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1196 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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1514 | hidnplayr | 3 | ;; Copyright (C) KolibriOS team 2004-2010. All rights reserved. ;; |
1196 | hidnplayr | 4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
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6 | ;; TCP.INC ;; |
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7 | ;; ;; |
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8 | ;; Part of the tcp/ip network stack for KolibriOS ;; |
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9 | ;; ;; |
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1514 | hidnplayr | 10 | ;; Written by hidnplayr@kolibrios.org ;; |
1196 | hidnplayr | 11 | ;; ;; |
1514 | hidnplayr | 12 | ;; Based on the code of 4.4BSD ;; |
13 | ;; ;; |
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1196 | hidnplayr | 14 | ;; GNU GENERAL PUBLIC LICENSE ;; |
15 | ;; Version 2, June 1991 ;; |
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16 | ;; ;; |
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17 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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1159 | hidnplayr | 18 | |
1206 | hidnplayr | 19 | $Revision: 1534 $ |
1159 | hidnplayr | 20 | |
1514 | hidnplayr | 21 | ; Socket states |
22 | TCB_CLOSED equ 0 |
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23 | TCB_LISTEN equ 1 |
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24 | TCB_SYN_SENT equ 2 |
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25 | TCB_SYN_RECEIVED equ 3 |
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26 | TCB_ESTABLISHED equ 4 |
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27 | TCB_CLOSE_WAIT equ 5 |
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28 | TCB_FIN_WAIT_1 equ 6 |
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29 | TCB_CLOSING equ 7 |
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30 | TCB_LAST_ACK equ 8 |
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31 | TCB_FIN_WAIT_2 equ 9 |
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32 | TCB_TIMED_WAIT equ 10 |
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1196 | hidnplayr | 33 | |
1514 | hidnplayr | 34 | ; Socket Flags |
35 | TF_ACKNOW equ 1 shl 0 ; ack peer immediately |
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36 | TF_DELACK equ 1 shl 1 ; ack, but try to delay it |
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37 | TF_NODELAY equ 1 shl 2 ; don't delay packets to coalesce |
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38 | TF_NOOPT equ 1 shl 3 ; don't use tcp options |
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39 | TF_SENTFIN equ 1 shl 4 ; have sent FIN |
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40 | TF_REQ_SCALE equ 1 shl 5 ; have/will request window scaling |
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41 | TF_RCVD_SCALE equ 1 shl 6 ; other side has requested scaling |
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42 | TF_REQ_TSTMP equ 1 shl 7 ; have/will request timestamps |
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43 | TF_RCVD_TSTMP equ 1 shl 8 ; a timestamp was received in SYN |
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44 | TF_SACK_PERMIT equ 1 shl 9 ; other side said I could SACK |
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1249 | hidnplayr | 45 | |
1514 | hidnplayr | 46 | ; Segment flags |
47 | TH_FIN equ 1 shl 0 |
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48 | TH_SYN equ 1 shl 1 |
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49 | TH_RST equ 1 shl 2 |
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50 | TH_PUSH equ 1 shl 3 |
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51 | TH_ACK equ 1 shl 4 |
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52 | TH_URG equ 1 shl 5 |
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1318 | hidnplayr | 53 | |
1514 | hidnplayr | 54 | ; Segment header options |
55 | TCP_OPT_EOL equ 0 ; End of option list. |
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56 | TCP_OPT_NOP equ 1 ; No-Operation. |
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57 | TCP_OPT_MAXSEG equ 2 ; Maximum Segment Size. |
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58 | TCP_OPT_WINDOW equ 3 ; window scale |
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59 | TCP_OPT_TIMESTAMP equ 8 |
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60 | |||
1519 | hidnplayr | 61 | ; Fundamental timer values |
62 | TCP_time_MSL equ 47 ; max segment lifetime (30s) |
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63 | TCP_time_re_min equ 2 ; min retransmission (1,28s) |
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64 | TCP_time_re_max equ 100 ; max retransmission (64s) |
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65 | TCP_time_pers_min equ 8 ; min persist (5,12s) |
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66 | TCP_time_pers_max equ 94 ; max persist (60,16s) |
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67 | TCP_time_keep_init equ 118 ; connectione stablishment (75,52s) |
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68 | TCP_time_keep_idle equ 4608 ; idle time before 1st probe (2h) |
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69 | TCP_time_keep_interval equ 118 ; between probes when no response (75,52s) |
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70 | TCP_time_rtt_default equ 5 ; default Round Trip Time (3,2s) |
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71 | |||
72 | ; timer constants |
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73 | TCP_max_rxtshift equ 12 ; max retransmissions waiting for ACK |
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74 | TCP_max_keepcnt equ 8 ; max keepalive probes |
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75 | |||
1529 | hidnplayr | 76 | ; |
77 | TCP_max_winshift equ 14 |
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78 | TCP_max_win equ 65535 |
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1519 | hidnplayr | 79 | |
1514 | hidnplayr | 80 | struct TCP_segment |
1159 | hidnplayr | 81 | .SourcePort dw ? |
82 | .DestinationPort dw ? |
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83 | .SequenceNumber dd ? |
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84 | .AckNumber dd ? |
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1196 | hidnplayr | 85 | .DataOffset db ? ; DataOffset[0-3 bits] and Reserved[4-7] |
86 | .Flags db ? ; Reserved[0-1 bits]|URG|ACK|PSH|RST|SYN|FIN |
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1159 | hidnplayr | 87 | .Window dw ? |
88 | .Checksum dw ? |
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89 | .UrgentPointer dw ? |
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1514 | hidnplayr | 90 | .Data: ; ..or options |
1159 | hidnplayr | 91 | ends |
92 | |||
1274 | hidnplayr | 93 | struct tcp_in_queue_entry |
94 | .data_ptr dd ? |
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95 | .data_size dd ? |
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1514 | hidnplayr | 96 | .offset dd ? |
1274 | hidnplayr | 97 | .size: |
98 | ends |
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99 | |||
100 | struct tcp_out_queue_entry |
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101 | .data_ptr dd ? |
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102 | .data_size dd ? |
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1514 | hidnplayr | 103 | |
1274 | hidnplayr | 104 | .size: |
105 | ends |
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106 | |||
1196 | hidnplayr | 107 | align 4 |
108 | uglobal |
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1514 | hidnplayr | 109 | TCP_segments_tx rd IP_MAX_INTERFACES |
110 | TCP_segments_rx rd IP_MAX_INTERFACES |
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111 | TCP_bytes_rx rq IP_MAX_INTERFACES |
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112 | TCP_bytes_tx rq IP_MAX_INTERFACES |
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113 | TCP_sequence_num dd ? |
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1196 | hidnplayr | 114 | endg |
115 | |||
116 | |||
117 | ;----------------------------------------------------------------- |
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118 | ; |
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119 | ; TCP_init |
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120 | ; |
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121 | ; This function resets all TCP variables |
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122 | ; |
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123 | ;----------------------------------------------------------------- |
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1529 | hidnplayr | 124 | macro TCP_init { |
1196 | hidnplayr | 125 | |
126 | xor eax, eax |
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1514 | hidnplayr | 127 | mov edi, TCP_segments_tx |
128 | mov ecx, (6*IP_MAX_INTERFACES) |
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1196 | hidnplayr | 129 | rep stosd |
130 | |||
1529 | hidnplayr | 131 | pseudo_random eax |
132 | mov [TCP_sequence_num], eax |
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1196 | hidnplayr | 133 | |
1529 | hidnplayr | 134 | } |
1196 | hidnplayr | 135 | |
136 | |||
1519 | hidnplayr | 137 | ;---------------------- |
1196 | hidnplayr | 138 | ; |
1159 | hidnplayr | 139 | ; |
1519 | hidnplayr | 140 | ;---------------------- |
1529 | hidnplayr | 141 | macro TCP_timer_160ms { |
1159 | hidnplayr | 142 | |
1529 | hidnplayr | 143 | local .loop |
144 | local .exit |
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145 | |||
1514 | hidnplayr | 146 | mov eax, net_sockets |
147 | .loop: |
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148 | mov eax, [eax + SOCKET.NextPtr] |
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149 | or eax, eax |
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1159 | hidnplayr | 150 | jz .exit |
151 | |||
1514 | hidnplayr | 152 | cmp [eax + SOCKET.Type], IP_PROTO_TCP |
153 | jne .loop |
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1249 | hidnplayr | 154 | |
1519 | hidnplayr | 155 | dec [eax + TCP_SOCKET.timer_ack] |
1514 | hidnplayr | 156 | jnz .loop |
1159 | hidnplayr | 157 | |
1519 | hidnplayr | 158 | DEBUGF 1,"TCP ack for socket %x expired, time to piggyback!\n", eax |
1159 | hidnplayr | 159 | |
1519 | hidnplayr | 160 | push eax |
1529 | hidnplayr | 161 | call TCP_respond_socket |
1514 | hidnplayr | 162 | pop eax |
1159 | hidnplayr | 163 | |
1519 | hidnplayr | 164 | jmp .loop |
1159 | hidnplayr | 165 | |
166 | .exit: |
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1519 | hidnplayr | 167 | |
1529 | hidnplayr | 168 | } |
1159 | hidnplayr | 169 | |
170 | |||
1519 | hidnplayr | 171 | ;----------------------------------------------------------------- |
1159 | hidnplayr | 172 | ; |
173 | ; |
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1519 | hidnplayr | 174 | ;----------------------------------------------------------------- |
1529 | hidnplayr | 175 | macro TCP_timer_640ms { |
1159 | hidnplayr | 176 | |
1529 | hidnplayr | 177 | local .loop |
178 | local .exit |
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179 | |||
