WebSVN – HelenOS – Diff – /branches/network/uspace/srv/net/il/arp/arp.c

 /*
  * Copyright (c) 2009 Lukas Mejdrech
  * All rights reserved.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
+ *
  * - Redistributions of source code must retain the above copyright
  *   notice, this list of conditions and the following disclaimer.
  * - Redistributions in binary form must reproduce the above copyright
  *   notice, this list of conditions and the following disclaimer in the
  *   documentation and/or other materials provided with the distribution.
  * - The name of the author may not be used to endorse or promote products
  *   derived from this software without specific prior written permission.
+ *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 /** @addtogroup arp
  *  @{
  */
 /** @file
  *  ARP module implementation.
  *  @see arp.h
  */
-#include <as.h>
 #include <async.h>
 #include <malloc.h>
+#include <rwlock.h>
 #include <stdio.h>
 #include <string.h>
 #include <ipc/ipc.h>
 #include <ipc/services.h>
 #include "../../err.h"
 #include "../../messages.h"
 #include "../../modules.h"
 #include "../../include/protocol_map.h"
 #include "../../netif/device.h"
 #include "../../structures/measured_strings.h"
 #include "../../structures/packet/packet.h"
 #include "../../structures/packet/packet_client.h"
 #include "arp.h"
 #include "arp_header.h"
 #include "arp_oc.h"
 //#include "arp_messages.h"
 #include "arp_module.h"
 /** Returns the device identifier message parameter.
  */
 #define IPC_GET_DEVICE( call )      ( device_id_t ) IPC_GET_ARG1( * call )
 /** Returns the packet identifier message parameter.
  */
 #define IPC_GET_PACKET( call )      ( packet_id_t ) IPC_GET_ARG2( * call )
 /** Returns the protocol service message parameter.
  */
 #define IPC_GET_PROTO( call )       ( services_t ) IPC_GET_ARG2( * call )
 /** Returns the device driver service message parameter.
  */
 #define IPC_GET_SERVICE( call )     ( services_t ) IPC_GET_ARG3( * call )
 /** ARP global data.
  */
 arp_globals_t   arp_globals;
 /** Creates new protocol specific data.
  *  @param proto Protocol specific data. Output parameter.
  *  @param service Protocol module service. Input parameter.
  *  @param address Actual protocol device address. Input parameter.
  *  @returns EOK on success.
  *  @returns ENOMEM if there is not enough memory left.
  */
 int arp_proto_create( arp_proto_ref * proto, services_t service, measured_string_ref address );
 /** Registers the device.
  *  Creates new device entry in the cache or updates the protocol address if the device with the device identifier and the driver service exists.
  *  @param device_id The device identifier. Input parameter.
  *  @param service The device driver service. Input parameter.
  *  @param protocol The protocol service. Input parameter.
  *  @param address The actual device protocol address.
  *  @returns EOK on success.
  *  @returns EEXIST if another device with the same device identifier and different driver service exists.
  *  @returns ENOMEM if there is not enough memory left.
  *  @returns Other error codes as defined for the measured_strings_return() function.
  */
 int arp_device_message( device_id_t device_id, services_t service, services_t protocol, measured_string_ref address );
 /** Returns the hardware address for the given protocol address.
  *  Sends the ARP request packet if the hardware address is not found in the cache.
  *  @param device_id The device identifier. Input parameter.
  *  @param protocol The protocol service. Input parameter.
  *  @param target The target protocol address. Input parameter.
  *  @returns The hardware address of the target.
  *  @returns NULL if the target parameter is NULL.
  *  @returns NULL if the device is not found.
  *  @returns NULL if the device packet is too small to send a&nbsp;request.
  *  @returns NULL if the hardware address is not found in the cache.
  */
 measured_string_ref arp_translate_message( device_id_t device_id, services_t protocol, measured_string_ref target );
 /** Processes the received ARP packet.
  *  Updates the source hardware address if the source entry exists or the packet is targeted to my protocol address.
  *  Responses to the ARP request if the packet is the ARP request and is targeted to my address.
  *  @param device_id The source device identifier. Input parameter.
  *  @param packet The received packet. Input/output parameter.
  *  @returns EOK on success.
  *  @returns EINVAL if the packet is too small to carry the ARP packet.
  *  @returns EINVAL if the received address lengths differs from the registered values.
  *  @returns ENOENT if the device is not found in the cache.
  *  @returns ENOENT if the protocol for the device is not found in the cache.
  *  @returns ENOMEM if there is not enough memory left.
