Changeset 60b2b69 in mainline for uspace/srv/net/il/arp/arp.c
- Timestamp:
- 2011-01-14T13:04:10Z (14 years ago)
- Branches:
- lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export
- Children:
- 5f635ca
- Parents:
- 5ccb15c (diff), 00c2d035 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the(diff)links above to see all the changes relative to each parent. - File:
-
- 1 edited
-
uspace/srv/net/il/arp/arp.c (modified) (23 diffs)
Legend:
- Unmodified
- Added
- Removed
-
uspace/srv/net/il/arp/arp.c
r5ccb15c r60b2b69 36 36 */ 37 37 38 #include "arp.h"39 #include "arp_header.h"40 #include "arp_oc.h"41 #include "arp_module.h"42 43 38 #include <async.h> 44 39 #include <malloc.h> 45 40 #include <mem.h> 46 41 #include <fibril_synch.h> 42 #include <assert.h> 47 43 #include <stdio.h> 48 44 #include <str.h> … … 54 50 #include <ipc/arp.h> 55 51 #include <ipc/il.h> 52 #include <ipc/nil.h> 56 53 #include <byteorder.h> 57 54 #include <errno.h> 58 59 55 #include <net/modules.h> 60 56 #include <net/device.h> 61 57 #include <net/packet.h> 62 63 #include <nil_interface.h> 58 #include <nil_remote.h> 64 59 #include <protocol_map.h> 65 60 #include <packet_client.h> 66 61 #include <packet_remote.h> 67 #include <il_ interface.h>68 #include <il_ local.h>69 62 #include <il_remote.h> 63 #include <il_skel.h> 64 #include "arp.h" 70 65 71 66 /** ARP module name. */ … … 73 68 74 69 /** Number of microseconds to wait for an ARP reply. */ 75 #define ARP_TRANS_WAIT 1000000 70 #define ARP_TRANS_WAIT 1000000 71 72 /** @name ARP operation codes definitions */ 73 /*@{*/ 74 75 /** REQUEST operation code. */ 76 #define ARPOP_REQUEST 1 77 78 /** REPLY operation code. */ 79 #define ARPOP_REPLY 2 80 81 /*@}*/ 82 83 /** Type definition of an ARP protocol header. 84 * @see arp_header 85 */ 86 typedef struct arp_header arp_header_t; 87 88 /** ARP protocol header. */ 89 struct arp_header { 90 /** 91 * Hardware type identifier. 92 * @see hardware.h 93 */ 94 uint16_t hardware; 95 96 /** Protocol identifier. */ 97 uint16_t protocol; 98 /** Hardware address length in bytes. */ 99 uint8_t hardware_length; 100 /** Protocol address length in bytes. */ 101 uint8_t protocol_length; 102 103 /** 104 * ARP packet type. 105 * @see arp_oc.h 106 */ 107 uint16_t operation; 108 } __attribute__ ((packed)); 76 109 77 110 /** ARP global data. */ … … 88 121 trans->hw_addr = NULL; 89 122 } 123 90 124 fibril_condvar_broadcast(&trans->cv); 91 125 } … … 94 128 { 95 129 int count; 96 arp_trans_t *trans; 97 130 98 131 for (count = arp_addr_count(addresses) - 1; count >= 0; count--) { 99 trans = arp_addr_items_get_index(&addresses->values, count); 132 arp_trans_t *trans = arp_addr_items_get_index(&addresses->values, 133 count); 100 134 if (trans) 101 135 arp_clear_trans(trans); … … 103 137 } 104 138 105 106 /** Clears the device specific data. 107 * 108 * @param[in] device The device specific data. 139 /** Clear the device specific data. 140 * 141 * @param[in] device Device specific data. 109 142 */ 110 143 static void arp_clear_device(arp_device_t *device) 111 144 { 112 145 int count; 113 arp_proto_t *proto; 114 146 115 147 for (count = arp_protos_count(&device->protos) - 1; count >= 0; 116 148 count--) { 117 proto = arp_protos_get_index(&device->protos, count); 149 arp_proto_t *proto = arp_protos_get_index(&device->protos, 150 count); 151 118 152 if (proto) { 119 153 if (proto->addr) 120 154 free(proto->addr); 155 121 156 if (proto->addr_data) 122 157 free(proto->addr_data); 158 123 159 arp_clear_addr(&proto->addresses); 124 160 arp_addr_destroy(&proto->addresses); 125 161 } 126 162 } 163 127 164 arp_protos_clear(&device->protos); 128 165 } … … 131 168 { 132 169 int count; 133 arp_device_t *device; 134 170 135 171 fibril_mutex_lock(&arp_globals.lock); 136 172 for (count = arp_cache_count(&arp_globals.cache) - 1; count >= 0; 137 173 count--) { 138 device = arp_cache_get_index(&arp_globals.cache, count); 174 arp_device_t *device = arp_cache_get_index(&arp_globals.cache, 175 count); 176 139 177 if (device) { 140 178 arp_clear_device(device); 141 179 if (device->addr_data) 142 180 free(device->addr_data); 181 143 182 if (device->broadcast_data) 144 183 free(device->broadcast_data); 145 184 } 146 185 } 186 147 187 arp_cache_clear(&arp_globals.cache); 148 188 fibril_mutex_unlock(&arp_globals.lock); 149 printf("Cache cleaned\n");189 150 190 return EOK; 151 191 } … … 154 194 services_t protocol, measured_string_t *address) 155 195 { 156 arp_device_t *device;157 arp_proto_t *proto;158 arp_trans_t *trans;159 160 196 fibril_mutex_lock(&arp_globals.lock); 161 device = arp_cache_find(&arp_globals.cache, device_id); 197 198 arp_device_t *device = arp_cache_find(&arp_globals.cache, device_id); 162 199 if (!device) { 163 200 fibril_mutex_unlock(&arp_globals.lock); 164 201 return ENOENT; 165 202 } 166 proto = arp_protos_find(&device->protos, protocol); 203 204 arp_proto_t *proto = arp_protos_find(&device->protos, protocol); 167 205 if (!proto) { 168 206 fibril_mutex_unlock(&arp_globals.lock); 169 207 return ENOENT; 170 208 } 171 trans = arp_addr_find(&proto->addresses, address->value, address->length); 209 210 arp_trans_t *trans = arp_addr_find(&proto->addresses, address->value, 211 address->length); 172 212 if (trans) 173 213 arp_clear_trans(trans); 214 174 215 arp_addr_exclude(&proto->addresses, address->value, address->length); 216 175 217 fibril_mutex_unlock(&arp_globals.lock); 176 218 return EOK; 177 219 } 178 220 179 180 221 static int arp_clear_device_req(int arp_phone, device_id_t device_id) 181 222 { 182 arp_device_t *device;183 184 223 fibril_mutex_lock(&arp_globals.lock); 185 device = arp_cache_find(&arp_globals.cache, device_id); 224 225 arp_device_t *device = arp_cache_find(&arp_globals.cache, device_id); 186 226 if (!device) { 187 227 fibril_mutex_unlock(&arp_globals.lock); 188 228 return ENOENT; 189 229 } 230 190 231 arp_clear_device(device); 191 printf("Device %d cleared\n", device_id);232 192 233 fibril_mutex_unlock(&arp_globals.lock); 193 234 return EOK; 194 235 } 195 236 196 /** Creates new protocol specific data. 197 * 198 * Allocates and returns the needed memory block as the proto parameter. 199 * 200 * @param[out] proto The allocated protocol specific data. 201 * @param[in] service The protocol module service. 202 * @param[in] address The actual protocol device address. 203 * @return EOK on success. 204 * @return ENOMEM if there is not enough memory left. 237 /** Create new protocol specific data. 238 * 239 * Allocate and return the needed memory block as the proto parameter. 240 * 241 * @param[out] proto Allocated protocol specific data. 242 * @param[in] service Protocol module service. 243 * @param[in] address Actual protocol device address. 244 * 245 * @return EOK on success. 246 * @return ENOMEM if there is not enough memory left. 247 * 205 248 */ 206 249 static int arp_proto_create(arp_proto_t **proto, services_t service, 207 250 measured_string_t *address) 208 251 { 209 int rc;210 211 252 *proto = (arp_proto_t *) malloc(sizeof(arp_proto_t)); 212 253 if (!*proto) … … 217 258 (*proto)->addr_data = address->value; 218 259 219 rc = arp_addr_initialize(&(*proto)->addresses);260 int rc = arp_addr_initialize(&(*proto)->addresses); 220 261 if (rc != EOK) { 221 262 free(*proto); … … 226 267 } 227 268 228 /** Registers the device. 229 * 230 * Creates new device entry in the cache or updates the protocol address if the 231 * device with the device identifier and the driver service exists. 232 * 233 * @param[in] device_id The device identifier. 234 * @param[in] service The device driver service. 235 * @param[in] protocol The protocol service. 236 * @param[in] address The actual device protocol address. 237 * @return EOK on success. 238 * @return EEXIST if another device with the same device identifier 239 * and different driver service exists. 240 * @return ENOMEM if there is not enough memory left. 241 * @return Other error codes as defined for the 242 * measured_strings_return() function. 243 */ 244 static int arp_device_message(device_id_t device_id, services_t service, 245 services_t protocol, measured_string_t *address) 246 { 247 arp_device_t *device; 248 arp_proto_t *proto; 249 hw_type_t hardware; 250 int index; 269 /** Process the received ARP packet. 270 * 271 * Update the source hardware address if the source entry exists or the packet 272 * is targeted to my protocol address. 273 * 274 * Respond to the ARP request if the packet is the ARP request and is 275 * targeted to my address. 276 * 277 * @param[in] device_id Source device identifier. 278 * @param[in,out] packet Received packet. 279 * 280 * @return EOK on success and the packet is no longer needed. 281 * @return One on success and the packet has been reused. 282 * @return EINVAL if the packet is too small to carry an ARP 283 * packet. 284 * @return EINVAL if the received address lengths differs from 285 * the registered values. 286 * @return ENOENT if the device is not found in the cache. 287 * @return ENOENT if the protocol for the device is not found in 288 * the cache. 