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Rev | Author | Line No. | Line |
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1 | ha | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; TCP.INC ;; |
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4 | ;; ;; |
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5 | ;; TCP Processes for Menuet OS TCP/IP stack ;; |
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6 | ;; ;; |
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7 | ;; Version 0.6 4th July 2004 ;; |
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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 | ;; v0.6 : Added reset handling in the established state ;; |
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13 | ;; Added a timer per socket to allow delays when rx window ;; |
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14 | ;; gets below 1KB ;; |
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15 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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16 | |||
261 | hidnplayr | 17 | ; TCP TCB states |
18 | TCB_LISTEN equ 1 |
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19 | TCB_SYN_SENT equ 2 |
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20 | TCB_SYN_RECEIVED equ 3 |
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21 | TCB_ESTABLISHED equ 4 |
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22 | TCB_FIN_WAIT_1 equ 5 |
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23 | TCB_FIN_WAIT_2 equ 6 |
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24 | TCB_CLOSE_WAIT equ 7 |
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25 | TCB_CLOSING equ 8 |
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26 | TCB_LAST_ACK equ 9 |
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27 | TCB_TIME_WAIT equ 10 |
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28 | TCB_CLOSED equ 11 |
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1 | ha | 29 | |
261 | hidnplayr | 30 | TWOMSL equ 10 ; # of secs to wait before closing socket |
31 | |||
32 | TCP_RETRIES equ 5 ; Number of times to resend a packet |
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33 | TCP_TIMEOUT equ 10 ; resend if not replied to in x hs |
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34 | |||
1 | ha | 35 | ;******************************************************************* |
36 | ; Interface |
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37 | ; |
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38 | ; tcp_tx_handler Handles the TCP transmit queue |
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39 | ; tcp_rx The protocol handler for received data |
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40 | ; buildTCPPacket fills in the packet headers and data |
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41 | ; tcpStateMachine Main state machine for received TCP packets |
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42 | ; tcp_tcb_handler 1s timer, to erase tcb's in TIME_WAIT state |
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43 | ; |
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44 | ;******************************************************************* |
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45 | |||
46 | |||
261 | hidnplayr | 47 | ; TCP Payload ( Data field in IP datagram ) |
48 | ; |
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49 | ; 0 1 2 3 |
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50 | ; 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
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51 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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52 | ;20 | Source Port | Destination Port | |
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53 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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54 | ;24 | Sequence Number | |
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55 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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56 | ;28 | Acknowledgment Number | |
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57 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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58 | ;32 | Data | |U|A|P|R|S|F| | |
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59 | ; | Offset| Reserved |R|C|S|S|Y|I| Window | |
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60 | ; | | |G|K|H|T|N|N| | |
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61 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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62 | ;36 | Checksum | Urgent Pointer | |
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63 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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64 | ;40 | Options | Padding | |
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65 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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66 | ; | data |
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1 | ha | 67 | |
261 | hidnplayr | 68 | |
69 | struc TCP_PACKET |
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70 | { .SourcePort dw ? ;+00 |
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71 | .DestinationPort dw ? ;+02 |
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72 | .SequenceNumber dd ? ;+04 |
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73 | .AckNumber dd ? ;+08 |
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74 | .DataOffset db ? ;+12 - DataOffset[0-3 bits] and Reserved[4-7] |
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75 | .Flags db ? ;+13 - Reserved[0-1 bits]|URG|ACK|PSH|RST|SYN|FIN |
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76 | .Window dw ? ;+14 |
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77 | .Checksum dw ? ;+16 |
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78 | .UrgentPointer dw ? ;+18 |
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79 | .Options rb 3 ;+20 |
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80 | .Padding db ? ;+23 |
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81 | .Data db ? ;+24 |
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82 | } |
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83 | |||
84 | virtual at 0 |
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85 | TCP_PACKET TCP_PACKET |
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86 | end virtual |
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87 | |||
88 | |||
89 | |||
1 | ha | 90 | ;*************************************************************************** |
91 | ; Function |
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92 | ; tcp_tcb_handler |
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93 | ; |
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94 | ; Description |
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95 | ; Handles sockets in the timewait state, closing them |
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96 | ; when the TCB timer expires |
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97 | ; |
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98 | ;*************************************************************************** |