  */
 int arp_receive_message( device_id_t device_id, packet_t packet );
 /** Clears the device specific data from the cache.
  *  @param device_id The device identifier. Input parameter.
  *  @returns EOK on success.
  *  @returns ENOENT  if the device is not found in the cache.
  */
 int arp_clear_device_message( device_id_t device_id );
 /** Clears the device specific data.
  *  @param device The device specific data.
  */
 void    clear_device( arp_device_ref device );
 /** Clears the whole cache.
  *  @returns EOK on success.
  */
 int arp_clean_cache_message( void );
 /** Processes IPC messages from the registered device driver modules in an infinite loop.
  *  @param iid The message identifier. Input parameter.
  *  @param icall The message parameters. Input/output parameter.
  */
 void    arp_receiver( ipc_callid_t iid, ipc_call_t * icall );
 DEVICE_MAP_IMPLEMENT( arp_cache, arp_device_t )
 INT_MAP_IMPLEMENT( arp_protos, arp_proto_t )
 GENERIC_CHAR_MAP_IMPLEMENT( arp_addr, measured_string_t )
 int arp_initialize( void ){
+    ERROR_DECLARE;
+    rwlock_initialize( & arp_globals.lock );
+    rwlock_write_lock( & arp_globals.lock );
-    return arp_cache_initialize( & arp_globals.cache );
+    ERROR_PROPAGATE( arp_cache_initialize( & arp_globals.cache ));
+    rwlock_write_unlock( & arp_globals.lock );
+    return EOK;
+}
 int arp_proto_create( arp_proto_ref * proto, services_t service, measured_string_ref address ){
     ERROR_DECLARE;
     * proto = ( arp_proto_ref ) malloc( sizeof( arp_proto_t ));
     if( !( * proto )) return ENOMEM;
     ( ** proto ).service = service;
     ( ** proto ).addr = address;
     ( ** proto ).addr_data = address->value;
     if( ERROR_OCCURRED( arp_addr_initialize( &( ** proto).addresses ))){
         free( * proto );
         return ERROR_CODE;
+    }
     return EOK;
+}
 int arp_device_message( device_id_t device_id, services_t service, services_t protocol, measured_string_ref address ){
     ERROR_DECLARE;
     arp_device_ref  device;
     aid_t           message;
     ipc_call_t      answer;
     ipcarg_t        result;
     arp_proto_ref   proto;
+    rwlock_write_lock( & arp_globals.lock );
     // an existing device?
     device = arp_cache_find( & arp_globals.cache, device_id );
     if( device ){
-        if( device->service != service ) return EEXIST;
+        if( device->service != service ){
+            rwlock_write_unlock( & arp_globals.lock );
+            return EEXIST;
+        }
         proto = arp_protos_find( & device->protos, protocol );
         if( proto ){
             free( proto->addr );
             free( proto->addr_data );
             proto->addr = address;
             proto->addr_data = address->value;
         }else{
-            ERROR_PROPAGATE( arp_proto_create( & proto, protocol, address ));
+            if( ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
+                rwlock_write_unlock( & arp_globals.lock );
+                return ERROR_CODE;
+            }
             if( ERROR_OCCURRED( arp_protos_add( & device->protos, proto->service, proto ))){
+                rwlock_write_unlock( & arp_globals.lock );
                 free( proto );
                 return ERROR_CODE;
+            }
+        }
         return EOK;
     }else{
         // create a new device
         device = ( arp_device_ref ) malloc( sizeof( arp_device_t ));
+        if( ! device ){
+            rwlock_write_unlock( & arp_globals.lock );
-        if( ! device ) return ENOMEM;
+            return ENOMEM;
+        }
         device->device_id = device_id;
         if( ERROR_OCCURRED( arp_protos_initialize( & device->protos ))
         || ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){
+            rwlock_write_unlock( & arp_globals.lock );
             free( device );
             return ERROR_CODE;
+        }
         if( ERROR_OCCURRED( arp_protos_add( & device->protos, proto->service, proto ))){
+            rwlock_write_unlock( & arp_globals.lock );
             arp_protos_destroy( & device->protos );
             free( device );
             return ERROR_CODE;
+        }
         device->service = service;
         // bind the new one
         device->phone = bind_service( device->service, device->device_id, SERVICE_ARP, 0, arp_receiver );
