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3545 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2004-2013. All rights reserved. ;; |
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4 | ;; Distributed under terms of the GNU General Public License ;; |
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5 | ;; ;; |
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6 | ;; STACK.INC ;; |
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7 | ;; ;; |
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8 | ;; TCP/IP stack for KolibriOS ;; |
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9 | ;; ;; |
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10 | ;; Written by hidnplayr@kolibrios.org ;; |
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11 | ;; ;; |
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12 | ;; Some parts of code are based on the work of: ;; |
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13 | ;; Mike Hibbett (menuetos network stack) ;; |
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14 | ;; Eugen Brasoveanu (solar os network stack and drivers) ;; |
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15 | ;; mike.dld (kolibrios socket code) ;; |
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16 | ;; ;; |
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17 | ;; TCP part is based on 4.4BSD ;; |
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18 | ;; ;; |
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19 | ;; GNU GENERAL PUBLIC LICENSE ;; |
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20 | ;; Version 2, June 1991 ;; |
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21 | ;; ;; |
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22 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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23 | |||
24 | $Revision: 3523 $ |
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25 | |||
26 | uglobal |
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27 | net_10ms dd ? |
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28 | net_tmr_count dw ? |
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29 | endg |
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30 | |||
31 | MAX_NET_DEVICES = 16 |
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32 | ARP_BLOCK = 1 ; true or false |
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33 | |||
34 | MIN_EPHEMERAL_PORT = 49152 |
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35 | MIN_EPHEMERAL_PORT_N = 0x00C0 ; same in Network byte order (FIXME) |
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36 | MAX_EPHEMERAL_PORT = 61000 |
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37 | MAX_EPHEMERAL_PORT_N = 0x48EE ; same in Network byte order (FIXME) |
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38 | |||
39 | ; Ethernet protocol numbers |
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40 | ETHER_ARP = 0x0608 |
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41 | ETHER_IPv4 = 0x0008 |
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42 | ETHER_IPv6 = 0xDD86 |
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43 | ETHER_PPP_DISCOVERY = 0x6388 |
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44 | ETHER_PPP_SESSION = 0x6488 |
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45 | |||
46 | ; PPP protocol numbers |
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47 | PPP_IPv4 = 0x2100 |
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48 | PPP_IPV6 = 0x5780 |
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49 | |||
50 | ;Protocol family |
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51 | AF_UNSPEC = 0 |
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52 | AF_LOCAL = 1 |
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53 | AF_INET4 = 2 |
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54 | AF_INET6 = 10 |
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55 | AF_PPP = 777 |
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56 | |||
57 | ; Internet protocol numbers |
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58 | IP_PROTO_IP = 0 |
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59 | IP_PROTO_ICMP = 1 |
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60 | IP_PROTO_TCP = 6 |
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61 | IP_PROTO_UDP = 17 |
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62 | |||
63 | ; PPP protocol number |
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64 | PPP_PROTO_ETHERNET = 666 |
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65 | |||
66 | ; Socket types |
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67 | SOCK_STREAM = 1 |
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68 | SOCK_DGRAM = 2 |
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69 | SOCK_RAW = 3 |
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70 | |||
71 | ; Socket options |
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72 | SO_ACCEPTCON = 1 shl 0 |
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73 | SO_BROADCAST = 1 shl 1 |
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74 | SO_DEBUG = 1 shl 2 |
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75 | SO_DONTROUTE = 1 shl 3 |
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76 | SO_KEEPALIVE = 1 shl 4 |
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77 | SO_OOBINLINE = 1 shl 5 |
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78 | SO_REUSEADDR = 1 shl 6 |
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79 | SO_REUSEPORT = 1 shl 7 |
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80 | SO_USELOOPBACK = 1 shl 8 |
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81 | SO_BINDTODEVICE = 1 shl 9 |
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82 | |||
83 | SO_BLOCK = 1 shl 10 ; TO BE REMOVED |