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99 | tcp_tcb_handler: |
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100 | ; scan through all the sockets, decrementing active timers |
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101 | |||
102 | mov eax, SOCKETBUFFSIZE * NUM_SOCKETS |
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103 | mov ecx, NUM_SOCKETS |
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104 | |||
105 | tth1: |
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106 | sub eax, SOCKETBUFFSIZE |
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107 | cmp [eax + sockets + 32], dword 0 |
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108 | jne tth2 |
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109 | |||
110 | tth1a: |
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111 | cmp [eax + sockets + 72], dword 0 |
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112 | jne tth4 |
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113 | |||
114 | loop tth1 |
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115 | ret |
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116 | |||
117 | tth2: |
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118 | ; decrement it, delete socket if TCB timer = 0 & socket in timewait state |
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119 | pusha |
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120 | dec dword [eax + sockets + 32] |
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121 | cmp [eax + sockets + 32], dword 0 |
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122 | jne tth3 |
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123 | |||
124 | cmp [eax + sockets + 28], dword TCB_TIME_WAIT |
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125 | jne tth3 |
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126 | |||
127 | ; OK, delete socket |
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128 | mov edi, eax |
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129 | add edi, sockets |
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130 | |||
131 | xor eax, eax |
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132 | mov ecx, SOCKETHEADERSIZE |
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133 | cld |
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134 | rep stosb |
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135 | |||
136 | tth3: |
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137 | popa |
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138 | |||
139 | jmp tth1a |
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140 | |||
141 | loop tth1 |
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142 | ret |
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143 | |||
144 | ; TODO - prove it works! |
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145 | tth4: |
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146 | dec dword [eax + sockets + 72] |
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147 | loop tth1 |
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148 | ret |
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149 | |||
150 | |||
151 | |||
152 | |||
153 | tth_exit: |
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154 | ret |
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155 | |||
156 | |||
157 | ;*************************************************************************** |
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158 | ; Function |
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159 | ; tcp_tx_handler |
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160 | ; |
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161 | ; Description |
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162 | ; Handles queued TCP data |
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163 | ; This is a kernel function, called by stack_handler |
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164 | ; |
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165 | ;*************************************************************************** |
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166 | tcp_tx_handler: |
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167 | ; decrement all resend buffers timers. If they |
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168 | ; expire, queue them for sending, and restart the timer. |
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169 | ; If the retries counter reach 0, delete the entry |
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170 | |||
171 | mov esi, resendQ |
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172 | mov ecx, 0 |
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173 | |||
174 | tth001: |
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175 | cmp ecx, NUMRESENDENTRIES |
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176 | je tth003 ; None left |
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177 | cmp [esi], byte 0xFF |
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261 | hidnplayr | 178 | jne tth002 ; found one |
1 | ha | 179 | inc ecx |
180 | add esi, 4 |
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181 | jmp tth001 |
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182 | |||
183 | tth002: |
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184 | ; we have one. decrement it's timer by 1 |
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185 | dec word [esi+2] |
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186 | mov ax, [esi+2] |
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187 | cmp ax, 0 |
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261 | hidnplayr | 188 | je tth002a |
1 | ha | 189 | inc ecx |
190 | add esi, 4 |
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191 | jmp tth001 ; Timer not zero, so move on |
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192 | |||
193 | tth002a: |
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194 | mov bl, 0xff |
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195 | ; restart timer, and decrement retries |
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196 | ; After the first resend, back of on next, by a factor of 5 |
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197 | mov [esi+2], word TCP_TIMEOUT * 5 |
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198 | dec byte [esi+1] |
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199 | mov al, [esi+1] |
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200 | cmp al, 0 |
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201 | jne tth004 |
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202 | |||
203 | ; retries now 0, so delete from queue |
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204 | xchg [esi], bl |
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205 | tth004: |
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206 | |||
207 | ; resend packet |
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208 | pusha |
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209 | |||
210 | mov eax, EMPTY_QUEUE |
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211 | call dequeue |
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212 | cmp ax, NO_BUFFER |