1519 | hidnplayr | 180 | ; Update TCP sequence number |
181 | |||
1514 | hidnplayr | 182 | add [TCP_sequence_num], 64000 |
1159 | hidnplayr | 183 | |
1519 | hidnplayr | 184 | ; scan through all the active TCP sockets, decrementing ALL timers |
185 | ; timers do not have the chance to wrap because of the keepalive timer will kill the socket when it expires |
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1159 | hidnplayr | 186 | |
1519 | hidnplayr | 187 | mov eax, net_sockets |
188 | .loop: |
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189 | mov eax, [eax + SOCKET.NextPtr] |
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190 | .check_only: |
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191 | or eax, eax |
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192 | jz .exit |
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1159 | hidnplayr | 193 | |
1519 | hidnplayr | 194 | cmp [eax + SOCKET.Type], IP_PROTO_TCP |
195 | jne .loop |
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1159 | hidnplayr | 196 | |
1529 | hidnplayr | 197 | inc [eax + TCP_SOCKET.t_idle] |
198 | dec [eax + TCP_SOCKET.timer_retransmission] |
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1519 | hidnplayr | 199 | jnz .check_more2 |
1254 | hidnplayr | 200 | |
1519 | hidnplayr | 201 | DEBUGF 1,"socket %x: Retransmission timer expired\n", eax |
1159 | hidnplayr | 202 | |
1519 | hidnplayr | 203 | push eax |
204 | call TCP_output |
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205 | pop eax |
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1159 | hidnplayr | 206 | |
1519 | hidnplayr | 207 | .check_more2: |
208 | dec [eax + TCP_SOCKET.timer_keepalive] |
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209 | jnz .check_more3 |
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1159 | hidnplayr | 210 | |
1519 | hidnplayr | 211 | DEBUGF 1,"socket %x: Keepalive expired\n", eax |
1159 | hidnplayr | 212 | |
1519 | hidnplayr | 213 | ;;; TODO: check socket state and handle accordingly |
1318 | hidnplayr | 214 | |
1519 | hidnplayr | 215 | .check_more3: |
216 | dec [eax + TCP_SOCKET.timer_timed_wait] |
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217 | jnz .check_more5 |
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218 | |||
219 | DEBUGF 1,"socket %x: 2MSL timer expired\n", eax |
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220 | |||
221 | .check_more5: |
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222 | dec [eax + TCP_SOCKET.timer_persist] |
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223 | jnz .loop |
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224 | |||
225 | DEBUGF 1,"socket %x: persist timer expired\n", eax |
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226 | |||
227 | jmp .loop |
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228 | .exit: |
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1529 | hidnplayr | 229 | } |
1519 | hidnplayr | 230 | |
231 | |||
1529 | hidnplayr | 232 | |
233 | |||
234 | macro TCP_checksum IP1, IP2 { |
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235 | |||
236 | ;------------- |
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237 | ; Pseudoheader |
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238 | |||
239 | ; protocol type |
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240 | mov edx, IP_PROTO_TCP |
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241 | |||
242 | ; source address |
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1530 | hidnplayr | 243 | add dl, byte [IP1+1] |
244 | adc dh, byte [IP1+0] |
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245 | adc dl, byte [IP1+3] |
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246 | adc dh, byte [IP1+2] |
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1529 | hidnplayr | 247 | |
248 | ; destination address |
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1530 | hidnplayr | 249 | adc dl, byte [IP2+1] |
250 | adc dh, byte [IP2+0] |
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251 | adc dl, byte [IP2+3] |
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252 | adc dh, byte [IP2+2] |
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1529 | hidnplayr | 253 | |
254 | ; size |
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255 | adc dl, cl |
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256 | adc dh, ch |
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257 | |||
258 | ;--------------------- |
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259 | ; Real header and data |
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260 | |||
261 | push esi |
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262 | call checksum_1 |
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263 | call checksum_2 |
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264 | pop esi |
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265 | |||
266 | } ; returns in dx only |
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267 | |||
268 | |||
1533 | hidnplayr | 269 | macro TCP_sendseqinit ptr { |
1529 | hidnplayr | 270 | |
1533 | hidnplayr | 271 | push edi ;;;; i dont like this static use of edi |
272 | mov edi, [ptr + TCP_SOCKET.ISS] |
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273 | mov [ptr + TCP_SOCKET.SND_UP], edi |
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274 | mov [ptr + TCP_SOCKET.SND_MAX], edi |
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275 | mov [ptr + TCP_SOCKET.SND_NXT], edi |
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276 | mov [ptr + TCP_SOCKET.SND_UNA], edi |
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277 | pop edi |
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278 | |||
279 | } |
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280 | |||
281 | macro TCP_rcvseqinit ptr { |
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282 | |||
283 | push edi |
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284 | mov edi, [ptr + TCP_SOCKET.IRS] |
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285 | inc edi |
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286 | mov [ptr + TCP_SOCKET.RCV_NXT], edi |
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287 | mov [ptr + TCP_SOCKET.RCV_ADV], edi |
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288 | pop edi |
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289 | |||
290 | } |
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291 | |||
292 | |||
293 | |||
1249 | hidnplayr | 294 | ;----------------------------------------------------------------- |
295 | ; |
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1514 | hidnplayr | 296 | ; TCP_input: |
1159 | hidnplayr | 297 | ; |
1514 | hidnplayr | 298 | ; IN: [esp] = ptr to buffer |
299 | ; [esp+4] = buffer size |
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300 | ; ebx = ptr to device struct |
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301 | ; ecx = segment size |
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302 | ; edx = ptr to TCP segment |
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1196 | hidnplayr | 303 | ; |
1514 | hidnplayr | 304 | ; esi = ipv4 source address |
305 | ; edi = ipv4 dest address |
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306 | ; |
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1196 | hidnplayr | 307 | ; OUT: / |
308 | ; |
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309 | ;----------------------------------------------------------------- |
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1249 | hidnplayr | 310 | align 4 |
1514 | hidnplayr | 311 | TCP_input: |
1159 | hidnplayr | 312 | |
1529 | hidnplayr | 313 | DEBUGF 1,"TCP_input size=%u\n", ecx |
1514 | hidnplayr | 314 | ; Offset must be greater than or equal to the size of the standard TCP header (20) and less than or equal to the TCP length. |
1254 | hidnplayr | 315 | |
1514 | hidnplayr | 316 | movzx eax, [edx + TCP_segment.DataOffset] |
317 | and eax, 0xf0 |
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1529 | hidnplayr | 318 | shr al, 2 |
1514 | hidnplayr | 319 | |
1529 | hidnplayr | 320 | DEBUGF 1,"headersize=%u\n", eax |
1514 | hidnplayr | 321 | |
322 | cmp eax, 20 |
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323 | jl .drop |
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324 | |||
325 | ;------------------------------- |
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326 | ; Now, re-calculate the checksum |
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327 | |||
1529 | hidnplayr | 328 | push eax ecx edx |
329 | pushw [edx + TCP_segment.Checksum] |
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330 | mov [edx + TCP_segment.Checksum], 0 |
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331 | push esi edi |
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1514 | hidnplayr | 332 | mov esi, edx |
1530 | hidnplayr | 333 | TCP_checksum (esp), (esp+4) |
1529 | hidnplayr | 334 | pop esi edi ; yes, swap them (we dont need dest addr) |
335 | pop cx ; previous checksum |
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336 | cmp cx, dx |
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337 | pop edx ecx esi |
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1514 | hidnplayr | 338 | jnz .drop |
339 | |||
340 | DEBUGF 1,"Checksum is correct\n" |
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341 | |||
1529 | hidnplayr | 342 | sub ecx, esi ; update packet size |
343 | jl .drop |
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1534 | hidnplayr | 344 | DEBUGF 1,"we got %u bytes of data\n", ecx |
1529 | hidnplayr | 345 | |
1514 | hidnplayr | 346 | ;----------------------------------------------------------------------------------------- |
347 | ; Check if this packet has a timestamp option (We do it here so we can process it quickly) |
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348 | |||
1529 | hidnplayr | 349 | cmp esi, 20 + 12 ; Timestamp option is 12 bytes |
1514 | hidnplayr | 350 | jl .no_timestamp |
351 | je .is_ok |
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352 | |||
1529 | hidnplayr | 353 | cmp byte [edx + TCP_segment.Data + 12], TCP_OPT_EOL ; end of option list |
1514 | hidnplayr | 354 | jne .no_timestamp |
355 | |||
356 | .is_ok: |
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357 | test [edx + TCP_segment.Flags], TH_SYN ; SYN flag must not be set |
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358 | jnz .no_timestamp |
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359 | |||
360 | cmp dword [edx + TCP_segment.Data], 0x0101080a ; Timestamp header |
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361 | jne .no_timestamp |
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362 | |||
363 | DEBUGF 1,"timestamp ok\n" |
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364 | |||
1529 | hidnplayr | 365 | ; TODO: Parse the option |
1514 | hidnplayr | 366 | ; TODO: Set a Bit in the TCP to tell all options are parsed |
367 | |||
368 | .no_timestamp: |
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369 | |||
370 | ;------------------------------------------- |
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371 | ; Convert Big-endian values to little endian |
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372 | |||
373 | ntohld [edx + TCP_segment.SequenceNumber] |