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84 | SO_NONBLOCK = 1 shl 31 |
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85 | |||
86 | ; Socket flags for user calls |
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87 | MSG_PEEK = 0x02 |
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88 | MSG_DONTWAIT = 0x40 |
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89 | |||
90 | ; Socket level |
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91 | SOL_SOCKET = 0 |
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92 | |||
93 | |||
94 | ; Socket States |
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95 | SS_NOFDREF = 0x0001 ; no file table ref any more |
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96 | SS_ISCONNECTED = 0x0002 ; socket connected to a peer |
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97 | SS_ISCONNECTING = 0x0004 ; in process of connecting to peer |
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98 | SS_ISDISCONNECTING = 0x0008 ; in process of disconnecting |
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99 | SS_CANTSENDMORE = 0x0010 ; can't send more data to peer |
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100 | SS_CANTRCVMORE = 0x0020 ; can't receive more data from peer |
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101 | SS_RCVATMARK = 0x0040 ; at mark on input |
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102 | SS_ISABORTING = 0x0080 ; aborting fd references - close() |
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103 | SS_RESTARTSYS = 0x0100 ; restart blocked system calls |
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104 | SS_ISDISCONNECTED = 0x0800 ; socket disconnected from peer |
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105 | |||
106 | SS_ASYNC = 0x0100 ; async i/o notify |
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107 | SS_ISCONFIRMING = 0x0200 ; deciding to accept connection req |
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108 | SS_MORETOCOME = 0x0400 |
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109 | |||
110 | SS_BLOCKED = 0x8000 |
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111 | |||
112 | |||
113 | SOCKET_MAXDATA = 4096*32 ; must be 4096*(power of 2) where 'power of 2' is at least 8 |
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114 | |||
115 | ; Network driver types |
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116 | NET_TYPE_LOOPBACK = 0 |
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117 | NET_TYPE_ETH = 1 |
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118 | NET_TYPE_SLIP = 2 |
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119 | |||
120 | MAX_backlog = 20 ; maximum backlog for stream sockets |
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121 | |||
122 | ; Error Codes |
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123 | ENOBUFS = 55 |
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124 | ECONNREFUSED = 61 |
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125 | ECONNRESET = 52 |
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126 | ETIMEDOUT = 60 |
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127 | ECONNABORTED = 53 |
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128 | |||
129 | ; Api protocol numbers |
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130 | API_ETH = 0 |
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131 | API_IPv4 = 1 |
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132 | API_ICMP = 2 |
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133 | API_UDP = 3 |
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134 | API_TCP = 4 |
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135 | API_ARP = 5 |
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136 | API_PPPOE = 6 |
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137 | API_IPv6 = 7 |
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138 | |||
139 | HWACC_TCP_IPv4 = 1 shl 0 |
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140 | |||
141 | struct NET_DEVICE |
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142 | |||
143 | type dd ? ; Type field |
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144 | mtu dd ? ; Maximal Transmission Unit |
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145 | name dd ? ; Ptr to 0 terminated string |
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146 | |||
147 | unload dd ? ; Ptrs to driver functions |
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148 | reset dd ? ; |
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149 | transmit dd ? ; |
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150 | |||
151 | bytes_tx dq ? ; Statistics, updated by the driver |
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152 | bytes_rx dq ? ; |
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153 | packets_tx dd ? ; |
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154 | packets_rx dd ? ; |
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155 | |||
156 | state dd ? ; link state (0 = no link) |
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157 | hwacc dd ? ; bitmask stating enabled HW accelerations (offload engines) |
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158 | |||
159 | ends |
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160 | |||
161 | |||
162 | ; Exactly as it says.. |
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163 | macro pseudo_random reg { |
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164 | add reg, [esp] |
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165 | rol reg, 5 |
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166 | xor reg, [timer_ticks] |
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167 | ; add reg, [CPU_FREQ] |
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168 | imul reg, 214013 |