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213 | jne tth004z |
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214 | |||
215 | ; TODO - try again in 10ms. |
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216 | cmp bl, 0xff |
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217 | jne tth004za |
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218 | mov [esi], bl |
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219 | |||
220 | tth004za: |
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221 | ; Mark it to expire in 10ms - 1 tick |
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222 | mov [esi+1], byte 1 |
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223 | mov [esi+2], word 1 |
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224 | jmp tth005 |
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225 | |||
226 | tth004z: |
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227 | ; we have a buffer # in ax |
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228 | |||
229 | push eax |
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230 | push ecx |
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231 | mov ecx, IPBUFFSIZE |
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232 | mul ecx |
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233 | add eax, IPbuffs |
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234 | |||
235 | ; we have the buffer address in eax |
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236 | mov edi, eax |
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237 | pop ecx |
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238 | ; get resend data address |
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239 | inc ecx |
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240 | ; Now get buffer location, and copy buffer across. argh! more copying,, |
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241 | mov esi, resendBuffer - IPBUFFSIZE |
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242 | tth004a: |
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243 | add esi, IPBUFFSIZE |
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244 | loop tth004a |
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245 | |||
246 | ; we have resend buffer location in esi |
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247 | mov ecx, IPBUFFSIZE |
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248 | |||
249 | ; copy data across |
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250 | cld |
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251 | rep movsb |
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252 | |||
253 | ; queue packet |
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254 | |||
255 | |||
256 | |||
257 | mov eax, NET1OUT_QUEUE |
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258 | |||
259 | mov edx, [stack_ip] |
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260 | mov ecx, [ edi + 16 ] |
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261 | cmp edx, ecx |
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262 | jne tth004b |
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263 | mov eax, IPIN_QUEUE |
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264 | |||
265 | tth004b: |
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266 | pop ebx |
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267 | |||
268 | call queue |
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269 | |||
270 | |||
271 | tth005: |
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272 | popa |
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273 | |||
274 | inc ecx |
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275 | add esi, 4 |
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276 | jmp tth001 |
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277 | |||
278 | tth003: |
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279 | ret |
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280 | |||
281 | |||
282 | |||
283 | |||
284 | ;*************************************************************************** |
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285 | ; Function |
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286 | ; tcp_rx |
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287 | ; |
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288 | ; Description |
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289 | ; TCP protocol handler |
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290 | ; This is a kernel function, called by ip_rx |
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291 | ; IP buffer address given in edx |
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292 | ; IP buffer number in eax |
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293 | ; Free up (or re-use) IP buffer when finished |
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294 | ; |
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295 | ;*************************************************************************** |
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296 | tcp_rx: |
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297 | ; The process is as follows. |
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298 | ; Look for a socket with matching remote IP, remote port, local port |
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299 | ; if not found, then |
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300 | ; look for remote IP + local port match ( where sockets remote port = 0) |
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301 | ; if not found, then |
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302 | ; look for a socket where local socket port == IP packets remote port |
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303 | ; where sockets remote port, remote IP = 0 |
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304 | ; discard if not found |
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305 | ; Call sockets tcbStateMachine, with pointer to packet. |
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306 | ; the state machine will not delete the packet, so do that here. |
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307 | |||
308 | push eax |
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309 | |||
310 | ; Look for a socket where |
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311 | ; IP Packet TCP Destination Port = local Port |
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312 | ; IP Packet SA = Remote IP |
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313 | ; IP Packet TCP Source Port = remote Port |
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314 | |||
315 | mov eax, SOCKETBUFFSIZE * NUM_SOCKETS |
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316 | mov ecx, NUM_SOCKETS |
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317 | ss1: |
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318 | sub eax, SOCKETBUFFSIZE |
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319 | movzx ebx, word [edx + 22] ; get the dest. port from the TCP hdr |
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320 | cmp [eax + sockets + 12], bx ; compare with socket's local port |