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374 | ntohld [edx + TCP_segment.AckNumber] |
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375 | |||
376 | ntohlw [edx + TCP_segment.Window] |
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377 | ntohlw [edx + TCP_segment.UrgentPointer] |
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1529 | hidnplayr | 378 | ntohlw [edx + TCP_segment.SourcePort] |
379 | ntohlw [edx + TCP_segment.DestinationPort] |
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1514 | hidnplayr | 380 | |
381 | ;------------------------------------------------------------ |
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382 | ; Next thing to do is find the TCB (thus, the socket pointer) |
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383 | |||
1274 | hidnplayr | 384 | ; IP Packet TCP Destination Port = local Port |
1514 | hidnplayr | 385 | ; (IP Packet SenderAddress = Remote IP) OR (Remote IP = 0) |
1318 | hidnplayr | 386 | ; (IP Packet TCP Source Port = remote Port) OR (remote Port = 0) |
1159 | hidnplayr | 387 | |
388 | mov ebx, net_sockets |
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389 | |||
1249 | hidnplayr | 390 | .socket_loop: |
1514 | hidnplayr | 391 | mov ebx, [ebx + SOCKET.NextPtr] |
1159 | hidnplayr | 392 | or ebx, ebx |
1514 | hidnplayr | 393 | jz .drop_with_reset |
1159 | hidnplayr | 394 | |
1514 | hidnplayr | 395 | cmp [ebx + SOCKET.Type], IP_PROTO_TCP |
1249 | hidnplayr | 396 | jne .socket_loop |
1159 | hidnplayr | 397 | |
1514 | hidnplayr | 398 | mov ax, [edx + TCP_segment.DestinationPort] |
399 | cmp [ebx + TCP_SOCKET.LocalPort], ax |
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400 | jne .socket_loop |
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401 | |||
402 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
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1529 | hidnplayr | 403 | cmp eax, edi ; sender IP |
1249 | hidnplayr | 404 | je @f |
405 | test eax, eax |
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1514 | hidnplayr | 406 | jnz .socket_loop |
1249 | hidnplayr | 407 | @@: |
1159 | hidnplayr | 408 | |
1514 | hidnplayr | 409 | mov ax, [ebx + TCP_SOCKET.RemotePort] |
410 | cmp [edx + TCP_segment.SourcePort] , ax |
||
1274 | hidnplayr | 411 | je .found_socket |
1249 | hidnplayr | 412 | test ax, ax |
1254 | hidnplayr | 413 | jnz .socket_loop |
1274 | hidnplayr | 414 | .found_socket: |
1529 | hidnplayr | 415 | DEBUGF 1,"Socket ptr: %x\n", ebx |
1254 | hidnplayr | 416 | |
1514 | hidnplayr | 417 | ; ebx now contains the pointer to the socket |
1257 | hidnplayr | 418 | |
1514 | hidnplayr | 419 | ;---------------------------- |
420 | ; Check if socket isnt closed |
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421 | |||
1529 | hidnplayr | 422 | cmp [ebx + TCP_SOCKET.t_state], TCB_CLOSED |
1514 | hidnplayr | 423 | je .drop |
424 | |||
425 | ;---------------- |
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426 | ; Lock the socket |
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427 | |||
1529 | hidnplayr | 428 | ;; add ebx, SOCKET.lock ; TODO: figure out if we should lock now already |
429 | ;; call wait_mutex |
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430 | ;; sub ebx, SOCKET.lock |
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1159 | hidnplayr | 431 | |
1529 | hidnplayr | 432 | DEBUGF 1,"Socket locked\n" |
1159 | hidnplayr | 433 | |
1529 | hidnplayr | 434 | ;---------------------------------------------------------------------------------------- |
435 | ; unscale the window into a 32 bit value (notice that SND_SCALE must be initialised to 0) |
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436 | |||
1514 | hidnplayr | 437 | movzx eax, [edx + TCP_segment.Window] |
1534 | hidnplayr | 438 | push ecx |
1529 | hidnplayr | 439 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
1514 | hidnplayr | 440 | shl eax, cl |
1534 | hidnplayr | 441 | pop ecx |
1514 | hidnplayr | 442 | |
1529 | hidnplayr | 443 | ;;;; do something with eax |
1514 | hidnplayr | 444 | |
445 | ;----------------------------------- |
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446 | ; Is this socket a listening socket? |
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447 | |||
1533 | hidnplayr | 448 | test [ebx + SOCKET.options], SO_ACCEPTCON |
1529 | hidnplayr | 449 | ; jnz .listening_socket ;;;;; TODO |
1514 | hidnplayr | 450 | |
1529 | hidnplayr | 451 | ;------------------------------------- |
452 | ; Reset idle timer and keepalive timer |
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1514 | hidnplayr | 453 | |
1529 | hidnplayr | 454 | mov [ebx + TCP_SOCKET.t_idle], 0 |
455 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval |
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1514 | hidnplayr | 456 | |
1529 | hidnplayr | 457 | ;-------------------- |
458 | ; Process TCP options |
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1514 | hidnplayr | 459 | |
1529 | hidnplayr | 460 | cmp esi, 20 ; esi is headersize |
461 | je .no_options |
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1514 | hidnplayr | 462 | |
1529 | hidnplayr | 463 | DEBUGF 1,"Segment has options\n" |
1514 | hidnplayr | 464 | |
1530 | hidnplayr | 465 | cmp [ebx + TCP_SOCKET.t_state], TCB_LISTEN ; no options when in listen state |
1529 | hidnplayr | 466 | jz .no_options |
1514 | hidnplayr | 467 | |
1529 | hidnplayr | 468 | lea edi, [edx + TCP_segment.Data] |
469 | lea eax, [edx + esi] |
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1514 | hidnplayr | 470 | |
1529 | hidnplayr | 471 | .opt_loop: |
472 | cmp edi, eax |
||
473 | jge .no_options |
||
1514 | hidnplayr | 474 | |
1529 | hidnplayr | 475 | cmp byte [edi], TCP_OPT_EOL ; end of option list? |
476 | jz .no_options |
||
1514 | hidnplayr | 477 | |
1529 | hidnplayr | 478 | cmp byte [edi], TCP_OPT_NOP ; nop ? |
479 | jz .opt_nop |
||
1514 | hidnplayr | 480 | |
1529 | hidnplayr | 481 | cmp byte [edi], TCP_OPT_MAXSEG |
482 | je .opt_maxseg |
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1514 | hidnplayr | 483 | |
1529 | hidnplayr | 484 | cmp byte [edi], TCP_OPT_WINDOW |
485 | je .opt_window |
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1514 | hidnplayr | 486 | |
1529 | hidnplayr | 487 | cmp byte [edi], TCP_OPT_TIMESTAMP |
488 | je .opt_timestamp |
||
1514 | hidnplayr | 489 | |
1529 | hidnplayr | 490 | jmp .no_options ; If we reach here, some unknown options were received, skip them all! |
1514 | hidnplayr | 491 | |
1529 | hidnplayr | 492 | .opt_nop: |
493 | inc edi |
||
494 | jmp .opt_loop |
||
1514 | hidnplayr | 495 | |
1529 | hidnplayr | 496 | .opt_maxseg: |
497 | cmp byte [edi+1], 4 |
||
498 | jne .no_options ; error occured, ignore all options! |
||
1514 | hidnplayr | 499 | |
1529 | hidnplayr | 500 | test [edx + TCP_segment.Flags], TH_SYN |
501 | jz @f |
||
502 | |||
1530 | hidnplayr | 503 | movzx eax, word[edi+2] |
504 | rol ax, 8 |
||
1533 | hidnplayr | 505 | DEBUGF 1,"Maxseg: %u\n", ax |
1529 | hidnplayr | 506 | |
1530 | hidnplayr | 507 | mov [ebx + TCP_SOCKET.t_maxseg], eax |
508 | |||
1529 | hidnplayr | 509 | @@: |
510 | add edi, 4 |
||
511 | jmp .opt_loop |
||
512 | |||
513 | |||
514 | .opt_window: |
||
515 | cmp byte [edi+1], 3 |
||
516 | jne .no_options |
||
517 | |||
518 | test [edx + TCP_segment.Flags], TH_SYN |
||
519 | jz @f |
||
520 | |||
1533 | hidnplayr | 521 | DEBUGF 1,"Got window option\n" |
1529 | hidnplayr | 522 | |
523 | ;;;;; |
||
524 | @@: |
||
525 | add edi, 3 |
||
526 | jmp .opt_loop |
||
527 | |||
528 | |||
529 | .opt_timestamp: |
||
530 | cmp byte [edi+1], 10 |
||
531 | jne .no_options |
||
532 | |||
1533 | hidnplayr | 533 | DEBUGF 1,"Got timestamp option\n" |
1529 | hidnplayr | 534 | |
535 | ;;;;; |
||
536 | |||
537 | add edi, 10 |
||
538 | jmp .opt_loop |
||
539 | |||
540 | .no_options: |
||
541 | |||
1514 | hidnplayr | 542 | ;----------------------------------------------------------------------- |
543 | ; Time to do some header prediction (Original Principle by Van Jacobson) |
||
544 | |||
545 | ; There are two common cases for an uni-directional data transfer. |
||
546 | ; |
||
547 | ; General rule: the packets has no control flags, is in-sequence, |
||
548 | ; window width didnt change and we're not retransmitting. |
||
549 | ; |
||
550 | ; Second rules: |
||
551 | ; - If the length is 0 and the ACK moved forward, we're the sender side of the transfer. |
||
552 | ; In this case we'll free the ACK'ed data and notify higher levels that we have free space in buffer |
||
553 | ; |
||
554 | ; - If the length is not 0 and the ACK didn't move, we're the receiver side of the transfer. |
||
555 | ; If the packets are in order (data queue is empty), add the data to the socket buffer and request a delayed ACK |
||
556 | |||
1529 | hidnplayr | 557 | cmp [ebx + TCP_SOCKET.t_state], TCB_ESTABLISHED |
1514 | hidnplayr | 558 | jnz .not_uni_xfer |
559 | |||
1533 | hidnplayr | 560 | DEBUGF 1,"1\n" |
561 | |||
1529 | hidnplayr | 562 | test [edx + TCP_segment.Flags], TH_SYN + TH_FIN + TH_RST + TH_URG |
1514 | hidnplayr | 563 | jnz .not_uni_xfer |
564 | |||
1533 | hidnplayr | 565 | DEBUGF 1,"2\n" |
566 | |||
1529 | hidnplayr | 567 | test [edx + TCP_segment.Flags], TH_ACK |
1514 | hidnplayr | 568 | jz .not_uni_xfer |
569 | |||
1533 | hidnplayr | 570 | DEBUGF 1,"3\n" |
571 | |||
1514 | hidnplayr | 572 | mov eax, [edx + TCP_segment.SequenceNumber] |
573 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
574 | jne .not_uni_xfer |
||
575 | |||
1533 | hidnplayr | 576 | DEBUGF 1,"4\n" |
1514 | hidnplayr | 577 | |
1533 | hidnplayr | 578 | ;; movzx eax, [edx + TCP_segment.Window] ;;;;; (should use pre-calculated value isntead: todo: figure out where to store it) |
579 | ;; cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
580 | ;; jne .not_uni_xfer |
||
581 | |||
582 | DEBUGF 1,"5\n" |
||
583 | |||
1514 | hidnplayr | 584 | mov eax, [ebx + TCP_SOCKET.SND_NXT] |
585 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
586 | jne .not_uni_xfer |
||
587 | |||
1534 | hidnplayr | 588 | DEBUGF 1,"6\n" |
589 | |||
1514 | hidnplayr | 590 | ;--------------------------------------- |
591 | ; check if we are sender in the uni-xfer |
||
592 | |||
593 | ; If the following 4 conditions are all true, this segment is a pure ACK. |
||
594 | ; |
||
1529 | hidnplayr | 595 | ; - The segment contains no data. |
596 | test ecx, ecx |
||
1514 | hidnplayr | 597 | jnz .not_sender |
1274 | hidnplayr | 598 | |
1534 | hidnplayr | 599 | DEBUGF 1,"7\n" |
600 | |||
1529 | hidnplayr | 601 | ; - The congestion window is greater than or equal to the current send window. |
1514 | hidnplayr | 602 | ; This test is true only if the window is fully open, that is, the connection is not in the middle of slow start or congestion avoidance. |
603 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
||
604 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
605 | jl .not_uni_xfer |
||
1318 | hidnplayr | 606 | |
1534 | hidnplayr | 607 | DEBUGF 1,"8\n" |
608 | |||
1529 | hidnplayr | 609 | ; - The acknowledgment field in the segment is less than or equal to the maximum sequence number sent. |
1534 | hidnplayr | 610 | mov eax, [edx + TCP_segment.AckNumber] |
611 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
1529 | hidnplayr | 612 | jg .not_uni_xfer |
613 | |||
1534 | hidnplayr | 614 | DEBUGF 1,"9\n" |
615 | |||
1529 | hidnplayr | 616 | ; - The acknowledgment field in the segment is greater than the largest unacknowledged sequence number. |
