Changeset 8b5690f in mainline for uspace/srv/net/il/arp/arp.c
- Timestamp:
- 2011-02-03T05:11:01Z (13 years ago)
- Branches:
- lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export
- Children:
- ba38f72c
- Parents:
- 22027b6e (diff), 86d7bfa (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
r22027b6e r8b5690f 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> 49 45 #include <task.h> 50 46 #include <adt/measured_strings.h> 51 #include <ipc/ipc.h>52 47 #include <ipc/services.h> 53 48 #include <ipc/net.h> 54 49 #include <ipc/arp.h> 55 50 #include <ipc/il.h> 51 #include <ipc/nil.h> 56 52 #include <byteorder.h> 57 53 #include <errno.h> 58 59 54 #include <net/modules.h> 60 55 #include <net/device.h> 61 56 #include <net/packet.h> 62 63 #include <nil_interface.h> 57 #include <nil_remote.h> 64 58 #include <protocol_map.h> 65 59 #include <packet_client.h> 66 60 #include <packet_remote.h> 67 #include <il_ interface.h>68 #include <il_ local.h>69 61 #include <il_remote.h> 62 #include <il_skel.h> 63 #include "arp.h" 70 64 71 65 /** ARP module name. */ … … 73 67 74 68 /** Number of microseconds to wait for an ARP reply. */ 75 #define ARP_TRANS_WAIT 1000000 69 #define ARP_TRANS_WAIT 1000000 70 71 /** @name ARP operation codes definitions */ 72 /*@{*/ 73 74 /** REQUEST operation code. */ 75 #define ARPOP_REQUEST 1 76 77 /** REPLY operation code. */ 78 #define ARPOP_REPLY 2 79 80 /*@}*/ 81 82 /** Type definition of an ARP protocol header. 83 * @see arp_header 84 */ 85 typedef struct arp_header arp_header_t; 86 87 /** ARP protocol header. */ 88 struct arp_header { 89 /** 90 * Hardware type identifier. 91 * @see hardware.h 92 */ 93 uint16_t hardware; 94 95 /** Protocol identifier. */ 96 uint16_t protocol; 97 /** Hardware address length in bytes. */ 98 uint8_t hardware_length; 99 /** Protocol address length in bytes. */ 100 uint8_t protocol_length; 101 102 /** 103 * ARP packet type. 104 * @see arp_oc.h 105 */ 106 uint16_t operation; 107 } __attribute__ ((packed)); 76 108 77 109 /** ARP global data. */ … … 88 120 trans->hw_addr = NULL; 89 121 } 122 90 123 fibril_condvar_broadcast(&trans->cv); 91 124 } … … 94 127 { 95 128 int count; 96 arp_trans_t *trans; 97 129 98 130 for (count = arp_addr_count(addresses) - 1; count >= 0; count--) { 99 trans = arp_addr_items_get_index(&addresses->values, count); 131 arp_trans_t *trans = arp_addr_items_get_index(&addresses->values, 132 count); 100 133 if (trans) 101 134 arp_clear_trans(trans); … … 103 136 } 104 137 105 106 /** Clears the device specific data. 107 * 108 * @param[in] device The device specific data. 138 /** Clear the device specific data. 139 * 140 * @param[in] device Device specific data. 109 141 */ 110 142 static void arp_clear_device(arp_device_t *device) 111 143 { 112 144 int count; 113 arp_proto_t *proto; 114 145 115 146 for (count = arp_protos_count(&device->protos) - 1; count >= 0; 116 147 count--) { 117 proto = arp_protos_get_index(&device->protos, count); 148 arp_proto_t *proto = arp_protos_get_index(&device->protos, 149 count); 150 118 151 if (proto) { 119 152 if (proto->addr) 120 153 free(proto->addr); 154 121 155 if (proto->addr_data) 122 156 free(proto->addr_data); 157 123 158 arp_clear_addr(&proto->addresses); 124 159 arp_addr_destroy(&proto->addresses); 125 160 } 126 161 } 162 127 163 arp_protos_clear(&device->protos); 128 164 } … … 131 167 { 132 168 int count; 133 arp_device_t *device; 134 169 135 170 fibril_mutex_lock(&arp_globals.lock); 136 171 for (count = arp_cache_count(&arp_globals.cache) - 1; count >= 0; 137 172 count--) { 138 device = arp_cache_get_index(&arp_globals.cache, count); 173 arp_device_t *device = arp_cache_get_index(&arp_globals.cache, 174 count); 175 139 176 if (device) { 140 177 arp_clear_device(device); 141 178 if (device->addr_data) 