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321 | jnz nxttst1 ; different - try next socket |
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322 | |||
323 | movzx ebx, word [edx + 20] ; get the source port from the TCP hdr |
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324 | cmp [eax + sockets + 20], bx ; compare with socket's remote port |
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325 | jnz nxttst1 ; different - try next socket |
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326 | |||
327 | |||
328 | mov ebx, [edx + 12] ; get the source IP Addr from the IP hdr |
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329 | cmp [eax + sockets + 16], ebx ; compare with socket's remote IP |
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330 | jnz nxttst1 ; different - try next socket |
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331 | |||
332 | ; We have a complete match - use this socket |
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333 | jmp tcprx_001 |
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334 | |||
335 | nxttst1: |
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336 | loop ss1 ; Return back if no match |
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337 | |||
338 | ; If we got here, there was no match |
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339 | ; Look for a socket where |
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340 | ; IP Packet TCP Destination Port = local Port |
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341 | ; IP Packet SA = Remote IP |
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342 | ; socket remote Port = 0 |
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343 | |||
344 | mov eax, SOCKETBUFFSIZE * NUM_SOCKETS |
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345 | mov ecx, NUM_SOCKETS |
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346 | |||
347 | ss2: |
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348 | sub eax, SOCKETBUFFSIZE |
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349 | |||
350 | movzx ebx, word [edx + 22] ; get the dest. port from the TCP hdr |
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351 | cmp [eax + sockets + 12], bx ; compare with socket's local port |
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352 | jnz nxttst2 ; different - try next socket |
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353 | |||
354 | mov ebx, [edx + 12] ; get the source IP Addr from the IP hdr |
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355 | cmp [eax + sockets + 16], ebx ; compare with socket's remote IP |
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356 | jnz nxttst2 ; different - try next socket |
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357 | |||
358 | mov ebx, 0 |
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359 | cmp [eax + sockets + 20], bx ; only match a remote socket of 0 |
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360 | jnz nxttst2 ; different - try next socket |
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361 | |||
362 | ; We have a complete match - use this socket |
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363 | jmp tcprx_001 |
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364 | |||
365 | nxttst2: |
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366 | loop ss2 ; Return back if no match |
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367 | |||
368 | ; If we got here, there was no match |
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369 | ; Look for a socket where |
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370 | ; IP Packet TCP Destination Port = local Port |
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371 | ; socket Remote IP = 0 |
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372 | ; socket remote Port = 0 |
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373 | |||
374 | mov eax, SOCKETBUFFSIZE * NUM_SOCKETS |
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375 | mov ecx, NUM_SOCKETS |
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376 | |||
377 | ss3: |
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378 | sub eax, SOCKETBUFFSIZE |
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379 | |||
380 | movzx ebx, word [edx + 22] ; get destination port from the TCP hdr |
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381 | cmp [eax + sockets + 12], bx ; compare with socket's local port |
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382 | jnz nxttst3 ; different - try next socket |
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383 | |||
384 | mov ebx, 0 |
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385 | cmp [eax + sockets + 20], bx ; only match a remote socket of 0 |
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386 | jnz nxttst3 ; different - try next socket |
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387 | |||
388 | mov ebx, 0 |
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389 | cmp [eax + sockets + 16], ebx ; only match a socket remote IP of 0 |
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390 | jnz nxttst3 ; different - try next socket |
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391 | |||
392 | ; We have a complete match - use this socket |
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393 | jmp tcprx_001 |
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394 | |||
395 | nxttst3: |
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396 | loop ss3 ; Return back if no match |
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397 | |||
398 | ; If we got here, we need to reject the packet |
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399 | inc dword [dumped_rx_count] |
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400 | jmp tcprx_exit |
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401 | |||
402 | tcprx_001: |
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403 | ; We have a valid socket/TCB, so call the TCB State Machine for that skt. |
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404 | ; socket is pointed to by [eax + sockets] |
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405 | ; IP packet is pointed to by [edx] |
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406 | ; IP buffer number is on stack ( it will be popped at the end) |
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407 | call tcpStateMachine |
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408 | |||
409 | tcprx_exit: |
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410 | pop eax |
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411 | call freeBuff |
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412 | |||
413 | ret |
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414 | |||
415 | |||
416 | |||
417 | ;*************************************************************************** |
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418 | ; Function |
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419 | ; buildTCPPacket |
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420 | ; |
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421 | ; Description |
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422 | ; builds an IP Packet with TCP data fully populated for transmission |