1534 | hidnplayr | 617 | sub eax, [ebx + TCP_SOCKET.SND_UNA] |
1529 | hidnplayr | 618 | jle .not_uni_xfer |
619 | |||
1514 | hidnplayr | 620 | DEBUGF 1,"Header prediction: we are sender\n" |
1274 | hidnplayr | 621 | |
1514 | hidnplayr | 622 | ;--------------------------------- |
623 | ; Packet is a pure ACK, process it |
||
1274 | hidnplayr | 624 | |
1514 | hidnplayr | 625 | ; Update RTT estimators |
1159 | hidnplayr | 626 | |
1514 | hidnplayr | 627 | ; Delete acknowledged bytes from send buffer |
1529 | hidnplayr | 628 | ; notice how ecx already holds number of bytes ack-ed |
1254 | hidnplayr | 629 | |
1533 | hidnplayr | 630 | lea eax, [ebx + STREAM_SOCKET.snd] |
1529 | hidnplayr | 631 | call SOCKET_ring_free |
632 | |||
1514 | hidnplayr | 633 | ; Stop retransmit timer |
1519 | hidnplayr | 634 | mov [ebx + TCP_SOCKET.timer_ack], 0 |
1159 | hidnplayr | 635 | |
1514 | hidnplayr | 636 | ; Awaken waiting processes |
1519 | hidnplayr | 637 | mov eax, ebx |
638 | call SOCKET_notify_owner |
||
1318 | hidnplayr | 639 | |
1514 | hidnplayr | 640 | ; Generate more output |
1519 | hidnplayr | 641 | call TCP_output |
1254 | hidnplayr | 642 | |
1514 | hidnplayr | 643 | jmp .drop |
1159 | hidnplayr | 644 | |
1514 | hidnplayr | 645 | ;------------------------------------------------- |
646 | ; maybe we are the receiver in the uni-xfer then.. |
||
647 | |||
648 | .not_sender: |
||
1529 | hidnplayr | 649 | ; - The amount of data in the segment is greater than 0 (data count is in ecx) |
1514 | hidnplayr | 650 | |
1534 | hidnplayr | 651 | DEBUGF 1,"10\n" |
652 | |||
1529 | hidnplayr | 653 | ; - The acknowledgment field equals the largest unacknowledged sequence number. This means no data is acknowledged by this segment. |
1514 | hidnplayr | 654 | mov eax, [edx + TCP_segment.AckNumber] |
655 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
656 | jne .not_uni_xfer |
||
657 | |||
1529 | hidnplayr | 658 | ; - The reassembly list of out-of-order segments for the connection is empty (seg_next equals tp). ;;;;;;; |
1514 | hidnplayr | 659 | |
660 | jnz .not_uni_xfer |
||
661 | |||
662 | ;------------------------------------- |
||
663 | ; Complete processing of received data |
||
664 | |||
665 | DEBUGF 1,"header prediction: we are receiver\nreceiving %u bytes of data\n", ecx |
||
666 | |||
1529 | hidnplayr | 667 | add esi, edx |
1533 | hidnplayr | 668 | lea eax, [ebx + STREAM_SOCKET.rcv] |
669 | call SOCKET_ring_write ; Add the data to the socket buffer |
||
1514 | hidnplayr | 670 | |
1533 | hidnplayr | 671 | mov eax, ebx |
672 | call SOCKET_notify_owner |
||
673 | |||
1529 | hidnplayr | 674 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
675 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK ; Set delayed ack flag |
||
1514 | hidnplayr | 676 | |
677 | jmp .drop |
||
678 | |||
679 | ;---------------------------------------------------- |
||
1529 | hidnplayr | 680 | ; Header prediction failed, doing it the slow way.. ;;;;; current implementation of header prediction destroys some regs (ecx) !! |
1514 | hidnplayr | 681 | |
682 | .not_uni_xfer: |
||
683 | |||
1533 | hidnplayr | 684 | DEBUGF 1,"Header prediction failed\n" ; time to do it the "slow" way :) |
1514 | hidnplayr | 685 | |
686 | ;------------------------------ |
||
687 | ; Calculate receive window size |
||
688 | |||
689 | ;;;; |
||
690 | |||
1529 | hidnplayr | 691 | cmp [ebx + TCP_SOCKET.t_state], TCB_LISTEN |
1514 | hidnplayr | 692 | je .LISTEN |
693 | |||
1529 | hidnplayr | 694 | cmp [ebx + TCP_SOCKET.t_state], TCB_SYN_SENT |
1514 | hidnplayr | 695 | je .SYN_SENT |
696 | |||
697 | ;-------------------------------------------- |
||
698 | ; Protection Against Wrapped Sequence Numbers |
||
699 | |||
1533 | hidnplayr | 700 | ; First, check if timestamp is present |
1514 | hidnplayr | 701 | |
702 | ;;;; TODO |
||
703 | |||
704 | ; Then, check if at least some bytes of data are within window |
||
705 | |||
706 | ;;;; TODO |
||
707 | |||
708 | jmp .trim_then_step6 |
||
709 | |||
1529 | hidnplayr | 710 | ;------------- |
711 | ; Passive Open |
||
712 | |||
1249 | hidnplayr | 713 | align 4 |
1514 | hidnplayr | 714 | .LISTEN: |
1196 | hidnplayr | 715 | |
1514 | hidnplayr | 716 | DEBUGF 1,"TCP state: listen\n" |
1159 | hidnplayr | 717 | |
1514 | hidnplayr | 718 | test [edx + TCP_segment.Flags], TH_RST |
719 | jnz .drop |
||
1159 | hidnplayr | 720 | |
1514 | hidnplayr | 721 | test [edx + TCP_segment.Flags], TH_ACK |
722 | jnz .drop_with_reset |
||
1159 | hidnplayr | 723 | |
1514 | hidnplayr | 724 | test [edx + TCP_segment.Flags], TH_SYN |
725 | jz .drop |
||
1159 | hidnplayr | 726 | |
1533 | hidnplayr | 727 | cmp esi, 0xffffff ; destination ip = 255.255.255.255 ? |
728 | jz .drop |
||
729 | |||
1514 | hidnplayr | 730 | ; TODO: check if it's a broadcast or multicast, and drop if so |
1159 | hidnplayr | 731 | |
1529 | hidnplayr | 732 | call SOCKET_fork |
733 | jz .drop ; if we could not open a new connection, drop segment (;;;; should we send RST too?) |
||
1514 | hidnplayr | 734 | |
1529 | hidnplayr | 735 | ;----------------------- |
736 | ; Fill in some variables |
||
1514 | hidnplayr | 737 | |
1529 | hidnplayr | 738 | add [TCP_sequence_num], 64000 |
1514 | hidnplayr | 739 | |
1529 | hidnplayr | 740 | push [edx + TCP_segment.SourcePort] |
741 | pop [eax + TCP_SOCKET.RemotePort] |
||
1514 | hidnplayr | 742 | |
1529 | hidnplayr | 743 | push [edx + TCP_segment.SequenceNumber] |
744 | pop [eax + TCP_SOCKET.IRS] |
||
1159 | hidnplayr | 745 | |
1529 | hidnplayr | 746 | push [eax + TCP_SOCKET.ISS] |
747 | pop [eax + TCP_SOCKET.SND_NXT] |
||
1159 | hidnplayr | 748 | |
1529 | hidnplayr | 749 | mov [eax + TCP_SOCKET.t_state], TCB_SYN_RECEIVED |
750 | mov [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
||
751 | mov [eax + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval |
||
1159 | hidnplayr | 752 | |
1529 | hidnplayr | 753 | mov ebx, eax |
1514 | hidnplayr | 754 | jmp .trim_then_step6 |
1159 | hidnplayr | 755 | |
1254 | hidnplayr | 756 | |
1529 | hidnplayr | 757 | ;------------ |
758 | ; Active Open |
||
1159 | hidnplayr | 759 | |
1514 | hidnplayr | 760 | align 4 |
761 | .SYN_SENT: |
||
1281 | hidnplayr | 762 | |
1514 | hidnplayr | 763 | DEBUGF 1,"TCP state: syn_sent\n" |
1159 | hidnplayr | 764 | |
1514 | hidnplayr | 765 | test [edx + TCP_segment.Flags], TH_ACK |
766 | jz @f |
||
1281 | hidnplayr | 767 | |
1514 | hidnplayr | 768 | mov eax, [edx + TCP_segment.AckNumber] |
769 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
770 | jle .drop_with_reset |
||
1281 | hidnplayr | 771 | |
1529 | hidnplayr | 772 | ; mov eax, [edx + TCP_segment.AckNumber] |
1533 | hidnplayr | 773 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
774 | jg .drop_with_reset |
||
1514 | hidnplayr | 775 | @@: |
1281 | hidnplayr | 776 | |
1514 | hidnplayr | 777 | test [edx + TCP_segment.Flags], TH_RST |
778 | jz @f |
||
1281 | hidnplayr | 779 | |
1514 | hidnplayr | 780 | test [edx + TCP_segment.Flags], TH_ACK |
781 | jz .drop |
||
1281 | hidnplayr | 782 | |
1514 | hidnplayr | 783 | ;tp = tcp_drop(tp, ECONNREFUSED) |
1159 | hidnplayr | 784 | |
1514 | hidnplayr | 785 | jmp .drop |
786 | @@: |
||
1159 | hidnplayr | 787 | |
1514 | hidnplayr | 788 | test [edx + TCP_segment.Flags], TH_SYN |
789 | jz .drop |
||
1318 | hidnplayr | 790 | |
1529 | hidnplayr | 791 | ; at this point, segment seems to be valid |
792 | |||
1514 | hidnplayr | 793 | test [edx + TCP_segment.Flags], TH_ACK |
1529 | hidnplayr | 794 | jz .no_syn_ack |
1514 | hidnplayr | 795 | |
1529 | hidnplayr | 796 | ; now, process received SYN in response to an active open |
797 | |||
1514 | hidnplayr | 798 | mov eax, [edx + TCP_segment.AckNumber] |
799 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
800 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
801 | jle @f |
||
802 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1529 | hidnplayr | 803 | @@: |
1514 | hidnplayr | 804 | |
1529 | hidnplayr | 805 | .no_syn_ack: |
1514 | hidnplayr | 806 | |
1529 | hidnplayr | 807 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 ; disable retransmission |
1514 | hidnplayr | 808 | |
1529 | hidnplayr | 809 | push [edx + TCP_segment.SequenceNumber] |
810 | pop [ebx + TCP_SOCKET.IRS] |
||
811 | |||
1533 | hidnplayr | 812 | TCP_rcvseqinit ebx |
1529 | hidnplayr | 813 | |
814 | mov [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
815 | |||
816 | mov eax, [ebx + TCP_SOCKET.SND_UNA] |
||
817 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
818 | jle .simultaneous_open |
||
819 | |||
820 | test [edx + TCP_segment.Flags], TH_ACK |
||
821 | jz .simultaneous_open |
||
822 | |||
823 | DEBUGF 1,"TCP: active open\n" |
||
824 | |||
825 | ; TODO: update stats |
||
1533 | hidnplayr | 826 | ; TODO: set general socket state to connected |
1514 | hidnplayr | 827 | |
828 | mov [ebx + TCP_SOCKET.t_state], TCB_ESTABLISHED |
||
829 | |||
830 | ; TODO: check if we should scale the connection (567-572) |
||
831 | ; TODO: update RTT estimators |
||
832 | |||
1529 | hidnplayr | 833 | jmp .trimthenstep6 |
1514 | hidnplayr | 834 | |
1529 | hidnplayr | 835 | .simultaneous_open: |
1514 | hidnplayr | 836 | |
1529 | hidnplayr | 837 | DEBUGF 1,"TCP: simultaneous open\n" |
1514 | hidnplayr | 838 | ; We have received a syn but no ACK, so we are having a simultaneous open.. |
839 | mov [ebx + TCP_SOCKET.t_state], TCB_SYN_RECEIVED |
||
840 | |||
841 | ;------------------------------------- |
||
842 | ; Common processing for receipt of SYN |
||
843 | |||
844 | .trimthenstep6: |
||
845 | |||
846 | inc [edx + TCP_segment.SequenceNumber] |
||
847 | |||
848 | cmp cx, [ebx + TCP_SOCKET.RCV_WND] |
||
849 | jle @f |
||
850 | |||
851 | movzx eax, cx |
||
852 | sub ax, [ebx + TCP_SOCKET.RCV_WND] |
||
853 | ; TODO: 592 |
||
854 | mov cx, [ebx + TCP_SOCKET.RCV_WND] |
||
855 | ; TODO... |
||
856 | @@: |
||
857 | ;;;;; |
||
1529 | hidnplayr | 858 | jmp .step6 |
1514 | hidnplayr | 859 | |
860 | |||
861 | |||
862 | |||
863 | |||
1529 | hidnplayr | 864 | .trim_then_step6: |
1159 | hidnplayr | 865 | |
1514 | hidnplayr | 866 | ;---------------------------- |
867 | ; trim any data not in window |
||
1159 | hidnplayr | 868 | |
1533 | hidnplayr | 869 | DEBUGF 1,"Trimming window\n" |
870 | |||
1514 | hidnplayr | 871 | mov eax, [ebx + TCP_SOCKET.RCV_NXT] |
872 | sub eax, [edx + TCP_segment.SequenceNumber] |
||
1318 | hidnplayr | 873 | |
1514 | hidnplayr | 874 | test eax, eax |
1533 | hidnplayr | 875 | jz .no_duplicate |
1274 | hidnplayr | 876 | |
1514 | hidnplayr | 877 | test [edx + TCP_segment.Flags], TH_SYN |
878 | jz .no_drop |
||
879 | |||
880 | and [edx + TCP_segment.Flags], not (TH_SYN) |
||
881 | inc [edx + TCP_segment.SequenceNumber] |
||
882 | |||
883 | cmp [edx + TCP_segment.UrgentPointer], 1 |
||
884 | jl @f |
||
885 | |||
886 | dec [edx + TCP_segment.UrgentPointer] |
||
887 | |||
888 | jmp .no_drop |
||
889 | @@: |
||
890 | |||
891 | and [edx + TCP_segment.Flags], not (TH_URG) |
||
892 | dec eax |
||
1533 | hidnplayr | 893 | jz .no_duplicate |
1514 | hidnplayr | 894 | .no_drop: |
895 | |||
1533 | hidnplayr | 896 | DEBUGF 1,"Going to drop %u out of %u bytes\n", eax, ecx |
1529 | hidnplayr | 897 | |
1514 | hidnplayr | 898 | ; eax holds number of bytes to drop |
899 | |||
900 | ;---------------------------------- |
||
901 | ; Check for entire duplicate packet |
||
902 | |||
903 | cmp eax, ecx |
||
904 | jge .duplicate |
||
905 | |||
906 | ;;; TODO: figure 28.30 |
||
907 | |||
908 | ;------------------------ |
||
909 | ; Check for duplicate FIN |