142 179 free(device->addr_data); 180 143 181 if (device->broadcast_data) 144 182 free(device->broadcast_data); 145 183 } 146 184 } 185 147 186 arp_cache_clear(&arp_globals.cache); 148 187 fibril_mutex_unlock(&arp_globals.lock); 149 printf("Cache cleaned\n");188 150 189 return EOK; 151 190 } … … 154 193 services_t protocol, measured_string_t *address) 155 194 { 156 arp_device_t *device;157 arp_proto_t *proto;158 arp_trans_t *trans;159 160 195 fibril_mutex_lock(&arp_globals.lock); 161 device = arp_cache_find(&arp_globals.cache, device_id); 196 197 arp_device_t *device = arp_cache_find(&arp_globals.cache, device_id); 162 198 if (!device) { 163 199 fibril_mutex_unlock(&arp_globals.lock); 164 200 return ENOENT; 165 201 } 166 proto = arp_protos_find(&device->protos, protocol); 202 203 arp_proto_t *proto = arp_protos_find(&device->protos, protocol); 167 204 if (!proto) { 168 205 fibril_mutex_unlock(&arp_globals.lock); 169 206 return ENOENT; 170 207 } 171 trans = arp_addr_find(&proto->addresses, address->value, address->length); 208 209 arp_trans_t *trans = arp_addr_find(&proto->addresses, address->value, 210 address->length); 172 211 if (trans) 173 212 arp_clear_trans(trans); 213 174 214 arp_addr_exclude(&proto->addresses, address->value, address->length); 215 175 216 fibril_mutex_unlock(&arp_globals.lock); 176 217 return EOK; 177 218 } 178 219 179 180 220 static int arp_clear_device_req(int arp_phone, device_id_t device_id) 181 221 { 182 arp_device_t *device;183 184 222 fibril_mutex_lock(&arp_globals.lock); 185 device = arp_cache_find(&arp_globals.cache, device_id); 223 224 arp_device_t *device = arp_cache_find(&arp_globals.cache, device_id); 186 225 if (!device) { 187 226 fibril_mutex_unlock(&arp_globals.lock); 188 227 return ENOENT; 189 228 } 229 190 230 arp_clear_device(device); 191 printf("Device %d cleared\n", device_id);231 192 232 fibril_mutex_unlock(&arp_globals.lock); 193 233 return EOK; 194 234 } 195 235 196 /** 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. 236 /** Create new protocol specific data. 237 * 238 * Allocate and return the needed memory block as the proto parameter. 239 * 240 * @param[out] proto Allocated protocol specific data. 241 * @param[in] service Protocol module service. 242 * @param[in] address Actual protocol device address. 243 * 244 * @return EOK on success. 245 * @return ENOMEM if there is not enough memory left. 246 * 205 247 */ 206 248 static int arp_proto_create(arp_proto_t **proto, services_t service, 207 249 measured_string_t *address) 208 250 { 209 int rc;210 211 251 *proto = (arp_proto_t *) malloc(sizeof(arp_proto_t)); 212 252 if (!*proto) … … 217 257 (*proto)->addr_data = address->value; 218 258 219 rc = arp_addr_initialize(&(*proto)->addresses);259 int rc = arp_addr_initialize(&(*proto)->addresses); 220 260 if (rc != EOK) { 221 261 free(*proto); … … 226 266 } 227 267 228 /** 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; 268 /** Process the received ARP packet. 269 * 270 * Update the source hardware address if the source entry exists or the packet 271 * is targeted to my protocol address. 272 * 273 * Respond to the ARP request if the packet is the ARP request and is 274 * targeted to my address. 275 * 276 * @param[in] device_id Source device identifier. 277 * @param[in,out] packet Received packet. 278 * 279 * @return EOK on success and the packet is no longer needed. 280 * @return One on success and the packet has been reused. 281 * @return EINVAL if the packet is too small to carry an ARP 282 * packet. 283 * @return EINVAL if the received address lengths differs from 284 * the registered values. 285 * @return ENOENT if the device is not found in the cache. 286 * @return ENOENT if the protocol for the device is not found in 287 * the cache. 