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423 | ; You may destroy any and all registers |
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424 | ; TCP control flags specified in bl |
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425 | ; This TCB is in [sktAddr] |
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426 | ; User data pointed to by esi |
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427 | ; Data length in ecx |
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428 | ; Transmit buffer number in eax |
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429 | ; |
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430 | ;*************************************************************************** |
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431 | buildTCPPacket: |
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432 | push ecx ; Save data length |
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433 | |||
434 | ; convert buffer pointer eax to the absolute address |
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435 | mov ecx, IPBUFFSIZE |
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436 | mul ecx |
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437 | add eax, IPbuffs |
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438 | |||
439 | mov edx, eax |
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440 | |||
441 | mov [edx + 33], bl ; TCP flags |
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442 | |||
443 | mov ebx, [sktAddr] |
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444 | |||
445 | ; So, ebx holds the socket ptr, edx holds the IPbuffer ptr |
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446 | |||
447 | ; Fill in the IP header ( some data is in the socket descriptor) |
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448 | mov eax, [ebx + 8] |
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449 | mov [edx + 12], eax ; source IP |
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450 | mov eax, [ebx + 16] |
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451 | mov [edx + 16], eax ; Destination IP |
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452 | |||
453 | mov al, 0x45 |
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454 | mov [edx], al ; Version, IHL |
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455 | xor al, al |
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456 | mov [edx + 1], al ; Type of service |
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457 | |||
458 | pop eax ; Get the TCP data length |
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459 | push eax |
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460 | |||
461 | add eax, 20 + 20 ; add IP header and TCP header lengths |
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462 | mov [edx + 2], ah |
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463 | mov [edx + 3], al |
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464 | xor al, al |
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465 | mov [edx + 4], al |
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466 | mov [edx + 5], al |
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467 | mov al, 0x40 |
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468 | mov [edx + 6], al |
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469 | xor al, al |
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470 | mov [edx + 7], al |
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471 | mov al, 0x20 |
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472 | mov [edx + 8], al |
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473 | mov al, 6 ; TCP protocol |
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474 | mov [edx + 9], al |
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475 | |||
476 | ; Checksum left unfilled |
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477 | xor ax, ax |
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478 | mov [edx + 10], ax |
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479 | |||
480 | ; Fill in the TCP header ( some data is in the socket descriptor) |
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481 | mov ax, [ebx + 12] |
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482 | mov [edx + 20], ax ; Local Port |
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483 | |||
484 | mov ax, [ebx + 20] |
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485 | mov [edx + 20 + 2], ax ; desitination Port |
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486 | |||
487 | ; Checksum left unfilled |
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488 | xor ax, ax |
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489 | mov [edx + 20 + 16], ax |
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490 | |||
491 | ; sequence number |
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492 | mov eax, [ebx + 48] |
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493 | mov [edx + 20 + 4], eax |
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494 | |||
495 | ; ack number |
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496 | mov eax, [ebx + 56] |
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497 | mov [edx + 20 + 8], eax |
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498 | |||
499 | ; window ( 0x2000 is default ).I could accept 4KB, fa0, ( skt buffer size) |
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500 | ; 768 bytes seems better |
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501 | mov ax, 0x0003 |
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502 | mov [edx + 20 + 14], ax |
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503 | |||
504 | ; Urgent pointer (0) |
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505 | mov ax, 0 |
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506 | mov [edx + 20 + 18], ax |
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507 | |||
508 | ; data offset ( 0x50 ) |
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509 | mov al, 0x50 |
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510 | mov [edx + 20 + 12], al |
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511 | |||
512 | pop ecx ; count of bytes to send |
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513 | mov ebx, ecx ; need the length later |
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514 | |||
515 | cmp ebx, 0 |
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516 | jz btp_001 |
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517 | |||
518 | mov edi, edx |
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519 | add edi, 40 |
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520 | cld |
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521 | rep movsb ; copy the data across |
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522 | |||
523 | btp_001: |
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524 | ; we have edx as IPbuffer ptr. |
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525 | ; Fill in the TCP checksum |
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526 | ; First, fill in pseudoheader |
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527 | mov eax, [edx + 12] |
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528 | mov [pseudoHeader], eax |
