common/src/nx_ipv6_packet_receive.c (netxduo)

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

/**************************************************************************/ /* */ /* Copyright (c) Microsoft Corporation. All rights reserved. */ /* */ /* This software is licensed under the Microsoft Software License */ /* Terms for Microsoft Azure RTOS. Full text of the license can be */ /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ /* and in the root directory of this software. */ /* */ /**************************************************************************/ /**************************************************************************/ /**************************************************************************/ /** */ /** NetX Component */ /** */ /** Internet Protocol (IP) */ /** */ /**************************************************************************/ /**************************************************************************/ #define NX_SOURCE_CODE /* Include necessary system files. */ #include "nx_api.h" #include "nx_ip.h" #include "nx_packet.h" #include "nx_ipv6.h" #include "nx_icmpv6.h" #ifdef FEATURE_NX_IPV6 /**************************************************************************/ /* */ /* FUNCTION RELEASE */ /* */ /* _nx_ipv6_packet_receive PORTABLE C */ /* 6.1 */ /* AUTHOR */ /* */ /* Yuxin Zhou, Microsoft Corporation */ /* */ /* DESCRIPTION */ /* */ /* This function receives IPv6 packets from the nx_ip_packet_receive. */ /* The packet is either processed here or placed it in a deferred */ /* processing queue, depending on the complexity of the packet. */ /* */ /* INPUT */ /* */ /* ip_ptr Pointer to IP control block */ /* packet_ptr Pointer to packet received */ /* */ /* OUTPUT */ /* */ /* None */ /* */ /* CALLS */ /* */ /* _nx_packet_release Packet release function */ /* _nx_ip_dispatch_process The routine that examines */ /* other optional headers and */ /* upper layer protocols. */ /* */ /* CALLED BY */ /* */ /* Application I/O Driver */ /* */ /* RELEASE HISTORY */ /* */ /* DATE NAME DESCRIPTION */ /* */ /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */ /* 09-30-2020 Yuxin Zhou Modified comment(s), */ /* resulting in version 6.1 */ /* */ /**************************************************************************/ VOID _nx_ipv6_packet_receive(NX_IP *ip_ptr, NX_PACKET *packet_ptr) { UINT error; ULONG delta; UINT pkt_length; UCHAR next_header_type; NX_IPV6_HEADER *ip_header_ptr; NXD_IPV6_ADDRESS *interface_ipv6_address_next; NXD_IPV6_ADDRESS *incoming_address = NX_NULL; #ifndef NX_DISABLE_PACKET_CHAIN NX_PACKET *before_last_packet; NX_PACKET *last_packet; #endif /* NX_DISABLE_PACKET_CHAIN */ #ifdef NX_ENABLE_IPV6_MULTICAST INT i = 0; #endif /* NX_ENABLE_IPV6_MULTICAST */ /* Add debug information. */ NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr); /* Points to the base of IPv6 header. */ /*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */ ip_header_ptr = (NX_IPV6_HEADER *)packet_ptr -> nx_packet_prepend_ptr; /* Byte swap WORD 1 to obtain IPv6 payload length. */ NX_CHANGE_ULONG_ENDIAN(ip_header_ptr -> nx_ip_header_word_1); pkt_length = (UINT)((ip_header_ptr -> nx_ip_header_word_1 >> 16) + sizeof(NX_IPV6_HEADER)); /* Make sure the packet length field matches the payload length field in the IPv6 header. */ if (packet_ptr -> nx_packet_length != (ULONG)pkt_length) { /* Determine if the packet length is less than the size reported in the IP header. */ if (packet_ptr -> nx_packet_length < (ULONG)pkt_length) { /* The incoming packet has a wrong payload size. */ #ifndef NX_DISABLE_IP_INFO /* Increment the IP invalid packet error. */ ip_ptr -> nx_ip_invalid_packets++; /* Increment the IP receive packets dropped count. */ ip_ptr -> nx_ip_receive_packets_dropped++; #endif /* Release the packet! */ _nx_packet_release(packet_ptr); /* In all cases, receive processing is finished. Return to caller. */ return; } /* Calculate the difference in the length. */ delta = packet_ptr -> nx_packet_length - pkt_length; /* Adjust the packet length. */ packet_ptr -> nx_packet_length = packet_ptr -> nx_packet_length - delta; /* Adjust the append pointer. */ #ifndef NX_DISABLE_PACKET_CHAIN /* Loop to process adjustment that spans multiple packets. */ while (delta) { /* Determine if the packet is chained (or still chained after the adjustment). */ if (packet_ptr -> nx_packet_last == NX_NULL) { /* No, packet is not chained, simply adjust the append pointer in the packet. */ packet_ptr -> nx_packet_append_ptr = packet_ptr -> nx_packet_append_ptr - delta; /* Break out of the loop, since the adjustment is complete. */ break; } /* Pickup the pointer to the last packet. */ last_packet = packet_ptr -> nx_packet_last; /* Determine if the amount to adjust is less than the payload in the last packet. */ /*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */ if (((ULONG)(last_packet -> nx_packet_append_ptr - last_packet -> nx_packet_prepend_ptr)) > delta) { /* Yes, simply adjust the append pointer of the last packet in the chain. */ /*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */ last_packet -> nx_packet_append_ptr = last_packet -> nx_packet_append_ptr - delta; /* Get out of the loop, since the adjustment is complete. */ break; } else { /* Adjust the delta by the amount in the last