288 * @return ENOMEM if there is not enough memory left. 289 * 290 */ 291 static int arp_receive_message(device_id_t device_id, packet_t *packet) 292 { 251 293 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); 294 295 size_t length = packet_get_data_length(packet); 461 296 if (length <= sizeof(arp_header_t)) 462 297 return EINVAL; 463 464 device = arp_cache_find(&arp_globals.cache, device_id);298 299 arp_device_t *device = arp_cache_find(&arp_globals.cache, device_id); 465 300 if (!device) 466 301 return ENOENT; 467 468 header = (arp_header_t *) packet_get_data(packet);302 303 arp_header_t *header = (arp_header_t *) packet_get_data(packet); 469 304 if ((ntohs(header->hardware) != device->hardware) || 470 305 (length < sizeof(arp_header_t) + header->hardware_length * 2U + … … 472 307 return EINVAL; 473 308 } 474 475 proto = arp_protos_find(&device->protos,309 310 arp_proto_t *proto = arp_protos_find(&device->protos, 476 311 protocol_unmap(device->service, ntohs(header->protocol))); 477 312 if (!proto) 478 313 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, 314 315 uint8_t *src_hw = ((uint8_t *) header) + sizeof(arp_header_t); 316 uint8_t *src_proto = src_hw + header->hardware_length; 317 uint8_t *des_hw = src_proto + header->protocol_length; 318 uint8_t *des_proto = des_hw + header->hardware_length; 319 320 arp_trans_t *trans = arp_addr_find(&proto->addresses, src_proto, 485 321 header->protocol_length); 486 /* Exists? */ 487 if (trans && trans->hw_addr) { 322 323 if ((trans) && (trans->hw_addr)) { 324 /* Translation exists */ 488 325 if (trans->hw_addr->length != header->hardware_length) 489 326 return EINVAL; 327 490 328 memcpy(trans->hw_addr->value, src_hw, trans->hw_addr->length); 491 329 } 330 492 331 /* Is my protocol address? */ 493 332 if (proto->addr->length != header->protocol_length) … … 495 334 496 335 if (!bcmp(proto->addr->value, des_proto, proto->addr->length)) { 497 /* Not already updated? */498 336 if (!trans) { 337 /* Update the translation */ 499 338 trans = (arp_trans_t *) malloc(sizeof(arp_trans_t)); 500 339 if (!trans) 501 340 return ENOMEM; 341 502 342 trans->hw_addr = NULL; 503 343 fibril_condvar_initialize(&trans->cv); … … 509 349 } 510 350 } 351 511 352 if (!trans->hw_addr) { 512 353 trans->hw_addr = measured_string_create_bulk(src_hw, … … 518 359 fibril_condvar_broadcast(&trans->cv); 519 360 } 361 520 362 if (ntohs(header->operation) == ARPOP_REQUEST) { 521 363 header->operation = htons(ARPOP_REPLY); … … 538 380 } 539 381 } 540 382 541 383 return EOK; 542 384 } 543 385 544 545 /** 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; 386 /** Update the device content length according to the new MTU value. 387 * 388 * @param[in] device_id Device identifier. 389 * @param[in] mtu New MTU value. 390 * 391 * @return ENOENT if device is not found. 392 * @return EOK on success. 393 * 394 */ 395 static int arp_mtu_changed_message(device_id_t device_id, size_t mtu) 396 { 397 fibril_mutex_lock(&arp_globals.lock); 398 399 arp_device_t *device = arp_cache_find(&arp_globals.cache, device_id); 400 if (!device) { 401 fibril_mutex_unlock(&arp_globals.lock); 402 return ENOENT; 403 } 404 405 device->packet_dimension.content = mtu; 406 407 fibril_mutex_unlock(&arp_globals.lock); 408 409 printf("%s: Device %d changed MTU to %zu\n", NAME, device_id, mtu); 410 411 return EOK; 412 } 413 414 /** Process IPC messages from the registered device driver modules 415 * 416 * @param[in] iid Message identifier. 417 * @param[in,out] icall Message parameters. 