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169 | xor reg, 0xdeadbeef |
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170 | rol reg, 9 |
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171 | } |
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172 | |||
173 | ; Network to Hardware byte order (dword) |
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174 | macro ntohd reg { |
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175 | |||
176 | rol word reg, 8 |
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177 | rol dword reg, 16 |
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178 | rol word reg , 8 |
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179 | |||
180 | } |
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181 | |||
182 | ; Network to Hardware byte order (word) |
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183 | macro ntohw reg { |
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184 | |||
185 | rol word reg, 8 |
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186 | |||
187 | } |
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188 | |||
189 | |||
190 | include "queue.inc" |
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191 | |||
192 | include "loopback.inc" |
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193 | include "ethernet.inc" |
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194 | |||
195 | include "PPPoE.inc" |
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196 | |||
197 | include "ARP.inc" |
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198 | include "IPv4.inc" |
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199 | include "IPv6.inc" |
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200 | |||
201 | include "icmp.inc" |
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202 | include "udp.inc" |
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203 | include "tcp.inc" |
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204 | |||
205 | include "socket.inc" |
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206 | |||
207 | |||
208 | |||
209 | align 4 |
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210 | uglobal |
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211 | |||
212 | NET_RUNNING dd ? |
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213 | NET_DEFAULT dd ? |
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214 | NET_DRV_LIST rd MAX_NET_DEVICES |
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215 | |||
216 | endg |
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217 | |||
218 | |||
219 | ;----------------------------------------------------------------- |
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220 | ; |
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221 | ; stack_init |
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222 | ; |
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223 | ; This function calls all network init procedures |
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224 | ; |
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225 | ; IN: / |
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226 | ; OUT: / |
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227 | ; |
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228 | ;----------------------------------------------------------------- |
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229 | align 4 |
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230 | stack_init: |
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231 | |||
232 | ; Init the network drivers list |
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233 | xor eax, eax |
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234 | mov edi, NET_RUNNING |
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235 | mov ecx, (MAX_NET_DEVICES + 2) |
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236 | rep stosd |
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237 | |||
238 | PPPoE_init |
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239 | |||
240 | IPv4_init |
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241 | ; IPv6_init |
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242 | ICMP_init |
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243 | |||
244 | ARP_init |
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245 | UDP_init |
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246 | TCP_init |
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247 | |||
248 | SOCKET_init |
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249 | |||
250 | mov [net_tmr_count], 0 |
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251 | |||
252 | ret |
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253 | |||
254 | |||
255 | |||
256 | ; Wakeup every tick. |
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257 | proc stack_handler_has_work? |
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258 | |||
259 | mov eax, [timer_ticks] |
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260 | cmp eax, [net_10ms] |
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261 | |||
262 | ret |
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263 | endp |
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264 | |||
265 | |||
266 | ;----------------------------------------------------------------- |
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267 | ; |
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268 | ; stack_handler |
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269 | ; |
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270 | ; This function is called in kernel loop |
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271 | ; |
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272 | ; IN: / |
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273 | ; OUT: / |
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274 | ; |