289 * @return ENOMEM if there is not enough memory left. 290 * 291 */ 292 static int arp_receive_message(device_id_t device_id, packet_t *packet) 293 { 251 294 int rc; 252 253 fibril_mutex_lock(&arp_globals.lock); 254 255 /* An existing device? */ 256 device = arp_cache_find(&arp_globals.cache, device_id); 257 258 if (device) { 259 if (device->service != service) { 260 printf("Device %d already exists\n", device->device_id); 261 fibril_mutex_unlock(&arp_globals.lock); 262 return EEXIST; 263 } 264 proto = arp_protos_find(&device->protos, protocol); 265 if (proto) { 266 free(proto->addr); 267 free(proto->addr_data); 268 proto->addr = address; 269 proto->addr_data = address->value; 270 } else { 271 rc = arp_proto_create(&proto, protocol, address); 272 if (rc != EOK) { 273 fibril_mutex_unlock(&arp_globals.lock); 274 return rc; 275 } 276 index = arp_protos_add(&device->protos, proto->service, 277 proto); 278 if (index < 0) { 279 fibril_mutex_unlock(&arp_globals.lock); 280 free(proto); 281 return index; 282 } 283 printf("New protocol added:\n\tdevice id\t= " 284 "%d\n\tproto\t= %d", device_id, protocol); 285 } 286 } else { 287 hardware = hardware_map(service); 288 if (!hardware) 289 return ENOENT; 290 291 /* Create a new device */ 292 device = (arp_device_t *) malloc(sizeof(arp_device_t)); 293 if (!device) { 294 fibril_mutex_unlock(&arp_globals.lock); 295 return ENOMEM; 296 } 297 device->hardware = hardware; 298 device->device_id = device_id; 299 rc = arp_protos_initialize(&device->protos); 300 if (rc != EOK) { 301 fibril_mutex_unlock(&arp_globals.lock); 302 free(device); 303 return rc; 304 } 305 rc = arp_proto_create(&proto, protocol, address); 306 if (rc != EOK) { 307 fibril_mutex_unlock(&arp_globals.lock); 308 free(device); 309 return rc; 310 } 311 index = arp_protos_add(&device->protos, proto->service, proto); 312 if (index < 0) { 313 fibril_mutex_unlock(&arp_globals.lock); 314 arp_protos_destroy(&device->protos); 315 free(device); 316 return index; 317 } 318 device->service = service; 319 320 /* Bind the new one */ 321 device->phone = nil_bind_service(device->service, 322 (sysarg_t) device->device_id, SERVICE_ARP, 323 arp_globals.client_connection); 324 if (device->phone < 0) { 325 fibril_mutex_unlock(&arp_globals.lock); 326 arp_protos_destroy(&device->protos); 327 free(device); 328 return EREFUSED; 329 } 330 331 /* Get packet dimensions */ 332 rc = nil_packet_size_req(device->phone, device_id, 333 &device->packet_dimension); 334 if (rc != EOK) { 335 fibril_mutex_unlock(&arp_globals.lock); 336 arp_protos_destroy(&device->protos); 337 free(device); 338 return rc; 339 } 340 341 /* Get hardware address */ 342 rc = nil_get_addr_req(device->phone, device_id, &device->addr, 343 &device->addr_data); 344 if (rc != EOK) { 345 fibril_mutex_unlock(&arp_globals.lock); 346 arp_protos_destroy(&device->protos); 347 free(device); 348 return rc; 349 } 350 351 /* Get broadcast address */ 352 rc = nil_get_broadcast_addr_req(device->phone, device_id, 353 &device->broadcast_addr, &device->broadcast_data); 354 if (rc != EOK) { 355 fibril_mutex_unlock(&arp_globals.lock); 356 free(device->addr); 357 free(device->addr_data); 358 arp_protos_destroy(&device->protos); 359 free(device); 360 return rc; 361 } 362 363 rc = arp_cache_add(&arp_globals.cache, device->device_id, 364 device); 365 if (rc != EOK) { 366 fibril_mutex_unlock(&arp_globals.lock); 367 free(device->addr); 368 free(device->addr_data); 369 free(device->broadcast_addr); 370 free(device->broadcast_data); 371 arp_protos_destroy(&device->protos); 372 free(device); 373 return rc; 374 } 375 printf("%s: Device registered (id: %d, type: 0x%x, service: %d," 376 " proto: %d)\n", NAME, device->device_id, device->hardware, 377 device->service, protocol); 378 } 379 fibril_mutex_unlock(&arp_globals.lock); 380 381 return EOK; 382 } 383 384 /** Initializes the ARP module. 385 * 386 * @param[in] client_connection The client connection processing function. 387 * The module skeleton propagates its own one. 388 * @return EOK on success. 389 * @return ENOMEM if there is not enough memory left. 390 */ 391 int arp_initialize(async_client_conn_t client_connection) 392 { 393 int rc; 394 395 fibril_mutex_initialize(&arp_globals.lock); 396 fibril_mutex_lock(&arp_globals.lock); 397 arp_globals.client_connection = client_connection; 398 rc = arp_cache_initialize(&arp_globals.cache); 399 fibril_mutex_unlock(&arp_globals.lock); 400 401 return rc; 402 } 403 404 /** Updates the device content length according to the new MTU value. 405 * 406 * @param[in] device_id The device identifier. 407 * @param[in] mtu The new mtu value. 408 * @return ENOENT if device is not found. 409 * @return EOK on success. 