418 * 419 */ 420 static void arp_receiver(ipc_callid_t iid, ipc_call_t *icall) 421 { 566 422 packet_t *packet; 567 arp_header_t *header;568 bool retry = false;569 423 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) 424 425 while (true) { 426 switch (IPC_GET_IMETHOD(*icall)) { 427 case NET_IL_DEVICE_STATE: 428 /* Do nothing - keep the cache */ 429 async_answer_0(iid, (sysarg_t) EOK); 430 break; 431 432 case NET_IL_RECEIVED: 433 rc = packet_translate_remote(arp_globals.net_phone, &packet, 434 IPC_GET_PACKET(*icall)); 435 if (rc == EOK) { 436 fibril_mutex_lock(&arp_globals.lock); 437 do { 438 packet_t *next = pq_detach(packet); 439 rc = arp_receive_message(IPC_GET_DEVICE(*icall), packet); 440 if (rc != 1) { 441 pq_release_remote(arp_globals.net_phone, 442 packet_get_id(packet)); 443 } 444 445 packet = next; 446 } while (packet); 447 fibril_mutex_unlock(&arp_globals.lock); 448 } 449 async_answer_0(iid, (sysarg_t) rc); 450 break; 451 452 case NET_IL_MTU_CHANGED: 453 rc = arp_mtu_changed_message(IPC_GET_DEVICE(*icall), 454 IPC_GET_MTU(*icall)); 455 async_answer_0(iid, (sysarg_t) rc); 456 break; 457 458 default: 459 async_answer_0(iid, (sysarg_t) ENOTSUP); 460 } 461 462 iid = async_get_call(icall); 463 } 464 } 465 466 /** Register the device. 467 * 468 * Create new device entry in the cache or update the protocol address if the 469 * device with the device identifier and the driver service exists. 470 * 471 * @param[in] device_id Device identifier. 472 * @param[in] service Device driver service. 473 * @param[in] protocol Protocol service. 474 * @param[in] address Actual device protocol address. 475 * 476 * @return EOK on success. 477 * @return EEXIST if another device with the same device identifier 478 * and different driver service exists. 479 * @return ENOMEM if there is not enough memory left. 480 * @return Other error codes as defined for the 481 * measured_strings_return() function. 482 * 483 */ 484 static int arp_device_message(device_id_t device_id, services_t service, 485 services_t protocol, measured_string_t *address) 486 { 487 int index; 488 int rc; 489 490 fibril_mutex_lock(&arp_globals.lock); 491 492 /* An existing device? */ 493 arp_device_t *device = arp_cache_find(&arp_globals.cache, device_id); 494 if (device) { 495 if (device->service != service) { 496 printf("%s: Device %d already exists\n", NAME, 497 device->device_id); 498 fibril_mutex_unlock(&arp_globals.lock); 499 return EEXIST; 500 } 501 502 arp_proto_t *proto = arp_protos_find(&device->protos, protocol); 503 if (proto) { 504 free(proto->addr); 505 free(proto->addr_data); 506 proto->addr = address; 507 proto->addr_data = address->value; 508 } else { 509 rc = arp_proto_create(&proto, protocol, address); 510 if (rc != EOK) { 511 fibril_mutex_unlock(&arp_globals.lock); 512 return rc; 513 } 514 515 index = arp_protos_add(&device->protos, proto->service, 516 proto); 517 if (index < 0) { 518 fibril_mutex_unlock(&arp_globals.lock); 519 free(proto); 520 return index; 521 } 522 523 printf("%s: New protocol added (id: %d, proto: %d)\n", NAME, 524 device_id, protocol); 525 } 526 } else { 527 hw_type_t hardware = hardware_map(service); 528 if (!hardware) 594 529 return ENOENT; 595 retry = true; 596 goto restart; 597 } 598 if (retry) 599 return EAGAIN; 600 530 531 /* Create new device */ 532 device = (arp_device_t *) malloc(sizeof(arp_device_t)); 533 if (!device) { 534 fibril_mutex_unlock(&arp_globals.lock); 535 return ENOMEM; 536 } 537 538 device->hardware = hardware; 539 device->device_id = device_id; 540 rc = arp_protos_initialize(&device->protos); 541 if (rc != EOK) { 542 fibril_mutex_unlock(&arp_globals.lock); 543 free(device); 544 return rc; 545 } 546 547 arp_proto_t *proto; 548 rc = arp_proto_create(&proto, protocol, address); 549 if (rc != EOK) { 550 fibril_mutex_unlock(&arp_globals.lock); 551 free(device); 552 return rc; 553 } 554 555 index = arp_protos_add(&device->protos, proto->service, proto); 556 if (index < 0) { 557 fibril_mutex_unlock(&arp_globals.lock); 558 