packet. */ delta = delta - ((ULONG)(last_packet -> nx_packet_append_ptr - last_packet -> nx_packet_prepend_ptr)); /* Find the packet before the last packet. */ before_last_packet = packet_ptr; while (before_last_packet -> nx_packet_next != last_packet) { /* Move to the next packet in the chain. */ before_last_packet = before_last_packet -> nx_packet_next; } /* At this point, we need to release the last packet and adjust the other packet pointers. */ /* Ensure the next packet pointer is NULL in what is now the last packet. */ before_last_packet -> nx_packet_next = NX_NULL; /* Determine if the packet is still chained. */ if (packet_ptr != before_last_packet) { /* Yes, the packet is still chained, setup the last packet pointer. */ packet_ptr -> nx_packet_last = before_last_packet; } else { /* The packet is no longer chained, set the last packet pointer to NULL. */ packet_ptr -> nx_packet_last = NX_NULL; } /* Release the last packet. */ _nx_packet_release(last_packet); } } #else /* Simply adjust the append pointer in the packet. */ packet_ptr -> nx_packet_append_ptr = packet_ptr -> nx_packet_append_ptr - delta; #endif /* NX_DISABLE_PACKET_CHAIN */ } /* Byte swap the rest of the IPv6 header fields. */ NX_CHANGE_ULONG_ENDIAN(ip_header_ptr -> nx_ip_header_word_0); NX_IPV6_ADDRESS_CHANGE_ENDIAN(ip_header_ptr -> nx_ip_header_destination_ip); NX_IPV6_ADDRESS_CHANGE_ENDIAN(ip_header_ptr -> nx_ip_header_source_ip); /* Get a pointer to the first address in the address list for this interface (e.g. the interface the packet was received on). */ interface_ipv6_address_next = packet_ptr -> nx_packet_address.nx_packet_interface_ptr -> nxd_interface_ipv6_address_list_head; /* Check if this packet is intended for this host by looping through all the addresses in the IP interface table for a match. */ while (interface_ipv6_address_next) { /* Ignore invalid addresses. */ if (interface_ipv6_address_next -> nxd_ipv6_address_state != NX_IPV6_ADDR_STATE_UNKNOWN) { /* Does the incoming packet match one of the IP interfaces? */ if (CHECK_IPV6_ADDRESSES_SAME(ip_header_ptr -> nx_ip_header_destination_ip, interface_ipv6_address_next -> nxd_ipv6_address)) { /* Yes, we found a match! */ incoming_address = interface_ipv6_address_next; break; } /* Check for multicast address. */ else if (CHECK_IPV6_SOLICITED_NODE_MCAST_ADDRESS(ip_header_ptr -> nx_ip_header_destination_ip, interface_ipv6_address_next -> nxd_ipv6_address)) { /* Yes, this is a multicast address. */ incoming_address = interface_ipv6_address_next; break; } } /* No match yet, get the next address. */ interface_ipv6_address_next = interface_ipv6_address_next -> nxd_ipv6_address_next; } #ifdef NX_ENABLE_IPV6_MULTICAST if ((incoming_address == NX_NULL) && ((ip_header_ptr -> nx_ip_header_destination_ip[0] & 0xFF000000) == 0xFF000000)) { /* Search the address whether match our multicast join list. */ for (i = 0; i < NX_MAX_MULTICAST_GROUPS; i++) { /* Match the destination address with the multicast list */ if ((ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_interface_list == packet_ptr -> nx_packet_address.nx_packet_interface_ptr) && (CHECK_IPV6_ADDRESSES_SAME(ip_header_ptr -> nx_ip_header_destination_ip, (ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_list)))) { incoming_address = ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_interface_list -> nxd_interface_ipv6_address_list_head; break; } } } #endif /* NX_ENABLE_IPV6_MULTICAST */ /* Check for valid interface. */ if (incoming_address == NX_NULL) { /* The incoming packet has a destination address that does not match any of the local interface addresses so its not for me. */ #ifndef NX_DISABLE_IP_INFO /* Increment the IP receive packets dropped count. */ ip_ptr -> nx_ip_receive_packets_dropped++; #endif /* Release the packet. */ _nx_packet_release(packet_ptr); /* In all cases, receive processing is finished. Return to caller. */ return; } /* Set the matching address to the packet address. */ packet_ptr -> nx_packet_address.nx_packet_ipv6_address_ptr = incoming_address; /* Update the IP header pointer, packet length and packet prepend pointer to point to the next header (either IP option header or upper layer protocol header. */ packet_ptr -> nx_packet_prepend_ptr += sizeof(NX_IPV6_HEADER); packet_ptr -> nx_packet_length -= (ULONG)sizeof(NX_IPV6_HEADER); packet_ptr -> nx_packet_option_offset = 6; next_header_type = (UCHAR)((ip_header_ptr -> nx_ip_header_word_1 >> 8) & 0xFF); /* Search all the extension headers, terminate after upper layer protocols (such as UDP, TCP, ICMP). Also check the order of the optional headers. Once an out-of-order option field is detected, the search is terminated and an ICMPv6 error message is generated. */ /* Initialize start of search for just passed the IP header. */ packet_ptr -> nx_packet_option_state = (UCHAR)IPV6_BASE_HEADER; packet_ptr -> nx_packet_destination_header = 0; #ifndef NX_DISABLE_IP_INFO /* Increment the number of packets delivered. */ ip_ptr -> nx_ip_total_packets_delivered++; /* Increment the IP packet bytes received (not including the header). */ ip_ptr -> nx_ip_total_bytes_received += packet_ptr -> nx_packet_length; #endif error = _nx_ip_dispatch_process(ip_ptr, packet_ptr, next_header_type); if (error) { _nx_packet_release(packet_ptr); } return; } #endif /* FEATURE_NX_IPV6 */