410 */ 411 static int arp_mtu_changed_message(device_id_t device_id, size_t mtu) 412 { 413 arp_device_t *device; 414 415 fibril_mutex_lock(&arp_globals.lock); 416 device = arp_cache_find(&arp_globals.cache, device_id); 417 if (!device) { 418 fibril_mutex_unlock(&arp_globals.lock); 419 return ENOENT; 420 } 421 device->packet_dimension.content = mtu; 422 fibril_mutex_unlock(&arp_globals.lock); 423 printf("arp - device %d changed mtu to %zu\n\n", device_id, mtu); 424 return EOK; 425 } 426 427 /** Processes the received ARP packet. 428 * 429 * Updates the source hardware address if the source entry exists or the packet 430 * is targeted to my protocol address. 431 * Responses to the ARP request if the packet is the ARP request and is 432 * targeted to my address. 433 * 434 * @param[in] device_id The source device identifier. 435 * @param[in,out] packet The received packet. 436 * @return EOK on success and the packet is no longer needed. 437 * @return One on success and the packet has been reused. 438 * @return EINVAL if the packet is too small to carry an ARP 439 * packet. 440 * @return EINVAL if the received address lengths differs from 441 * the registered values. 442 * @return ENOENT if the device is not found in the cache. 443 * @return ENOENT if the protocol for the device is not found in 444 * the cache. 445 * @return ENOMEM if there is not enough memory left. 446 */ 447 static int arp_receive_message(device_id_t device_id, packet_t *packet) 448 { 449 size_t length; 450 arp_header_t *header; 451 arp_device_t *device; 452 arp_proto_t *proto; 453 arp_trans_t *trans; 454 uint8_t *src_hw; 455 uint8_t *src_proto; 456 uint8_t *des_hw; 457 uint8_t *des_proto; 458 int rc; 459 460 length = packet_get_data_length(packet); 295 296 size_t length = packet_get_data_length(packet); 461 297 if (length <= sizeof(arp_header_t)) 462 298 return EINVAL; 463 464 device = arp_cache_find(&arp_globals.cache, device_id);299 300 arp_device_t *device = arp_cache_find(&arp_globals.cache, device_id); 465 301 if (!device) 466 302 return ENOENT; 467 468 header = (arp_header_t *) packet_get_data(packet);303 304 arp_header_t *header = (arp_header_t *) packet_get_data(packet); 469 305 if ((ntohs(header->hardware) != device->hardware) || 470 306 (length < sizeof(arp_header_t) + header->hardware_length * 2U + … … 472 308 return EINVAL; 473 309 } 474 475 proto = arp_protos_find(&device->protos,310 311 arp_proto_t *proto = arp_protos_find(&device->protos, 476 312 protocol_unmap(device->service, ntohs(header->protocol))); 477 313 if (!proto) 478 314 return ENOENT; 479 480 src_hw = ((uint8_t *) header) + sizeof(arp_header_t); 481 src_proto = src_hw + header->hardware_length; 482 des_hw = src_proto + header->protocol_length; 483 des_proto = des_hw + header->hardware_length; 484 trans = arp_addr_find(&proto->addresses, src_proto, 315 316 uint8_t *src_hw = ((uint8_t *) header) + sizeof(arp_header_t); 317 uint8_t *src_proto = src_hw + header->hardware_length; 318 uint8_t *des_hw = src_proto + header->protocol_length; 319 uint8_t *des_proto = des_hw + header->hardware_length; 320 321 arp_trans_t *trans = arp_addr_find(&proto->addresses, src_proto, 485 322 header->protocol_length); 486 /* Exists? */ 487 if (trans && trans->hw_addr) { 323 324 if ((trans) && (trans->hw_addr)) { 325 /* Translation exists */ 488 326 if (trans->hw_addr->length != header->hardware_length) 489 327 return EINVAL; 328 490 329 memcpy(trans->hw_addr->value, src_hw, trans->hw_addr->length); 491 330 } 331 492 332 /* Is my protocol address? */ 493 333 if (proto->addr->length != header->protocol_length) … … 495 335 496 336 if (!bcmp(proto->addr->value, des_proto, proto->addr->length)) { 497 /* Not already updated? */498 337 if (!trans) { 338 /* Update the translation */ 499 339 trans = (arp_trans_t *) malloc(sizeof(arp_trans_t)); 500 340 if (!trans) 501 341 return ENOMEM; 342 502 343 trans->hw_addr = NULL; 503 344 fibril_condvar_initialize(&trans->cv); … … 509 350 } 510 351 } 352 511 353 if (!trans->hw_addr) { 512 354 trans->hw_addr = measured_string_create_bulk(src_hw, … … 518 360 fibril_condvar_broadcast(&trans->cv); 519 361 } 362 520 363 if (ntohs(header->operation) == ARPOP_REQUEST) { 521 364 header->operation = htons(ARPOP_REPLY); … … 538 381 } 539 382 } 540 383 541 384 return EOK; 542 385 } 543 386 544 545 /** Returns the hardware address for the given protocol address. 546 * 547 * Sends the ARP request packet if the hardware address is not found in the 548 * cache. 549 * 550 * @param[in] device_id The device identifier. 551 * @param[in] protocol The protocol service. 