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275 | ;----------------------------------------------------------------- |
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276 | align 4 |
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277 | stack_handler: |
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278 | |||
279 | ; Test for 10ms tick |
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280 | mov eax, [timer_ticks] |
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281 | cmp eax, [net_10ms] |
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282 | je .exit |
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283 | mov [net_10ms], eax |
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284 | |||
285 | cmp [NET_RUNNING], 0 |
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286 | je .exit |
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287 | |||
288 | test [net_10ms], 0x0f ; 160ms |
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289 | jnz .exit |
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290 | |||
291 | TCP_timer_160ms |
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292 | |||
293 | test [net_10ms], 0x3f ; 640ms |
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294 | jnz .exit |
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295 | |||
296 | TCP_timer_640ms |
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297 | ARP_decrease_entry_ttls |
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298 | IPv4_decrease_fragment_ttls |
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299 | |||
300 | .exit: |
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301 | ret |
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302 | |||
303 | |||
304 | |||
305 | align 4 |
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306 | NET_link_changed: |
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307 | |||
308 | DEBUGF 1,"NET_link_changed device=0x%x status=0x%x\n", ebx, [ebx + NET_DEVICE.state] |
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309 | |||
310 | align 4 |
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311 | NET_send_event: |
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312 | |||
313 | DEBUGF 1,"NET_send_event\n" |
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314 | |||
315 | ; Send event to all applications |
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316 | push edi ecx |
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317 | mov edi, SLOT_BASE |
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318 | mov ecx, [TASK_COUNT] |
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319 | .loop: |
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320 | add edi, 256 |
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321 | or [edi + APPDATA.event_mask], EVENT_NETWORK2 |
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322 | loop .loop |
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323 | pop ecx edi |
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324 | |||
325 | ret |
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326 | |||
327 | |||
328 | |||
329 | ;----------------------------------------------------------------- |
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330 | ; |
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331 | ; NET_add_device: |
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332 | ; |
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333 | ; This function is called by the network drivers, |
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334 | ; to register each running NIC to the kernel |
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335 | ; |
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336 | ; IN: Pointer to device structure in ebx |
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337 | ; OUT: Device num in eax, -1 on error |
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338 | ; |
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339 | ;----------------------------------------------------------------- |
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340 | align 4 |
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341 | NET_add_device: |
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342 | |||
343 | DEBUGF 1,"NET_Add_Device: %x\n", ebx ;;; TODO: use mutex to lock net device list |
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344 | |||
345 | cmp [NET_RUNNING], MAX_NET_DEVICES |
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346 | jae .error |
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347 | |||
348 | ;---------------------------------- |
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349 | ; Check if device is already listed |
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350 | mov eax, ebx |
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351 | mov ecx, MAX_NET_DEVICES ; We need to check whole list because a device may be removed without re-organizing list |
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352 | mov edi, NET_DRV_LIST |
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353 | |||
354 | repne scasd ; See if device is already in the list |
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355 | jz .error |
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356 | |||
357 | ;---------------------------- |
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358 | ; Find empty slot in the list |
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359 | xor eax, eax |
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360 | mov ecx, MAX_NET_DEVICES |
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361 | mov edi, NET_DRV_LIST |
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362 | |||
363 | repne scasd |
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364 | jnz .error |