arp_protos_destroy(&device->protos); 559 free(device); 560 return index; 561 } 562 563 device->service = service; 564 565 /* Bind */ 566 device->phone = nil_bind_service(device->service, 567 (sysarg_t) device->device_id, SERVICE_ARP, 568 arp_receiver); 569 if (device->phone < 0) { 570 fibril_mutex_unlock(&arp_globals.lock); 571 arp_protos_destroy(&device->protos); 572 free(device); 573 return EREFUSED; 574 } 575 576 /* Get packet dimensions */ 577 rc = nil_packet_size_req(device->phone, device_id, 578 &device->packet_dimension); 579 if (rc != EOK) { 580 fibril_mutex_unlock(&arp_globals.lock); 581 arp_protos_destroy(&device->protos); 582 free(device); 583 return rc; 584 } 585 586 /* Get hardware address */ 587 rc = nil_get_addr_req(device->phone, device_id, &device->addr, 588 &device->addr_data); 589 if (rc != EOK) { 590 fibril_mutex_unlock(&arp_globals.lock); 591 arp_protos_destroy(&device->protos); 592 free(device); 593 return rc; 594 } 595 596 /* Get broadcast address */ 597 rc = nil_get_broadcast_addr_req(device->phone, device_id, 598 &device->broadcast_addr, &device->broadcast_data); 599 if (rc != EOK) { 600 fibril_mutex_unlock(&arp_globals.lock); 601 free(device->addr); 602 free(device->addr_data); 603 arp_protos_destroy(&device->protos); 604 free(device); 605 return rc; 606 } 607 608 rc = arp_cache_add(&arp_globals.cache, device->device_id, 609 device); 610 if (rc != EOK) { 611 fibril_mutex_unlock(&arp_globals.lock); 612 free(device->addr); 613 free(device->addr_data); 614 free(device->broadcast_addr); 615 free(device->broadcast_data); 616 arp_protos_destroy(&device->protos); 617 free(device); 618 return rc; 619 } 620 printf("%s: Device registered (id: %d, type: 0x%x, service: %d," 621 " proto: %d)\n", NAME, device->device_id, device->hardware, 622 device->service, protocol); 623 } 624 625 fibril_mutex_unlock(&arp_globals.lock); 626 return EOK; 627 } 628 629 int il_initialize(int net_phone) 630 { 631 fibril_mutex_initialize(&arp_globals.lock); 632 633 fibril_mutex_lock(&arp_globals.lock); 634 arp_globals.net_phone = net_phone; 635 int rc = arp_cache_initialize(&arp_globals.cache); 636 fibril_mutex_unlock(&arp_globals.lock); 637 638 return rc; 639 } 640 641 static int arp_send_request(device_id_t device_id, services_t protocol, 642 measured_string_t *target, arp_device_t *device, arp_proto_t *proto) 643 { 601 644 /* ARP packet content size = header + (address + translation) * 2 */ 602 length = 8 + 2 * (proto->addr->length + device->addr->length);645 size_t length = 8 + 2 * (proto->addr->length + device->addr->length); 603 646 if (length > device->packet_dimension.content) 604 647 return ELIMIT; 605 606 packet = packet_get_4_remote(arp_globals.net_phone,648 649 packet_t *packet = packet_get_4_remote(arp_globals.net_phone, 607 650 device->packet_dimension.addr_len, device->packet_dimension.prefix, 608 651 length, device->packet_dimension.suffix); 609 652 if (!packet) 610 653 return ENOMEM; 611 612 header = (arp_header_t *) packet_suffix(packet, length);654 655 arp_header_t *header = (arp_header_t *) packet_suffix(packet, length); 613 656 if (!header) { 614 657 pq_release_remote(arp_globals.net_phone, packet_get_id(packet)); 615 658 return ENOMEM; 616 659 } 617 660 618 661 header->hardware = htons(device->hardware); 619 662 header->hardware_length = (uint8_t) device->addr->length; … … 621 664 header->protocol_length = (uint8_t) proto->addr->length; 622 665 header->operation = htons(ARPOP_REQUEST); 666 623 667 length = sizeof(arp_header_t); 668 624 669 memcpy(((uint8_t *) header) + length, device->addr->value, 625 670 device->addr->length); … … 631 676 length += device->addr->length; 632 677 memcpy(((uint8_t *) header) + length, target->value, target->length); 633 634 rc = packet_set_addr(packet, (uint8_t *) device->addr->value,678 679 int rc = packet_set_addr(packet, (uint8_t *) device->addr->value, 635 680 (uint8_t *) device->broadcast_addr->value, device->addr->length); 636 681 if (rc != EOK) { … … 638 683 return rc; 639 684 } 640 685 641 686 nil_send_msg(device->phone, device_id, packet, SERVICE_ARP); 642 687 return EOK; 688 } 689 690 /** Return the hardware address for the given protocol address. 