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529 | mov eax, [edx + 16] |
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530 | mov [pseudoHeader+4], eax |
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531 | mov ax, 0x0600 ; 0 + protocol |
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532 | mov [pseudoHeader+8], ax |
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533 | add ebx, 20 |
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534 | mov eax, ebx |
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535 | mov [pseudoHeader+10], ah |
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536 | mov [pseudoHeader+11], al |
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537 | |||
538 | mov eax, pseudoHeader |
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539 | mov [checkAdd1], eax |
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540 | mov [checkSize1], word 12 |
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541 | mov eax, edx |
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542 | add eax, 20 |
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543 | mov [checkAdd2], eax |
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544 | mov eax, ebx |
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545 | mov [checkSize2], ax |
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546 | |||
547 | call checksum |
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548 | |||
549 | ; store it in the TCP checksum ( in the correct order! ) |
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550 | mov ax, [checkResult] |
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551 | |||
552 | mov [edx + 20 + 16], ah |
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553 | mov [edx + 20 + 17], al |
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554 | |||
555 | ; Fill in the IP header checksum |
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261 | hidnplayr | 556 | GET_IHL eax,edx ; get IP-Header length |
557 | stdcall checksum_jb,edx,eax ; buf_ptr, buf_size |
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1 | ha | 558 | |
559 | mov [edx + 10], ah |
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560 | mov [edx + 11], al |
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561 | |||
562 | ret |
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563 | |||
564 | |||
565 | ; Increments the 32 bit value pointed to by esi in internet order |
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566 | inc_inet_esi: |
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567 | push eax |
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568 | add esi, 3 |
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569 | mov al, byte[esi] |
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570 | inc al |
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571 | mov byte[esi], al |
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572 | cmp al, 0 |
||
573 | jnz iie_exit |
||
574 | dec esi |
||
575 | mov al, byte[esi] |
||
576 | inc al |
||
577 | mov byte[esi], al |
||
578 | cmp al, 0 |
||
579 | jnz iie_exit |
||
580 | dec esi |
||
581 | mov al, byte[esi] |
||
582 | inc al |
||
583 | mov byte[esi], al |
||
584 | cmp al, 0 |
||
585 | jnz iie_exit |
||
586 | dec esi |
||
587 | mov al, byte[esi] |
||
588 | inc al |
||
589 | mov byte[esi], al |
||
590 | |||
591 | iie_exit: |
||
592 | pop eax |
||
593 | ret |
||
594 | |||
595 | |||
596 | ; Increments the 32 bit value pointed to by esi in internet order |
||
597 | ; by the value in ecx |
||
598 | add_inet_esi: |
||
599 | push eax |
||
600 | |||
601 | mov al, [esi] |
||
602 | shl eax, 8 |
||
603 | inc esi |
||
604 | mov al, [esi] |
||
605 | shl eax, 8 |
||
606 | inc esi |
||
607 | mov al, [esi] |
||
608 | shl eax, 8 |
||
609 | inc esi |
||
610 | mov al, [esi] |
||
611 | add eax, ecx |
||
612 | mov [esi], al |
||
613 | dec esi |
||
614 | shr eax, 8 |
||
615 | mov [esi], al |
||
616 | dec esi |
||
617 | shr eax, 8 |
||
618 | mov [esi], al |
||
619 | dec esi |
||
620 | shr eax, 8 |
||
621 | mov [esi], al |
||
622 | pop eax |
||
623 | ret |
||
624 | |||
625 | |||
626 | iglobal |
||
627 | TCBStateHandler: |
||
628 | dd stateTCB_LISTEN |
||
629 | dd stateTCB_SYN_SENT |
||
630 | dd stateTCB_SYN_RECEIVED |
||
631 | dd stateTCB_ESTABLISHED |
||
632 | dd stateTCB_FIN_WAIT_1 |
||
633 | dd stateTCB_FIN_WAIT_2 |
||
634 | dd stateTCB_CLOSE_WAIT |
||
635 | dd stateTCB_CLOSING |
||
636 | dd stateTCB_LAST_ACK |
||
637 | dd stateTCB_TIME_WAIT |
||
638 | dd stateTCB_CLOSED |
||
639 | endg |
||
640 | |||
641 | ;*************************************************************************** |
||
642 | ; Function |
||
643 | ; tcpStateMachine |
||
644 | ; |
||
645 | ; Description |
||
646 | ; TCP state machine |
||
647 | ; This is a kernel function, called by tcp_rx |
||
648 | ; |
||
649 | ; IP buffer address given in edx |
||
650 | ; Socket/TCB address in [eax + sockets] |
||
651 | ; |
||
652 | ; The IP buffer will be released by the caller |
||
653 | ;*************************************************************************** |
||
654 | tcpStateMachine: |
||
655 | mov ebx, sockets |
||
656 | add ebx, eax |
||
657 | mov [sktAddr], ebx |
||
658 | |||
659 | ; as a packet has been received, update the TCB timer |
||
660 | mov ecx, TWOMSL |
||
661 | mov [ebx + 32], ecx |
||
662 | |||
663 | ; If the received packet has an ACK bit set, |
||
664 | ; remove any packets in the resend queue that this |
||
665 | ; received packet acknowledges |
||
666 | pusha |
||
667 | mov cl, [edx + 33] |
||
668 | and cl, 0x10 |
||
669 | cmp cl, 0x10 |
||
670 | jne tsm001 ; No ACK, so no data yet |
||
671 | |||
672 | |||
673 | ; get skt number in al |
||
674 | shr eax, 12 |
||
675 | |||
676 | ; The ack number is in [edx + 28], inet format |
||
677 | ; skt in al |
||
678 | |||
679 | mov esi, resendQ |
||
680 | mov ecx, 0 |
||
681 | |||
682 | t001: |
||
683 | cmp ecx, NUMRESENDENTRIES |
||
684 | je t003 ; None left |
||
685 | cmp [esi], al |
||
686 | je t002 ; found one |
||
687 | inc ecx |
||
688 | add esi, 4 |
||
689 | jmp t001 |
||
690 | |||
691 | t002: ; Can we delete this buffer? |
||
692 | |||
693 | ; If yes, goto t004. No, goto t001 |
||
694 | ; Get packet data address |
||
695 | |||
696 | push ecx |
||
697 | inc ecx |
||
698 | ; Now get buffer location, and copy buffer across. argh! more copying,, |
||
699 | mov edi, resendBuffer - IPBUFFSIZE |
||
700 | t002a: |
||
701 | add edi, IPBUFFSIZE |
||
702 | loop t002a |
||
703 | |||
704 | ; we have dest buffer location in edi. incoming packet in edx. |
||
705 | ; Get this packets sequence number |
||
706 | ; preserve al, ecx, esi, edx |
||
707 | |||
708 | mov cl, [edi + 24] |
||
709 | shl ecx, 8 |
||
710 | mov cl, [edi + 25] |
||
711 | shl ecx, 8 |
||
712 | mov cl, [edi + 26] |
||
713 | shl ecx, 8 |
||
714 | mov cl, [edi + 27] |
||
715 | movzx ebx, byte [edi + 3] |
||
716 | mov bh, [edi + 2] |
||
717 | sub ebx, 40 |
||
718 | add ecx, ebx ; ecx is now seq# of last byte +1, intel format |
||
719 | |||
720 | ; get recievd ack #, in intel format |
||
721 | mov bl, [edx + 28] |
||
722 | shl ebx, 8 |
||
723 | mov bl, [edx + 29] |
||
724 | shl ebx, 8 |
||
725 | mov bl, [edx + 30] |
||
726 | shl ebx, 8 |
||
727 | mov bl, [edx + 31] |
||
728 | |||
729 | cmp ebx, ecx ; Finally. ecx = rx'ed ack. ebx = last byte in que |
||
730 | ; DANGER! need to handle case that we have just |
