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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: 1519 $ |
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 | |||
76 | |||
1514 | hidnplayr | 77 | struct TCP_segment |
1159 | hidnplayr | 78 | .SourcePort dw ? |
79 | .DestinationPort dw ? |
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80 | .SequenceNumber dd ? |
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81 | .AckNumber dd ? |
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1196 | hidnplayr | 82 | .DataOffset db ? ; DataOffset[0-3 bits] and Reserved[4-7] |
83 | .Flags db ? ; Reserved[0-1 bits]|URG|ACK|PSH|RST|SYN|FIN |
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1159 | hidnplayr | 84 | .Window dw ? |
85 | .Checksum dw ? |
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86 | .UrgentPointer dw ? |
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1514 | hidnplayr | 87 | .Data: ; ..or options |
1159 | hidnplayr | 88 | ends |
89 | |||
1274 | hidnplayr | 90 | struct tcp_in_queue_entry |
91 | .data_ptr dd ? |
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92 | .data_size dd ? |
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1514 | hidnplayr | 93 | .offset dd ? |
1274 | hidnplayr | 94 | .size: |
95 | ends |
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96 | |||
97 | struct tcp_out_queue_entry |
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98 | .data_ptr dd ? |
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99 | .data_size dd ? |
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1514 | hidnplayr | 100 | |
1274 | hidnplayr | 101 | .size: |
102 | ends |
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103 | |||
1196 | hidnplayr | 104 | align 4 |
105 | uglobal |
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1514 | hidnplayr | 106 | TCP_segments_tx rd IP_MAX_INTERFACES |
107 | TCP_segments_rx rd IP_MAX_INTERFACES |
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108 | TCP_bytes_rx rq IP_MAX_INTERFACES |
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109 | TCP_bytes_tx rq IP_MAX_INTERFACES |
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110 | TCP_sequence_num dd ? |
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1196 | hidnplayr | 111 | endg |
112 | |||
113 | |||
114 | ;----------------------------------------------------------------- |
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115 | ; |
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116 | ; TCP_init |
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117 | ; |
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118 | ; This function resets all TCP variables |
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119 | ; |
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120 | ; IN: / |
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121 | ; OUT: / |
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122 | ; |
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123 | ;----------------------------------------------------------------- |
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124 | align 4 |
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125 | TCP_init: |
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126 | |||
127 | xor eax, eax |
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1514 | hidnplayr | 128 | mov edi, TCP_segments_tx |
129 | mov ecx, (6*IP_MAX_INTERFACES) |
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1196 | hidnplayr | 130 | rep stosd |
131 | |||
1519 | hidnplayr | 132 | mov [TCP_sequence_num], 1 |
1196 | hidnplayr | 133 | |
134 | ret |
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135 | |||
136 | |||
1519 | hidnplayr | 137 | ;---------------------- |
1196 | hidnplayr | 138 | ; |
1159 | hidnplayr | 139 | ; |
1519 | hidnplayr | 140 | ;---------------------- |
1196 | hidnplayr | 141 | align 4 |
1519 | hidnplayr | 142 | TCP_timer_160ms: |
1159 | hidnplayr | 143 | |
1514 | hidnplayr | 144 | mov eax, net_sockets |
145 | .loop: |
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146 | mov eax, [eax + SOCKET.NextPtr] |
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147 | or eax, eax |
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1159 | hidnplayr | 148 | jz .exit |
149 | |||
1514 | hidnplayr | 150 | cmp [eax + SOCKET.Type], IP_PROTO_TCP |
151 | jne .loop |
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1249 | hidnplayr | 152 | |
1519 | hidnplayr | 153 | dec [eax + TCP_SOCKET.timer_ack] |
1514 | hidnplayr | 154 | jnz .loop |
1159 | hidnplayr | 155 | |
1519 | hidnplayr | 156 | DEBUGF 1,"TCP ack for socket %x expired, time to piggyback!\n", eax |
1159 | hidnplayr | 157 | |
1519 | hidnplayr | 158 | push eax |
159 | call TCP_respond |
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1514 | hidnplayr | 160 | pop eax |
1159 | hidnplayr | 161 | |
1519 | hidnplayr | 162 | jmp .loop |
1159 | hidnplayr | 163 | |
164 | .exit: |
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1519 | hidnplayr | 165 | |
1159 | hidnplayr | 166 | ret |
167 | |||
168 | |||
1519 | hidnplayr | 169 | ;----------------------------------------------------------------- |
1159 | hidnplayr | 170 | ; |
171 | ; |
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1519 | hidnplayr | 172 | ;----------------------------------------------------------------- |
1196 | hidnplayr | 173 | align 4 |
1519 | hidnplayr | 174 | TCP_timer_640ms: |
1159 | hidnplayr | 175 | |
1519 | hidnplayr | 176 | ; Update TCP sequence number |
177 | |||
1514 | hidnplayr | 178 | add [TCP_sequence_num], 64000 |
1159 | hidnplayr | 179 | |
1519 | hidnplayr | 180 | ; scan through all the active TCP sockets, decrementing ALL timers |
181 | ; 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 | 182 | |
1519 | hidnplayr | 183 | mov eax, net_sockets |
184 | .loop: |
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185 | mov eax, [eax + SOCKET.NextPtr] |
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186 | .check_only: |
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187 | or eax, eax |
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188 | jz .exit |
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1159 | hidnplayr | 189 | |
1519 | hidnplayr | 190 | cmp [eax + SOCKET.Type], IP_PROTO_TCP |
191 | jne .loop |
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1159 | hidnplayr | 192 | |
1519 | hidnplayr | 193 | dec [eax + TCP_SOCKET.timer_retransmission] |
194 | jnz .check_more2 |
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1254 | hidnplayr | 195 | |
1519 | hidnplayr | 196 | DEBUGF 1,"socket %x: Retransmission timer expired\n", eax |
1159 | hidnplayr | 197 | |
1519 | hidnplayr | 198 | push eax |
199 | call TCP_output |
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200 | pop eax |
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1159 | hidnplayr | 201 | |
1519 | hidnplayr | 202 | .check_more2: |
203 | dec [eax + TCP_SOCKET.timer_keepalive] |
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204 | jnz .check_more3 |
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1159 | hidnplayr | 205 | |
1519 | hidnplayr | 206 | DEBUGF 1,"socket %x: Keepalive expired\n", eax |
1159 | hidnplayr | 207 | |
1519 | hidnplayr | 208 | ;;; TODO: check socket state and handle accordingly |
1318 | hidnplayr | 209 | |
1519 | hidnplayr | 210 | .check_more3: |
211 | dec [eax + TCP_SOCKET.timer_timed_wait] |
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212 | jnz .check_more5 |
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213 | |||
214 | DEBUGF 1,"socket %x: 2MSL timer expired\n", eax |
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215 | |||
216 | .check_more5: |
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217 | dec [eax + TCP_SOCKET.timer_persist] |
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218 | jnz .loop |
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219 | |||
220 | DEBUGF 1,"socket %x: persist timer expired\n", eax |
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221 | |||
222 | jmp .loop |
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223 | .exit: |
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224 | ret |
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225 | |||
226 | |||
1249 | hidnplayr | 227 | ;----------------------------------------------------------------- |
228 | ; |
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1514 | hidnplayr | 229 | ; TCP_input: |
1159 | hidnplayr | 230 | ; |
1514 | hidnplayr | 231 | ; IN: [esp] = ptr to buffer |
232 | ; [esp+4] = buffer size |
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233 | ; ebx = ptr to device struct |
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234 | ; ecx = segment size |
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235 | ; edx = ptr to TCP segment |
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1196 | hidnplayr | 236 | ; |
1514 | hidnplayr | 237 | ; esi = ipv4 source address |
238 | ; edi = ipv4 dest address |
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239 | ; |
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1196 | hidnplayr | 240 | ; OUT: / |
241 | ; |
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242 | ;----------------------------------------------------------------- |
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1249 | hidnplayr | 243 | align 4 |
1514 | hidnplayr | 244 | TCP_input: |
1159 | hidnplayr | 245 | |
1514 | hidnplayr | 246 | DEBUGF 1,"TCP_input\n" |
1196 | hidnplayr | 247 | |
1514 | hidnplayr | 248 | ; 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 | 249 | |
1514 | hidnplayr | 250 | movzx eax, [edx + TCP_segment.DataOffset] |
251 | and eax, 0xf0 |