552 * @param[in] target The target protocol address. 553 * @param[out] translation Where the hardware address of the target is stored. 554 * @return EOK on success. 555 * @return EAGAIN if the caller should try again. 556 * @return Other error codes in case of error. 557 */ 558 static int 559 arp_translate_message(device_id_t device_id, services_t protocol, 560 measured_string_t *target, measured_string_t **translation) 561 { 562 arp_device_t *device; 563 arp_proto_t *proto; 564 arp_trans_t *trans; 565 size_t length; 387 /** Update the device content length according to the new MTU value. 388 * 389 * @param[in] device_id Device identifier. 390 * @param[in] mtu New MTU value. 391 * 392 * @return ENOENT if device is not found. 393 * @return EOK on success. 394 * 395 */ 396 static int arp_mtu_changed_message(device_id_t device_id, size_t mtu) 397 { 398 fibril_mutex_lock(&arp_globals.lock); 399 400 arp_device_t *device = arp_cache_find(&arp_globals.cache, device_id); 401 if (!device) { 402 fibril_mutex_unlock(&arp_globals.lock); 403 return ENOENT; 404 } 405 406 device->packet_dimension.content = mtu; 407 408 fibril_mutex_unlock(&arp_globals.lock); 409 410 printf("%s: Device %d changed MTU to %zu\n", NAME, device_id, mtu); 411 412 return EOK; 413 } 414 415 /** Process IPC messages from the registered device driver modules 416 * 417 * @param[in] iid Message identifier. 418 * @param[in,out] icall Message parameters. 419 * 420 */ 421 static void arp_receiver(ipc_callid_t iid, ipc_call_t *icall) 422 { 566 423 packet_t *packet; 567 arp_header_t *header;568 bool retry = false;569 424 int rc; 570 571 restart: 572 if (!target || !translation) 573 return EBADMEM; 574 575 device = arp_cache_find(&arp_globals.cache, device_id); 576 if (!device) 577 return ENOENT; 578 579 proto = arp_protos_find(&device->protos, protocol); 580 if (!proto || (proto->addr->length != target->length)) 581 return ENOENT; 582 583 trans = arp_addr_find(&proto->addresses, target->value, target->length); 584 if (trans) { 585 if (trans->hw_addr) { 586 *translation = trans->hw_addr; 587 return EOK; 588 } 589 if (retry) 590 return EAGAIN; 591 rc = fibril_condvar_wait_timeout(&trans->cv, &arp_globals.lock, 592 ARP_TRANS_WAIT); 593 if (rc == ETIMEOUT) 425 426 while (true) { 427 switch (IPC_GET_IMETHOD(*icall)) { 428 case NET_IL_DEVICE_STATE: 429 /* Do nothing - keep the cache */ 430 ipc_answer_0(iid, (sysarg_t) EOK); 431 break; 432 433 case NET_IL_RECEIVED: 434 rc = packet_translate_remote(arp_globals.net_phone, &packet, 435 IPC_GET_PACKET(*icall)); 436 if (rc == EOK) { 437 fibril_mutex_lock(&arp_globals.lock); 438 do { 439 packet_t *next = pq_detach(packet); 440 rc = arp_receive_message(IPC_GET_DEVICE(*icall), packet); 441 if (rc != 1) { 442 pq_release_remote(arp_globals.net_phone, 443 packet_get_id(packet)); 444 } 445 446 packet = next; 447 } while (packet); 448 fibril_mutex_unlock(&arp_globals.lock); 449 } 450 ipc_answer_0(iid, (sysarg_t) rc); 451 break; 452 453 case NET_IL_MTU_CHANGED: 454 rc = arp_mtu_changed_message(IPC_GET_DEVICE(*icall), 455 IPC_GET_MTU(*icall)); 456 ipc_answer_0(iid, (sysarg_t) rc); 457 break; 458 459 default: 460 ipc_answer_0(iid, (sysarg_t) ENOTSUP); 461 } 462 463 iid = async_get_call(icall); 464 } 465 } 466 467 /** Register the device. 468 * 469 * Create new device entry in the cache or update the protocol address if the 470 * device with the device identifier and the driver service exists. 471 * 472 * @param[in] device_id Device identifier. 473 * @param[in] service Device driver service. 474 * @param[in] protocol Protocol service. 475 * @param[in] address Actual device protocol address. 476 * 477 * @return EOK on success. 478 * @return EEXIST if another device with the same device identifier 479 * and different driver service exists. 480 * @return ENOMEM if there is not enough memory left. 481 * @return Other error codes as defined for the 482 * measured_strings_return() function. 