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365 | |||
366 | sub edi, 4 |
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367 | |||
368 | ;----------------------------- |
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369 | ; Add device to the found slot |
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370 | mov [edi], ebx ; add device to list |
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371 | |||
372 | mov eax, edi ; Calculate device number in eax |
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373 | sub eax, NET_DRV_LIST |
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374 | shr eax, 2 |
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375 | |||
376 | inc [NET_RUNNING] ; Indicate that one more network device is up and running |
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377 | |||
378 | cmp eax, 1 ; If it's the first network device, try to set it as default |
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379 | jne @f |
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380 | push eax |
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381 | call NET_set_default |
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382 | pop eax |
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383 | @@: |
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384 | |||
385 | call NET_send_event |
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386 | |||
387 | DEBUGF 1,"Device number: %u\n", eax |
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388 | ret |
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389 | |||
390 | .error: |
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391 | or eax, -1 |
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392 | DEBUGF 2,"Adding network device failed\n" |
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393 | ret |
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394 | |||
395 | |||
396 | |||
397 | ;----------------------------------------------------------------- |
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398 | ; |
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399 | ; NET_set_default |
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400 | ; |
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401 | ; API to set the default interface |
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402 | ; |
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403 | ; IN: Device num in eax |
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404 | ; OUT: Device num in eax, -1 on error |
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405 | ; |
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406 | ;----------------------------------------------------------------- |
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407 | align 4 |
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408 | NET_set_default: |
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409 | |||
410 | DEBUGF 1,"NET_set_default: device=%x\n", eax |
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411 | |||
412 | cmp eax, MAX_NET_DEVICES |
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413 | jae .error |
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414 | |||
415 | cmp [NET_DRV_LIST+eax*4], 0 |
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416 | je .error |
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417 | |||
418 | mov [NET_DEFAULT], eax |
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419 | |||
420 | DEBUGF 1,"NET_set_default: succes\n" |
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421 | ret |
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422 | |||
423 | .error: |
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424 | or eax, -1 |
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425 | DEBUGF 1,"NET_set_default: failed\n" |
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426 | ret |
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427 | |||
428 | |||
429 | ;----------------------------------------------------------------- |
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430 | ; |
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431 | ; NET_Remove_Device: |
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432 | ; |
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433 | ; This function is called by etwork drivers, |
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434 | ; to unregister network devices from the kernel |
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435 | ; |
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436 | ; IN: Pointer to device structure in ebx |
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437 | ; OUT: eax: -1 on error |
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438 | ; |
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439 | ;----------------------------------------------------------------- |
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440 | align 4 |
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441 | NET_remove_device: |
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442 | |||
443 | cmp [NET_RUNNING], 0 |
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444 | je .error |
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445 | |||
446 | cmp [NET_DRV_LIST], ebx |
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447 | jne @f |
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448 | mov [NET_DRV_LIST], 0 |
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449 | cmp [NET_RUNNING], 1 |
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450 | je @f |
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451 | ; there are still active devices, find one and make it default |
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452 | xor eax, eax |
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453 | mov ecx, MAX_NET_DEVICES |