||
910 | |||
911 | test [edx + TCP_segment.Flags], TH_FIN |
||
912 | jz @f |
||
913 | inc ecx |
||
914 | cmp eax, ecx |
||
915 | dec ecx |
||
916 | jne @f |
||
917 | |||
918 | mov eax, ecx |
||
919 | and [edx + TCP_segment.Flags], not TH_FIN |
||
1529 | hidnplayr | 920 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1514 | hidnplayr | 921 | jmp .no_duplicate |
922 | @@: |
||
923 | |||
924 | ; Handle the case when a bound socket connects to itself |
||
925 | ; Allow packets with a SYN and an ACKto continue with the processing |
||
926 | |||
927 | ;------------------------------------- |
||
928 | ; Generate duplicate ACK if nescessary |
||
929 | |||
930 | ; This code also handles simultaneous half-open or self-connects |
||
931 | |||
932 | test eax, eax |
||
933 | jnz .drop_after_ack |
||
934 | |||
935 | cmp [edx + TCP_segment.Flags], TH_ACK |
||
936 | jz .drop_after_ack |
||
937 | |||
938 | .duplicate: |
||
939 | |||
1533 | hidnplayr | 940 | DEBUGF 1,"Duplicate received\n" |
1529 | hidnplayr | 941 | |
1514 | hidnplayr | 942 | ;---------------------------------------- |
943 | ; Update statistics for duplicate packets |
||
944 | |||
945 | ;;; TODO |
||
946 | |||
1529 | hidnplayr | 947 | jmp .drop ;;; DROP the packet ?? |
1514 | hidnplayr | 948 | |
949 | .no_duplicate: |
||
950 | |||
951 | ;----------------------------------------------- |
||
952 | ; Remove duplicate data and update urgent offset |
||
953 | |||
954 | add [edx + TCP_segment.SequenceNumber], eax |
||
955 | |||
956 | ;;; TODO |
||
957 | |||
958 | sub [edx + TCP_segment.UrgentPointer], ax |
||
959 | jg @f |
||
960 | |||
961 | and [edx + TCP_segment.Flags], not (TH_URG) |
||
962 | mov [edx + TCP_segment.UrgentPointer], 0 |
||
963 | @@: |
||
964 | |||
965 | ;-------------------------------------------------- |
||
966 | ; Handle data that arrives after process terminates |
||
967 | |||
968 | cmp [ebx + SOCKET.PID], 0 |
||
1533 | hidnplayr | 969 | jg @f |
1514 | hidnplayr | 970 | |
971 | cmp [ebx + TCP_SOCKET.t_state], TCB_CLOSE_WAIT |
||
972 | jle @f |
||
973 | |||
974 | test ecx, ecx |
||
975 | jz @f |
||
976 | |||
977 | ;;; Close the socket |
||
978 | ;;; update stats |
||
979 | |||
980 | jmp .drop_with_reset |
||
981 | @@: |
||
982 | |||
983 | ;---------------------------------------- |
||
984 | ; Remove data beyond right edge of window |
||
985 | |||
986 | mov eax, [edx + TCP_segment.SequenceNumber] |
||
987 | add eax, ecx |
||
988 | sub eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
989 | sub ax, [ebx + TCP_SOCKET.RCV_WND] |
||
990 | |||
991 | ; eax now holds the number of bytes to drop |
||
992 | |||
993 | jle .no_excess_data |
||
994 | |||
995 | ;;; TODO: update stats |
||
996 | |||
997 | cmp eax, ecx |
||
998 | jl .dont_drop_all |
||
999 | |||
1000 | ;;; TODO 700-736 |
||
1001 | |||
1002 | .dont_drop_all: |
||
1003 | |||
1004 | .no_excess_data: |
||
1005 | |||
1006 | ;----------------- |
||
1007 | ; Record timestamp |
||
1008 | |||
1009 | ;;; TODO 737-746 |
||
1010 | |||
1011 | ;------------------ |
||
1012 | ; Process RST flags |
||
1013 | |||
1014 | test [edx + TCP_segment.Flags], TH_RST |
||
1015 | jz .rst_skip |
||
1016 | |||
1529 | hidnplayr | 1017 | DEBUGF 1,"Got an RST flag" |
1018 | |||
1514 | hidnplayr | 1019 | mov eax, [ebx + TCP_SOCKET.t_state] |
1020 | shl eax, 2 |
||
1021 | jmp dword [eax + .rst_sw_list] |
||
1022 | |||
1023 | .rst_sw_list: |
||
1024 | dd .rst_skip ;TCB_CLOSED |
||
1025 | dd .rst_skip ;TCB_LISTEN |
||
1026 | dd .rst_skip ;TCB_SYN_SENT |
||
1027 | dd .econnrefused ;TCB_SYN_RECEIVED |
||
1028 | dd .econnreset ;TCB_ESTABLISHED |
||
1029 | dd .econnreset ;TCB_CLOSE_WAIT |
||
1030 | dd .econnreset ;TCB_FIN_WAIT_1 |
||
1031 | dd .rst_close ;TCB_CLOSING |
||
1032 | dd .rst_close ;TCB_LAST_ACK |
||
1033 | dd .econnreset ;TCB_FIN_WAIT_2 |
||
1034 | dd .rst_close ;TCB_TIMED_WAIT |
||
1035 | |||
1036 | .econnrefused: |
||
1037 | |||
1529 | hidnplayr | 1038 | DEBUGF 1,"Connection refused" |
1039 | |||
1514 | hidnplayr | 1040 | ;;; TODO: debug info |
1041 | |||
1042 | jmp .close |
||
1043 | |||
1044 | .econnreset: |
||
1045 | |||
1529 | hidnplayr | 1046 | DEBUGF 1,"Connection reset" |
1047 | |||
1514 | hidnplayr | 1048 | ;;; TODO: debug info |
1529 | hidnplayr | 1049 | .close: |
1514 | hidnplayr | 1050 | |
1529 | hidnplayr | 1051 | DEBUGF 1,"Closing connection" |
1052 | |||
1514 | hidnplayr | 1053 | ;;; update stats |
1054 | |||
1055 | .rst_close: |
||
1056 | |||
1534 | hidnplayr | 1057 | DEBUGF 1,"Closing with reset\n" |
1529 | hidnplayr | 1058 | |
1514 | hidnplayr | 1059 | ;;; Close the socket |
1060 | jmp .drop |
||
1061 | |||
1062 | .rst_skip: |
||
1063 | |||
1064 | ;-------------------------------------- |
||
1065 | ; handle SYN-full and ACK-less segments |
||
1066 | |||
1067 | test [edx + TCP_segment.Flags], TH_SYN |
||
1068 | jz @f |
||
1069 | |||
1070 | ;;; tcp_drop ( ECONNRESET) |
||
1071 | jmp .drop_with_reset |
||
1072 | |||
1073 | test [edx + TCP_segment.Flags], TH_ACK |
||
1074 | jz .drop |
||
1534 | hidnplayr | 1075 | @@: |
1514 | hidnplayr | 1076 | ;---------------- |
1077 | ; Process the ACK |
||
1078 | |||
1079 | cmp [ebx + TCP_SOCKET.t_state], TCB_SYN_RECEIVED |
||
1080 | jg .ack_dup |
||
1081 | jl .ack_nodup |
||
1082 | |||
1534 | hidnplayr | 1083 | DEBUGF 1,"TCP state = syn received\n" |
1533 | hidnplayr | 1084 | |
1514 | hidnplayr | 1085 | ;;;;; |
1086 | |||
1087 | .ack_dup: |
||
1088 | |||
1534 | hidnplayr | 1089 | DEBUGF 1,"Duplicate ACK\n" |
1533 | hidnplayr | 1090 | |
1514 | hidnplayr | 1091 | ;;;; |
1092 | |||
1093 | .ack_nodup: |
||
1094 | |||
1095 | ;;;; 887 |
||
1096 | |||
1534 | hidnplayr | 1097 | DEBUGF 1,"New ACK\n" |
1533 | hidnplayr | 1098 | |
1514 | hidnplayr | 1099 | ;------------------------------------------------- |
1519 | hidnplayr | 1100 | ; If the congestion window was inflated to account |
1514 | hidnplayr | 1101 | ; for the other side's cached packets, retrace it |
1102 | |||
1103 | ;;;; 888 - 902 |
||
1104 | |||
1105 | |||
1106 | ;------------------------------------------ |
||
1107 | ; RTT measurements and retransmission timer |
||
1108 | |||
1109 | ;;;;; 903 - 926 |
||
1110 | |||
1519 | hidnplayr | 1111 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 |
1514 | hidnplayr | 1112 | |
1519 | hidnplayr | 1113 | mov eax, [ebx + TCP_SOCKET.SND_MAX] |
1114 | cmp eax, [edx + TCP_segment.AckNumber] |
||
1115 | je .all_outstanding |
||
1116 | mov [ebx + TCP_SOCKET.timer_retransmission], 120 ;;;; TODO: correct this value |
||
1117 | .all_outstanding: |
||
1118 | |||
1514 | hidnplayr | 1119 | ;------------------------------------------- |
1120 | ; Open congestion window in response to ACKs |
||
1121 | |||
1122 | ;;;; |
||
1123 | |||
1124 | |||
1125 | ;------------------------------------------ |
||
1126 | ; Remove acknowledged data from send buffer |
||
1127 | |||
1534 | hidnplayr | 1128 | push ecx |
1129 | mov ecx, [edx + TCP_segment.AckNumber] ;;; |
||
1130 | sub ecx, [ebx + TCP_SOCKET.SND_UNA] ;;; |
||
1533 | hidnplayr | 1131 | lea eax, [ebx + STREAM_SOCKET.snd] |
1132 | call SOCKET_ring_free ;;;; 943 - 956 |
||
1534 | hidnplayr | 1133 | pop ecx |
1514 | hidnplayr | 1134 | |
1135 | ;--------------------------------------- |
||
1136 | ; Wake up process waiting on send buffer |
||
1137 | |||
1529 | hidnplayr | 1138 | mov eax, ebx |
1139 | call SOCKET_notify_owner |
||
1514 | hidnplayr | 1140 | |
1141 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
1142 | shl eax, 2 |
||
1143 | jmp dword [eax + .ACK_sw_list] |
||
1144 | |||
1145 | .ACK_sw_list: |
||
1146 | dd .step6 ;TCB_CLOSED |
||
1147 | dd .step6 ;TCB_LISTEN |
||
1148 | dd .step6 ;TCB_SYN_SENT |
||
1149 | dd .step6 ;TCB_SYN_RECEIVED |
||
1150 | dd .step6 ;TCB_ESTABLISHED |
||
1151 | dd .step6 ;TCB_CLOSE_WAIT |
||
1152 | dd ._963 ;TCB_FIN_WAIT_1 |
||
1153 | dd ._958 ;TCB_CLOSING |
||
1154 | dd ._999 ;TCB_LAST_ACK |
||
1155 | dd .step6 ;TCB_FIN_WAIT_2 |
||
1156 | dd ._1010 ;TCB_TIMED_WAIT |
||
1157 | |||
1158 | |||
1159 | ._963: |
||
1160 | |||
1161 | |||
1162 | jmp .step6 |
||
1163 | |||
1164 | |||
1165 | ._958: |
||
1166 | |||
1167 | jmp .step6 |
||
1168 | |||
1169 | ._999: |
||
1170 | |||
1171 | jmp .step6 |
||
1172 | |||
1173 | |||
1174 | ._1010: |
||
1175 | |||
1176 | jmp .step6 |
||
1177 | |||
1178 | |||
1179 | |||
1180 | align 4 |
||
1181 | .step6: |
||
1182 | |||
1183 | DEBUGF 1,"step 6\n" |
||
1184 | |||
1185 | ;-------------------------- |
||
1186 | ; update window information |
||
1187 | |||
1188 | test [edx + TCP_segment.Flags], TH_ACK |
||
1189 | jz .no_window_update |
||
1190 | |||
1191 | mov eax, [ebx + TCP_SOCKET.SND_WL1] |
||
1192 | cmp eax, [edx + TCP_segment.SequenceNumber] |
||
1193 | |||
1194 | ;;;; 1021 |
||
1195 | |||
1196 | ;---------------------------------- |
||
1197 | ; Keep track of pure window updates |
||
1198 | |||
1199 | test ecx, ecx |
||
1200 | jz @f |
||
1201 | |||
1202 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
||
1203 | cmp eax, [edx + TCP_segment.AckNumber] |
||
1204 | jne @f |
||
1205 | |||
1206 | ;; mov eax, tiwin |
||
1207 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
1208 | jle @f |
||
1209 | |||
1210 | ;;; update stats |
||
1211 | |||
1212 | @@: |
||
1213 | |||
1214 | ;; mov eax, incoming window |
||
1215 | cmp eax, [ebx + TCP_SOCKET.max_sndwnd] |
||
1216 | jle @f |
||
1217 | mov [ebx + TCP_SOCKET.max_sndwnd], eax |
||
1218 | @@: |
||
1219 | mov [ebx + TCP_SOCKET.SND_WND], eax |
||
1220 | |||
1221 | mov eax, [edx + TCP_segment.SequenceNumber] |
||
1222 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
1223 | |||
1224 | mov eax, [edx + TCP_segment.AckNumber] |
||
1225 | mov [ebx + TCP_SOCKET.SND_WL2], eax |
||
1226 | |||
1227 | ;;; needoutput = 1 |
||
1228 | |||
1229 | .no_window_update: |
||
1230 | |||
1231 | ;----------------- |
||
1232 | ; process URG flag |
||
1233 | |||
1234 | test [edx + TCP_segment.Flags], TH_URG |
||
1235 | jz .not_urgent |
||
1236 | |||
1237 | cmp [edx + TCP_segment.UrgentPointer], 0 |
||
1238 | jz .not_urgent |
||
1239 | |||
1240 | cmp [ebx + TCP_SOCKET.t_state], TCB_TIMED_WAIT |
||
1241 | je .not_urgent |
||
1242 | |||
1243 | ; Ignore bogus urgent offsets |
||
1244 | |||
1245 | ;;; 1040-1050 |
||
1246 | |||
1247 | movzx eax, [edx + TCP_segment.UrgentPointer] |
||
1533 | hidnplayr | 1248 | add eax, [ebx + STREAM_SOCKET.rcv + RING_BUFFER.size] |
1514 | hidnplayr | 1249 | cmp eax, SOCKET_MAXDATA |
1250 | jle .not_urgent |
||
1251 | |||
1252 | mov [edx + TCP_segment.UrgentPointer], 0 |
||
1253 | and [edx + TCP_segment.Flags], not (TH_URG) |
||
1254 | jmp .do_data |
||
1255 | |||
1256 | .not_urgent: |
||
1257 | |||
1258 | ;-------------------------------------- |
||
1259 | ; processing of received urgent pointer |
||
1260 | |||
1529 | hidnplayr | 1261 | ;;; TODO (1051-1093) |
1514 | hidnplayr | 1262 | |
1529 | hidnplayr | 1263 | ;-------------------------------- |
1264 | ; process the data in the segment |
||
1514 | hidnplayr | 1265 | |
1529 | hidnplayr | 1266 | .do_data: |
1514 | hidnplayr | 1267 | |
1534 | hidnplayr | 1268 | DEBUGF 1,"TCP: do data (%u)\n", ecx |
1514 | hidnplayr | 1269 | |
1270 | test [edx + TCP_segment.Flags], TH_FIN |
||
1529 | hidnplayr | 1271 | jnz .process_fin |
1514 | hidnplayr | 1272 | |
1533 | hidnplayr | 1273 | cmp [ebx + TCP_SOCKET.t_state], TCB_FIN_WAIT_1 |
1514 | hidnplayr | 1274 | jge .dont_do_data |
1275 | |||
1533 | hidnplayr | 1276 | test ecx, ecx |
1277 | jz .final_processing |
||
1278 | |||
1514 | hidnplayr | 1279 | DEBUGF 1,"Processing data in segment\n" |