483 * 484 */ 485 static int arp_device_message(device_id_t device_id, services_t service, 486 services_t protocol, measured_string_t *address) 487 { 488 int index; 489 int rc; 490 491 fibril_mutex_lock(&arp_globals.lock); 492 493 /* An existing device? */ 494 arp_device_t *device = arp_cache_find(&arp_globals.cache, device_id); 495 if (device) { 496 if (device->service != service) { 497 printf("%s: Device %d already exists\n", NAME, 498 device->device_id); 499 fibril_mutex_unlock(&arp_globals.lock); 500 return EEXIST; 501 } 502 503 arp_proto_t *proto = arp_protos_find(&device->protos, protocol); 504 if (proto) { 505 free(proto->addr); 506 free(proto->addr_data); 507 proto->addr = address; 508 proto->addr_data = address->value; 509 } else { 510 rc = arp_proto_create(&proto, protocol, address); 511 if (rc != EOK) { 512 fibril_mutex_unlock(&arp_globals.lock); 513 return rc; 514 } 515 516 index = arp_protos_add(&device->protos, proto->service, 517 proto); 518 if (index < 0) { 519 fibril_mutex_unlock(&arp_globals.lock); 520 free(proto); 521 return index; 522 } 523 524 printf("%s: New protocol added (id: %d, proto: %d)\n", NAME, 525 device_id, protocol); 526 } 527 } else { 528 hw_type_t hardware = hardware_map(service); 529 if (!hardware) 594 530 return ENOENT; 595 retry = true; 596 goto restart; 597 } 598 if (retry) 599 return EAGAIN; 600 531 532 /* Create new device */ 533 device = (arp_device_t *) malloc(sizeof(arp_device_t)); 534 if (!device) { 535 fibril_mutex_unlock(&arp_globals.lock); 536 return ENOMEM; 537 } 538 539 device->hardware = hardware; 540 device->device_id = device_id; 541 rc = arp_protos_initialize(&device->protos); 542 if (rc != EOK) { 543 fibril_mutex_unlock(&arp_globals.lock); 544 free(device); 545 return rc; 546 } 547 548 arp_proto_t *proto; 549 rc = arp_proto_create(&proto, protocol, address); 550 if (rc != EOK) { 551 fibril_mutex_unlock(&arp_globals.lock); 552 free(device); 553 return rc; 554 } 555 556 index = arp_protos_add(&device->protos, proto->service, proto); 557 if (index < 0) { 558 fibril_mutex_unlock(&arp_globals.lock); 559 arp_protos_destroy(&device->protos); 560 free(device); 561 return index; 562 } 563 564 device->service = service; 565 566 /* Bind */ 567 device->phone = nil_bind_service(device->service, 568 (sysarg_t) device->device_id, SERVICE_ARP, 569 arp_receiver); 570 if (device->phone < 0) { 571 fibril_mutex_unlock(&arp_globals.lock); 572 arp_protos_destroy(&device->protos); 573 free(device); 574 return EREFUSED; 575 } 576 577 /* Get packet dimensions */ 578 rc = nil_packet_size_req(device->phone, device_id, 579 &device->packet_dimension); 580 if (rc != EOK) { 581 fibril_mutex_unlock(&arp_globals.lock); 582 arp_protos_destroy(&device->protos); 583 free(device); 584 return rc; 585 } 586 587 /* Get hardware address */ 588 rc = nil_get_addr_req(device->phone, device_id, &device->addr, 589 &device->addr_data); 590 if (rc != EOK) { 591 fibril_mutex_unlock(&arp_globals.lock); 592 arp_protos_destroy(&device->protos); 593 free(device); 594 return rc; 595 } 596 597 /* Get broadcast address */ 598 rc = nil_get_broadcast_addr_req(device->phone, device_id, 599 &device->broadcast_addr, &device->broadcast_data); 600 if (rc != EOK) { 601 fibril_mutex_unlock(&arp_globals.lock); 602 free(device->addr); 603 free(device->addr_data); 604 arp_protos_destroy(&device->protos); 605 free(device); 606 return rc; 607 } 608 609 rc = arp_cache_add(&arp_globals.cache, device->device_id, 610 device); 611 if (rc != EOK) { 612 fibril_mutex_unlock(&arp_globals.lock); 613 free(device->addr); 614 free(device->addr_data); 615 free(device->broadcast_addr); 616 free(device->broadcast_data); 617 arp_protos_destroy(&device->protos); 618 free(device); 619 return rc; 620 } 621 printf("%s: Device registered (id: %d, type: 0x%x, service: %d," 622 " proto: %d)\n", NAME, device->device_id, device->hardware, 623 device->service, protocol); 624 } 625 626 fibril_mutex_unlock(&arp_globals.lock); 627 return EOK; 628 } 629 630 int il_initialize(int net_phone) 631 { 632 fibril_mutex_initialize(&arp_globals.lock); 633 634 fibril_mutex_lock(&arp_globals.lock); 635 arp_globals.net_phone = net_phone; 636 int rc = arp_cache_initialize(&arp_globals.cache); 637 fibril_mutex_unlock(&arp_globals.lock); 638 639 return rc; 640 } 641 642 static int arp_send_request(device_id_t device_id, services_t protocol, 643 measured_string_t *target, arp_device_t *device, arp_proto_t *proto) 644 { 601 645 /* ARP packet content size = header + (address + translation) * 2 */ 602 length = 8 + 2 * (proto->addr->length + device->addr->length);646 size_t length = 8 + 2 * (proto->addr->length + device->addr->length); 603 647 if (length > device->packet_dimension.content) 604 648 return ELIMIT; 605 606 packet = packet_get_4_remote(arp_globals.net_phone,649 650 packet_t *packet = packet_get_4_remote(arp_globals.net_phone, 607 651 device->packet_dimension.addr_len, device->packet_dimension.prefix, 608 652 length, device->packet_dimension.suffix); 609 653 if (!packet) 610 654 return ENOMEM; 611 612 header = (arp_header_t *) packet_suffix(packet, length);655 656 arp_header_t *header = (arp_header_t *) packet_suffix(packet, length); 613 657 if (!header) { 614 658 pq_release_remote(arp_globals.net_phone, packet_get_id(packet)); 