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252 | shr al , 2 |
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253 | |||
254 | DEBUGF 1,"data offset: %u\n", eax |
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255 | |||
256 | cmp eax, 20 |
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257 | jl .drop |
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258 | |||
259 | cmp eax, ecx |
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260 | jg .drop |
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261 | |||
262 | ;------------------------------- |
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263 | ; Now, re-calculate the checksum |
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264 | |||
265 | push eax edx ebx |
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266 | |||
267 | push edi |
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268 | push esi |
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269 | mov esi, edx |
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270 | call TCP_checksum ; this destroys edx, ecx and esi (but not edi! :) |
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271 | |||
272 | pop ebx edx eax |
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273 | |||
274 | cmp [edx + TCP_segment.Checksum], 0 |
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275 | jnz .drop |
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276 | |||
277 | DEBUGF 1,"Checksum is correct\n" |
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278 | |||
279 | ;----------------------------------------------------------------------------------------- |
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280 | ; Check if this packet has a timestamp option (We do it here so we can process it quickly) |
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281 | |||
282 | cmp eax, 20 + 12 ; Timestamp option is 12 bytes |
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283 | jl .no_timestamp |
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284 | je .is_ok |
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285 | |||
286 | cmp byte [edx + TCP_segment.Data + 12], 0 ; end of option list |
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287 | jne .no_timestamp |
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288 | |||
289 | .is_ok: |
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290 | test [edx + TCP_segment.Flags], TH_SYN ; SYN flag must not be set |
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291 | jnz .no_timestamp |
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292 | |||
293 | cmp dword [edx + TCP_segment.Data], 0x0101080a ; Timestamp header |
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294 | jne .no_timestamp |
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295 | |||
296 | DEBUGF 1,"timestamp ok\n" |
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297 | |||
298 | ; TODO: Parse the options |
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299 | ; TODO: Set a Bit in the TCP to tell all options are parsed |
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300 | |||
301 | ret |
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302 | |||
303 | .no_timestamp: |
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304 | |||
305 | ;------------------------------------------- |
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306 | ; Convert Big-endian values to little endian |
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307 | |||
308 | ntohld [edx + TCP_segment.SequenceNumber] |
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309 | ntohld [edx + TCP_segment.AckNumber] |
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310 | |||
311 | ntohlw [edx + TCP_segment.Window] |
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312 | ntohlw [edx + TCP_segment.UrgentPointer] |
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313 | |||
314 | ;------------------------------------------------------------ |
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315 | ; Next thing to do is find the TCB (thus, the socket pointer) |
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316 | |||
1274 | hidnplayr | 317 | ; IP Packet TCP Destination Port = local Port |
1514 | hidnplayr | 318 | ; (IP Packet SenderAddress = Remote IP) OR (Remote IP = 0) |
1318 | hidnplayr | 319 | ; (IP Packet TCP Source Port = remote Port) OR (remote Port = 0) |
1159 | hidnplayr | 320 | |
321 | mov ebx, net_sockets |
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322 | |||
1249 | hidnplayr | 323 | .socket_loop: |
1514 | hidnplayr | 324 | mov ebx, [ebx + SOCKET.NextPtr] |
1159 | hidnplayr | 325 | or ebx, ebx |
1514 | hidnplayr | 326 | jz .drop_with_reset |
1159 | hidnplayr | 327 | |
1514 | hidnplayr | 328 | cmp [ebx + SOCKET.Type], IP_PROTO_TCP |
1249 | hidnplayr | 329 | jne .socket_loop |
1159 | hidnplayr | 330 | |
1514 | hidnplayr | 331 | mov ax, [edx + TCP_segment.DestinationPort] |
332 | cmp [ebx + TCP_SOCKET.LocalPort], ax |
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333 | jne .socket_loop |
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334 | |||
335 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
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1249 | hidnplayr | 336 | cmp eax, esi |
337 | je @f |
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338 | test eax, eax |
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1514 | hidnplayr | 339 | jnz .socket_loop |
1249 | hidnplayr | 340 | @@: |
1159 | hidnplayr | 341 | |
1514 | hidnplayr | 342 | mov ax, [ebx + TCP_SOCKET.RemotePort] |
343 | cmp [edx + TCP_segment.SourcePort] , ax |
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1274 | hidnplayr | 344 | je .found_socket |
1249 | hidnplayr | 345 | test ax, ax |
1254 | hidnplayr | 346 | jnz .socket_loop |
1274 | hidnplayr | 347 | .found_socket: |
1514 | hidnplayr | 348 | DEBUGF 1,"Socket ptr: %x\n", ebx |
1254 | hidnplayr | 349 | |
1514 | hidnplayr | 350 | ; ebx now contains the pointer to the socket |
1257 | hidnplayr | 351 | |
1514 | hidnplayr | 352 | ;---------------------------- |
353 | ; Check if socket isnt closed |
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354 | |||
355 | cmp [TCP_SOCKET.t_state], TCB_CLOSED |
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356 | je .drop |
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357 | |||
358 | ;---------------- |
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359 | ; Lock the socket |
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360 | |||
361 | add ebx, SOCKET.lock ; TODO: figure out if we should lock now already |
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1249 | hidnplayr | 362 | call wait_mutex |
1514 | hidnplayr | 363 | sub ebx, SOCKET.lock |
1159 | hidnplayr | 364 | |
1514 | hidnplayr | 365 | ;--------------------------------------- |
366 | ; unscale the window into a 32 bit value ;;;;;; |
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1159 | hidnplayr | 367 | |
1514 | hidnplayr | 368 | movzx eax, [edx + TCP_segment.Window] |
369 | xchg al, ah |
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370 | |||
371 | test [edx + TCP_segment.Flags], TH_SYN |
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372 | jnz .no_syn |
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373 | |||
374 | mov cl , [ebx + TCP_SOCKET.SND_SCALE] |
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375 | shl eax, cl |
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376 | |||
377 | .no_syn: |
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378 | |||
379 | ;----------------------------------- |
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380 | ; Is this socket a listening socket? |
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381 | |||
382 | ; If so, create a new socket |
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383 | |||
384 | test [ebx + SOCKET.options], SO_ACCEPTCON |
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385 | jz .no_accept_conn |
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386 | |||
387 | |||
388 | ; TODO: create a new socket |
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389 | |||
390 | |||
391 | .no_accept_conn: |
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392 | |||
393 | ;---------------------------- |
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394 | ; Compute window scale factor |
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395 | |||
396 | |||
397 | ; TODO |
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398 | |||
399 | |||
400 | ;------------------------------------- |
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401 | ; Reset idle timer and keepalive timer |
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402 | |||
1519 | hidnplayr | 403 | ;;;; TODO: idle timer? |
1514 | hidnplayr | 404 | |
1519 | hidnplayr | 405 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval |
1514 | hidnplayr | 406 | |
407 | ;----------------------------------------- |
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408 | ; Process TCP options if not in LISTEN state |
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409 | |||
410 | test [ebx + TCP_SOCKET.t_state], TCB_LISTEN |
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411 | jz .dont_do_options |
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412 | |||
413 | call TCP_do_options |
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414 | |||
415 | .dont_do_options: |
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416 | |||
417 | ;----------------------------------------------------------------------- |
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418 | ; Time to do some header prediction (Original Principle by Van Jacobson) |