         // get packet dimensions
         if( ERROR_OCCURRED( async_req_1_4( device->phone, NET_NIL_PACKET_SPACE, device_id, & device->addr_len, & device->prefix, & device->content, & device->suffix ))){
+            rwlock_write_unlock( & arp_globals.lock );
             arp_protos_destroy( & device->protos );
             free( device );
             return ERROR_CODE;
+        }
         // get hardware address
         message = async_send_1( device->phone, NET_NIL_ADDR, device->device_id, & answer );
         if( ERROR_OCCURRED( measured_strings_return( device->phone, & device->addr, & device->addr_data, 1 ))){
+            rwlock_write_unlock( & arp_globals.lock );
             arp_protos_destroy( & device->protos );
             free( device );
             async_wait_for( message, NULL );
             return ERROR_CODE;
+        }
         async_wait_for( message, & result );
         if( ERROR_OCCURRED( result )){
+            rwlock_write_unlock( & arp_globals.lock );
             free( device->addr );
             free( device->addr_data );
             arp_protos_destroy( & device->protos );
             free( device );
             return ERROR_CODE;
+        }
         // get broadcast address
         message = async_send_1( device->phone, NET_NIL_BROADCAST_ADDR, device->device_id, & answer );
         if( ERROR_OCCURRED( measured_strings_return( device->phone, & device->broadcast_addr, & device->broadcast_data, 1 ))){
+            rwlock_write_unlock( & arp_globals.lock );
             free( device->addr );
             free( device->addr_data );
             arp_protos_destroy( & device->protos );
             free( device );
             async_wait_for( message, NULL );
             return ERROR_CODE;
+        }
         async_wait_for( message, & result );
         // add to the cache
         if( ERROR_OCCURRED( result )
         || ERROR_OCCURRED( arp_cache_add( & arp_globals.cache, device->device_id, device ))){
+            rwlock_write_unlock( & arp_globals.lock );
             free( device->addr );
             free( device->addr_data );
             free( device->broadcast_addr );
             free( device->broadcast_data );
             arp_protos_destroy( & device->protos );
             free( device );
             return ERROR_CODE;
+        }
+    }
+    rwlock_write_unlock( & arp_globals.lock );
     return EOK;
+}
 measured_string_ref arp_translate_message( device_id_t device_id, services_t protocol, measured_string_ref target ){
     arp_device_ref      device;
     arp_proto_ref       proto;
     measured_string_ref addr;
     size_t              length;
     packet_t            packet;
     arp_header_ref      header;
     if( ! target ) return NULL;
+    rwlock_read_lock( & arp_globals.lock );
     device = arp_cache_find( & arp_globals.cache, device_id );
-    if( ! device ) return NULL;
+    if( ! device ){
+        rwlock_read_unlock( & arp_globals.lock );
+        return NULL;
+    }
     proto = arp_protos_find( & device->protos, protocol );
-    if(( ! proto ) || ( proto->addr->length != target->length )) return NULL;
+    if(( ! proto ) || ( proto->addr->length != target->length )){
+        rwlock_read_unlock( & arp_globals.lock );
+        return NULL;
+    }
     addr = arp_addr_find( & proto->addresses, target->value, target->length );
+    if( addr ){
+        rwlock_read_unlock( & arp_globals.lock );
-    if( addr ) return addr;
+        return addr;
+    }
     // ARP packet content size = header + ( address + translation ) * 2
     length = 8 + ( CONVERT_SIZE( char, uint8_t, proto->addr->length ) + CONVERT_SIZE( char, uint8_t, device->addr->length )) * 2;
     if( length > device->content ){
+        rwlock_read_unlock( & arp_globals.lock );
+        return NULL;
+    }
+    packet = packet_get_4( arp_globals.networking_phone, device->addr_len, device->prefix, length, device->suffix );
+    if( ! packet ){
+        rwlock_read_unlock( & arp_globals.lock );
         return NULL;
+    }
-    packet = packet_get_5( arp_globals.networking_phone, SERVICE_ARP, device->addr_len, device->prefix, length, device->suffix );
-    if( ! packet ) return NULL;
     header = ( arp_header_ref ) packet_suffix( packet, length );
     header->hardware = device->hardware;