691 * 692 * Send the ARP request packet if the hardware address is not found in the 693 * cache. 694 * 695 * @param[in] device_id Device identifier. 696 * @param[in] protocol Protocol service. 697 * @param[in] target Target protocol address. 698 * @param[out] translation Where the hardware address of the target is stored. 699 * 700 * @return EOK on success. 701 * @return EAGAIN if the caller should try again. 702 * @return Other error codes in case of error. 703 * 704 */ 705 static int arp_translate_message(device_id_t device_id, services_t protocol, 706 measured_string_t *target, measured_string_t **translation) 707 { 708 bool retry = false; 709 int rc; 710 711 assert(fibril_mutex_is_locked(&arp_globals.lock)); 712 713 restart: 714 if ((!target) || (!translation)) 715 return EBADMEM; 716 717 arp_device_t *device = arp_cache_find(&arp_globals.cache, device_id); 718 if (!device) 719 return ENOENT; 720 721 arp_proto_t *proto = arp_protos_find(&device->protos, protocol); 722 if ((!proto) || (proto->addr->length != target->length)) 723 return ENOENT; 724 725 arp_trans_t *trans = arp_addr_find(&proto->addresses, target->value, 726 target->length); 727 if (trans) { 728 if (trans->hw_addr) { 729 /* The translation is in place. */ 730 *translation = trans->hw_addr; 731 return EOK; 732 } 733 734 if (retry) { 735 /* 736 * We may get here as a result of being signalled for 737 * some reason while waiting for the translation (e.g. 738 * translation becoming available, record being removed 739 * from the table) and then losing the race for 740 * the arp_globals.lock with someone else who modified 741 * the table. 742 * 743 * Remove the incomplete record so that it is possible 744 * to make new ARP requests. 745 */ 746 arp_clear_trans(trans); 747 arp_addr_exclude(&proto->addresses, target->value, 748 target->length); 749 return EAGAIN; 750 } 751 752 /* 753 * We are a random passer-by who merely joins an already waiting 754 * fibril in waiting for the translation. 755 */ 756 rc = fibril_condvar_wait_timeout(&trans->cv, &arp_globals.lock, 757 ARP_TRANS_WAIT); 758 if (rc == ETIMEOUT) 759 return ENOENT; 760 761 /* 762 * Need to recheck because we did not hold the lock while 763 * sleeping on the condition variable. 764 */ 765 retry = true; 766 goto restart; 767 } 768 769 if (retry) 770 return EAGAIN; 771 772 /* 773 * We are under the protection of arp_globals.lock, so we can afford to 774 * first send the ARP request and then insert an incomplete ARP record. 775 * The incomplete record is used to tell any other potential waiter 776 * that this fibril has already sent the request and that it is waiting 777 * for the answer. Lastly, any fibril which sees the incomplete request 778 * can perform a timed wait on its condition variable to wait for the 779 * ARP reply to arrive. 780 */ 781 782 rc = arp_send_request(device_id, protocol, target, device, proto); 783 if (rc != EOK) 784 return rc; 785 643 786 trans = (arp_trans_t *) malloc(sizeof(arp_trans_t)); 644 787 if (!trans) 645 788 return ENOMEM; 789 646 790 trans->hw_addr = NULL; 647 791 fibril_condvar_initialize(&trans->cv); 792 648 793 rc = arp_addr_add(&proto->addresses, target->value, target->length, 649 794 trans); … … 655 800 rc = fibril_condvar_wait_timeout(&trans->cv, &arp_globals.lock, 656 801 ARP_TRANS_WAIT); 657 if (rc == ETIMEOUT) 802 if (rc == ETIMEOUT) { 803 /* 804 * Remove the incomplete record so that it is possible to make 805 * new ARP requests. 