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419 | |||
420 | |||
421 | ; There are two common cases for an uni-directional data transfer. |
||
422 | ; |
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423 | ; General rule: the packets has no control flags, is in-sequence, |
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424 | ; window width didnt change and we're not retransmitting. |
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425 | ; |
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426 | ; Second rules: |
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427 | ; - If the length is 0 and the ACK moved forward, we're the sender side of the transfer. |
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428 | ; In this case we'll free the ACK'ed data and notify higher levels that we have free space in buffer |
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429 | ; |
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430 | ; - If the length is not 0 and the ACK didn't move, we're the receiver side of the transfer. |
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431 | ; If the packets are in order (data queue is empty), add the data to the socket buffer and request a delayed ACK |
||
432 | |||
433 | cmp [TCP_SOCKET.t_state], TCB_ESTABLISHED |
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434 | jnz .not_uni_xfer |
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435 | |||
436 | test [TCP_segment.Flags], TH_SYN + TH_FIN + TH_RST + TH_URG |
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437 | jnz .not_uni_xfer |
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438 | |||
439 | test [TCP_segment.Flags], TH_ACK |
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440 | jz .not_uni_xfer |
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441 | |||
442 | mov eax, [edx + TCP_segment.SequenceNumber] |
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443 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
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444 | jne .not_uni_xfer |
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445 | |||
446 | movzx eax, [edx + TCP_segment.Window] ;;;;; |
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447 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
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448 | jne .not_uni_xfer |
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449 | |||
450 | mov eax, [ebx + TCP_SOCKET.SND_NXT] |
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451 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
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452 | jne .not_uni_xfer |
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453 | |||
454 | ;------------------------------------------------------------------------------- |
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455 | ; If last ACK falls within this segment's sequence number, record the timestamp. |
||
456 | |||
457 | ; TODO: check if it has a timestamp |
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458 | |||
459 | |||
460 | |||
461 | |||
462 | ;--------------------------------------- |
||
463 | ; check if we are sender in the uni-xfer |
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464 | |||
465 | ; If the following 4 conditions are all true, this segment is a pure ACK. |
||
466 | ; |
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467 | ; - The segment contains no data (ti_len is 0). |
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468 | |||
469 | movzx eax, [edx + TCP_segment.DataOffset] |
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1274 | hidnplayr | 470 | and eax, 11110000b |
471 | shr eax, 2 |
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472 | sub ecx, eax |
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1514 | hidnplayr | 473 | jnz .not_sender |
1274 | hidnplayr | 474 | |
1514 | hidnplayr | 475 | ; - The acknowledgment field in the segment (ti_ack) is greater than the largest unacknowledged sequence number (snd_una). |
476 | ; Since this test is "greater than" and not "greater than or equal to," it is true only if some positive amount of data is acknowledged by the ACK. |
||
1274 | hidnplayr | 477 | |
1514 | hidnplayr | 478 | mov eax, [edx + TCP_segment.AckNumber] |
479 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
480 | jle .not_uni_xfer |
||
1159 | hidnplayr | 481 | |
1514 | hidnplayr | 482 | ; - The acknowledgment field in the segment (ti_ack) is less than or equal to the maximum sequence number sent (snd_max). |
1159 | hidnplayr | 483 | |
1514 | hidnplayr | 484 | ; mov eax, [edx + TCP_segment.Ack] |
485 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
486 | jg .not_uni_xfer |
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1159 | hidnplayr | 487 | |
1514 | hidnplayr | 488 | ; - The congestion window (snd_cwnd) is greater than or equal to the current send window (snd_wnd). |
489 | ; 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. |
||
1254 | hidnplayr | 490 | |
1514 | hidnplayr | 491 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
492 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
493 | jl .not_uni_xfer |
||
1318 | hidnplayr | 494 | |
1514 | hidnplayr | 495 | DEBUGF 1,"Header prediction: we are sender\n" |
1274 | hidnplayr | 496 | |
1514 | hidnplayr | 497 | ;--------------------------------- |
498 | ; Packet is a pure ACK, process it |
||
1274 | hidnplayr | 499 | |
1514 | hidnplayr | 500 | ; Update RTT estimators |
1159 | hidnplayr | 501 | |
1514 | hidnplayr | 502 | ; Delete acknowledged bytes from send buffer |
1254 | hidnplayr | 503 | |
1514 | hidnplayr | 504 | ; Stop retransmit timer |
1519 | hidnplayr | 505 | mov [ebx + TCP_SOCKET.timer_ack], 0 |
1159 | hidnplayr | 506 | |
1514 | hidnplayr | 507 | ; Awaken waiting processes |
1519 | hidnplayr | 508 | mov eax, ebx |
509 | call SOCKET_notify_owner |
||
1318 | hidnplayr | 510 | |
1514 | hidnplayr | 511 | ; Generate more output |
1519 | hidnplayr | 512 | call TCP_output |
1254 | hidnplayr | 513 | |
1514 | hidnplayr | 514 | jmp .drop |
1159 | hidnplayr | 515 | |
1196 | hidnplayr | 516 | |
517 | |||
518 | |||
1514 | hidnplayr | 519 | ;------------------------------------------------- |
520 | ; maybe we are the receiver in the uni-xfer then.. |
||
521 | |||
522 | .not_sender: |
||
523 | ; The amount of data in the segment (ti_len) is greater than 0 (data count is in ecx) |
||
524 | |||
525 | |||
526 | ; The acknowledgment field (ti_ack) equals the largest unacknowledged sequence number. This means no data is acknowledged by this segment. |
||
527 | mov eax, [edx + TCP_segment.AckNumber] |
||
528 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
529 | jne .not_uni_xfer |
||
530 | |||
531 | ; The reassembly list of out-of-order segments for the connection is empty (seg_next equals tp). |
||
532 | ;;;; |
||
533 | jnz .not_uni_xfer |
||
534 | |||
535 | ; There is room in the receive buffer for the data in the segment. |
||
536 | ;;;; |
||
537 | jnz .not_uni_xfer |
||
538 | |||
539 | ;------------------------------------- |
||
540 | ; Complete processing of received data |
||
541 | |||
542 | DEBUGF 1,"header prediction: we are receiver\nreceiving %u bytes of data\n", ecx |
||
543 | |||
544 | ; The next expected receive sequence number (rcv_nxt) is incremented by the number of bytes of data. |
||
545 | |||
546 | add [ebx + TCP_SOCKET.RCV_NXT], ecx |
||
547 | |||
548 | ; Add the data to the socket buffer |
||
1519 | hidnplayr | 549 | mov eax, ebx |
550 | ;;; mov... |
||
551 | call SOCKET_input |
||
1514 | hidnplayr | 552 | |
553 | ; The delayed-ACK flag is set and the input processing is complete. |
||
554 | |||
555 | jmp .drop |
||
556 | |||
557 | |||
558 | |||
559 | |||
560 | |||
561 | ;---------------------------------------------------- |
||
562 | ; Header prediction failed, doing it the slow way.. |
||
563 | |||
564 | .not_uni_xfer: |
||
565 | |||
566 | DEBUGF 1,"Header prediction failed\n" |
||
567 | |||
568 | ;------------------------ |
||
569 | ; calculate header length ;;;;; we already calculated this before! |
||
570 | movzx eax, [edx + TCP_segment.DataOffset] |
||
571 | and eax, 0xf0 |
||
572 | shr eax, 2 |
||
573 | |||
574 | ; Update edx to point to data.. |
||
575 | add edx, eax |
||
576 | ; ..and ecx to give data size |
||
577 | sub ecx, eax |
||
578 | |||
579 | ;------------------------------ |
||
580 | ; Calculate receive window size |
||
581 | |||
582 | ;;;; |
||
583 | |||
584 | |||
585 | ;------------------------- |
||
586 | ; TCP slow input procedure |
||
587 | |||
588 | DEBUGF 1,"TCP slow input procedure\n" |
||
589 | |||
590 | cmp [eax + TCP_SOCKET.t_state], TCB_LISTEN |
||
591 | je .LISTEN |
||
592 | |||
593 | cmp [eax + TCP_SOCKET.t_state], TCB_SYN_SENT |
||
594 | je .SYN_SENT |
||
595 | |||
596 | |||
597 | ;-------------------------------------------- |
||
598 | ; Protection Against Wrapped Sequence Numbers |
||
599 | |||
600 | |||
601 | ; First, check timestamp if present |
||
602 | |||
603 | ;;;; TODO |
||
604 | |||
605 | ; Then, check if at least some bytes of data are within window |
||
606 | |||
607 | ;;;; TODO |
||
608 | |||
609 | jmp .trim_then_step6 |
||
610 | |||
1249 | hidnplayr | 611 | align 4 |
1514 | hidnplayr | 612 | .LISTEN: |
1196 | hidnplayr | 613 | |
1514 | hidnplayr | 614 | DEBUGF 1,"TCP state: listen\n" |
1159 | hidnplayr | 615 | |
1514 | hidnplayr | 616 | test [edx + TCP_segment.Flags], TH_RST |
617 | jnz .drop |
||
1159 | hidnplayr | 618 | |
1514 | hidnplayr | 619 | test [edx + TCP_segment.Flags], TH_ACK |
620 | jnz .drop_with_reset |
||
1159 | hidnplayr | 621 | |
1514 | hidnplayr | 622 | test [edx + TCP_segment.Flags], TH_SYN |
623 | jz .drop |
||