1280 | |||
1533 | hidnplayr | 1281 | ;; TODO: check if data is in sequence ! |
1514 | hidnplayr | 1282 | |
1533 | hidnplayr | 1283 | movzx eax, [edx + TCP_segment.DataOffset] ;;; todo: remember this in.. edi ? |
1284 | and eax, 0xf0 |
||
1285 | shr al, 2 |
||
1286 | |||
1287 | lea esi, [edx + eax] |
||
1288 | |||
1289 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK |
||
1290 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ;;; right ? |
||
1291 | |||
1292 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
1293 | call SOCKET_ring_write |
||
1294 | |||
1295 | mov eax, ebx |
||
1296 | call SOCKET_notify_owner |
||
1297 | |||
1514 | hidnplayr | 1298 | jmp .final_processing |
1299 | |||
1300 | |||
1301 | .dont_do_data: |
||
1302 | |||
1303 | ;--------------- |
||
1304 | ; FIN processing |
||
1305 | |||
1306 | .process_fin: |
||
1307 | |||
1308 | DEBUGF 1,"Processing FIN\n" |
||
1309 | |||
1310 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
1311 | shl eax, 2 |
||
1312 | jmp dword [eax + .FIN_sw_list] |
||
1313 | |||
1314 | .FIN_sw_list: |
||
1315 | dd .no_fin ;TCB_CLOSED |
||
1316 | dd .no_fin ;TCB_LISTEN |
||
1317 | dd .no_fin ;TCB_SYN_SENT |
||
1533 | hidnplayr | 1318 | dd .fin_syn_est ;TCB_SYN_RECEIVED |
1319 | dd .fin_syn_est ;TCB_ESTABLISHED |
||
1514 | hidnplayr | 1320 | dd .no_fin ;TCB_CLOSE_WAIT |
1533 | hidnplayr | 1321 | dd .fin_wait1 ;TCB_FIN_WAIT_1 |
1514 | hidnplayr | 1322 | dd .no_fin ;TCB_CLOSING |
1323 | dd .no_fin ;TCB_LAST_ACK |
||
1533 | hidnplayr | 1324 | dd .fin_wait2 ;TCB_FIN_WAIT_2 |
1325 | dd .fin_timed ;TCB_TIMED_WAIT |
||
1514 | hidnplayr | 1326 | |
1327 | |||
1328 | |||
1533 | hidnplayr | 1329 | .fin_syn_est: |
1514 | hidnplayr | 1330 | |
1533 | hidnplayr | 1331 | jmp .final_processing |
1514 | hidnplayr | 1332 | |
1533 | hidnplayr | 1333 | .fin_wait1: |
1514 | hidnplayr | 1334 | |
1533 | hidnplayr | 1335 | jmp .final_processing |
1514 | hidnplayr | 1336 | |
1533 | hidnplayr | 1337 | .fin_wait2: |
1514 | hidnplayr | 1338 | |
1533 | hidnplayr | 1339 | jmp .final_processing |
1340 | |||
1341 | .fin_timed: |
||
1342 | |||
1343 | jmp .final_processing |
||
1344 | |||
1514 | hidnplayr | 1345 | .no_fin: |
1346 | |||
1347 | ;----------------- |
||
1348 | ; Final processing |
||
1349 | |||
1350 | .final_processing: |
||
1351 | |||
1352 | DEBUGF 1,"Final processing\n" |
||
1353 | |||
1533 | hidnplayr | 1354 | mov [ebx + SOCKET.lock], 0 |
1355 | |||
1514 | hidnplayr | 1356 | ;;; if debug enabled, output packet |
1357 | |||
1358 | ;test ;;;needoutput = 1 |
||
1359 | ;jnz .outputnow |
||
1360 | |||
1361 | test [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1529 | hidnplayr | 1362 | jnz .ack_now |
1514 | hidnplayr | 1363 | |
1529 | hidnplayr | 1364 | call kernel_free |
1365 | add esp, 4 |
||
1366 | ret |
||
1367 | |||
1368 | .ack_now: |
||
1369 | |||
1370 | DEBUGF 1,"ACK now!\n" |
||
1371 | |||
1372 | push ebx |
||
1373 | mov eax, ebx |
||
1514 | hidnplayr | 1374 | call TCP_output |
1529 | hidnplayr | 1375 | pop ebx |
1514 | hidnplayr | 1376 | |
1274 | hidnplayr | 1377 | call kernel_free |
1529 | hidnplayr | 1378 | add esp, 4 |
1379 | ret |
||
1274 | hidnplayr | 1380 | |
1514 | hidnplayr | 1381 | ;------------------------------------------ |
1382 | ; Generate an ACK, droping incoming segment |
||
1274 | hidnplayr | 1383 | |
1514 | hidnplayr | 1384 | align 4 |
1385 | .drop_after_ack: |
||
1274 | hidnplayr | 1386 | |
1514 | hidnplayr | 1387 | DEBUGF 1,"Drop after ACK\n" |
1274 | hidnplayr | 1388 | |
1514 | hidnplayr | 1389 | test [edx + TCP_segment.Flags], TH_RST |
1390 | jnz .drop |
||
1274 | hidnplayr | 1391 | |
1514 | hidnplayr | 1392 | and [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1274 | hidnplayr | 1393 | |
1529 | hidnplayr | 1394 | push ebx |
1395 | mov eax, ebx |
||
1514 | hidnplayr | 1396 | call TCP_output |
1529 | hidnplayr | 1397 | pop ebx |
1318 | hidnplayr | 1398 | |
1514 | hidnplayr | 1399 | call kernel_free |
1529 | hidnplayr | 1400 | add esp, 4 |
1401 | ret |
||
1274 | hidnplayr | 1402 | |
1514 | hidnplayr | 1403 | |
1404 | ;------------------------------------------- |
||
1405 | ; Generate an RST, dropping incoming segment |
||
1406 | |||
1407 | align 4 |
||
1408 | .drop_with_reset: |
||
1409 | |||
1410 | DEBUGF 1,"Drop with reset\n" |
||
1411 | |||
1412 | test [edx + TCP_segment.Flags], TH_RST |
||
1413 | jnz .drop |
||
1414 | |||
1415 | ;;; if its a multicast/broadcast, also drop |
||
1416 | |||
1417 | test [edx + TCP_segment.Flags], TH_ACK |
||
1418 | jnz .respond_ack |
||
1419 | |||
1420 | test [edx + TCP_segment.Flags], TH_SYN |
||
1421 | jnz .respond_syn |
||
1422 | |||
1423 | call kernel_free |
||
1529 | hidnplayr | 1424 | add esp, 4 |
1425 | ret |
||
1514 | hidnplayr | 1426 | |
1427 | .respond_ack: |
||
1428 | |||
1533 | hidnplayr | 1429 | mov dl, TH_RST |
1514 | hidnplayr | 1430 | |
1533 | hidnplayr | 1431 | push ebx |
1529 | hidnplayr | 1432 | call TCP_respond_segment |
1533 | hidnplayr | 1433 | pop ebx |
1514 | hidnplayr | 1434 | |
1435 | jmp .destroy_new_socket |
||
1436 | |||
1437 | |||
1438 | .respond_syn: |
||
1439 | |||
1533 | hidnplayr | 1440 | mov dl, TH_RST + TH_ACK |
1514 | hidnplayr | 1441 | |
1533 | hidnplayr | 1442 | push ebx |
1443 | call TCP_respond_socket |
||
1444 | pop ebx |
||
1514 | hidnplayr | 1445 | |
1446 | jmp .destroy_new_socket |
||
1447 | |||
1448 | ;----- |
||
1449 | ; Drop |
||
1450 | |||
1451 | align 4 |
||
1452 | .drop: |
||
1453 | |||
1454 | DEBUGF 1,"Dropping packet\n" |
||
1455 | |||
1456 | ;;;; If debugging options are enabled, output the packet somwhere |
||
1457 | |||
1458 | .destroy_new_socket: |
||
1459 | |||
1460 | ;;;; kill the newly created socket |
||
1461 | |||
1462 | call kernel_free |
||
1529 | hidnplayr | 1463 | add esp, 4 |
1464 | ret |
||
1514 | hidnplayr | 1465 | |
1466 | |||
1467 | |||
1468 | |||
1469 | |||
1470 | |||
1471 | ;--------------------------- |
||
1472 | ; |
||
1473 | ; TCP_pull_out_of_band |
||
1474 | ; |
||
1475 | ; IN: eax = |
||
1476 | ; ebx = socket ptr |
||
1477 | ; edx = tcp packet ptr |
||
1478 | ; |
||
1479 | ; OUT: / |
||
1480 | ; |
||
1481 | ;--------------------------- |
||
1482 | |||
1483 | align 4 |
||
1484 | TCP_pull_out_of_band: |
||
1485 | |||
1486 | DEBUGF 1,"TCP_pull_out_of_band\n" |
||
1487 | |||
1488 | ;;;; 1282-1305 |
||
1489 | |||
1318 | hidnplayr | 1490 | ret |
1491 | |||
1492 | |||
1493 | |||
1494 | ;----------------------------------------------------------------- |
||
1495 | ; |
||
1514 | hidnplayr | 1496 | ; TCP_output |
1318 | hidnplayr | 1497 | ; |
1519 | hidnplayr | 1498 | ; IN: eax = socket pointer |
1514 | hidnplayr | 1499 | ;; esi = ptr to data |
1500 | ;; ecx = number of data bytes |
||
1501 | ; |
||
1318 | hidnplayr | 1502 | ; OUT: / |
1503 | ; |
||
1504 | ;----------------------------------------------------------------- |
||
1505 | align 4 |
||
1514 | hidnplayr | 1506 | TCP_output: |
1318 | hidnplayr | 1507 | |
1514 | hidnplayr | 1508 | DEBUGF 1,"TCP_output, socket: %x\n", eax |
1318 | hidnplayr | 1509 | |
1514 | hidnplayr | 1510 | ; We'll detect the length of the data to be transmitted, and flags to be used |
1511 | ; If there is some data, or any critical controls to send (SYN / RST), then transmit |
||
1512 | ; Otherwise, investigate further |
||
1318 | hidnplayr | 1513 | |
1514 | hidnplayr | 1514 | mov ebx, [eax + TCP_SOCKET.SND_MAX] |
1515 | cmp ebx, [eax + TCP_SOCKET.SND_UNA] |
||
1516 | jne .not_idle |
||
1318 | hidnplayr | 1517 | |
1514 | hidnplayr | 1518 | mov ebx, [eax + TCP_SOCKET.t_idle] |
1519 | cmp ebx, [eax + TCP_SOCKET.t_rxtcur] |
||
1520 | jle .not_idle |
||
1318 | hidnplayr | 1521 | |
1514 | hidnplayr | 1522 | ; We have been idle for a while and no ACKS are expected to clock out any data we send.. |
1523 | ; Slow start to get ack "clock" running again. |
||
1318 | hidnplayr | 1524 | |
1514 | hidnplayr | 1525 | mov ebx, [eax + TCP_SOCKET.t_maxseg] |
1526 | mov [eax + TCP_SOCKET.SND_CWND], ebx |
||
1318 | hidnplayr | 1527 | |
1514 | hidnplayr | 1528 | .not_idle: |
1529 | .again: |
||
1530 | mov ebx, [eax + TCP_SOCKET.SND_NXT] ; calculate offset |
||
1531 | sub ebx, [eax + TCP_SOCKET.SND_UNA] ; |
||
1318 | hidnplayr | 1532 | |
1514 | hidnplayr | 1533 | mov ecx, [eax + TCP_SOCKET.SND_WND] ; determine window |
1534 | cmp ecx, [eax + TCP_SOCKET.SND_CWND] ; |
||
1535 | jl @f ; |
||
1536 | mov ecx, [eax + TCP_SOCKET.SND_CWND] ; |
||
1537 | @@: ; |
||
1318 | hidnplayr | 1538 | |
1529 | hidnplayr | 1539 | call TCP_outflags ; in dl |
1318 | hidnplayr | 1540 | |
1514 | hidnplayr | 1541 | ; If in persist timeout with window of 0, send 1 byte. |
1542 | ; Otherwise, if window is small but nonzero, and timer expired, |
||
1543 | ; we will send what we can and go to transmit state |
||
1318 | hidnplayr | 1544 | |
1514 | hidnplayr | 1545 | test [eax + TCP_SOCKET.t_force], -1 |
1546 | jz .no_persist_timeout |
||
1318 | hidnplayr | 1547 | |
1514 | hidnplayr | 1548 | test ecx, ecx |
1549 | jnz .no_zero_window |
||
1255 | hidnplayr | 1550 | |
1533 | hidnplayr | 1551 | cmp ebx, [eax + STREAM_SOCKET.snd + RING_BUFFER.size] |
1514 | hidnplayr | 1552 | jge @f |
1255 | hidnplayr | 1553 | |
1514 | hidnplayr | 1554 | and dl, not (TH_FIN) ; clear the FIN flag ??? how can it be set before? |
1255 | hidnplayr | 1555 | |
1514 | hidnplayr | 1556 | @@: |
1557 | inc ecx |
||
1558 | jmp .no_persist_timeout |
||
1255 | hidnplayr | 1559 | |
1514 | hidnplayr | 1560 | .no_zero_window: |
1254 | hidnplayr | 1561 | |
1529 | hidnplayr | 1562 | mov [eax + TCP_SOCKET.timer_persist], 0 ;;;; |
1514 | hidnplayr | 1563 | mov [eax + TCP_SOCKET.t_rxtshift], 0 |
1254 | hidnplayr | 1564 | |
1514 | hidnplayr | 1565 | .no_persist_timeout: |
1159 | hidnplayr | 1566 | |
1514 | hidnplayr | 1567 | ;;;106 |
1159 | hidnplayr | 1568 | |
1533 | hidnplayr | 1569 | mov esi, [eax + STREAM_SOCKET.snd + RING_BUFFER.size] |
1514 | hidnplayr | 1570 | cmp esi, ecx |
1571 | jl @f |
||
1572 | mov esi, ecx |
||
1573 | @@: |
||
1574 | sub esi, ebx |
||
1254 | hidnplayr | 1575 | |
1514 | hidnplayr | 1576 | cmp esi, -1 |
1577 | jne .not_minus_one |
||
1159 | hidnplayr | 1578 | |
1514 | hidnplayr | 1579 | ; If FIN has been set, but not ACKed, and we havent been called to retransmit, |
1580 | ; len (esi) will be -1 |
||
1581 | ; Otherwise, window shrank after we sent into it. |
||
1582 | ; If window shrank to 0, cancel pending retransmit and pull SND_NXT back to (closed) window |
||
1583 | ; We will enter persist state below. |
||
1584 | ; If window didn't close completely, just wait for an ACK |
||
1159 | hidnplayr | 1585 | |
1514 | hidnplayr | 1586 | xor esi, esi |
1159 | hidnplayr | 1587 | |
1514 | hidnplayr | 1588 | test ecx, ecx |
1589 | jnz @f |
||
1159 | hidnplayr | 1590 | |
1529 | hidnplayr | 1591 | mov [eax + TCP_SOCKET.timer_retransmission], 0 ; cancel retransmit |
1274 | hidnplayr | 1592 | |
1514 | hidnplayr | 1593 | push [eax + TCP_SOCKET.SND_UNA] |
1594 | pop [eax + TCP_SOCKET.SND_NXT] |
||
1595 | @@: |
||
1254 | hidnplayr | 1596 | |
1514 | hidnplayr | 1597 | .not_minus_one: |
1254 | hidnplayr | 1598 | |
1514 | hidnplayr | 1599 | ;;; 124 |
1159 | hidnplayr | 1600 | |
1514 | hidnplayr | 1601 | cmp esi, [eax + TCP_SOCKET.t_maxseg] |
1602 | jle @f |
||
1274 | hidnplayr | 1603 | |
1514 | hidnplayr | 1604 | mov esi, [eax + TCP_SOCKET.t_maxseg] |
1605 | ;sendalot = 1 |
||
1274 | hidnplayr | 1606 | |
1514 | hidnplayr | 1607 | @@: |
1274 | hidnplayr | 1608 | |
1514 | hidnplayr | 1609 | ;;; 128 |
1274 | hidnplayr | 1610 | |