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454 | mov edi, NET_DRV_LIST |
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455 | repe scasd |
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456 | je @f |
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457 | shr edi, 2 |
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458 | dec edi |
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459 | mov [NET_DEFAULT], edi |
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460 | @@: |
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461 | |||
462 | ;---------------------------- |
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463 | ; Find the driver in the list |
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464 | |||
465 | mov eax, ebx |
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466 | mov ecx, MAX_NET_DEVICES |
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467 | mov edi, NET_DRV_LIST+4 |
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468 | |||
469 | repne scasd |
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470 | jnz .error |
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471 | |||
472 | ;------------------------ |
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473 | ; Remove it from the list |
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474 | |||
475 | xor eax, eax |
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476 | mov dword [edi-4], eax |
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477 | |||
478 | call NET_send_event |
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479 | |||
480 | dec [NET_RUNNING] |
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481 | ret |
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482 | |||
483 | .error: |
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484 | or eax, -1 |
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485 | ret |
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486 | |||
487 | |||
488 | |||
489 | ;----------------------------------------------------------------- |
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490 | ; |
||
491 | ; NET_ptr_to_num |
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492 | ; |
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493 | ; IN: ebx = ptr to device struct |
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494 | ; OUT: edi = -1 on error, device number otherwise |
||
495 | ; |
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496 | ;----------------------------------------------------------------- |
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497 | align 4 |
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498 | NET_ptr_to_num: |
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499 | push ecx |
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500 | |||
501 | mov ecx, MAX_NET_DEVICES |
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502 | mov edi, NET_DRV_LIST |
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503 | |||
504 | .loop: |
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505 | cmp ebx, [edi] |
||
506 | jz .found |
||
507 | add edi, 4 |
||
508 | dec ecx |
||
509 | jnz .loop |
||
510 | |||
511 | ; repnz scasd could work too if eax is used instead of ebx! |
||
512 | |||
513 | or edi, -1 |
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514 | |||
515 | pop ecx |
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516 | ret |
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517 | |||
518 | .found: |
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519 | sub edi, NET_DRV_LIST |
||
520 | shr edi, 2 |
||
521 | |||
522 | pop ecx |
||
523 | ret |
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524 | |||
525 | ;----------------------------------------------------------------- |
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526 | ; |
||
527 | ; checksum_1 |
||
528 | ; |
||
529 | ; This is the first of two functions needed to calculate a checksum. |
||
530 | ; |
||
531 | ; IN: edx = start offset for semi-checksum |
||
532 | ; esi = pointer to data |
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533 | ; ecx = data size |
||
534 | ; OUT: edx = semi-checksum |
||
535 | ; |
||
536 | ; |
||
537 | ; Code was optimized by diamond |
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538 | ; |
||
539 | ;----------------------------------------------------------------- |
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540 | align 4 |
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541 | checksum_1: |
||
542 | |||
543 | shr ecx, 1 |
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544 | pushf |
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545 | jz .no_2 |
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546 | |||
547 | shr ecx, 1 |
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548 | pushf |
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549 | jz .no_4 |
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550 | |||
551 | shr ecx, 1 |
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552 | pushf |
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553 | jz .no_8 |
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554 | |||
555 | .loop: |
||
556 | add dl, [esi+1] |
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557 | adc dh, [esi+0] |
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558 | |||
559 | adc dl, [esi+3] |
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560 | adc dh, [esi+2] |
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561 | |||
562 | adc dl, [esi+5] |
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563 | adc dh, [esi+4] |
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564 | |||
565 | adc dl, [esi+7] |
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566 | adc dh, [esi+6] |
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567 | |||