     header->hardware_length = device->addr->length;
     header->protocol = protocol_map( device->service, protocol );
     header->protocol_length = proto->addr->length;
     header->operation = ARPOP_REQUEST;
     length = sizeof( arp_header_t );
     memcpy((( uint8_t * ) header ) + length, device->addr->value, device->addr->length );
     length += device->addr->length;
     memcpy((( uint8_t * ) header ) + length, proto->addr->value, proto->addr->length );
     length += proto->addr->length;
     memset((( uint8_t * ) header ) + length, 0, device->addr->length );
     length += device->addr->length;
     memcpy((( uint8_t * ) header ) + length, target->value, target->length );
     packet_set_addr( packet, ( uint8_t * ) device->addr->value, ( uint8_t * ) device->broadcast_addr->value, CONVERT_SIZE( char, uint8_t, device->addr->length ));
     async_msg_3( device->phone, NET_NETIF_SEND, device_id, SERVICE_ARP, packet_get_id( packet ));
+    rwlock_read_unlock( & arp_globals.lock );
     return NULL;
+}
 int arp_receive_message( device_id_t device_id, packet_t packet ){
     ERROR_DECLARE;
     size_t              length;
     arp_header_ref      header;
     arp_device_ref      device;
     arp_proto_ref       proto;
-//  arp_addr_ref        addr;
     measured_string_ref hw_source;
-/*  measured_string_t   proto_target;
-    aid_t               message;
-    ipcarg_t            result;
-    int                 index;
-    ipc_call_t          answer;
-*/  uint8_t *           src_hw;
+    uint8_t *           src_hw;
     uint8_t *           src_proto;
     uint8_t *           des_hw;
     uint8_t *           des_proto;
     length = packet_get_data_length( packet );
     if( length <= sizeof( arp_header_t )) return EINVAL;
+    rwlock_read_lock( & arp_globals.lock );
     device = arp_cache_find( & arp_globals.cache, device_id );
+    if( ! device ){
+        rwlock_read_unlock( & arp_globals.lock );
-    if( ! device ) return ENOENT;
+        return ENOENT;
+    }
     header = ( arp_header_ref ) packet_get_data( packet );
-    if( header->hardware != device->hardware ) return EINVAL;
+    if(( header->hardware != device->hardware )
-    if( length < sizeof( arp_header_t ) + ( header->hardware_length + header->protocol_length ) * 2 ) return EINVAL;
+    || ( length < sizeof( arp_header_t ) + ( header->hardware_length + header->protocol_length ) * 2 )){
+        rwlock_read_unlock( & arp_globals.lock );
+        return EINVAL;
+    }
     proto = arp_protos_find( & device->protos, protocol_unmap( device->service, header->protocol ));
+    if( ! proto ){
+        rwlock_read_unlock( & arp_globals.lock );
-    if( ! proto ) return ENOENT;
+        return ENOENT;
+    }
     src_hw = (( uint8_t * ) header ) + sizeof( arp_header_t );
     src_proto = src_hw + header->hardware_length;
     des_hw = src_proto + header->protocol_length;
     des_proto = des_hw + header->hardware_length;
     hw_source = arp_addr_find( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ));
     // exists?
     if( hw_source ){
-        if( hw_source->length != CONVERT_SIZE( uint8_t, char, header->hardware_length )) return EINVAL;
+        if( hw_source->length != CONVERT_SIZE( uint8_t, char, header->hardware_length )){
+            rwlock_read_unlock( & arp_globals.lock );
+            return EINVAL;
+        }
         memcpy( hw_source->value, src_hw, hw_source->length );
+    }
     // is my protocol address?
-    // TODO query protocol module?
-/*  proto_target.value = des_proto;
-    proto_target.length = header->protocol_length;
+    if( proto->addr->length != CONVERT_SIZE( uint8_t, char, header->hardware_length )){
-    // TODO send necessary?
-    message = async_send_0( proto->phone, NET_IL_MY_ADDR, & answer );
-    if( ERROR_OCCURRED( measured_strings_send( device->phone, & proto_target, 1 ))){
-        async_wait_for( message, NULL );
+        rwlock_read_unlock( & arp_globals.lock );
-        return ERROR_CODE;
+        return EINVAL;
+    }
-    async_wait_for( message, & result );
-    if( result == EOK ){
-*/  if( proto->addr->length != CONVERT_SIZE( uint8_t, char, header->hardware_length )) return EINVAL;
     if( ! strncmp( proto->addr->value, ( char * ) des_proto, proto->addr->length )){
         // not already upadted?