1514 | hidnplayr | 1611 | mov edi, [eax + TCP_SOCKET.SND_NXT] |
1612 | add edi, esi ; len |
||
1613 | sub edi, [eax + TCP_SOCKET.SND_UNA] |
||
1533 | hidnplayr | 1614 | add edi, [eax + STREAM_SOCKET.snd + RING_BUFFER.size] |
1514 | hidnplayr | 1615 | cmp edi, 0 |
1616 | jle @f |
||
1274 | hidnplayr | 1617 | |
1514 | hidnplayr | 1618 | and dl, not (TH_FIN) ; clear the FIN flag |
1159 | hidnplayr | 1619 | |
1514 | hidnplayr | 1620 | @@: |
1159 | hidnplayr | 1621 | |
1622 | |||
1529 | hidnplayr | 1623 | ; set ecx to space available in receive buffer |
1624 | ; From now on, ecx will be the window we advertise to the other end |
||
1159 | hidnplayr | 1625 | |
1529 | hidnplayr | 1626 | mov ecx, SOCKET_MAXDATA |
1533 | hidnplayr | 1627 | sub ecx, [eax + STREAM_SOCKET.rcv + RING_BUFFER.size] |
1159 | hidnplayr | 1628 | |
1514 | hidnplayr | 1629 | ;------------------------------ |
1630 | ; Sender silly window avoidance |
||
1159 | hidnplayr | 1631 | |
1529 | hidnplayr | 1632 | cmp ecx, [eax + TCP_SOCKET.t_maxseg] |
1514 | hidnplayr | 1633 | je .send |
1274 | hidnplayr | 1634 | |
1514 | hidnplayr | 1635 | ;;; TODO: 144-145 |
1274 | hidnplayr | 1636 | |
1514 | hidnplayr | 1637 | test [eax + TCP_SOCKET.t_force], -1 |
1638 | jnz .send |
||
1274 | hidnplayr | 1639 | |
1529 | hidnplayr | 1640 | mov ebx, [eax + TCP_SOCKET.max_sndwnd] |
1641 | shr ebx, 1 |
||
1642 | cmp ecx, ebx |
||
1643 | jge .send |
||
1274 | hidnplayr | 1644 | |
1529 | hidnplayr | 1645 | mov ebx, [eax + TCP_SOCKET.SND_NXT] |
1646 | cmp ebx, [eax + TCP_SOCKET.SND_MAX] |
||
1647 | jl .send |
||
1254 | hidnplayr | 1648 | |
1514 | hidnplayr | 1649 | ;---------------------------------------- |
1650 | ; Check if a window update should be sent |
||
1159 | hidnplayr | 1651 | |
1529 | hidnplayr | 1652 | test ecx, ecx ; window |
1653 | jz .no_window |
||
1159 | hidnplayr | 1654 | |
1514 | hidnplayr | 1655 | ;;; TODO 154-172 |
1159 | hidnplayr | 1656 | |
1514 | hidnplayr | 1657 | .no_window: |
1159 | hidnplayr | 1658 | |
1514 | hidnplayr | 1659 | ;-------------------------- |
1660 | ; Should a segment be sent? |
||
1159 | hidnplayr | 1661 | |
1534 | hidnplayr | 1662 | test [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
1514 | hidnplayr | 1663 | jnz .send |
1159 | hidnplayr | 1664 | |
1514 | hidnplayr | 1665 | test dl, TH_SYN + TH_RST |
1666 | jnz .send |
||
1159 | hidnplayr | 1667 | |
1534 | hidnplayr | 1668 | mov ebx, [eax + TCP_SOCKET.SND_UP] |
1669 | cmp ebx, [eax + TCP_SOCKET.SND_UNA] |
||
1514 | hidnplayr | 1670 | jg .send |
1249 | hidnplayr | 1671 | |
1514 | hidnplayr | 1672 | test dl, TH_FIN |
1673 | jz .enter_persist |
||
1318 | hidnplayr | 1674 | |
1534 | hidnplayr | 1675 | test [eax + TCP_SOCKET.t_flags], TF_SENTFIN |
1514 | hidnplayr | 1676 | jnz .send |
1254 | hidnplayr | 1677 | |
1534 | hidnplayr | 1678 | mov ebx, [eax + TCP_SOCKET.SND_NXT] |
1679 | cmp ebx, [eax + TCP_SOCKET.SND_UNA] |
||
1514 | hidnplayr | 1680 | je .send |
1254 | hidnplayr | 1681 | |
1514 | hidnplayr | 1682 | ;-------------------- |
1683 | ; Enter persist state |
||
1318 | hidnplayr | 1684 | |
1514 | hidnplayr | 1685 | .enter_persist: |
1318 | hidnplayr | 1686 | |
1519 | hidnplayr | 1687 | DEBUGF 1,"Entering persist state\n" |
1318 | hidnplayr | 1688 | |
1514 | hidnplayr | 1689 | ;-------------------------------------- |
1690 | ; No reason to send a segment, just ret |
||
1318 | hidnplayr | 1691 | |
1514 | hidnplayr | 1692 | DEBUGF 1,"No reason to send a segment\n" |
1318 | hidnplayr | 1693 | |
1514 | hidnplayr | 1694 | ret |
1318 | hidnplayr | 1695 | |
1696 | |||
1514 | hidnplayr | 1697 | ;----------------------------------------------- |
1698 | ; |
||
1699 | ; Send a segment |
||
1700 | ; |
||
1529 | hidnplayr | 1701 | ; eax = socket pointer |
1514 | hidnplayr | 1702 | ; dl = flags |
1703 | ; |
||
1704 | ;----------------------------------------------- |
||
1318 | hidnplayr | 1705 | |
1529 | hidnplayr | 1706 | .send: |
1318 | hidnplayr | 1707 | |
1514 | hidnplayr | 1708 | DEBUGF 1,"Preparing to send a segment\n" |
1318 | hidnplayr | 1709 | |
1529 | hidnplayr | 1710 | mov edi, TCP_segment.Data ; edi will contain headersize |
1318 | hidnplayr | 1711 | |
1529 | hidnplayr | 1712 | sub esp, 8 ; create some space on stack |
1713 | push eax ; save this too.. |
||
1714 | |||
1514 | hidnplayr | 1715 | ;------------------------------------ |
1716 | ; Send options with first SYN segment |
||
1318 | hidnplayr | 1717 | |
1514 | hidnplayr | 1718 | test dl, TH_SYN |
1719 | jz .no_options |
||
1318 | hidnplayr | 1720 | |
1529 | hidnplayr | 1721 | push [eax + TCP_SOCKET.ISS] |
1722 | pop [eax + TCP_SOCKET.SND_NXT] |
||
1318 | hidnplayr | 1723 | |
1529 | hidnplayr | 1724 | test [eax + TCP_SOCKET.t_flags], TF_NOOPT |
1514 | hidnplayr | 1725 | jnz .no_options |
1318 | hidnplayr | 1726 | |
1529 | hidnplayr | 1727 | mov ecx, 1460 |
1728 | or ecx, TCP_OPT_MAXSEG shl 24 + 4 shl 16 |
||
1729 | bswap ecx |
||
1730 | push ecx |
||
1731 | add di, 4 |
||
1514 | hidnplayr | 1732 | |
1529 | hidnplayr | 1733 | test [eax + TCP_SOCKET.t_flags], TF_REQ_SCALE |
1514 | hidnplayr | 1734 | jz .no_syn |
1735 | |||
1736 | test dl, TH_ACK |
||
1737 | jnz .scale_opt |
||
1738 | |||
1529 | hidnplayr | 1739 | test [eax + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
1514 | hidnplayr | 1740 | jz .no_syn |
1741 | |||
1742 | .scale_opt: |
||
1529 | hidnplayr | 1743 | movzx ecx, byte [eax + TCP_SOCKET.request_r_scale] |
1744 | or ecx, TCP_OPT_WINDOW shl 24 + 4 shl 16 + TCP_OPT_NOP shl 8 |
||
1745 | bswap ecx |
||
1746 | pushd ecx |
||
1514 | hidnplayr | 1747 | add di, 4 |
1159 | hidnplayr | 1748 | |
1514 | hidnplayr | 1749 | .no_syn: |
1159 | hidnplayr | 1750 | |
1514 | hidnplayr | 1751 | ;------------------------------------ |
1752 | ; Make the timestamp option if needed |
||
1159 | hidnplayr | 1753 | |
1529 | hidnplayr | 1754 | test [eax + TCP_SOCKET.t_flags], TF_REQ_TSTMP |
1514 | hidnplayr | 1755 | jz .no_timestamp |
1159 | hidnplayr | 1756 | |
1514 | hidnplayr | 1757 | test dl, TH_RST |
1758 | jnz .no_timestamp |
||
1759 | |||
1760 | test dl, TH_ACK |
||
1761 | jz .timestamp |
||
1762 | |||
1529 | hidnplayr | 1763 | test [eax + TCP_SOCKET.t_flags], TF_RCVD_TSTMP |
1514 | hidnplayr | 1764 | jz .no_timestamp |
1765 | |||
1766 | .timestamp: |
||
1529 | hidnplayr | 1767 | mov esi, [timer_ticks] |
1768 | bswap esi |
||
1769 | push esi |
||
1514 | hidnplayr | 1770 | pushw 0 |
1529 | hidnplayr | 1771 | pushd TCP_OPT_TIMESTAMP + 10 shl 8 + TCP_OPT_NOP shl 16 + TCP_OPT_NOP shl 24 |
1514 | hidnplayr | 1772 | add di, 10 |
1773 | |||
1774 | .no_timestamp: |
||
1775 | ;; TODO: check if we dont exceed the max segment size |
||
1776 | |||
1777 | .no_options: |
||
1529 | hidnplayr | 1778 | ; eax = socket ptr |
1779 | ; edx = flags |
||
1780 | ; ecx = data size |
||
1781 | ; edi = header size |
||
1782 | ; esi = snd ring buff ptr |
||
1514 | hidnplayr | 1783 | |
1533 | hidnplayr | 1784 | mov ecx, [eax + STREAM_SOCKET.snd + RING_BUFFER.size] |
1785 | cmp ecx, [eax + TCP_SOCKET.t_maxseg] ;;; right? |
||
1786 | jle @f |
||
1787 | mov ecx, [eax + TCP_SOCKET.t_maxseg] |
||
1788 | @@: |
||
1514 | hidnplayr | 1789 | add ecx, edi ; total TCP segment size |
1790 | |||
1529 | hidnplayr | 1791 | ; Start by pushing all TCP header values in reverse order on stack |
1792 | ; (essentially, creating the tcp header!) |
||
1514 | hidnplayr | 1793 | |
1529 | hidnplayr | 1794 | pushw 0 ; .UrgentPointer dw ? |
1795 | pushw 0 ; .Checksum dw ? |
||
1796 | pushw 0x00a0 ; .Window dw ? ;;;;;;; |
||
1797 | shl edi, 2 ; .DataOffset db ? only 4 left-most bits |
||
1798 | shl dx, 8 |
||
1799 | or dx, di ; .Flags db ? |
||
1800 | pushw dx |
||
1801 | shr edi, 2 ; .DataOffset db ? ;;;; |
||
1514 | hidnplayr | 1802 | |
1529 | hidnplayr | 1803 | push [eax + TCP_SOCKET.RCV_NXT] ; .AckNumber dd ? |
1804 | ntohld [esp] |
||
1159 | hidnplayr | 1805 | |
1529 | hidnplayr | 1806 | push [eax + TCP_SOCKET.SND_NXT] ; .SequenceNumber dd ? |
1807 | ntohld [esp] |
||
1159 | hidnplayr | 1808 | |
1529 | hidnplayr | 1809 | push [eax + TCP_SOCKET.RemotePort] ; .DestinationPort dw ? |
1810 | ntohlw [esp] |
||
1249 | hidnplayr | 1811 | |
1529 | hidnplayr | 1812 | push [eax + TCP_SOCKET.LocalPort] ; .SourcePort dw ? |
1813 | ntohlw [esp] |
||
1274 | hidnplayr | 1814 | |
1533 | hidnplayr | 1815 | push edi ; header size |
1274 | hidnplayr | 1816 | |
1529 | hidnplayr | 1817 | ; Create the IP packet |
1818 | mov ebx, [eax + IP_SOCKET.LocalIP] ; source ip |
||
1819 | mov eax, [eax + IP_SOCKET.RemoteIP] ; dest ip |
||
1820 | mov di, IP_PROTO_TCP shl 8 + 128 |
||
1821 | call IPv4_output |
||
1822 | jz .fail |
||
1274 | hidnplayr | 1823 | |
1529 | hidnplayr | 1824 | ;----------------------------------------- |
1825 | ; Move TCP header from stack to TCP packet |
||
1274 | hidnplayr | 1826 | |
1533 | hidnplayr | 1827 | push ecx |
1828 | mov ecx, [esp+4] |
||
1829 | lea esi, [esp+4+4] |
||
1529 | hidnplayr | 1830 | shr ecx, 2 |
1831 | rep movsd |
||
1533 | hidnplayr | 1832 | pop ecx ; full TCP packet size |
1274 | hidnplayr | 1833 | |
1533 | hidnplayr | 1834 | pop esi ; headersize |
1835 | add esp, esi |
||
1254 | hidnplayr | 1836 | |
1533 | hidnplayr | 1837 | mov [esp + 4], eax ; packet ptr |
1530 | hidnplayr | 1838 | mov [esp + 4+4], edx ; packet size |
1254 | hidnplayr | 1839 | |
1533 | hidnplayr | 1840 | mov edx, edi ; begin of data |
1841 | sub edx, esi ; begin of packet (edi = begin of data) |
||
1842 | push ecx |
||
1843 | sub ecx, esi ; data size |
||
1159 | hidnplayr | 1844 | |
1514 | hidnplayr | 1845 | ;-------------- |
1846 | ; Copy the data |
||
1159 | hidnplayr | 1847 | |
1529 | hidnplayr | 1848 | ; eax = ptr to ring struct |
1849 | ; ecx = buffer size |
||
1850 | ; edi = ptr to buffer |
||
1249 | hidnplayr | 1851 | |
1533 | hidnplayr | 1852 | mov eax, [esp+4] ; socket ptr |
1853 | push edx |
||
1854 | add eax, STREAM_SOCKET.snd |
||
1529 | hidnplayr | 1855 | call SOCKET_ring_read |
1856 | pop esi ecx |
||
1857 | pop eax |
||
1254 | hidnplayr | 1858 | |
1533 | hidnplayr | 1859 | test [esi + TCP_segment.Flags], TH_SYN + TH_FIN |
1860 | jz @f |
||
1861 | inc [eax + TCP_SOCKET.SND_NXT] |
||
1862 | ;;; TODO: update sentfin flag |
||
1863 | @@: |
||
1254 | hidnplayr | 1864 | |
1533 | hidnplayr | 1865 | ;; add [eax + TCP_SOCKET.SND_NXT], ecx |
1866 | |||
1867 | mov edx, [eax + TCP_SOCKET.SND_NXT] |
||
1868 | cmp edx, [eax + TCP_SOCKET.SND_MAX] |
||
1869 | jle @f |
||
1870 | mov [eax + TCP_SOCKET.SND_MAX], edx |
||
1871 | |||
1872 | ;;;; TODO: time transmission (420) |
||
1873 | @@: |
||
1874 | |||
1875 | ;;; TODO: set retransmission timer |
||
1876 | |||
1877 | ;-------------------- |
||
1878 | ; Create the checksum |
||
1879 | |||
1529 | hidnplayr | 1880 | DEBUGF 1,"checksum: ptr=%x size=%u\n", esi, ecx |
1159 | hidnplayr | 1881 | |
1529 | hidnplayr | 1882 | TCP_checksum (eax + IP_SOCKET.LocalIP), (eax + IP_SOCKET.RemoteIP) |
1883 | mov [esi+TCP_segment.Checksum], dx |
||
1884 | |||
1514 | hidnplayr | 1885 | ;---------------- |
1886 | ; Send the packet |
||
1159 | hidnplayr | 1887 | |
1529 | hidnplayr | 1888 | DEBUGF 1,"Sending TCP Packet to device %x\n", ebx |
1889 | call [ebx + NET_DEVICE.transmit] |
||
1890 | ret |
||
1159 | hidnplayr | 1891 | |
1514 | hidnplayr | 1892 | |
1529 | hidnplayr | 1893 | .fail: |
1894 | pop ecx |
||
1895 | add esp, ecx |
||
1896 | add esp, 4+4+8+4 |
||
1897 | DEBUGF 1,"TCP_output: failed\n" |
||
1159 | hidnplayr | 1898 | ret |
1899 | |||
1529 | hidnplayr | 1900 | |
1901 | |||
1514 | hidnplayr | 1902 | ;------------------------- |