806 */ 807 arp_clear_trans(trans); 808 arp_addr_exclude(&proto->addresses, target->value, 809 target->length); 658 810 return ENOENT; 811 } 812 813 /* 814 * We need to recheck that the translation has indeed become available, 815 * because we dropped the arp_globals.lock while sleeping on the 816 * condition variable and someone else might have e.g. removed the 817 * translation before we managed to lock arp_globals.lock again. 818 */ 819 659 820 retry = true; 660 821 goto restart; 661 822 } 662 823 663 664 /** 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. 824 /** Process the ARP message. 825 * 826 * @param[in] callid Message identifier. 827 * @param[in] call Message parameters. 828 * @param[out] answer Answer. 829 * @param[out] count Number of arguments of the answer. 830 * 831 * @return EOK on success. 832 * @return ENOTSUP if the message is not known. 673 833 * 674 834 * @see arp_interface.h 675 835 * @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, int *answer_count)836 * 837 */ 838 int il_module_message(ipc_callid_t callid, ipc_call_t *call, ipc_call_t *answer, 839 size_t *count) 680 840 { 681 841 measured_string_t *address; 682 842 measured_string_t *translation; 683 843 uint8_t *data; 684 packet_t *packet;685 packet_t *next;686 844 int rc; 687 845 688 * answer_count = 0;846 *count = 0; 689 847 switch (IPC_GET_IMETHOD(*call)) { 690 848 case IPC_M_PHONE_HUNGUP: … … 696 854 return rc; 697 855 698 rc = arp_device_message(IPC_GET_DEVICE( call),699 IPC_GET_SERVICE( call), ARP_GET_NETIF(call), address);856 rc = arp_device_message(IPC_GET_DEVICE(*call), 857 IPC_GET_SERVICE(*call), ARP_GET_NETIF(*call), address); 700 858 if (rc != EOK) { 701 859 free(address); 702 860 free(data); 703 861 } 862 704 863 return rc; 705 864 … … 710 869 711 870 fibril_mutex_lock(&arp_globals.lock); 712 rc = arp_translate_message(IPC_GET_DEVICE( call),713 IPC_GET_SERVICE( call), address, &translation);871 rc = arp_translate_message(IPC_GET_DEVICE(*call), 872 IPC_GET_SERVICE(*call), address, &translation); 714 873 free(address); 715 874 free(data); 875 716 876 if (rc != EOK) { 717 877 fibril_mutex_unlock(&arp_globals.lock); 718 878 return rc; 719 879 } 880 720 881 if (!translation) { 721 882 fibril_mutex_unlock(&arp_globals.lock); 722 883 return ENOENT; 723 884 } 885 724 886 rc = measured_strings_reply(translation, 1); 725 887 fibril_mutex_unlock(&arp_globals.lock); 726 888 return rc; 727 889 728 890 case NET_ARP_CLEAR_DEVICE: 729 return arp_clear_device_req(0, IPC_GET_DEVICE( call));730 891 return arp_clear_device_req(0, IPC_GET_DEVICE(*call)); 892 731 893 case NET_ARP_CLEAR_ADDRESS: 732 894 rc = measured_strings_receive(&address, &data, 1); … … 734 896 return rc; 735 897 736 arp_clear_address_req(0, IPC_GET_DEVICE( call),737 IPC_GET_SERVICE( call), address);898 arp_clear_address_req(0, IPC_GET_DEVICE(*call), 899 IPC_GET_SERVICE(*call), address); 738 900 free(address); 739 901 free(data); … … 742 904 case NET_ARP_CLEAN_CACHE: 743 905 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));773 906 } 774 907 … … 776 909 } 777 910 778 /** 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 int answer_count;794 795 /* Clear the answer structure */796 refresh_answer(&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 &answer_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, 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 */825 911 int main(int argc, char *argv[]) 826 912 { 827 int rc;828 829 913 /* Start the module */ 830 rc = il_module_start_standalone(il_client_connection); 831 return rc; 914 return il_module_start(SERVICE_ARP); 832 915 } 833 916 834 917 /** @} 835 918 */ 836
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