1159 | hidnplayr | 624 | |
1514 | hidnplayr | 625 | ; TODO: check if it's a broadcast or multicast, and drop if so |
1159 | hidnplayr | 626 | |
1514 | hidnplayr | 627 | ;;; 28.6 |
628 | |||
629 | ; create a new socket and fill in the nescessary variables |
||
630 | |||
631 | ;; Exit if backlog queue is full |
||
632 | ; mov ax, [ebx + TCP_SOCKET.backlog_cur] |
||
633 | ; cmp ax, [ebx + TCP_SOCKET.backlog] |
||
634 | ; jae .exit |
||
635 | |||
636 | ; Allocate new socket |
||
637 | call SOCKET_alloc |
||
638 | ;;; jz .fail |
||
639 | |||
640 | ; Copy structure from current socket to new, (including lock!) |
||
641 | ; We start at PID to reserve the socket num, and the 2 pointers at beginning of socket |
||
642 | lea esi, [edx + SOCKET.PID] |
||
643 | lea edi, [eax + SOCKET.PID] |
||
644 | mov ecx, (TCP_SOCKET.end - SOCKET.PID + 3)/4 |
||
1274 | hidnplayr | 645 | rep movsd |
1159 | hidnplayr | 646 | |
1514 | hidnplayr | 647 | ;; Push pointer to new socket to queue |
648 | ; movzx ecx, [ebx + TCP_SOCKET.backlog_cur] |
||
649 | ; inc [ebx + TCP_SOCKET.backlog_cur] |
||
650 | ; mov [ebx + TCP_SOCKET.end + ecx*4], eax |
||
1159 | hidnplayr | 651 | |
1514 | hidnplayr | 652 | mov [eax + IP_SOCKET.RemoteIP], esi ; IP source address |
1159 | hidnplayr | 653 | |
1514 | hidnplayr | 654 | mov cx, [edx + TCP_segment.SourcePort] |
655 | mov [eax + TCP_SOCKET.RemotePort], cx |
||
1159 | hidnplayr | 656 | |
1514 | hidnplayr | 657 | mov ecx, [edx + TCP_segment.SequenceNumber] |
658 | mov [eax + TCP_SOCKET.IRS], ecx |
||
1159 | hidnplayr | 659 | |
1514 | hidnplayr | 660 | mov ecx, [eax + TCP_SOCKET.ISS] |
661 | mov [eax + TCP_SOCKET.SND_NXT], ecx |
||
1159 | hidnplayr | 662 | |
1514 | hidnplayr | 663 | jmp .trim_then_step6 |
1159 | hidnplayr | 664 | |
1254 | hidnplayr | 665 | |
1159 | hidnplayr | 666 | |
1514 | hidnplayr | 667 | align 4 |
668 | .SYN_SENT: |
||
1281 | hidnplayr | 669 | |
1514 | hidnplayr | 670 | DEBUGF 1,"TCP state: syn_sent\n" |
1159 | hidnplayr | 671 | |
1514 | hidnplayr | 672 | test [edx + TCP_segment.Flags], TH_ACK |
673 | jz @f |
||
1281 | hidnplayr | 674 | |
1514 | hidnplayr | 675 | mov eax, [edx + TCP_segment.AckNumber] |
676 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
677 | jle .drop_with_reset |
||
1281 | hidnplayr | 678 | |
1514 | hidnplayr | 679 | mov eax, [edx + TCP_segment.AckNumber] |
680 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
681 | jg .drop_with_reset |
||
682 | @@: |
||
1281 | hidnplayr | 683 | |
684 | |||
1514 | hidnplayr | 685 | test [edx + TCP_segment.Flags], TH_RST |
686 | jz @f |
||
1281 | hidnplayr | 687 | |
1514 | hidnplayr | 688 | test [edx + TCP_segment.Flags], TH_ACK |
689 | jz .drop |
||
1281 | hidnplayr | 690 | |
1514 | hidnplayr | 691 | ;tp = tcp_drop(tp, ECONNREFUSED) |
1159 | hidnplayr | 692 | |
1514 | hidnplayr | 693 | jmp .drop |
694 | @@: |
||
1159 | hidnplayr | 695 | |
1514 | hidnplayr | 696 | test [edx + TCP_segment.Flags], TH_SYN |
697 | jz .drop |
||
1318 | hidnplayr | 698 | |
1514 | hidnplayr | 699 | ; now, process received SYN in response to an active open |
700 | test [edx + TCP_segment.Flags], TH_ACK |
||
701 | jz @f |
||
702 | |||
703 | mov eax, [edx + TCP_segment.AckNumber] |
||
704 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
705 | |||
706 | mov eax, [ebx + TCP_SOCKET.SND_UNA] |
||
707 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
708 | jle @f |
||
709 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
710 | |||
1519 | hidnplayr | 711 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval |
712 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 |
||
1514 | hidnplayr | 713 | |
714 | mov eax, [edx + TCP_segment.SequenceNumber] |
||
715 | mov [ebx + TCP_SOCKET.IRS], eax |
||
716 | |||
717 | ; TODO: set socket state to connected |
||
718 | |||
719 | mov [ebx + TCP_SOCKET.t_state], TCB_ESTABLISHED |
||
720 | |||
721 | ; TODO: check if we should scale the connection (567-572) |
||
722 | ; TODO: update RTT estimators |
||
723 | |||
724 | |||
725 | @@: |
||
726 | |||
727 | ; We have received a syn but no ACK, so we are having a simultaneous open.. |
||
728 | mov [ebx + TCP_SOCKET.t_state], TCB_SYN_RECEIVED |
||
729 | |||
730 | ;------------------------------------- |
||
731 | ; Common processing for receipt of SYN |
||
732 | |||
733 | .trimthenstep6: |
||
734 | |||
735 | inc [edx + TCP_segment.SequenceNumber] |
||
736 | |||
737 | cmp cx, [ebx + TCP_SOCKET.RCV_WND] |
||
738 | jle @f |
||
739 | |||
740 | movzx eax, cx |
||
741 | sub ax, [ebx + TCP_SOCKET.RCV_WND] |
||
742 | ; TODO: 592 |
||
743 | mov cx, [ebx + TCP_SOCKET.RCV_WND] |
||
744 | ; TODO... |
||
745 | @@: |
||
746 | ;;;;; |
||
747 | ;;; jmp .step6 |
||
748 | |||
749 | |||
750 | |||
751 | |||
752 | |||
1274 | hidnplayr | 753 | align 4 |
1514 | hidnplayr | 754 | .trim_then_step6: |
1159 | hidnplayr | 755 | |
1514 | hidnplayr | 756 | DEBUGF 1,"Trim, then step 6\n" |
1159 | hidnplayr | 757 | |
1514 | hidnplayr | 758 | ;---------------------------- |
759 | ; trim any data not in window |
||
1159 | hidnplayr | 760 | |
1514 | hidnplayr | 761 | mov eax, [ebx + TCP_SOCKET.RCV_NXT] |
762 | sub eax, [edx + TCP_segment.SequenceNumber] |
||
1318 | hidnplayr | 763 | |
1514 | hidnplayr | 764 | test eax, eax |
765 | jz .no_drop |
||
1274 | hidnplayr | 766 | |
1514 | hidnplayr | 767 | test [edx + TCP_segment.Flags], TH_SYN |
768 | jz .no_drop |
||
769 | |||
770 | and [edx + TCP_segment.Flags], not (TH_SYN) |
||
771 | inc [edx + TCP_segment.SequenceNumber] |
||
772 | |||
773 | cmp [edx + TCP_segment.UrgentPointer], 1 |
||
774 | jl @f |
||
775 | |||
776 | dec [edx + TCP_segment.UrgentPointer] |
||
777 | |||
778 | jmp .no_drop |
||
779 | @@: |
||
780 | |||
781 | and [edx + TCP_segment.Flags], not (TH_URG) |
||
782 | dec eax |
||
783 | |||
784 | .no_drop: |
||
785 | |||
786 | ; eax holds number of bytes to drop |
||
787 | |||
788 | |||
789 | ;---------------------------------- |
||
790 | ; Check for entire duplicate packet |
||
791 | |||
792 | cmp eax, ecx |
||
793 | jge .duplicate |
||
794 | |||
795 | ;;; TODO: figure 28.30 |
||
796 | |||
797 | ;; inc [TCP_segments_rx] |
||
798 | |||
799 | ;; add dword [TCP_bytes_rx], ecx |
||
800 | ;; adc dword [TCP_bytes_rx+4], 0 |
||
801 | |||
802 | ;------------------------ |
||
803 | ; Check for duplicate FIN |
||
804 | |||
805 | test [edx + TCP_segment.Flags], TH_FIN |
||
806 | jz @f |
||
807 | inc ecx |
||
808 | cmp eax, ecx |
||
809 | dec ecx |
||
810 | jne @f |
||
811 | |||
812 | mov eax, ecx |
||
813 | and [edx + TCP_segment.Flags], not TH_FIN |
||
814 | ;;; TODO: set ACKNOW flag |
||
815 | |||
816 | jmp .no_duplicate |
||
817 | @@: |
||
818 | |||
819 | ; Handle the case when a bound socket connects to itself |
||
820 | ; Allow packets with a SYN and an ACKto continue with the processing |
||
821 | |||
822 | |||
823 | ;------------------------------------- |
||
824 | ; Generate duplicate ACK if nescessary |
||
825 | |||
826 | ; This code also handles simultaneous half-open or self-connects |
||
827 | |||
828 | test eax, eax |
||
829 | jnz .drop_after_ack |
||
830 | |||
831 | cmp [edx + TCP_segment.Flags], TH_ACK |
||
832 | jz .drop_after_ack |
||
833 | |||
834 | .duplicate: |
||
835 | |||
836 | ;---------------------------------------- |
||
837 | ; Update statistics for duplicate packets |
||
838 | |||
839 | ;;; TODO |
||
840 | |||
841 | ;;; DROP the packet ?? |
||
842 | |||
843 | .no_duplicate: |
||
844 | |||
845 | ;----------------------------------------------- |
||
846 | ; Remove duplicate data and update urgent offset |
||
847 | |||
848 | add [edx + TCP_segment.SequenceNumber], eax |
||
849 | |||
850 | ;;; TODO |
||
851 | |||
852 | sub [edx + TCP_segment.UrgentPointer], ax |
||
853 | jg @f |
||
854 | |||
855 | and [edx + TCP_segment.Flags], not (TH_URG) |
||
856 | mov [edx + TCP_segment.UrgentPointer], 0 |
||
857 | @@: |
||
858 | |||
859 | ;-------------------------------------------------- |
||
860 | ; Handle data that arrives after process terminates |
||
861 | |||
862 | cmp [ebx + SOCKET.PID], 0 |
||
863 | jge @f |
||
864 | |||
865 | cmp [ebx + TCP_SOCKET.t_state], TCB_CLOSE_WAIT |
||
866 | jle @f |
||
867 | |||
868 | test ecx, ecx |
||
869 | jz @f |
||
870 | |||
871 | ;;; Close the socket |
||
872 | ;;; update stats |
||
873 | |||
874 | jmp .drop_with_reset |
||
875 | |||
876 | @@: |
||
877 | |||
878 | ;---------------------------------------- |
||
879 | ; Remove data beyond right edge of window |
||
880 | |||
881 | mov eax, [edx + TCP_segment.SequenceNumber] |
||
882 | add eax, ecx |
||
883 | sub eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
884 | sub ax, [ebx + TCP_SOCKET.RCV_WND] |
||
885 | |||
886 | ; eax now holds the number of bytes to drop |
||
887 | |||
888 | jle .no_excess_data |
||
889 | |||
890 | ;;; TODO: update stats |
||
891 | |||
892 | cmp eax, ecx |
||
893 | jl .dont_drop_all |
||
894 | |||
895 | ;;; TODO 700-736 |
||
896 | |||
897 | .dont_drop_all: |
||
898 | |||
899 | .no_excess_data: |
||
900 | |||
901 | |||
902 | ;----------------- |
||
903 | ; Record timestamp |
||
904 | |||
905 | ;;; TODO 737-746 |
||
906 | |||
907 | ;------------------ |
||
908 | ; Process RST flags |
||
909 | |||
910 | test [edx + TCP_segment.Flags], TH_RST |
||
911 | jz .rst_skip |
||
912 | |||
913 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
914 | shl eax, 2 |
||
915 | jmp dword [eax + .rst_sw_list] |
||
916 | |||
917 | .rst_sw_list: |
||
918 | dd .rst_skip ;TCB_CLOSED |
||
919 | dd .rst_skip ;TCB_LISTEN |
||
920 | dd .rst_skip ;TCB_SYN_SENT |
||
921 | dd .econnrefused ;TCB_SYN_RECEIVED |
||
922 | dd .econnreset ;TCB_ESTABLISHED |
||
923 | dd .econnreset ;TCB_CLOSE_WAIT |
||
924 | dd .econnreset ;TCB_FIN_WAIT_1 |
||
925 | dd .rst_close ;TCB_CLOSING |
||
926 | dd .rst_close ;TCB_LAST_ACK |
||
927 | dd .econnreset ;TCB_FIN_WAIT_2 |