||
731 | ; passed the 2**32, and wrapped round! |
||
732 | pop ecx |
||
733 | |||
734 | jae t004 ; if rx > old, delete old |
||
735 | inc ecx |
||
736 | add esi, 4 |
||
737 | jmp t001 |
||
738 | |||
739 | |||
740 | t004: |
||
741 | dec dword [arp_rx_count] ; ************ TEST ONLY! |
||
742 | |||
743 | mov [esi], byte 0xFF |
||
744 | inc ecx |
||
745 | add esi, 4 |
||
746 | jmp t001 |
||
747 | |||
748 | t003: |
||
749 | |||
750 | tsm001: |
||
751 | popa |
||
752 | |||
753 | ; Call handler for given TCB state |
||
754 | mov ebx, [eax + sockets+28] |
||
755 | cmp ebx, TCB_LISTEN |
||
756 | jb tsm_exit |
||
757 | cmp ebx, TCB_CLOSED |
||
758 | ja tsm_exit |
||
759 | |||
760 | dec ebx |
||
761 | call dword [TCBStateHandler+ebx*4] |
||
762 | |||
763 | tsm_exit: |
||
764 | ret |
||
765 | |||
766 | |||
767 | |||
768 | stateTCB_LISTEN: |
||
769 | ; In this case, we are expecting a SYN packet |
||
770 | ; For now, if the packet is a SYN, process it, and send a response |
||
771 | ; If not, ignore it |
||
772 | |||
773 | ; Look at control flags |
||
774 | mov bl, [edx + 33] |
||
775 | and bl, 0x02 |
||
776 | cmp bl, 0x02 |
||
777 | jnz stl_exit |
||
778 | |||
779 | ; We have a SYN. update the socket with this IP packets details, |
||
780 | ; And send a response |
||
781 | |||
782 | mov ebx, [edx + 12] ; IP source address |
||
783 | mov [eax + sockets + 16], ebx |
||
784 | mov bx, [edx + 20] ; IP source port |
||
785 | mov [eax + sockets + 20], bx |
||
786 | mov ebx, [edx + 24] ; IRS |
||
787 | mov [eax + sockets + 40], ebx |
||
788 | mov [eax + sockets + 56], ebx |
||
789 | mov esi, sockets |
||
790 | add esi, eax |
||
791 | add esi, 56 |
||
792 | call inc_inet_esi ; RCV.NXT |
||
793 | mov ebx, [eax + sockets + 36] ; ISS |
||
794 | mov [eax + sockets + 48], ebx ; SND.NXT |
||
795 | |||
796 | ; Now construct the response, and queue for sending by IP |
||
797 | mov eax, EMPTY_QUEUE |
||
798 | call dequeue |
||
799 | cmp ax, NO_BUFFER |
||
800 | je stl_exit |
||
801 | |||
802 | push eax |
||
803 | mov bl, 0x12 ; SYN + ACK |
||
804 | mov ecx, 0 |
||
805 | mov esi, 0 |
||
806 | |||
807 | call buildTCPPacket |
||
808 | |||
809 | mov eax, NET1OUT_QUEUE |
||
810 | mov edx, [stack_ip] |
||
811 | mov ecx, [ sktAddr ] |
||
812 | mov ecx, [ ecx + 16 ] |
||
813 | cmp edx, ecx |
||
814 | jne stl_notlocal |
||
815 | mov eax, IPIN_QUEUE |
||
816 | |||
817 | stl_notlocal: |
||
818 | ; Send it. |
||
819 | pop ebx |
||
820 | call queue |
||
821 | |||
822 | |||
823 | mov ebx, TCB_SYN_RECEIVED |
||
824 | mov esi, [sktAddr] |
||
825 | mov [esi + 28], ebx |
||
826 | |||
827 | ; increament SND.NXT in socket |
||
828 | add esi, 48 |
||
829 | call inc_inet_esi |
||
830 | |||
831 | stl_exit: |
||
832 | ret |
||
833 | |||
834 | |||
835 | |||
836 | stateTCB_SYN_SENT: |
||
837 | ; We are awaiting an ACK to our SYN, with a SYM |
||
838 | ; Look at control flags - expecting an ACK |
||
839 | mov bl, [edx + 33] |
||
840 | and bl, 0x12 |
||
841 | cmp bl, 0x12 |
||
842 | jnz stss_exit |
||
843 | |||
844 | mov ebx, TCB_ESTABLISHED |
||
845 | mov esi, [sktAddr] |
||
846 | mov [esi + 28], ebx |
||
847 | |||
848 | ; Store the recv.nxt field |
||
849 | mov eax, [edx + 24] |
||
850 | |||
851 | ; Update our recv.nxt field |
||
852 | mov esi, [sktAddr] |
||
853 | add esi, 56 |
||
854 | mov [esi], eax |
||
855 | call inc_inet_esi |
||
856 | |||
857 | ; Send an ACK |
||
858 | ; Now construct the response, and queue for sending by IP |
||
859 | mov eax, EMPTY_QUEUE |
||
860 | call dequeue |
||
861 | cmp ax, NO_BUFFER |
||
862 | je stss_exit |
||
863 | |||
864 | push eax |
||
865 | |||
866 | mov bl, 0x10 ; ACK |
||
867 | mov ecx, 0 |
||
868 | mov esi, 0 |
||
869 | |||
870 | call buildTCPPacket |
||
871 | |||
872 | mov eax, NET1OUT_QUEUE |
||
873 | |||
874 | mov edx, [stack_ip] |
||
875 | mov ecx, [ sktAddr ] |
||
876 | mov ecx, [ ecx + 16 ] |
||
877 | cmp edx, ecx |
||
878 | jne stss_notlocal |
||
879 | mov eax, IPIN_QUEUE |
||
880 | |||
881 | stss_notlocal: |
||
882 | ; Send it. |
||
883 | pop ebx |
||
884 | call queue |
||
885 | |||
886 | stss_exit: |
||
887 | ret |
||
888 | |||
889 | |||
890 | |||
891 | stateTCB_SYN_RECEIVED: |
||
892 | ; In this case, we are expecting an ACK packet |
||
893 | ; For now, if the packet is an ACK, process it, |
||
894 | ; If not, ignore it |
||
895 | |||
896 | ; Look at control flags - expecting an ACK |
||
897 | mov bl, [edx + 33] |
||
898 | and bl, 0x10 |
||
899 | cmp bl, 0x10 |
||
900 | jnz stsr_exit |
||
901 | |||
902 | mov ebx, TCB_ESTABLISHED |
||
903 | mov esi, [sktAddr] |
||
904 | mov [esi + 28], ebx |
||
905 | |||
906 | stsr_exit: |
||
907 | ret |
||
908 | |||
909 | |||
910 | |||
911 | stateTCB_ESTABLISHED: |
||
912 | ; Here we are expecting data, or a request to close |
||
913 | ; OR both... |
||
914 | |||
915 | ; Did we receive a FIN or RST? |
||
916 | mov bl, [edx + 33] |
||
917 | and bl, 0x05 |
||
918 | cmp bl, 0 |
||
919 | je ste_chkack |
||
920 | |||
921 | ; It was a fin or reset. |
||
922 | |||
923 | ; Remove resend entries from the queue - I dont want to send any more data |
||
924 | pusha |
||
925 | |||
926 | mov ebx, [sktAddr] |
||
927 | sub ebx, sockets |
||
928 | shr ebx, 12 ; get skt # |
||
929 | |||
930 | mov esi, resendQ |
||
931 | mov ecx, 0 |
||
932 | |||
933 | ste001: |
||
934 | cmp ecx, NUMRESENDENTRIES |
||
935 | je ste003 ; None left |
||
936 | cmp [esi], bl |
||
937 | je ste002 ; found one |
||
938 | inc ecx |
||
939 | add esi, 4 |
||
940 | jmp ste001 |
||
941 | |||
942 | ste002: |
||
943 | dec dword [arp_rx_count] ; ************ TEST ONLY! |
||
944 | |||
945 | mov [esi], byte 0xFF |
||
946 | jmp ste001 |
||
947 | |||
948 | ste003: |
||
949 | popa |
||
950 | |||
951 | ; was it a reset? |
||
952 | mov bl, [edx + 33] |
||
953 | and bl, 0x04 |
||
954 | cmp bl, 0x04 |
||
955 | jne ste003a |
||
956 | |||
957 | mov esi, [sktAddr] |
||
958 | mov ebx, TCB_CLOSED |
||
959 | mov [esi + 28], ebx |
||
960 | jmp ste_exit |
||
961 | |||
962 | ste003a: |
||
963 | ; Send an ACK to that fin, and enter closewait state |
||
964 | |||
965 | mov esi, [sktAddr] |
||
966 | mov ebx, TCB_CLOSE_WAIT |
||
967 | mov [esi + 28], ebx |
||
968 | add esi, 56 |
||
969 | mov eax, [esi] ; save original |
||
970 | call inc_inet_esi |
||
971 | ;; jmp ste_ack - NO, there may be data |
||
972 | |||
973 | ste_chkack: |
||
974 | ; Check that we received an ACK |
||
975 | mov bl, [edx + 33] |
||
976 | and bl, 0x10 |
||
977 | cmp bl, 0x10 |
||
978 | jnz ste_exit |
||
979 | |||
980 | |||
981 | ; TODO - done, I think! |
||
982 | ; First, look at the incoming window. If this is less than or equal to 1024, |
||
983 | ; Set the socket window timer to 1. This will stop an additional packets being |
||
984 | ; queued. |
||
985 | ; ** I may need to tweak this value, since I do not know how many packets are already queued |
||
986 | mov ch, [edx + 34] |
||
987 | mov cl, [edx + 35] |
||
988 | cmp cx, 1024 |
||
989 | ja ste004 |
||
990 | |||
991 | mov ecx, [sktAddr] |
||
992 | mov [ecx+72], dword 1 |
||
993 | |||
994 | ste004: |
||
995 | |||
996 | ; OK, here is the deal |
||
997 | ; My recv.nct field holds the seq of the expected next rec byte |
||
998 | ; if the recevied sequence number is not equal to this, do not |
||
999 | ; increment the recv.nxt field, do not copy data - just send a |
||
1000 | ; repeat ack. |
||
1001 | |||
1002 | ; recv.nxt is in dword [edx+24], in inext format |
||