615 659 return ENOMEM; 616 660 } 617 661 618 662 header->hardware = htons(device->hardware); 619 663 header->hardware_length = (uint8_t) device->addr->length; … … 621 665 header->protocol_length = (uint8_t) proto->addr->length; 622 666 header->operation = htons(ARPOP_REQUEST); 667 623 668 length = sizeof(arp_header_t); 669 624 670 memcpy(((uint8_t *) header) + length, device->addr->value, 625 671 device->addr->length); … … 631 677 length += device->addr->length; 632 678 memcpy(((uint8_t *) header) + length, target->value, target->length); 633 634 rc = packet_set_addr(packet, (uint8_t *) device->addr->value,679 680 int rc = packet_set_addr(packet, (uint8_t *) device->addr->value, 635 681 (uint8_t *) device->broadcast_addr->value, device->addr->length); 636 682 if (rc != EOK) { … … 638 684 return rc; 639 685 } 640 686 641 687 nil_send_msg(device->phone, device_id, packet, SERVICE_ARP); 642 688 return EOK; 689 } 690 691 /** Return the hardware address for the given protocol address. 692 * 693 * Send the ARP request packet if the hardware address is not found in the 694 * cache. 695 * 696 * @param[in] device_id Device identifier. 697 * @param[in] protocol Protocol service. 698 * @param[in] target Target protocol address. 699 * @param[out] translation Where the hardware address of the target is stored. 700 * 701 * @return EOK on success. 702 * @return EAGAIN if the caller should try again. 703 * @return Other error codes in case of error. 704 * 705 */ 706 static int arp_translate_message(device_id_t device_id, services_t protocol, 707 measured_string_t *target, measured_string_t **translation) 708 { 709 bool retry = false; 710 int rc; 711 712 assert(fibril_mutex_is_locked(&arp_globals.lock)); 713 714 restart: 715 if ((!target) || (!translation)) 716 return EBADMEM; 717 718 arp_device_t *device = arp_cache_find(&arp_globals.cache, device_id); 719 if (!device) 720 return ENOENT; 721 722 arp_proto_t *proto = arp_protos_find(&device->protos, protocol); 723 if ((!proto) || (proto->addr->length != target->length)) 724 return ENOENT; 725 726 arp_trans_t *trans = arp_addr_find(&proto->addresses, target->value, 727 target->length); 728 if (trans) { 729 if (trans->hw_addr) { 730 /* The translation is in place. */ 731 *translation = trans->hw_addr; 732 return EOK; 733 } 734 735 if (retry) { 736 /* 737 * We may get here as a result of being signalled for 738 * some reason while waiting for the translation (e.g. 739 * translation becoming available, record being removed 740 * from the table) and then losing the race for 741 * the arp_globals.lock with someone else who modified 742 * the table. 743 * 744 * Remove the incomplete record so that it is possible 745 * to make new ARP requests. 746 */ 747 arp_clear_trans(trans); 748 arp_addr_exclude(&proto->addresses, target->value, 749 target->length); 750 return EAGAIN; 751 } 752 753 /* 754 * We are a random passer-by who merely joins an already waiting 755 * fibril in waiting for the translation. 756 */ 757 rc = fibril_condvar_wait_timeout(&trans->cv, &arp_globals.lock, 758 ARP_TRANS_WAIT); 759 if (rc == ETIMEOUT) 760 return ENOENT; 761 762 /* 763 * Need to recheck because we did not hold the lock while 764 * sleeping on the condition variable. 765 */ 766 retry = true; 767 goto restart; 768 } 769 770 if (retry) 771 return EAGAIN; 772 773 /* 774 * We are under the protection of arp_globals.lock, so we can afford to 775 * first send the ARP request and then insert an incomplete ARP record. 776 * The incomplete record is used to tell any other potential waiter 777 * that this fibril has already sent the request and that it is waiting 778 * for the answer. Lastly, any fibril which sees the incomplete request 779 * can perform a timed wait on its condition variable to wait for the 780 * ARP reply to arrive. 781 */ 782 783 rc = arp_send_request(device_id, protocol, target, device, proto); 784 if (rc != EOK) 785 return rc; 786 643 787 trans = (arp_trans_t *) malloc(sizeof(arp_trans_t)); 644 788 if (!trans) 645 789 return ENOMEM; 790 646 791 trans->hw_addr = NULL; 647 792 fibril_condvar_initialize(&trans->cv); 793 648 794 rc = arp_addr_add(&proto->addresses, target->value, target->length, 649 795 trans); … … 655 801 rc = fibril_condvar_wait_timeout(&trans->cv, &arp_globals.lock, 656 802 ARP_TRANS_WAIT); 657 if (rc == ETIMEOUT) 803 if (rc == ETIMEOUT) { 804 /* 805 * Remove the incomplete record so that it is possible to make 806 * new ARP requests. 