||
928 | dd .rst_close ;TCB_TIMED_WAIT |
||
929 | |||
930 | .econnrefused: |
||
931 | |||
932 | ;;; TODO: debug info |
||
933 | |||
934 | jmp .close |
||
935 | |||
936 | .econnreset: |
||
937 | |||
938 | ;;; TODO: debug info |
||
939 | .close: |
||
940 | |||
941 | ;;; update stats |
||
942 | |||
943 | .rst_close: |
||
944 | |||
945 | ;;; Close the socket |
||
946 | jmp .drop |
||
947 | |||
948 | .rst_skip: |
||
949 | |||
950 | ;-------------------------------------- |
||
951 | ; handle SYN-full and ACK-less segments |
||
952 | |||
953 | test [edx + TCP_segment.Flags], TH_SYN |
||
954 | jz @f |
||
955 | |||
956 | ;;; tcp_drop ( ECONNRESET) |
||
957 | jmp .drop_with_reset |
||
958 | |||
959 | test [edx + TCP_segment.Flags], TH_ACK |
||
960 | jz .drop |
||
961 | |||
962 | ;---------------- |
||
963 | ; Process the ACK |
||
964 | |||
965 | cmp [ebx + TCP_SOCKET.t_state], TCB_SYN_RECEIVED |
||
966 | jg .ack_dup |
||
967 | jl .ack_nodup |
||
968 | |||
969 | ;;;;; |
||
970 | |||
971 | .ack_dup: |
||
972 | |||
973 | ;;;; |
||
974 | |||
975 | .ack_nodup: |
||
976 | |||
977 | ;;;; 887 |
||
978 | |||
979 | ;------------------------------------------------- |
||
1519 | hidnplayr | 980 | ; If the congestion window was inflated to account |
1514 | hidnplayr | 981 | ; for the other side's cached packets, retrace it |
982 | |||
983 | ;;;; 888 - 902 |
||
984 | |||
985 | |||
986 | ;------------------------------------------ |
||
987 | ; RTT measurements and retransmission timer |
||
988 | |||
989 | ;;;;; 903 - 926 |
||
990 | |||
1519 | hidnplayr | 991 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 |
1514 | hidnplayr | 992 | |
1519 | hidnplayr | 993 | mov eax, [ebx + TCP_SOCKET.SND_MAX] |
994 | cmp eax, [edx + TCP_segment.AckNumber] |
||
995 | je .all_outstanding |
||
996 | mov [ebx + TCP_SOCKET.timer_retransmission], 120 ;;;; TODO: correct this value |
||
997 | .all_outstanding: |
||
998 | |||
999 | |||
1514 | hidnplayr | 1000 | ;------------------------------------------- |
1001 | ; Open congestion window in response to ACKs |
||
1002 | |||
1003 | ;;;; |
||
1004 | |||
1005 | |||
1006 | ;------------------------------------------ |
||
1007 | ; Remove acknowledged data from send buffer |
||
1008 | |||
1009 | ;;;; 943 - 956 |
||
1010 | |||
1011 | ;--------------------------------------- |
||
1012 | ; Wake up process waiting on send buffer |
||
1013 | |||
1014 | ;;;;; |
||
1015 | |||
1016 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
1017 | shl eax, 2 |
||
1018 | jmp dword [eax + .ACK_sw_list] |
||
1019 | |||
1020 | .ACK_sw_list: |
||
1021 | dd .step6 ;TCB_CLOSED |
||
1022 | dd .step6 ;TCB_LISTEN |
||
1023 | dd .step6 ;TCB_SYN_SENT |
||
1024 | dd .step6 ;TCB_SYN_RECEIVED |
||
1025 | dd .step6 ;TCB_ESTABLISHED |
||
1026 | dd .step6 ;TCB_CLOSE_WAIT |
||
1027 | dd ._963 ;TCB_FIN_WAIT_1 |
||
1028 | dd ._958 ;TCB_CLOSING |
||
1029 | dd ._999 ;TCB_LAST_ACK |
||
1030 | dd .step6 ;TCB_FIN_WAIT_2 |
||
1031 | dd ._1010 ;TCB_TIMED_WAIT |
||
1032 | |||
1033 | |||
1034 | ._963: |
||
1035 | |||
1036 | |||
1037 | jmp .step6 |
||
1038 | |||
1039 | |||
1040 | ._958: |
||
1041 | |||
1042 | jmp .step6 |
||
1043 | |||
1044 | ._999: |
||
1045 | |||
1046 | jmp .step6 |
||
1047 | |||
1048 | |||
1049 | ._1010: |
||
1050 | |||
1051 | jmp .step6 |
||
1052 | |||
1053 | |||
1054 | |||
1055 | align 4 |
||
1056 | .step6: |
||
1057 | |||
1058 | DEBUGF 1,"step 6\n" |
||
1059 | |||
1060 | ;-------------------------- |
||
1061 | ; update window information |
||
1062 | |||
1063 | test [edx + TCP_segment.Flags], TH_ACK |
||
1064 | jz .no_window_update |
||
1065 | |||
1066 | mov eax, [ebx + TCP_SOCKET.SND_WL1] |
||
1067 | cmp eax, [edx + TCP_segment.SequenceNumber] |
||
1068 | |||
1069 | ;;;; 1021 |
||
1070 | |||
1071 | ;---------------------------------- |
||
1072 | ; Keep track of pure window updates |
||
1073 | |||
1074 | test ecx, ecx |
||
1075 | jz @f |
||
1076 | |||
1077 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
||
1078 | cmp eax, [edx + TCP_segment.AckNumber] |
||
1079 | jne @f |
||
1080 | |||
1081 | ;; mov eax, tiwin |
||
1082 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
1083 | jle @f |
||
1084 | |||
1085 | ;;; update stats |
||
1086 | |||
1087 | @@: |
||
1088 | |||
1089 | ;; mov eax, incoming window |
||
1090 | cmp eax, [ebx + TCP_SOCKET.max_sndwnd] |
||
1091 | jle @f |
||
1092 | mov [ebx + TCP_SOCKET.max_sndwnd], eax |
||
1093 | @@: |
||
1094 | mov [ebx + TCP_SOCKET.SND_WND], eax |
||
1095 | |||
1096 | mov eax, [edx + TCP_segment.SequenceNumber] |
||
1097 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
1098 | |||
1099 | mov eax, [edx + TCP_segment.AckNumber] |
||
1100 | mov [ebx + TCP_SOCKET.SND_WL2], eax |
||
1101 | |||
1102 | ;;; needoutput = 1 |
||
1103 | |||
1104 | .no_window_update: |
||
1105 | |||
1106 | |||
1107 | ;----------------- |
||
1108 | ; process URG flag |
||
1109 | |||
1110 | test [edx + TCP_segment.Flags], TH_URG |
||
1111 | jz .not_urgent |
||
1112 | |||
1113 | cmp [edx + TCP_segment.UrgentPointer], 0 |
||
1114 | jz .not_urgent |
||
1115 | |||
1116 | cmp [ebx + TCP_SOCKET.t_state], TCB_TIMED_WAIT |
||
1117 | je .not_urgent |
||
1118 | |||
1119 | ; Ignore bogus urgent offsets |
||
1120 | |||
1121 | ;;; 1040-1050 |
||
1122 | |||
1123 | movzx eax, [edx + TCP_segment.UrgentPointer] |
||
1124 | add eax, [ebx + SOCKET.SO_RCV.SB_CC] |
||
1125 | cmp eax, SOCKET_MAXDATA |
||
1126 | jle .not_urgent |
||
1127 | |||
1128 | mov [edx + TCP_segment.UrgentPointer], 0 |
||
1129 | and [edx + TCP_segment.Flags], not (TH_URG) |
||
1130 | jmp .do_data |
||
1131 | |||
1132 | .not_urgent: |
||
1133 | |||
1134 | ;-------------------------------------- |
||
1135 | ; processing of received urgent pointer |
||
1136 | |||
1137 | ;;; 1051-1093 |
||
1138 | |||
1139 | align 4 |
||
1140 | .do_data: |
||
1141 | |||
1142 | DEBUGF 1,"Do data:\n" |
||
1143 | |||
1144 | ; process the data in the segment |
||
1145 | |||
1146 | test [edx + TCP_segment.Flags], TH_FIN |
||
1147 | jz .process_fin |
||
1148 | |||
1149 | test [ebx + TCP_SOCKET.t_state], TCB_FIN_WAIT_1 ;;;;; |
||
1150 | jge .dont_do_data |
||
1151 | |||
1152 | DEBUGF 1,"Processing data in segment\n" |
||
1153 | |||
1154 | ;;; NOW, process the data |
||
1155 | |||
1156 | jmp .final_processing |
||
1157 | |||
1158 | |||
1159 | .dont_do_data: |
||
1160 | |||
1161 | |||
1162 | ;--------------- |
||
1163 | ; FIN processing |
||
1164 | |||
1165 | .process_fin: |
||
1166 | |||
1167 | DEBUGF 1,"Processing FIN\n" |
||
1168 | |||
1169 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
1170 | shl eax, 2 |
||
1171 | jmp dword [eax + .FIN_sw_list] |
||
1172 | |||
1173 | .FIN_sw_list: |
||
1174 | dd .no_fin ;TCB_CLOSED |
||
1175 | dd .no_fin ;TCB_LISTEN |
||
1176 | dd .no_fin ;TCB_SYN_SENT |
||
1177 | dd ._1131 ;TCB_SYN_RECEIVED |
||
1178 | dd ._1131 ;TCB_ESTABLISHED |
||
1179 | dd .no_fin ;TCB_CLOSE_WAIT |
||
1180 | dd ._1139 ;TCB_FIN_WAIT_1 |
||
1181 | dd .no_fin ;TCB_CLOSING |
||
1182 | dd .no_fin ;TCB_LAST_ACK |
||
1183 | dd ._1147 ;TCB_FIN_WAIT_2 |
||
1184 | dd ._1156 ;TCB_TIMED_WAIT |
||
1185 | |||
1186 | |||
1187 | |||
1188 | ._1131: |
||
1189 | |||
1190 | ._1139: |
||
1191 | |||
1192 | ._1147: |
||
1193 | |||
1194 | ._1156: |
||
1195 | |||
1196 | |||
1197 | .no_fin: |
||
1198 | |||
1199 | ;----------------- |
||
1200 | ; Final processing |
||
1201 | |||
1202 | .final_processing: |
||
1203 | |||
1204 | DEBUGF 1,"Final processing\n" |
||
1205 | |||
1206 | ;;; if debug enabled, output packet |
||
1207 | |||
1208 | ;test ;;;needoutput = 1 |
||
1209 | ;jnz .outputnow |
||
1210 | |||
1211 | test [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1212 | jz .ret |
||
1213 | |||
1214 | .outputnow: |
||
1215 | call TCP_output |
||
1216 | |||
1217 | .ret: |
||
1218 | mov [ebx + SOCKET.lock], 0 |
||
1219 | |||
1274 | hidnplayr | 1220 | call kernel_free |
1514 | hidnplayr | 1221 | ret 4 |
1274 | hidnplayr | 1222 | |
1514 | hidnplayr | 1223 | ;------------------------------------------ |
1224 | ; Generate an ACK, droping incoming segment |
||
1274 | hidnplayr | 1225 | |
1514 | hidnplayr | 1226 | align 4 |
1227 | .drop_after_ack: |
||
1274 | hidnplayr | 1228 | |
1514 | hidnplayr | 1229 | DEBUGF 1,"Drop after ACK\n" |
1274 | hidnplayr | 1230 | |
1514 | hidnplayr | 1231 | test [edx + TCP_segment.Flags], TH_RST |
1232 | jnz .drop |
||
1274 | hidnplayr | 1233 | |
1514 | hidnplayr | 1234 | and [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1274 | hidnplayr | 1235 | |
1514 | hidnplayr | 1236 | call TCP_output |
1318 | hidnplayr | 1237 | |
1514 | hidnplayr | 1238 | mov [ebx + SOCKET.lock], 0 |
1274 | hidnplayr | 1239 | |
1514 | hidnplayr | 1240 | call kernel_free |
1241 | ret 4 |
||
1274 | hidnplayr | 1242 | |
1514 | hidnplayr | 1243 | |
1244 | ;------------------------------------------- |
||
1245 | ; Generate an RST, dropping incoming segment |
||
1246 | |||
1247 | align 4 |
||
1248 | .drop_with_reset: |
||
1249 | |||
1250 | DEBUGF 1,"Drop with reset\n" |
||
1251 | |||
1252 | test [edx + TCP_segment.Flags], TH_RST |
||
1253 | jnz .drop |
||
1254 | |||
1255 | ;;; if its a multicast/broadcast, also drop |
||
1256 | |||
1257 | test [edx + TCP_segment.Flags], TH_ACK |
||
1258 | jnz .respond_ack |
||
1259 | |||
1260 | test [edx + TCP_segment.Flags], TH_SYN |
||
1261 | jnz .respond_syn |
||
1262 | |||
1263 | mov [ebx + SOCKET.lock], 0 |
||
1264 | |||
1265 | call kernel_free |
||
1266 | ret 4 |
||
1267 | |||
1268 | .respond_ack: |
||
1269 | |||
1270 | ;;;; |
||
1271 | |||
1272 | call TCP_respond |
||
1273 | |||
1274 | jmp .destroy_new_socket |
||
1275 | |||
1276 | |||
1277 | .respond_syn: |
||
1278 | |||
1279 | ;;;; |
||
1280 | |||
1281 | call TCP_respond |
||
1282 | |||
1283 | jmp .destroy_new_socket |
||
1284 | |||
1285 | ;----- |
||
1286 | ; Drop |
||
1287 | |||
1288 | align 4 |
||
