162 | jne .dump.2 |
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163 | |||
261 | hidnplayr | 164 | @@: |
165 | mov al, [ebx + IP_PACKET.VersionAndIHL] |
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166 | and al, 0x0f ;get IHL(header length) |
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167 | cmp al, 0x05 ;if IHL!= 5*4(20 bytes) |
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914 | serge | 168 | ; DEBUGF 1, "K : ip_rx - ihl: %x - 05\n", al |
169 | jnz .dump.3 ;then dump it |
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1 | ha | 170 | |
914 | serge | 171 | ; DEBUGF 1, "K : ip_rx - ttl: %x - 00\n", [ebx + IP_PACKET.TimeToLive]:2 |
1 | ha | 172 | |
914 | serge | 173 | cmp [ebx + IP_PACKET.TimeToLive], 0 |
174 | je .dump.4 ;if TTL==0 then dump it |
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175 | |||
176 | mov ax, [ebx + IP_PACKET.FlagsAndFragmentOffset] |
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261 | hidnplayr | 177 | and ax, 0xFFBF ;get flags |
914 | serge | 178 | ; DEBUGF 1, "K : ip_rx - flags: %x - 0000\n", ax |
261 | hidnplayr | 179 | cmp ax, 0 ;if some flags was set then we dump this packet |
914 | serge | 180 | jnz .dump.5 ;the flags should be used for fragmented packets |
1 | ha | 181 | |
182 | ; Check the protocol, and call the appropriate handler |
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183 | ; Each handler will re-use or free the queue buffer as appropriate |
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184 | |||
261 | hidnplayr | 185 | mov al, [ebx + IP_PACKET.Protocol] |
186 | |||
1 | ha | 187 | cmp al , PROTOCOL_TCP |
261 | hidnplayr | 188 | jne .not_tcp |
914 | serge | 189 | ; DEBUGF 1,"K : ip_rx - TCP packet\n" |
261 | hidnplayr | 190 | mov eax, dword[buffer_number] |
1 | ha | 191 | call tcp_rx |
261 | hidnplayr | 192 | jmp .exit |
1 | ha | 193 | |
261 | hidnplayr | 194 | .not_tcp: |
195 | cmp al, PROTOCOL_UDP |
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196 | jne .not_udp |
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914 | serge | 197 | ; DEBUGF 1,"K : ip_rx - UDP packet\n" |
261 | hidnplayr | 198 | mov eax, dword[buffer_number] |
1 | ha | 199 | call udp_rx |
261 | hidnplayr | 200 | jmp .exit |
1 | ha | 201 | |
261 | hidnplayr | 202 | .not_udp: |
914 | serge | 203 | cmp al, PROTOCOL_ICMP |
204 | jne .dump.6 ;protocol ain't supported |
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261 | hidnplayr | 205 | |
914 | serge | 206 | ; DEBUGF 1,"K : ip_rx - ICMP packet\n" |
261 | hidnplayr | 207 | ;GET_IHL ecx, ebx + IP_PACKET.VersionAndIHL ;get packet length in ecx |
208 | mov eax, dword[buffer_number] |
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209 | stdcall icmp_rx,eax,ebx,ecx ;buffer_number,IPPacketBase,IPHeaderLength |
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210 | jmp .exit |
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211 | |||
212 | |||
914 | serge | 213 | .dump.1: |
214 | DEBUGF 1, "K : ip_rx - dumped (checksum: 0x%x-0x%x)\n", dx, ax |
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215 | jmp .dump.x |
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1 | ha | 216 | |
914 | serge | 217 | .dump.2: |
218 | DEBUGF 1, "K : ip_rx - dumped (ip: %u.%u.%u.%u)\n", [ebx + IP_PACKET.DestinationAddress + 0]:1, [ebx + IP_PACKET.DestinationAddress + 1]:1, [ebx + IP_PACKET.DestinationAddress + 2]:1, [ebx + IP_PACKET.DestinationAddress + 3]:1 |
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219 | jmp .dump.x |
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1 | ha | 220 | |
914 | serge | 221 | .dump.3: |
222 | DEBUGF 1, "K : ip_rx - dumped (ihl: %u)\n", al |
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223 | jmp .dump.x |
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224 | |||
225 | .dump.4: |
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2971 | Serge | 226 | DEBUGF 1, "K : ip_rx - dumped (ttl: %u)\n", [ebx + IP_PACKET.TimeToLive] |
914 | serge | 227 | jmp .dump.x |
228 | |||
229 | .dump.5: |
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230 | DEBUGF 1, "K : ip_rx - dumped (flags: 0x%x)\n", ax |
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231 | jmp .dump.x |
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232 | |||
233 | .dump.6: |
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234 | DEBUGF 1, "K : ip_rx - dumped (proto: %u)\n", [ebx + IP_PACKET.Protocol]:1 |
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235 | |||
236 | .dump.x: |
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237 | inc dword[dumped_rx_count] |
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238 | mov eax, [buffer_number] |
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1 | ha | 239 | call freeBuff |
240 | |||
261 | hidnplayr | 241 | .exit: |
1 | ha | 242 | ret |
261 | hidnplayr | 243 | endp><> |
1 | ha | 244 |