807 */ 808 arp_clear_trans(trans); 809 arp_addr_exclude(&proto->addresses, target->value, 810 target->length); 658 811 return ENOENT; 812 } 813 814 /* 815 * We need to recheck that the translation has indeed become available, 816 * because we dropped the arp_globals.lock while sleeping on the 817 * condition variable and someone else might have e.g. removed the 818 * translation before we managed to lock arp_globals.lock again. 819 */ 820 659 821 retry = true; 660 822 goto restart; 661 823 } 662 824 663 664 /** Processes the ARP message. 665 * 666 * @param[in] callid The message identifier. 667 * @param[in] call The message parameters. 668 * @param[out] answer The message answer parameters. 669 * @param[out] answer_count The last parameter for the actual answer in the 670 * answer parameter. 671 * @return EOK on success. 672 * @return ENOTSUP if the message is not known. 825 /** Process the ARP message. 826 * 827 * @param[in] callid Message identifier. 828 * @param[in] call Message parameters. 829 * @param[out] answer Answer. 830 * @param[out] count Number of arguments of the answer. 831 * 832 * @return EOK on success. 833 * @return ENOTSUP if the message is not known. 673 834 * 674 835 * @see arp_interface.h 675 836 * @see IS_NET_ARP_MESSAGE() 676 * /677 int 678 arp_message_standalone(ipc_callid_t callid, ipc_call_t *call,679 ipc_call_t *answer, size_t *answer_count)837 * 838 */ 839 int il_module_message(ipc_callid_t callid, ipc_call_t *call, ipc_call_t *answer, 840 size_t *count) 680 841 { 681 842 measured_string_t *address; 682 843 measured_string_t *translation; 683 844 uint8_t *data; 684 packet_t *packet;685 packet_t *next;686 845 int rc; 687 846 688 * answer_count = 0;847 *count = 0; 689 848 switch (IPC_GET_IMETHOD(*call)) { 690 849 case IPC_M_PHONE_HUNGUP: … … 702 861 free(data); 703 862 } 863 704 864 return rc; 705 865 … … 714 874 free(address); 715 875 free(data); 876 716 877 if (rc != EOK) { 717 878 fibril_mutex_unlock(&arp_globals.lock); 718 879 return rc; 719 880 } 881 720 882 if (!translation) { 721 883 fibril_mutex_unlock(&arp_globals.lock); 722 884 return ENOENT; 723 885 } 886 724 887 rc = measured_strings_reply(translation, 1); 725 888 fibril_mutex_unlock(&arp_globals.lock); 726 889 return rc; 727 890 728 891 case NET_ARP_CLEAR_DEVICE: 729 892 return arp_clear_device_req(0, IPC_GET_DEVICE(*call)); 730 893 731 894 case NET_ARP_CLEAR_ADDRESS: 732 895 rc = measured_strings_receive(&address, &data, 1); … … 742 905 case NET_ARP_CLEAN_CACHE: 743 906 return arp_clean_cache_req(0); 744 745 case NET_IL_DEVICE_STATE:746 /* Do nothing - keep the cache */747 return EOK;748 749 case NET_IL_RECEIVED:750 751 rc = packet_translate_remote(arp_globals.net_phone, &packet,752 IPC_GET_PACKET(*call));753 if (rc != EOK)754 return rc;755 756 fibril_mutex_lock(&arp_globals.lock);757 do {758 next = pq_detach(packet);759 rc = arp_receive_message(IPC_GET_DEVICE(*call), packet);760 if (rc != 1) {761 pq_release_remote(arp_globals.net_phone,762 packet_get_id(packet));763 }764 packet = next;765 } while (packet);766 fibril_mutex_unlock(&arp_globals.lock);767 768 return EOK;769 770 case NET_IL_MTU_CHANGED:771 return arp_mtu_changed_message(IPC_GET_DEVICE(*call),772 IPC_GET_MTU(*call));773 907 } 774 908 … … 776 910 } 777 911 778 /** Default thread for new connections.779 *780 * @param[in] iid The initial message identifier.781 * @param[in] icall The initial message call structure.782 */783 static void il_client_connection(ipc_callid_t iid, ipc_call_t *icall)784 {785 /*786 * Accept the connection787 * - Answer the first IPC_M_CONNECT_ME_TO call.788 */789 ipc_answer_0(iid, EOK);790 791 while (true) {792 ipc_call_t answer;793 size_t count;794 795 /* Clear the answer structure */796 refresh_answer(&answer, &count);797 798 /* Fetch the next message */799 ipc_call_t call;800 ipc_callid_t callid = async_get_call(&call);801 802 /* Process the message */803 int res = il_module_message_standalone(callid, &call, &answer,804 &count);805 806 /*807 * End if told to either by the message or the processing808 * result.809 */810 if ((IPC_GET_IMETHOD(call) == IPC_M_PHONE_HUNGUP) ||811 (res == EHANGUP))812 return;813 814 /* Answer the message */815 answer_call(callid, res, &answer, count);816 }817 }818 819 /** Starts the module.820 *821 * @return EOK on success.822 * @return Other error codes as defined for each specific module823 * start function.824 */825 912 int main(int argc, char *argv[]) 826 913 { 827 int rc;828 829 914 /* Start the module */ 830 rc = il_module_start_standalone(il_client_connection); 831 return rc; 915 return il_module_start(SERVICE_ARP); 832 916 } 833 917 834 918 /** @} 835 919 */ 836
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