1289 | .drop: |
||
1290 | |||
1291 | DEBUGF 1,"Dropping packet\n" |
||
1292 | |||
1293 | ;;;; If debugging options are enabled, output the packet somwhere |
||
1294 | |||
1295 | .destroy_new_socket: |
||
1296 | |||
1297 | ;;;; kill the newly created socket |
||
1298 | |||
1299 | mov [ebx + SOCKET.lock], 0 |
||
1300 | |||
1301 | call kernel_free |
||
1302 | ret 4 |
||
1303 | |||
1304 | |||
1305 | |||
1306 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
||
1307 | |||
1308 | |||
1309 | |||
1310 | ;--------------------- |
||
1318 | hidnplayr | 1311 | ; |
1514 | hidnplayr | 1312 | ; TCP_do_options |
1318 | hidnplayr | 1313 | ; |
1514 | hidnplayr | 1314 | ;------------------- |
1315 | |||
1318 | hidnplayr | 1316 | align 4 |
1514 | hidnplayr | 1317 | TCP_do_options: |
1274 | hidnplayr | 1318 | |
1514 | hidnplayr | 1319 | DEBUGF 1,"TCP_do_options\n" |
1274 | hidnplayr | 1320 | |
1514 | hidnplayr | 1321 | push eax |
1322 | sub eax, 20 |
||
1323 | jz .no_options |
||
1274 | hidnplayr | 1324 | |
1514 | hidnplayr | 1325 | lea esi, [edx + TCP_segment.Data] |
1318 | hidnplayr | 1326 | |
1514 | hidnplayr | 1327 | |
1328 | ;------------------------------------------- |
||
1329 | ; Begin the loop by checking for EOL and NOP |
||
1330 | |||
1318 | hidnplayr | 1331 | .loop: |
1332 | |||
1514 | hidnplayr | 1333 | cmp byte [esi], TCP_OPT_EOL ; end of option list? |
1334 | jz .no_options |
||
1318 | hidnplayr | 1335 | |
1514 | hidnplayr | 1336 | cmp byte [esi], TCP_OPT_NOP ; nop ? |
1337 | ;;; cmove edi, 1 ; if so, set option size to 1 |
||
1338 | jz .continue ; and continue scanning |
||
1318 | hidnplayr | 1339 | |
1514 | hidnplayr | 1340 | ;------------------ |
1341 | ; We have an option |
||
1318 | hidnplayr | 1342 | |
1514 | hidnplayr | 1343 | movzx edi, byte [esi + 1] ; get the length of this option in edi |
1318 | hidnplayr | 1344 | |
1345 | |||
1514 | hidnplayr | 1346 | ;-------------------------------------- |
1347 | ; Check for Maximum segment size option |
||
1318 | hidnplayr | 1348 | |
1514 | hidnplayr | 1349 | cmp byte [esi], TCP_OPT_MAXSEG |
1350 | jne .no_maxseg |
||
1318 | hidnplayr | 1351 | |
1514 | hidnplayr | 1352 | cmp edi, 4 ; option length |
1353 | jne .continue |
||
1318 | hidnplayr | 1354 | |
1514 | hidnplayr | 1355 | test [edx + TCP_segment.Flags], TH_SYN |
1356 | jz .continue |
||
1318 | hidnplayr | 1357 | |
1514 | hidnplayr | 1358 | ; Now parse the option... |
1318 | hidnplayr | 1359 | |
1514 | hidnplayr | 1360 | jmp .continue |
1318 | hidnplayr | 1361 | |
1514 | hidnplayr | 1362 | .no_maxseg: |
1318 | hidnplayr | 1363 | |
1514 | hidnplayr | 1364 | ;------------------------ |
1365 | ; Check for Window option |
||
1318 | hidnplayr | 1366 | |
1514 | hidnplayr | 1367 | cmp byte [esi], TCP_OPT_WINDOW |
1368 | jne .no_window |
||
1318 | hidnplayr | 1369 | |
1514 | hidnplayr | 1370 | cmp edi, 3 ; option length |
1371 | jne .continue |
||
1318 | hidnplayr | 1372 | |
1514 | hidnplayr | 1373 | test [edx + TCP_segment.Flags], TH_SYN |
1374 | jz .continue |
||
1318 | hidnplayr | 1375 | |
1514 | hidnplayr | 1376 | ; ... |
1318 | hidnplayr | 1377 | |
1514 | hidnplayr | 1378 | jmp .continue |
1318 | hidnplayr | 1379 | |
1514 | hidnplayr | 1380 | .no_window: |
1318 | hidnplayr | 1381 | |
1514 | hidnplayr | 1382 | ;--------------------------- |
1383 | ; Check for Timestamp option |
||
1318 | hidnplayr | 1384 | |
1514 | hidnplayr | 1385 | cmp byte [esi], TCP_OPT_TIMESTAMP |
1386 | jne .no_timestamp |
||
1318 | hidnplayr | 1387 | |
1514 | hidnplayr | 1388 | cmp edi, 10 ; option length |
1389 | jne .continue |
||
1318 | hidnplayr | 1390 | |
1514 | hidnplayr | 1391 | ; ... |
1392 | |||
1393 | |||
1394 | jmp .continue |
||
1395 | |||
1396 | .no_timestamp: |
||
1397 | |||
1398 | ;---------------------------------- |
||
1399 | ; Future options may be placed here |
||
1400 | |||
1401 | |||
1402 | |||
1403 | |||
1404 | ;------------------------------ |
||
1405 | ; Continue scanning for options |
||
1406 | |||
1407 | .continue: |
||
1408 | add esi, edi |
||
1409 | sub eax, edi |
||
1410 | jg .loop |
||
1411 | |||
1412 | .no_options: |
||
1413 | |||
1318 | hidnplayr | 1414 | pop eax |
1514 | hidnplayr | 1415 | |
1318 | hidnplayr | 1416 | ret |
1417 | |||
1514 | hidnplayr | 1418 | |
1419 | |||
1420 | |||
1421 | ;--------------------------- |
||
1422 | ; |
||
1423 | ; TCP_pull_out_of_band |
||
1424 | ; |
||
1425 | ; IN: eax = |
||
1426 | ; ebx = socket ptr |
||
1427 | ; edx = tcp packet ptr |
||
1428 | ; |
||
1429 | ; OUT: / |
||
1430 | ; |
||
1431 | ;--------------------------- |
||
1432 | |||
1433 | align 4 |
||
1434 | TCP_pull_out_of_band: |
||
1435 | |||
1436 | DEBUGF 1,"TCP_pull_out_of_band\n" |
||
1437 | |||
1438 | ;;;; 1282-1305 |
||
1439 | |||
1318 | hidnplayr | 1440 | ret |
1441 | |||
1442 | |||
1443 | |||
1444 | |||
1514 | hidnplayr | 1445 | |
1446 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
||
1447 | |||
1448 | |||
1449 | |||
1450 | |||
1451 | |||
1318 | hidnplayr | 1452 | ;----------------------------------------------------------------- |
1453 | ; |
||
1514 | hidnplayr | 1454 | ; TCP_output |
1318 | hidnplayr | 1455 | ; |
1519 | hidnplayr | 1456 | ; IN: eax = socket pointer |
1514 | hidnplayr | 1457 | ;; esi = ptr to data |
1458 | ;; ecx = number of data bytes |
||
1459 | ; |
||
1318 | hidnplayr | 1460 | ; OUT: / |
1461 | ; |
||
1462 | ;----------------------------------------------------------------- |
||
1463 | align 4 |
||
1514 | hidnplayr | 1464 | TCP_output: |
1318 | hidnplayr | 1465 | |
1514 | hidnplayr | 1466 | DEBUGF 1,"TCP_output, socket: %x\n", eax |
1318 | hidnplayr | 1467 | |
1514 | hidnplayr | 1468 | ; We'll detect the length of the data to be transmitted, and flags to be used |
1469 | ; If there is some data, or any critical controls to send (SYN / RST), then transmit |
||
1470 | ; Otherwise, investigate further |
||
1318 | hidnplayr | 1471 | |
1514 | hidnplayr | 1472 | mov ebx, [eax + TCP_SOCKET.SND_MAX] |
1473 | cmp ebx, [eax + TCP_SOCKET.SND_UNA] |
||
1474 | jne .not_idle |
||
1318 | hidnplayr | 1475 | |
1514 | hidnplayr | 1476 | mov ebx, [eax + TCP_SOCKET.t_idle] |
1477 | cmp ebx, [eax + TCP_SOCKET.t_rxtcur] |
||
1478 | jle .not_idle |
||
1318 | hidnplayr | 1479 | |
1514 | hidnplayr | 1480 | ; We have been idle for a while and no ACKS are expected to clock out any data we send.. |
1481 | ; Slow start to get ack "clock" running again. |
||
1318 | hidnplayr | 1482 | |
1514 | hidnplayr | 1483 | mov ebx, [eax + TCP_SOCKET.t_maxseg] |
1484 | mov [eax + TCP_SOCKET.SND_CWND], ebx |
||
1318 | hidnplayr | 1485 | |
1514 | hidnplayr | 1486 | .not_idle: |
1487 | .again: |
||
1488 | mov ebx, [eax + TCP_SOCKET.SND_NXT] ; calculate offset |
||
1489 | sub ebx, [eax + TCP_SOCKET.SND_UNA] ; |
||
1318 | hidnplayr | 1490 | |
1514 | hidnplayr | 1491 | mov ecx, [eax + TCP_SOCKET.SND_WND] ; determine window |
1492 | cmp ecx, [eax + TCP_SOCKET.SND_CWND] ; |
||
1493 | jl @f ; |
||
1494 | mov ecx, [eax + TCP_SOCKET.SND_CWND] ; |
||
1495 | @@: ; |
||
1318 | hidnplayr | 1496 | |
1514 | hidnplayr | 1497 | call TCP_outflags |
1318 | hidnplayr | 1498 | |
1514 | hidnplayr | 1499 | ; If in persist timeout with window of 0, send 1 byte. |
1500 | ; Otherwise, if window is small but nonzero, and timer expired, |
||
1501 | ; we will send what we can and go to transmit state |
||
1318 | hidnplayr | 1502 | |
1514 | hidnplayr | 1503 | test [eax + TCP_SOCKET.t_force], -1 |
1504 | jz .no_persist_timeout |
||
1318 | hidnplayr | 1505 | |
1514 | hidnplayr | 1506 | test ecx, ecx |
1507 | jnz .no_zero_window |
||
1255 | hidnplayr | 1508 | |
1514 | hidnplayr | 1509 | cmp ebx, [eax + SOCKET.SO_SND.SB_CC] |
1510 | jge @f |
||
1255 | hidnplayr | 1511 | |
1514 | hidnplayr | 1512 | and dl, not (TH_FIN) ; clear the FIN flag ??? how can it be set before? |
1255 | hidnplayr | 1513 | |
1514 | hidnplayr | 1514 | @@: |
1515 | inc ecx |
||
1516 | jmp .no_persist_timeout |
||
1255 | hidnplayr | 1517 | |
1514 | hidnplayr | 1518 | .no_zero_window: |
1254 | hidnplayr | 1519 | |
1514 | hidnplayr | 1520 | ;;; mov [eax + TCP_SOCKET.t_timer....TCPT_PERSIST], 0 |
1521 | mov [eax + TCP_SOCKET.t_rxtshift], 0 |
||
1254 | hidnplayr | 1522 | |
1514 | hidnplayr | 1523 | .no_persist_timeout: |
1159 | hidnplayr | 1524 | |
1514 | hidnplayr | 1525 | ;;;106 |
1159 | hidnplayr | 1526 | |
1514 | hidnplayr | 1527 | mov esi, [eax + SOCKET.SO_SND.SB_CC] |
1528 | cmp esi, ecx |
||
1529 | jl @f |
||
1530 | mov esi, ecx |
||
1531 | @@: |
||
1532 | sub esi, ebx |
||
1254 | hidnplayr | 1533 | |
1514 | hidnplayr | 1534 | cmp esi, -1 |
1535 | jne .not_minus_one |
||
1159 | hidnplayr | 1536 | |
1514 | hidnplayr | 1537 | ; If FIN has been set, but not ACKed, and we havent been called to retransmit, |
1538 | ; len (esi) will be -1 |
||
1539 | ; Otherwise, window shrank after we sent into it. |
||
1540 | ; If window shrank to 0, cancel pending retransmit and pull SND_NXT back to (closed) window |
||
1541 | ; We will enter persist state below. |
||
1542 | ; If window didn't close completely, just wait for an ACK |
||
1159 | hidnplayr | 1543 | |
1514 | hidnplayr | 1544 | xor esi, esi |
1159 | hidnplayr | 1545 | |
1514 | hidnplayr | 1546 | test ecx, ecx |
1547 | jnz @f |
||
1159 | hidnplayr | 1548 | |
1514 | hidnplayr | 1549 | ;;; mov [eax + TCP_SOCKET.t_timer..TCPT_REXMT], 0 |
1274 | hidnplayr | 1550 | |
1514 | hidnplayr | 1551 | push [eax + TCP_SOCKET.SND_UNA] |
1552 | pop [eax + TCP_SOCKET.SND_NXT] |
||
1553 | @@: |
||
1254 | hidnplayr | 1554 | |
1514 | hidnplayr | 1555 | .not_minus_one: |
1254 | hidnplayr | 1556 | |
1514 | hidnplayr | 1557 | ;;; 124 |
1159 | hidnplayr | 1558 | |
1514 | hidnplayr | 1559 | cmp esi, [eax + TCP_SOCKET.t_maxseg] |
1560 | jle @f |
||
1274 | hidnplayr | 1561 | |
1514 | hidnplayr | 1562 | mov esi, [eax + TCP_SOCKET.t_maxseg] |
1563 | ;sendalot = 1 |
||