1003 | ; recv seq is in [sktAddr]+56, in inet format |
||
1004 | ; just do a comparision |
||
1005 | mov ecx, [sktAddr] |
||
1006 | add ecx, 56 |
||
1007 | |||
1008 | cmp [ecx - 56 + 28], dword TCB_CLOSE_WAIT |
||
1009 | mov ecx, [ecx] |
||
1010 | jne stenofin |
||
1011 | mov ecx, eax |
||
1012 | |||
1013 | stenofin: |
||
1014 | cmp ecx, [edx+24] |
||
1015 | jne ste_ack |
||
1016 | |||
1017 | |||
1018 | ; Read the data bytes, store in socket buffer |
||
1019 | xor ecx, ecx |
||
1020 | mov ch, [edx + 2] |
||
1021 | mov cl, [edx + 3] |
||
1022 | sub ecx, 40 ; Discard 40 bytes of header |
||
1023 | |||
1024 | cmp ecx, 0 |
||
1025 | jnz ste_data ; Read data, if any |
||
1026 | |||
1027 | ; If we had received a fin, we need to ACK it. |
||
1028 | mov esi, [sktAddr] |
||
1029 | mov ebx, [esi + 28] |
||
1030 | cmp ebx, TCB_CLOSE_WAIT |
||
1031 | jz ste_ack |
||
1032 | jnz ste_exit |
||
1033 | |||
1034 | ste_data: |
||
1035 | push ecx |
||
1036 | mov esi, [sktAddr] |
||
1037 | |||
1038 | add [esi + 24], ecx ; increment the count of bytes in buffer |
||
1039 | |||
1040 | mov eax, [esi + 4] ; get socket owner PID |
||
1041 | push eax |
||
1042 | |||
1043 | mov eax, [esi + 24] ; get # of bytes already in buffer |
||
1044 | |||
1045 | ; point to the location to store the data |
||
1046 | add esi, eax |
||
1047 | sub esi, ecx |
||
1048 | add esi, SOCKETHEADERSIZE |
||
1049 | |||
1050 | add edx, 40 ; edx now points to the data |
||
1051 | mov edi, esi |
||
1052 | mov esi, edx |
||
1053 | |||
1054 | cld |
||
1055 | rep movsb ; copy the data across |
||
1056 | |||
1057 | ; flag an event to the application |
||
1058 | pop eax |
||
1059 | mov ecx,1 |
||
115 | poddubny | 1060 | mov esi,0x3020+TASKDATA.pid |
1 | ha | 1061 | |
1062 | news: |
||
1063 | cmp [esi],eax |
||
1064 | je foundPID1 |
||
1065 | inc ecx |
||
1066 | add esi,0x20 |
||
1067 | cmp ecx,[0x3004] |
||
1068 | jbe news |
||
1069 | |||
1070 | foundPID1: |
||
1071 | shl ecx,8 |
||
115 | poddubny | 1072 | or dword [ecx+0x80000+APPDATA.event_mask],dword 10000000b ; stack event |
1 | ha | 1073 | |
1074 | pop ecx |
||
1075 | |||
1076 | ; Update our recv.nxt field |
||
1077 | mov esi, [sktAddr] |
||
1078 | add esi, 56 |
||
1079 | call add_inet_esi |
||
1080 | |||
1081 | ste_ack: |
||
1082 | ; Send an ACK |
||
1083 | ; Now construct the response, and queue for sending by IP |
||
1084 | mov eax, EMPTY_QUEUE |
||
1085 | call dequeue |
||
1086 | cmp ax, NO_BUFFER |
||
1087 | je ste_exit |
||
1088 | |||
1089 | push eax |
||
1090 | |||
1091 | mov bl, 0x10 ; ACK |
||
1092 | mov ecx, 0 |
||
1093 | mov esi, 0 |
||
1094 | |||
1095 | call buildTCPPacket |
||
1096 | |||
1097 | mov eax, NET1OUT_QUEUE |
||
1098 | |||
1099 | mov edx, [stack_ip] |
||
1100 | mov ecx, [ sktAddr ] |
||
1101 | mov ecx, [ ecx + 16 ] |
||
1102 | cmp edx, ecx |
||
1103 | jne ste_notlocal |
||
1104 | mov eax, IPIN_QUEUE |
||
1105 | ste_notlocal: |
||
1106 | |||
1107 | ; Send it. |
||
1108 | pop ebx |
||
1109 | call queue |
||
1110 | |||
1111 | ste_exit: |
||
1112 | ret |
||
1113 | |||
1114 | |||
1115 | |||
1116 | stateTCB_FIN_WAIT_1: |
||
1117 | ; We can either receive an ACK of a fin, or a fin |
||
1118 | mov bl, [edx + 33] |
||
1119 | and bl, 0x10 |
||
1120 | cmp bl, 0x10 |
||
1121 | jnz stfw1_001 |
||
1122 | |||
1123 | ; It was an ACK |
||
1124 | mov esi, [sktAddr] |
||
1125 | mov ebx, TCB_FIN_WAIT_2 |
||
1126 | mov [esi + 28], ebx |
||
1127 | jmp stfw1_exit |
||
1128 | |||
1129 | stfw1_001: |
||
1130 | ; It must be a fin then |
||
1131 | mov esi, [sktAddr] |
||
1132 | mov ebx, TCB_CLOSING |
||
1133 | mov [esi + 28], ebx |
||
1134 | add esi, 56 |
||
1135 | call inc_inet_esi |
||
1136 | |||
1137 | ; Send an ACK |
||
1138 | mov eax, EMPTY_QUEUE |
||
1139 | call dequeue |
||
1140 | cmp ax, NO_BUFFER |
||
1141 | je stfw1_exit |
||
1142 | |||
1143 | push eax |
||
1144 | |||
1145 | mov bl, 0x10 ; ACK |
||
1146 | mov ecx, 0 |
||
1147 | mov esi, 0 |
||
1148 | |||
1149 | call buildTCPPacket |
||
1150 | mov eax, NET1OUT_QUEUE |
||
1151 | |||
1152 | mov edx, [stack_ip] |
||
1153 | mov ecx, [ sktAddr ] |
||
1154 | mov ecx, [ ecx + 16 ] |
||
1155 | cmp edx, ecx |
||
1156 | jne stfw1_notlocal |
||
1157 | mov eax, IPIN_QUEUE |
||
1158 | |||
1159 | stfw1_notlocal: |
||
1160 | ; Send it. |
||
1161 | pop ebx |
||
1162 | call queue |
||
1163 | |||
1164 | stfw1_exit: |
||
1165 | ret |
||
1166 | |||
1167 | |||
1168 | |||
1169 | stateTCB_FIN_WAIT_2: |
||
1170 | mov esi, [sktAddr] |
||
1171 | |||
1172 | ; Get data length |
||
1173 | xor ecx, ecx |
||
1174 | mov ch, [edx+2] |
||
1175 | mov cl, [edx+3] |
||
1176 | sub ecx, 40 |
||
1177 | |||
1178 | mov bl, [edx + 33] |
||
1179 | and bl, 0x01 |
||
1180 | cmp bl, 0x01 |
||
1181 | jne stfw2001 |
||
1182 | |||
1183 | ; Change state, as we have a fin |
||
1184 | mov ebx, TCB_TIME_WAIT |
||
1185 | mov [esi + 28], ebx |
||
1186 | |||
1187 | inc ecx ; FIN is part of the sequence space |
||
1188 | |||
1189 | stfw2001: |
||
1190 | add esi, 56 |
||
1191 | call add_inet_esi |
||
1192 | |||
1193 | ; Send an ACK |
||
1194 | mov eax, EMPTY_QUEUE |
||
1195 | call dequeue |
||
1196 | cmp ax, NO_BUFFER |
||
1197 | je stfw2_exit |
||
1198 | |||
1199 | push eax |
||
1200 | |||
1201 | mov bl, 0x10 ; ACK |
||
1202 | mov ecx, 0 |
||
1203 | mov esi, 0 |
||
1204 | |||
1205 | call buildTCPPacket |
||
1206 | |||
1207 | mov eax, NET1OUT_QUEUE |
||
1208 | |||
1209 | mov edx, [stack_ip] |
||
1210 | mov ecx, [ sktAddr ] |
||
1211 | mov ecx, [ ecx + 16 ] |
||
1212 | cmp edx, ecx |
||
1213 | jne stfw2_notlocal |
||
1214 | mov eax, IPIN_QUEUE |
||
1215 | |||
1216 | stfw2_notlocal: |
||
1217 | ; Send it. |
||
1218 | pop ebx |
||
1219 | call queue |
||
1220 | |||
1221 | ; Only delete the socket if we received the FIN |
||
1222 | |||
1223 | mov bl, [edx + 33] |
||
1224 | and bl, 0x01 |
||
1225 | cmp bl, 0x01 |
||
1226 | jne stfw2_exit |
||
1227 | |||
1228 | ; mov edi, [sktAddr] |
||
1229 | |||
1230 | ; delete the socket. Should really wait for 2MSL |
||
1231 | ; xor eax, eax |
||
1232 | ; mov ecx,SOCKETHEADERSIZE |
||
1233 | ; cld |
||
1234 | ; rep stosb |
||
1235 | |||
1236 | stfw2_exit: |
||
1237 | ret |
||
1238 | |||
1239 | |||
1240 | |||
1241 | stateTCB_CLOSE_WAIT: |
||
1242 | ; Intentionally left empty |
||
1243 | ; socket_close_tcp handles this |
||
1244 | ret |
||
1245 | |||
1246 | |||
1247 | |||
1248 | stateTCB_CLOSING: |
||
1249 | ; We can either receive an ACK of a fin, or a fin |
||
1250 | mov bl, [edx + 33] |
||
1251 | and bl, 0x10 |
||
1252 | cmp bl, 0x10 |
||
1253 | jnz stc_exit |
||
1254 | |||
1255 | ; It was an ACK |
||
1256 | |||
1257 | mov edi, [sktAddr] |
||
1258 | |||
1259 | ; delete the socket |
||
1260 | xor eax, eax |
||
1261 | mov ecx,SOCKETHEADERSIZE |
||
1262 | cld |
||
1263 | rep stosb |
||
1264 | |||
1265 | stc_exit: |
||
1266 | ret |
||
1267 | |||
1268 | |||
1269 | |||
1270 | stateTCB_LAST_ACK: |
||
1271 | ; Look at control flags - expecting an ACK |
||
1272 | mov bl, [edx + 33] |
||
1273 | and bl, 0x10 |
||
1274 | cmp bl, 0x10 |
||
1275 | jnz stla_exit |
||
1276 | |||
1277 | mov edi, [sktAddr] |
||
1278 | |||
1279 | ; delete the socket |
||
1280 | xor eax, eax |
||
1281 | mov ecx,SOCKETHEADERSIZE |
||
1282 | cld |
||
1283 | rep stosb |
||
1284 | |||
1285 | stla_exit: |
||
1286 | ret |
||
1287 | |||
1288 | |||
1289 | |||
1290 | stateTCB_TIME_WAIT: |
||
1291 | ret |
||
1292 | |||
1293 | |||
1294 | |||
1295 | stateTCB_CLOSED: |
||
1296 | ret |