568 | adc edx, 0 |
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569 | add esi, 8 |
||
570 | |||
571 | dec ecx |
||
572 | jnz .loop |
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573 | |||
574 | adc edx, 0 |
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575 | |||
576 | .no_8: |
||
577 | popf |
||
578 | jnc .no_4 |
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579 | |||
580 | add dl, [esi+1] |
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581 | adc dh, [esi+0] |
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582 | |||
583 | adc dl, [esi+3] |
||
584 | adc dh, [esi+2] |
||
585 | |||
586 | adc edx, 0 |
||
587 | add esi, 4 |
||
588 | |||
589 | .no_4: |
||
590 | popf |
||
591 | jnc .no_2 |
||
592 | |||
593 | add dl, [esi+1] |
||
594 | adc dh, [esi+0] |
||
595 | |||
596 | adc edx, 0 |
||
597 | inc esi |
||
598 | inc esi |
||
599 | |||
600 | .no_2: |
||
601 | popf |
||
602 | jnc .end |
||
603 | |||
604 | add dh, [esi+0] |
||
605 | adc edx, 0 |
||
606 | .end: |
||
607 | ret |
||
608 | |||
609 | ;----------------------------------------------------------------- |
||
610 | ; |
||
611 | ; checksum_2 |
||
612 | ; |
||
613 | ; This function calculates the final ip/tcp/udp checksum for you |
||
614 | ; |
||
615 | ; IN: edx = semi-checksum |
||
616 | ; OUT: dx = checksum (in INET byte order) |
||
617 | ; |
||
618 | ;----------------------------------------------------------------- |
||
619 | align 4 |
||
620 | checksum_2: |
||
621 | |||
622 | mov ecx, edx |
||
623 | shr ecx, 16 |
||
624 | and edx, 0xffff |
||
625 | add edx, ecx |
||
626 | |||
627 | mov ecx, edx |
||
628 | shr ecx, 16 |
||
629 | add dx, cx |
||
630 | test dx, dx ; it seems that ZF is not set when CF is set :( |
||
631 | not dx |
||
632 | jnz .not_zero |
||
633 | dec dx |
||
634 | .not_zero: |
||
635 | xchg dl, dh |
||
636 | |||
637 | DEBUGF 1,"Checksum: %x\n", dx |
||
638 | |||
639 | ret |
||
640 | |||
641 | |||
642 | |||
643 | ;---------------------------------------------------------------- |
||
644 | ; |
||
645 | ; System function to work with network devices (75) |
||
646 | ; |
||
647 | ;---------------------------------------------------------------- |
||
648 | align 4 |
||
649 | sys_network: ; FIXME: make default device easily accessible |
||
650 | |||
651 | cmp ebx, -1 |
||
652 | jne @f |
||
653 | |||
654 | mov eax, [NET_RUNNING] |
||
655 | jmp .return |
||
656 | |||
657 | @@: |
||
658 | cmp bh, MAX_NET_DEVICES ; Check if device number exists |
||
659 | jae .doesnt_exist |
||
660 | |||
661 | mov esi, ebx |
||
662 | and esi, 0x0000ff00 |
||
663 | shr esi, 6 |
||
664 | |||
665 | cmp dword [esi + NET_DRV_LIST], 0 ; check if driver is running |
||
666 | je .doesnt_exist |
||
667 | |||
668 | mov eax, [esi + NET_DRV_LIST] |
||
669 | |||
670 | and ebx, 0x000000ff |
||
671 | cmp ebx, .number |
||
672 | ja .doesnt_exist |
||
673 | jmp dword [.table + 4*ebx] |
||
674 | |||
675 | .table: |
||
676 | dd .get_type ; 0 |
||
677 | dd .get_dev_name ; 1 |
||
678 | dd .reset ; 2 |
||
679 | dd .stop ; 3 |
||
680 | dd .get_ptr ; 4 |
||
681 | dd .get_drv_name ; 5 |
||
682 | dd .set_default ; 6 |
||
683 | .number = ($ - .table) / 4 - 1 |
||
684 | |||
685 | .get_type: ; 0 = Get device type (ethernet/token ring/...) |
||
686 | |||
687 | mov eax, [eax + NET_DEVICE.type] |
||
688 | jmp .return |
||
689 | |||
690 | |||
691 | .get_dev_name: ; 1 = Get device name |
||
692 | |||
693 | mov esi, [eax + NET_DEVICE.name] |
||
694 | mov edi, ecx |
||
695 | |||
696 | mov ecx, 64/4 ; max length |
||
697 | rep movsd |
||
698 | |||
699 | xor eax, eax |
||
700 | jmp .return |
||
701 | |||
702 | .reset: ; 2 = Reset the device |
||
703 | |||
704 | call [eax + NET_DEVICE.reset] |
||
705 | jmp .return |
||
706 | |||
707 | .stop: ; 3 = Stop driver for this device |
||
708 | |||
709 | call [eax + NET_DEVICE.unload] |
||
710 | jmp .return |
||
711 | |||
712 | |||
713 | .get_ptr: ; 4 = Get driver pointer |
||
714 | |||
715 | jmp .return |
||
716 | |||
717 | |||
718 | .get_drv_name: ; 5 = Get driver name |
||
719 | |||
720 | xor eax, eax |
||
721 | jmp .return |
||
722 | |||
723 | |||
724 | .set_default: ; 6 = Set default device |
||
725 | |||
726 | call NET_set_default |
||
727 | jmp .return |
||
728 | |||
729 | .doesnt_exist: |
||
730 | mov eax, -1 |
||
731 | |||
732 | .return: |
||
733 | mov [esp+32], eax |
||
734 | ret |
||
735 | |||
736 | |||
737 | ;---------------------------------------------------------------- |
||
738 | ; |
||
739 | ; System function to work with protocols (76) |
||
740 | ; |
||
741 | ;---------------------------------------------------------------- |
||
742 | align 4 |
||
743 | sys_protocols: |
||
744 | cmp bh, MAX_NET_DEVICES ; Check if device number exists |
||
745 | jae .doesnt_exist |
||
746 | |||
747 | mov esi, ebx |
||
748 | and esi, 0x0000ff00 |
||
749 | shr esi, 6 ; now we have the device num * 4 in esi |
||
750 | cmp [esi + NET_DRV_LIST], 0 ; check if driver is running |
||
751 | je .doesnt_exist |
||
752 | |||
753 | push .return ; return address (we will be using jumps instead of calls) |
||
754 | |||
755 | mov eax, ebx ; set ax to protocol number |
||
756 | shr eax, 16 ; |
||
757 | |||
758 | cmp ax, API_ETH |
||
759 | je ETH_api |
||
760 | |||
761 | cmp ax, API_IPv4 |
||
762 | je IPv4_api |
||
763 | |||
764 | cmp ax, API_ICMP |
||
765 | je ICMP_api |
||
766 | |||
767 | cmp ax, API_UDP |
||
768 | je UDP_api |
||
769 | |||
770 | cmp ax, API_TCP |
||
771 | je TCP_api |
||
772 | |||
773 | cmp ax, API_ARP |
||
774 | je ARP_api |
||
775 | |||
776 | cmp ax, API_PPPOE |
||
777 | je PPPoE_api |
||
778 | |||
779 | cmp ax, API_IPv6 |
||
780 | je IPv6_api |
||
781 | |||
782 | add esp, 4 ; if we reached here, no function was called, so we need to balance stack |
||
783 | |||
784 | .doesnt_exist: |
||
785 | mov eax, -1 |
||
786 | |||
787 | .return: |
||
788 | mov [esp+28+4], eax ; return eax value to the program |
||
789 | ret |