1274 | hidnplayr | 1564 | |
1514 | hidnplayr | 1565 | @@: |
1274 | hidnplayr | 1566 | |
1514 | hidnplayr | 1567 | ;;; 128 |
1274 | hidnplayr | 1568 | |
1514 | hidnplayr | 1569 | mov edi, [eax + TCP_SOCKET.SND_NXT] |
1570 | add edi, esi ; len |
||
1571 | sub edi, [eax + TCP_SOCKET.SND_UNA] |
||
1572 | add edi, [eax + SOCKET.SO_SND.SB_CC] |
||
1573 | cmp edi, 0 |
||
1574 | jle @f |
||
1274 | hidnplayr | 1575 | |
1514 | hidnplayr | 1576 | and dl, not (TH_FIN) ; clear the FIN flag |
1159 | hidnplayr | 1577 | |
1514 | hidnplayr | 1578 | @@: |
1159 | hidnplayr | 1579 | |
1580 | |||
1514 | hidnplayr | 1581 | ;;;; 130 TODO: set window (ecx) to space in send buffer |
1159 | hidnplayr | 1582 | |
1583 | |||
1514 | hidnplayr | 1584 | ;------------------------------ |
1585 | ; Sender silly window avoidance |
||
1159 | hidnplayr | 1586 | |
1514 | hidnplayr | 1587 | test esi, esi |
1588 | jz .zero_length |
||
1159 | hidnplayr | 1589 | |
1249 | hidnplayr | 1590 | |
1514 | hidnplayr | 1591 | cmp esi, [eax + TCP_SOCKET.t_maxseg] |
1592 | je .send |
||
1274 | hidnplayr | 1593 | |
1514 | hidnplayr | 1594 | ;;; TODO: 144-145 |
1274 | hidnplayr | 1595 | |
1514 | hidnplayr | 1596 | test [eax + TCP_SOCKET.t_force], -1 |
1597 | jnz .send |
||
1274 | hidnplayr | 1598 | |
1514 | hidnplayr | 1599 | ;;; TODO: 149..152 |
1274 | hidnplayr | 1600 | |
1514 | hidnplayr | 1601 | .zero_length: |
1254 | hidnplayr | 1602 | |
1603 | |||
1514 | hidnplayr | 1604 | ;---------------------------------------- |
1605 | ; Check if a window update should be sent |
||
1159 | hidnplayr | 1606 | |
1514 | hidnplayr | 1607 | cmp ecx, 0 ; window |
1608 | jle .no_window |
||
1159 | hidnplayr | 1609 | |
1514 | hidnplayr | 1610 | ;;; TODO 154-172 |
1159 | hidnplayr | 1611 | |
1514 | hidnplayr | 1612 | .no_window: |
1159 | hidnplayr | 1613 | |
1514 | hidnplayr | 1614 | ;-------------------------- |
1615 | ; Should a segment be sent? |
||
1159 | hidnplayr | 1616 | |
1514 | hidnplayr | 1617 | test [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1618 | jnz .send |
||
1159 | hidnplayr | 1619 | |
1514 | hidnplayr | 1620 | test dl, TH_SYN + TH_RST |
1621 | jnz .send |
||
1159 | hidnplayr | 1622 | |
1514 | hidnplayr | 1623 | mov eax, [ebx + TCP_SOCKET.SND_UP] |
1624 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
1625 | jg .send |
||
1249 | hidnplayr | 1626 | |
1514 | hidnplayr | 1627 | test dl, TH_FIN |
1628 | jz .enter_persist |
||
1318 | hidnplayr | 1629 | |
1514 | hidnplayr | 1630 | test [ebx + TCP_SOCKET.t_flags], TF_SENTFIN |
1631 | jnz .send |
||
1254 | hidnplayr | 1632 | |
1514 | hidnplayr | 1633 | mov eax, [ebx + TCP_SOCKET.SND_NXT] |
1634 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
1635 | je .send |
||
1254 | hidnplayr | 1636 | |
1514 | hidnplayr | 1637 | ;-------------------- |
1638 | ; Enter persist state |
||
1318 | hidnplayr | 1639 | |
1514 | hidnplayr | 1640 | .enter_persist: |
1318 | hidnplayr | 1641 | |
1519 | hidnplayr | 1642 | DEBUGF 1,"Entering persist state\n" |
1318 | hidnplayr | 1643 | |
1644 | |||
1645 | |||
1514 | hidnplayr | 1646 | ;-------------------------------------- |
1647 | ; No reason to send a segment, just ret |
||
1318 | hidnplayr | 1648 | |
1514 | hidnplayr | 1649 | DEBUGF 1,"No reason to send a segment\n" |
1318 | hidnplayr | 1650 | |
1514 | hidnplayr | 1651 | ret |
1318 | hidnplayr | 1652 | |
1653 | |||
1654 | |||
1655 | |||
1656 | |||
1514 | hidnplayr | 1657 | ;----------------------------------------------- |
1658 | ; |
||
1659 | ; Send a segment |
||
1660 | ; |
||
1661 | ; ebx = socket pointer |
||
1662 | ; dl = flags |
||
1663 | ; |
||
1664 | ;----------------------------------------------- |
||
1318 | hidnplayr | 1665 | |
1514 | hidnplayr | 1666 | .send: |
1318 | hidnplayr | 1667 | |
1514 | hidnplayr | 1668 | DEBUGF 1,"Preparing to send a segment\n" |
1318 | hidnplayr | 1669 | |
1514 | hidnplayr | 1670 | xor edi, edi ; edi will contain the number of header option bytes |
1318 | hidnplayr | 1671 | |
1514 | hidnplayr | 1672 | ;------------------------------------ |
1673 | ; Send options with first SYN segment |
||
1318 | hidnplayr | 1674 | |
1514 | hidnplayr | 1675 | test dl, TH_SYN |
1676 | jz .no_options |
||
1318 | hidnplayr | 1677 | |
1514 | hidnplayr | 1678 | mov eax, [ebx + TCP_SOCKET.ISS] |
1679 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1318 | hidnplayr | 1680 | |
1514 | hidnplayr | 1681 | test [ebx + TCP_SOCKET.t_flags], TF_NOOPT |
1682 | jnz .no_options |
||
1318 | hidnplayr | 1683 | |
1514 | hidnplayr | 1684 | mov eax, TCP_OPT_MAXSEG shl 24 + 4 shl 16 |
1685 | mov ax, 1280 ;;;;;; |
||
1318 | hidnplayr | 1686 | bswap eax |
1514 | hidnplayr | 1687 | push eax |
1688 | |||
1689 | mov di, 4 |
||
1690 | |||
1691 | test [ebx + TCP_SOCKET.t_flags], TF_REQ_SCALE |
||
1692 | jz .no_syn |
||
1693 | |||
1694 | test dl, TH_ACK |
||
1695 | jnz .scale_opt |
||
1696 | |||
1697 | test [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
||
1698 | jz .no_syn |
||
1699 | |||
1700 | .scale_opt: |
||
1701 | |||
1702 | mov eax, TCP_OPT_WINDOW shl 24 + 4 shl 16 + TCP_OPT_NOP |
||
1703 | mov ah, byte [ebx + TCP_SOCKET.request_r_scale] |
||
1318 | hidnplayr | 1704 | bswap eax |
1514 | hidnplayr | 1705 | push eax |
1255 | hidnplayr | 1706 | |
1514 | hidnplayr | 1707 | add di, 4 |
1159 | hidnplayr | 1708 | |
1514 | hidnplayr | 1709 | .no_syn: |
1159 | hidnplayr | 1710 | |
1514 | hidnplayr | 1711 | ;------------------------------------ |
1712 | ; Make the timestamp option if needed |
||
1159 | hidnplayr | 1713 | |
1514 | hidnplayr | 1714 | test [ebx + TCP_SOCKET.t_flags], TF_REQ_TSTMP |
1715 | jz .no_timestamp |
||
1159 | hidnplayr | 1716 | |
1514 | hidnplayr | 1717 | test dl, TH_RST |
1718 | jnz .no_timestamp |
||
1719 | |||
1720 | test dl, TH_ACK |
||
1721 | jz .timestamp |
||
1722 | |||
1723 | test [ebx + TCP_SOCKET.t_flags], TF_RCVD_TSTMP |
||
1724 | jz .no_timestamp |
||
1725 | |||
1726 | .timestamp: |
||
1727 | |||
1728 | DEBUGF 1,"Creating a timestamp\n" |
||
1729 | |||
1730 | push dword (TCP_OPT_TIMESTAMP shl 8 + 10 + TCP_OPT_NOP shl 16 + TCP_OPT_NOP shl 24) |
||
1731 | pushw 0 |
||
1732 | mov eax, [timer_ticks] |
||
1733 | bswap eax |
||
1734 | push eax |
||
1735 | |||
1736 | add di, 10 |
||
1737 | |||
1738 | .no_timestamp: |
||
1739 | |||
1740 | ;; TODO: check if we dont exceed the max segment size |
||
1741 | |||
1742 | .no_options: |
||
1743 | add edi, TCP_segment.Data |
||
1744 | |||
1745 | ;----------------------------------- |
||
1746 | ; Check if we have some data to send |
||
1747 | |||
1748 | ;;; mov ecx, [huppeldepup] |
||
1749 | |||
1255 | hidnplayr | 1750 | test ecx, ecx |
1514 | hidnplayr | 1751 | jz .no_data |
1159 | hidnplayr | 1752 | |
1514 | hidnplayr | 1753 | ;;; 278-316 |
1281 | hidnplayr | 1754 | |
1514 | hidnplayr | 1755 | jmp .header |
1281 | hidnplayr | 1756 | |
1514 | hidnplayr | 1757 | .no_data: |
1159 | hidnplayr | 1758 | |
1514 | hidnplayr | 1759 | ;;; 317-338 |
1281 | hidnplayr | 1760 | |
1761 | |||
1514 | hidnplayr | 1762 | ;---------- |
1763 | |||
1764 | push di dx ebx |
||
1765 | |||
1766 | add ecx, edi ; total TCP segment size |
||
1767 | |||
1768 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
||
1769 | mov ebx, [ebx + IP_SOCKET.LocalIP] |
||
1770 | mov di , IP_PROTO_TCP |
||
1771 | call IPv4_create_packet |
||
1772 | |||
1773 | ;;;; jz .fail |
||
1774 | |||
1775 | push edx eax |
||
1519 | hidnplayr | 1776 | call [ebx + NET_DEVICE.transmit] |
1159 | hidnplayr | 1777 | ret |
1778 | |||
1514 | hidnplayr | 1779 | ;---------------- |
1159 | hidnplayr | 1780 | |
1249 | hidnplayr | 1781 | |
1514 | hidnplayr | 1782 | ;------------------------------- |
1783 | ; Now, create the 20-byte header |
||
1274 | hidnplayr | 1784 | |
1514 | hidnplayr | 1785 | .header: |
1274 | hidnplayr | 1786 | |
1514 | hidnplayr | 1787 | ;----------------------- |
1788 | ; Fill in the TCP header |
||
1789 | pop esi |
||
1274 | hidnplayr | 1790 | |
1514 | hidnplayr | 1791 | push [esi + TCP_SOCKET.SND_NXT] |
1792 | rol word [esp], 8 |
||
1793 | rol dword [esp], 16 |
||
1794 | pop [edi + TCP_segment.SequenceNumber] |
||
1274 | hidnplayr | 1795 | |
1514 | hidnplayr | 1796 | push [esi + TCP_SOCKET.RCV_NXT] |
1797 | rol word [esp], 8 |
||
1798 | rol dword [esp], 16 |
||
1799 | pop [edi + TCP_segment.AckNumber] |
||
1274 | hidnplayr | 1800 | |
1514 | hidnplayr | 1801 | push [esi + TCP_SOCKET.LocalPort] |
1802 | rol word [esp], 8 |
||
1803 | pop [edi + TCP_segment.SourcePort] |
||
1274 | hidnplayr | 1804 | |
1514 | hidnplayr | 1805 | push [esi + TCP_SOCKET.RemotePort] |
1806 | rol word [esp], 8 |
||
1807 | pop [edi + TCP_segment.DestinationPort] |
||
1254 | hidnplayr | 1808 | |
1809 | |||
1514 | hidnplayr | 1810 | mov [edi + TCP_segment.Window], 0x0005 |
1811 | ; 1280 bytes |
||
1812 | mov [edi + TCP_segment.UrgentPointer], 0 |
||
1159 | hidnplayr | 1813 | |
1514 | hidnplayr | 1814 | mov [edi + TCP_segment.DataOffset], 0x50 |
1159 | hidnplayr | 1815 | |
1514 | hidnplayr | 1816 | mov [edi + TCP_segment.Flags], cl |
1159 | hidnplayr | 1817 | |
1514 | hidnplayr | 1818 | mov [edi + TCP_segment.Checksum], 0 |
1159 | hidnplayr | 1819 | |
1514 | hidnplayr | 1820 | ;----- |
1159 | hidnplayr | 1821 | |
1822 | |||
1514 | hidnplayr | 1823 | ;-------------- |
1824 | ; Copy the data |
||
1159 | hidnplayr | 1825 | |
1514 | hidnplayr | 1826 | pop esi |
1827 | push edi |
||
1828 | add edi, TCP_segment.Data ;; |
||
1829 | sub ecx, TCP_segment.Data ;;; |
||
1249 | hidnplayr | 1830 | |
1514 | hidnplayr | 1831 | shr ecx, 1 |
1832 | jnc .nb |
||
1833 | movsb |
||
1834 | .nb: |
||
1835 | shr ecx, 1 |
||
1836 | jnc .nw |
||
1837 | movsw |
||
1838 | .nw: |
||
1839 | test ecx, ecx |
||
1840 | jz .nd |
||
1841 | rep movsd |
||
1842 | .nd: |
||
1843 | pop edi |
||
1254 | hidnplayr | 1844 | |
1514 | hidnplayr | 1845 | ;-------------------- |