1903 | ; |
||
1904 | ; TCP_outflags |
||
1905 | ; |
||
1906 | ; IN: eax = socket ptr |
||
1907 | ; |
||
1908 | ; OUT: edx = flags |
||
1909 | ; |
||
1910 | ;------------------------- |
||
1249 | hidnplayr | 1911 | align 4 |
1514 | hidnplayr | 1912 | TCP_outflags: |
1254 | hidnplayr | 1913 | |
1514 | hidnplayr | 1914 | mov edx, [eax + TCP_SOCKET.t_state] |
1915 | movzx edx, byte [edx + .flaglist] |
||
1254 | hidnplayr | 1916 | |
1514 | hidnplayr | 1917 | DEBUGF 1,"TCP_outflags, socket: %x, flags: %x\n", eax, dl |
1918 | |||
1159 | hidnplayr | 1919 | ret |
1920 | |||
1514 | hidnplayr | 1921 | .flaglist: |
1159 | hidnplayr | 1922 | |
1514 | hidnplayr | 1923 | db TH_RST + TH_ACK ; TCB_CLOSED |
1924 | db 0 ; TCB_LISTEN |
||
1925 | db TH_SYN ; TCB_SYN_SENT |
||
1926 | db TH_SYN + TH_ACK ; TCB_SYN_RECEIVED |
||
1927 | db TH_ACK ; TCB_ESTABLISHED |
||
1928 | db TH_ACK ; TCB_CLOSE_WAIT |
||
1929 | db TH_SYN + TH_ACK ; TCB_FIN_WAIT_1 |
||
1930 | db TH_SYN + TH_ACK ; TCB_CLOSING |
||
1931 | db TH_SYN + TH_ACK ; TCB_LAST_ACK |
||
1932 | db TH_ACK ; TCB_FIN_WAIT_2 |
||
1933 | db TH_ACK ; TCB_TIMED_WAIT |
||
1249 | hidnplayr | 1934 | |
1514 | hidnplayr | 1935 | |
1529 | hidnplayr | 1936 | |
1937 | |||
1514 | hidnplayr | 1938 | ;------------------------- |
1939 | ; |
||
1940 | ; TCP_drop |
||
1941 | ; |
||
1942 | ; IN: eax = socket ptr |
||
1943 | ; |
||
1944 | ; OUT: / |
||
1945 | ; |
||
1946 | ;------------------------- |
||
1249 | hidnplayr | 1947 | align 4 |
1514 | hidnplayr | 1948 | TCP_drop: |
1254 | hidnplayr | 1949 | |
1514 | hidnplayr | 1950 | DEBUGF 1,"TCP_drop\n" |
1254 | hidnplayr | 1951 | |
1514 | hidnplayr | 1952 | ; cmp [eax + TCP_SOCKET.t_state], TCB_SYN_RECEIVED |
1953 | ; jl .no_syn_received |
||
1159 | hidnplayr | 1954 | |
1514 | hidnplayr | 1955 | mov [eax + TCP_SOCKET.t_state], TCB_CLOSED |
1159 | hidnplayr | 1956 | |
1514 | hidnplayr | 1957 | call TCP_output |
1254 | hidnplayr | 1958 | |
1514 | hidnplayr | 1959 | ; .no_syn_received: |
1960 | |||
1159 | hidnplayr | 1961 | ret |
1962 | |||
1963 | |||
1254 | hidnplayr | 1964 | |
1965 | |||
1159 | hidnplayr | 1966 | |
1514 | hidnplayr | 1967 | ;--------------------------------------- |
1968 | ; |
||
1519 | hidnplayr | 1969 | ; The easy way to send an ACK/RST/keepalive segment |
1514 | hidnplayr | 1970 | ; |
1529 | hidnplayr | 1971 | ; TCP_respond_socket: |
1972 | ; |
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1973 | ; IN: ebx = socket ptr |
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1519 | hidnplayr | 1974 | ; cl = flags |
1514 | hidnplayr | 1975 | ; |
1529 | hidnplayr | 1976 | ;-------------------------------------- |
1514 | hidnplayr | 1977 | align 4 |
1529 | hidnplayr | 1978 | TCP_respond_socket: |
1254 | hidnplayr | 1979 | |
1529 | hidnplayr | 1980 | DEBUGF 1,"TCP_respond_socket\n" |
1159 | hidnplayr | 1981 | |
1519 | hidnplayr | 1982 | ;--------------------- |
1983 | ; Create the IP packet |
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1984 | |||
1529 | hidnplayr | 1985 | push cx ebx |
1986 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
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1987 | mov ebx, [ebx + IP_SOCKET.LocalIP] |
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1519 | hidnplayr | 1988 | mov ecx, TCP_segment.Data |
1529 | hidnplayr | 1989 | mov di , IP_PROTO_TCP shl 8 + 128 |
1990 | call IPv4_output |
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1519 | hidnplayr | 1991 | test edi, edi |
1992 | jz .error |
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1529 | hidnplayr | 1993 | pop esi cx |
1994 | push edx eax |
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1519 | hidnplayr | 1995 | |
1529 | hidnplayr | 1996 | ;----------------------------------------------- |
1997 | ; Fill in the TCP header by using the socket ptr |
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1519 | hidnplayr | 1998 | |
1529 | hidnplayr | 1999 | mov ax, [esi + TCP_SOCKET.LocalPort] |
2000 | rol ax, 8 |
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2001 | stosw |
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2002 | mov ax, [esi + TCP_SOCKET.RemotePort] |
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2003 | rol ax, 8 |
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2004 | stosw |
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2005 | mov eax, [esi + TCP_SOCKET.SND_NXT] |
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2006 | bswap eax |
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2007 | stosd |
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2008 | mov eax, [esi + TCP_SOCKET.RCV_NXT] |
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2009 | bswap eax |
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2010 | stosd |
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2011 | mov al, 0x50 ; Dataoffset: 20 bytes |
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2012 | stosb |
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2013 | mov al, cl |
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2014 | stosb |
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2015 | mov ax, [esi + TCP_SOCKET.RCV_WND] |
||
2016 | rol ax, 8 |
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2017 | stosw ; window |
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2018 | xor eax, eax |
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2019 | stosd ; checksum + urgentpointer |
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1519 | hidnplayr | 2020 | |
2021 | ;--------------------- |
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2022 | ; Fill in the checksum |
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2023 | |||
2024 | .checksum: |
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1529 | hidnplayr | 2025 | sub edi, TCP_segment.Data |
2026 | mov ecx, TCP_segment.Data |
||
2027 | xchg esi, edi |
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2028 | TCP_checksum (edi + IP_SOCKET.LocalIP), (esi + IP_SOCKET.RemoteIP) |
||
2029 | mov [esi+TCP_segment.Checksum], dx |
||
1519 | hidnplayr | 2030 | |
2031 | ;-------------------- |
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2032 | ; And send the segment |
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2033 | |||
2034 | call [ebx + NET_DEVICE.transmit] |
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1159 | hidnplayr | 2035 | ret |
2036 | |||
1519 | hidnplayr | 2037 | .error: |
1529 | hidnplayr | 2038 | DEBUGF 1,"TCP_respond failed\n" |
2039 | add esp, 2+4 |
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1159 | hidnplayr | 2040 | |
1519 | hidnplayr | 2041 | ret |
1514 | hidnplayr | 2042 | |
1529 | hidnplayr | 2043 | |
2044 | |||
2045 | ;------------------------- |
||
2046 | ; TCP_respond.segment: |
||
2047 | ; |
||
2048 | ; IN: edx = segment ptr (a previously received segment) |
||
2049 | ; cl = flags |
||
2050 | |||
2051 | align 4 |
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2052 | TCP_respond_segment: |
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2053 | |||
2054 | DEBUGF 1,"TCP_respond_segment\n" |
||
2055 | |||
2056 | ;--------------------- |
||
2057 | ; Create the IP packet |
||
2058 | |||
2059 | push cx edx |
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2060 | mov ebx, [edx - 20 + IPv4_Packet.SourceAddress] ;;;; and what if ip packet had options?! |
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2061 | mov eax, [edx - 20 + IPv4_Packet.DestinationAddress] ;;; |
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2062 | mov ecx, TCP_segment.Data |
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2063 | mov di , IP_PROTO_TCP shl 8 + 128 |
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2064 | call IPv4_output |
||
2065 | jz .error |
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1533 | hidnplayr | 2066 | pop esi cx |
1529 | hidnplayr | 2067 | |
2068 | push edx eax |
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2069 | |||
1519 | hidnplayr | 2070 | ;--------------------------------------------------- |
2071 | ; Fill in the TCP header by using a received segment |
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2072 | |||
2073 | mov ax, [esi + TCP_segment.DestinationPort] |
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2074 | rol ax, 8 |
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2075 | stosw |
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2076 | mov ax, [esi + TCP_segment.SourcePort] |
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2077 | rol ax, 8 |
||
2078 | stosw |
||
2079 | mov eax, [esi + TCP_segment.AckNumber] |
||
2080 | bswap eax |
||
2081 | stosd |
||
2082 | xor eax, eax |
||
2083 | stosd |
||
2084 | mov al, 0x50 ; Dataoffset: 20 bytes |
||
2085 | stosb |
||
2086 | mov al, cl |
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2087 | stosb |
||
2088 | mov ax, 1280 |
||
2089 | rol ax, 8 |
||
2090 | stosw ; window |
||
2091 | xor eax, eax |
||
2092 | stosd ; checksum + urgentpointer |
||
2093 | |||
1529 | hidnplayr | 2094 | ;--------------------- |
2095 | ; Fill in the checksum |
||
1519 | hidnplayr | 2096 | |
1529 | hidnplayr | 2097 | .checksum: |
2098 | lea esi, [edi - TCP_segment.Data] |
||
2099 | mov ecx, TCP_segment.Data |
||
2100 | TCP_checksum (esi - 20 + IPv4_Packet.DestinationAddress), (esi - 20 + IPv4_Packet.DestinationAddress) |
||
2101 | mov [esi+TCP_segment.Checksum], dx |
||
1519 | hidnplayr | 2102 | |
1529 | hidnplayr | 2103 | ;-------------------- |
2104 | ; And send the segment |
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1519 | hidnplayr | 2105 | |
1529 | hidnplayr | 2106 | call [ebx + NET_DEVICE.transmit] |
2107 | ret |
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1519 | hidnplayr | 2108 | |
1529 | hidnplayr | 2109 | .error: |
2110 | DEBUGF 1,"TCP_respond failed\n" |
||
2111 | add esp, 2+4 |
||
1519 | hidnplayr | 2112 | |
2113 | ret |
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2114 | |||
2115 | |||
2116 | |||
1254 | hidnplayr | 2117 | |
2118 | ;--------------------------------------------------------------------------- |
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2119 | ; |
||
2120 | ; TCP_API |
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2121 | ; |
||
2122 | ; This function is called by system function 75 |
||
2123 | ; |
||
2124 | ; IN: subfunction number in bl |
||
2125 | ; device number in bh |
||
2126 | ; ecx, edx, .. depends on subfunction |
||
2127 | ; |
||
2128 | ; OUT: |
||
2129 | ; |
||
2130 | ;--------------------------------------------------------------------------- |
||
2131 | align 4 |
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2132 | TCP_API: |
||
2133 | |||
2134 | movzx eax, bh |
||
2135 | shl eax, 2 |
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2136 | |||
2137 | test bl, bl |
||
2138 | jz .packets_tx ; 0 |
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2139 | dec bl |
||
2140 | jz .packets_rx ; 1 |
||
2141 | |||
2142 | .error: |
||
2143 | mov eax, -1 |
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2144 | ret |
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2145 | |||
2146 | .packets_tx: |
||
1514 | hidnplayr | 2147 | add eax, TCP_segments_tx |
1254 | hidnplayr | 2148 | mov eax, [eax] |
2149 | ret |
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2150 | |||
2151 | .packets_rx: |
||
1514 | hidnplayr | 2152 | add eax, TCP_segments_rx |
1254 | hidnplayr | 2153 | mov eax, [eax] |
2154 | ret |