1846 | ; Create the checksum |
||
1254 | hidnplayr | 1847 | |
1514 | hidnplayr | 1848 | push [ebx + IP_SOCKET.LocalIP] |
1849 | push [ebx + IP_SOCKET.RemoteIP] |
||
1850 | call TCP_checksum |
||
1159 | hidnplayr | 1851 | |
1514 | hidnplayr | 1852 | ;---------------- |
1853 | ; Send the packet |
||
1159 | hidnplayr | 1854 | |
1514 | hidnplayr | 1855 | ;;;;; |
1159 | hidnplayr | 1856 | |
1514 | hidnplayr | 1857 | |
1858 | DEBUGF 1,"Sending TCP Packet to device %x\n", ebx |
||
1519 | hidnplayr | 1859 | call [ebx + NET_DEVICE.transmit] |
1159 | hidnplayr | 1860 | ret |
1861 | |||
1514 | hidnplayr | 1862 | ;------------------------- |
1863 | ; |
||
1864 | ; TCP_outflags |
||
1865 | ; |
||
1866 | ; IN: eax = socket ptr |
||
1867 | ; |
||
1868 | ; OUT: edx = flags |
||
1869 | ; |
||
1870 | ;------------------------- |
||
1249 | hidnplayr | 1871 | align 4 |
1514 | hidnplayr | 1872 | TCP_outflags: |
1254 | hidnplayr | 1873 | |
1514 | hidnplayr | 1874 | mov edx, [eax + TCP_SOCKET.t_state] |
1875 | movzx edx, byte [edx + .flaglist] |
||
1254 | hidnplayr | 1876 | |
1514 | hidnplayr | 1877 | DEBUGF 1,"TCP_outflags, socket: %x, flags: %x\n", eax, dl |
1878 | |||
1159 | hidnplayr | 1879 | ret |
1880 | |||
1514 | hidnplayr | 1881 | .flaglist: |
1159 | hidnplayr | 1882 | |
1514 | hidnplayr | 1883 | db TH_RST + TH_ACK ; TCB_CLOSED |
1884 | db 0 ; TCB_LISTEN |
||
1885 | db TH_SYN ; TCB_SYN_SENT |
||
1886 | db TH_SYN + TH_ACK ; TCB_SYN_RECEIVED |
||
1887 | db TH_ACK ; TCB_ESTABLISHED |
||
1888 | db TH_ACK ; TCB_CLOSE_WAIT |
||
1889 | db TH_SYN + TH_ACK ; TCB_FIN_WAIT_1 |
||
1890 | db TH_SYN + TH_ACK ; TCB_CLOSING |
||
1891 | db TH_SYN + TH_ACK ; TCB_LAST_ACK |
||
1892 | db TH_ACK ; TCB_FIN_WAIT_2 |
||
1893 | db TH_ACK ; TCB_TIMED_WAIT |
||
1249 | hidnplayr | 1894 | |
1514 | hidnplayr | 1895 | |
1896 | ;------------------------- |
||
1897 | ; |
||
1898 | ; TCP_drop |
||
1899 | ; |
||
1900 | ; IN: eax = socket ptr |
||
1901 | ; |
||
1902 | ; OUT: / |
||
1903 | ; |
||
1904 | ;------------------------- |
||
1249 | hidnplayr | 1905 | align 4 |
1514 | hidnplayr | 1906 | TCP_drop: |
1254 | hidnplayr | 1907 | |
1514 | hidnplayr | 1908 | DEBUGF 1,"TCP_drop\n" |
1254 | hidnplayr | 1909 | |
1514 | hidnplayr | 1910 | ; cmp [eax + TCP_SOCKET.t_state], TCB_SYN_RECEIVED |
1911 | ; jl .no_syn_received |
||
1159 | hidnplayr | 1912 | |
1514 | hidnplayr | 1913 | mov [eax + TCP_SOCKET.t_state], TCB_CLOSED |
1159 | hidnplayr | 1914 | |
1514 | hidnplayr | 1915 | call TCP_output |
1254 | hidnplayr | 1916 | |
1514 | hidnplayr | 1917 | ; .no_syn_received: |
1918 | |||
1159 | hidnplayr | 1919 | ret |
1920 | |||
1921 | |||
1254 | hidnplayr | 1922 | |
1923 | |||
1159 | hidnplayr | 1924 | |
1514 | hidnplayr | 1925 | ;--------------------------------------- |
1926 | ; |
||
1519 | hidnplayr | 1927 | ; TCP_ack |
1514 | hidnplayr | 1928 | ; |
1519 | hidnplayr | 1929 | ; The easy way to send an ACK/RST/keepalive segment |
1514 | hidnplayr | 1930 | ; |
1931 | ; IN: eax = socket ptr |
||
1519 | hidnplayr | 1932 | ; -or- |
1933 | ; edx = packet ptr (eax must be 0) |
||
1934 | ; cl = flags |
||
1514 | hidnplayr | 1935 | ; |
1936 | ; OUT: / |
||
1937 | ; |
||
1938 | ;--------------------------------------- |
||
1939 | align 4 |
||
1940 | TCP_respond: |
||
1254 | hidnplayr | 1941 | |
1514 | hidnplayr | 1942 | DEBUGF 1,"TCP_respond\n" |
1159 | hidnplayr | 1943 | |
1519 | hidnplayr | 1944 | ;--------------------- |
1945 | ; Create the IP packet |
||
1946 | |||
1947 | push cx eax edx |
||
1948 | mov ebx, [eax + IP_SOCKET.LocalIP] |
||
1949 | mov eax, [eax + IP_SOCKET.RemoteIP] |
||
1950 | mov ecx, TCP_segment.Data |
||
1951 | mov di , IP_PROTO_TCP |
||
1952 | call IPv4_create_packet |
||
1953 | test edi, edi |
||
1954 | jz .error |
||
1955 | |||
1956 | ;--------------------------- |
||
1957 | ; Now fill in the TCP header |
||
1958 | |||
1959 | pop ecx |
||
1960 | pop esi |
||
1961 | |||
1962 | test esi, esi |
||
1963 | ; jz |
||
1964 | |||
1965 | |||
1966 | push edx eax |
||
1967 | |||
1968 | push dword .checksum |
||
1969 | je .use_segment |
||
1970 | jmp .use_socket |
||
1971 | |||
1972 | ;--------------------- |
||
1973 | ; Fill in the checksum |
||
1974 | |||
1975 | .checksum: |
||
1976 | |||
1977 | push [esi + IP_SOCKET.LocalIP] |
||
1978 | push [esi + IP_SOCKET.RemoteIP] |
||
1979 | lea esi, [edi - 20] |
||
1980 | xor ecx, ecx |
||
1981 | call TCP_checksum |
||
1982 | |||
1983 | ;-------------------- |
||
1984 | ; And send the segment |
||
1985 | |||
1986 | call [ebx + NET_DEVICE.transmit] |
||
1159 | hidnplayr | 1987 | ret |
1988 | |||
1519 | hidnplayr | 1989 | .error: |
1990 | DEBUGF 1,"TCP_ack failed\n" |
||
1991 | add esp, 4 |
||
1159 | hidnplayr | 1992 | |
1519 | hidnplayr | 1993 | ret |
1514 | hidnplayr | 1994 | |
1519 | hidnplayr | 1995 | ;--------------------------------------------------- |
1996 | ; Fill in the TCP header by using a received segment |
||
1997 | |||
1998 | .use_segment: |
||
1999 | |||
2000 | mov ax, [esi + TCP_segment.DestinationPort] |
||
2001 | rol ax, 8 |
||
2002 | stosw |
||
2003 | mov ax, [esi + TCP_segment.SourcePort] |
||
2004 | rol ax, 8 |
||
2005 | stosw |
||
2006 | mov eax, [esi + TCP_segment.AckNumber] |
||
2007 | bswap eax |
||
2008 | stosd |
||
2009 | xor eax, eax |
||
2010 | stosd |
||
2011 | mov al, 0x50 ; Dataoffset: 20 bytes |
||
2012 | stosb |
||
2013 | mov al, cl |
||
2014 | stosb |
||
2015 | mov ax, 1280 |
||
2016 | rol ax, 8 |
||
2017 | stosw ; window |
||
2018 | xor eax, eax |
||
2019 | stosd ; checksum + urgentpointer |
||
2020 | |||
2021 | ret |
||
2022 | |||
2023 | |||
2024 | ;----------------------------------------------- |
||
2025 | ; Fill in the TCP header by using the socket ptr |
||
2026 | |||
2027 | .use_socket: |
||
2028 | |||
2029 | mov ax, [esi + TCP_SOCKET.LocalPort] |
||
2030 | rol ax, 8 |
||
2031 | stosw |
||
2032 | mov ax, [esi + TCP_SOCKET.RemotePort] |
||
2033 | rol ax, 8 |
||
2034 | stosw |
||
2035 | mov eax, [esi + TCP_SOCKET.SND_NXT] |
||
2036 | bswap eax |
||
2037 | stosd |
||
2038 | mov eax, [esi + TCP_SOCKET.RCV_NXT] |
||
2039 | bswap eax |
||
2040 | stosd |
||
2041 | mov al, 0x50 ; Dataoffset: 20 bytes |
||
2042 | stosb |
||
2043 | mov al, cl |
||
2044 | stosb |
||
2045 | mov ax, [esi + TCP_SOCKET.RCV_WND] |
||
2046 | rol ax, 8 |
||
2047 | stosw ; window |
||
2048 | xor eax, eax |
||
2049 | stosd ; checksum + urgentpointer |
||
2050 | |||
2051 | ret |
||
2052 | |||
2053 | |||
2054 | |||
1514 | hidnplayr | 2055 | ;----------------------------------------------------------------- |
2056 | ; |
||
2057 | ; TCP_checksum |
||
2058 | ; |
||
2059 | ; This is the fast procedure to create or check a UDP header |
||
2060 | ; - To create a new checksum, the checksum field must be set to 0 before computation |
||
2061 | ; - To check an existing checksum, leave the checksum as is, |
||
2062 | ; and it will be 0 after this procedure, if it was correct |
||
2063 | ; |
||
2064 | ; IN: push source ip |
||
2065 | ; push dest ip |
||
2066 | ; |
||
2067 | ; esi = packet ptr |
||
2068 | ; |
||
2069 | ; OUT: checksum is filled in in packet! (but also in dx) |
||
2070 | ; |
||
2071 | ;----------------------------------------------------------------- |
||
1249 | hidnplayr | 2072 | align 4 |
1514 | hidnplayr | 2073 | TCP_checksum: |
1254 | hidnplayr | 2074 | |
1514 | hidnplayr | 2075 | ;------------- |
2076 | ; Pseudoheader |
||
1254 | hidnplayr | 2077 | |
1514 | hidnplayr | 2078 | ; protocol type |
2079 | mov edx, IP_PROTO_TCP ; NO shl 8 here ! (it took me ages to figure this one out) |
||
1254 | hidnplayr | 2080 | |
1514 | hidnplayr | 2081 | ; source address |
2082 | add dl, [esp+1+4] |
||
2083 | adc dh, [esp+0+4] |
||
2084 | adc dl, [esp+3+4] |
||
2085 | adc dh, [esp+2+4] |
||
1159 | hidnplayr | 2086 | |
1514 | hidnplayr | 2087 | ; destination address |
2088 | adc dl, [esp+1+8] |
||
2089 | adc dh, [esp+0+8] |
||
2090 | adc dl, [esp+3+8] |
||
2091 | adc dh, [esp+2+8] |
||
1159 | hidnplayr | 2092 | |
1514 | hidnplayr | 2093 | ; size |
2094 | adc dl, cl |
||
2095 | adc dh, ch |
||
1254 | hidnplayr | 2096 | |
1514 | hidnplayr | 2097 | ;--------------------- |
2098 | ; Real header and data |
||
1254 | hidnplayr | 2099 | |
1514 | hidnplayr | 2100 | push esi |
2101 | call checksum_1 |
||
2102 | call checksum_2 |
||
2103 | pop esi |
||
1254 | hidnplayr | 2104 | |
1514 | hidnplayr | 2105 | neg [esi+UDP_Packet.Checksum] ; zero will stay zero so we just get the checksum |
2106 | add [esi+UDP_Packet.Checksum], dx ; , else we will get (new checksum - old checksum) in the end, wich should be 0 :) |
||
1159 | hidnplayr | 2107 | |
1514 | hidnplayr | 2108 | ret 8 ; Remove the IPs from stack |
1159 | hidnplayr | 2109 | |
2110 | |||
1514 | hidnplayr | 2111 | |
2112 | |||
1254 | hidnplayr | 2113 | ;--------------------------------------------------------------------------- |
2114 | ; |
||
2115 | ; TCP_API |
||
2116 | ; |
||
2117 | ; This function is called by system function 75 |
||
2118 | ; |
||
2119 | ; IN: subfunction number in bl |
||
2120 | ; device number in bh |
||
2121 | ; ecx, edx, .. depends on subfunction |
||
2122 | ; |
||
2123 | ; OUT: |
||
2124 | ; |
||
2125 | ;--------------------------------------------------------------------------- |
||
2126 | align 4 |
||
2127 | TCP_API: |
||
2128 | |||
2129 | movzx eax, bh |
||
2130 | shl eax, 2 |
||
2131 | |||
2132 | test bl, bl |
||
2133 | jz .packets_tx ; 0 |
||
2134 | dec bl |
||
2135 | jz .packets_rx ; 1 |
||
2136 | |||
2137 | .error: |
||
2138 | mov eax, -1 |
||
2139 | ret |
||
2140 | |||
2141 | .packets_tx: |
||
1514 | hidnplayr | 2142 | add eax, TCP_segments_tx |
1254 | hidnplayr | 2143 | mov eax, [eax] |
2144 | ret |
||
2145 | |||
2146 | .packets_rx: |
||
1514 | hidnplayr | 2147 | add eax, TCP_segments_rx |
1254 | hidnplayr | 2148 | mov eax, [eax] |
2149 | ret |