         if( ! hw_source ){
             hw_source = measured_string_create_bulk(( char * ) src_hw, CONVERT_SIZE( uint8_t, char, header->hardware_length ));
-            if( ! hw_source ) return ENOMEM;
+            if( ! hw_source ){
+                rwlock_read_unlock( & arp_globals.lock );
+                return ENOMEM;
+            }
-            ERROR_PROPAGATE( arp_addr_add( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ), hw_source ));
+            if( ERROR_OCCURRED( arp_addr_add( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ), hw_source ))){
+                rwlock_read_unlock( & arp_globals.lock );
+                return ERROR_CODE;
+            }
+        }
         if( header->operation == ARPOP_REQUEST ){
             header->operation = ARPOP_REPLY;
-/*          for( index = 0; index + header->hardware_length < header->protocol_length; index += header->hardware_length ){
-                memcpy( src_hw, src_proto + index, header->hardware_length );
-                memcpy( src_proto + index, des_proto + index, header->hardware_length );
-                memcpy( des_proto + index, src_hw, header->hardware_length );
-            }
-            memcpy( src_hw, src_proto + index, header->hardware_length - header->protocol_length );
-            memcpy( src_proto + index, des_proto + index, header->hardware_length - header->protocol_length );
-            memcpy( des_proto + index, src_hw, header->hardware_length - header->protocol_length );
-            memcpy( src_hw, des_hw, header->hardware_length );
-            memcpy( des_hw, hw_source->value, hw_source->length );
-*/          memcpy( des_proto, src_proto, header->protocol_length );
+            memcpy( des_proto, src_proto, header->protocol_length );
             memcpy( src_proto, proto->addr->value, header->protocol_length );
             memcpy( src_hw, des_hw, header->hardware_length );
             memcpy( des_hw, hw_source->value, header->hardware_length );
             packet_set_addr( packet, src_hw, des_hw, header->hardware_length );
             async_msg_3( device->phone, NET_NETIF_SEND, device_id, SERVICE_ARP, packet_get_id( packet ));
+            rwlock_read_unlock( & arp_globals.lock );
         }else{
+            rwlock_read_unlock( & arp_globals.lock );
             packet_release( arp_globals.networking_phone, packet_get_id( packet ));
+        }
+    }
     return EOK;
+}
 int arp_clear_device_message( device_id_t device_id ){
     arp_device_ref  device;
+    rwlock_write_lock( & arp_globals.lock );
     device = arp_cache_find( & arp_globals.cache, device_id );
+    if( ! device ){
+        rwlock_write_unlock( & arp_globals.lock );
-    if( ! device ) return ENOENT;
+        return ENOENT;
+    }
     clear_device( device );
+    rwlock_write_unlock( & arp_globals.lock );
     return EOK;
+}
 void clear_device( arp_device_ref device ){
     int             count;
     arp_proto_ref   proto;
     count = arp_protos_count( & device->protos );
     while( count > 0 ){
         proto = arp_protos_get_index( & device->protos, count );
         if( proto->addr ) free( proto->addr );
         if( proto->addr_data ) free( proto->addr_data );
         arp_addr_destroy( & proto->addresses );
         -- count;
+    }
     arp_protos_clear( & device->protos );
+}
 int arp_clean_cache_message( void ){
     int             count;
     arp_device_ref  device;
+    rwlock_write_lock( & arp_globals.lock );
     count = arp_cache_count( & arp_globals.cache );
     while( count > 0 ){
         device = arp_cache_get_index( & arp_globals.cache, count );
         if( device ){
             clear_device( device );
             if( device->addr_data ) free( device->addr_data );
             if( device->broadcast_data ) free( device->broadcast_data );
+        }
+    }
     arp_cache_clear( & arp_globals.cache );
+    rwlock_write_lock( & arp_globals.lock );
     return EOK;
+}
 int arp_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
     ERROR_DECLARE;
     measured_string_ref address;
     measured_string_ref translation;
     char *              data;
     * answer_count = 0;
     switch( IPC_GET_METHOD( * call )){
         case IPC_M_PHONE_HUNGUP:
             return EOK;
         case NET_ARP_DEVICE:
             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
             if( ERROR_OCCURRED( arp_device_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), IPC_GET_PROTO( call ), address ))){
                 free( address );
                 free( data );
+            }
             return ERROR_CODE;
         case NET_ARP_TRANSLATE:
             ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));
             translation = arp_translate_message( IPC_GET_DEVICE( call ), IPC_GET_PROTO( call ), address );
             free( address );
             free( data );
             if( ! translation ) return ENOENT;
             return measured_strings_reply( translation, 1 );
         case NET_ARP_CLEAR_DEVICE:
             return arp_clear_device_message( IPC_GET_DEVICE( call ));
         case NET_ARP_CLEAN_CACHE:
             return arp_clean_cache_message();
+    }
     return ENOTSUP;
+}
 void arp_receiver( ipc_callid_t iid, ipc_call_t * icall ){
     ERROR_DECLARE;
     packet_t        packet;
     while( true ){
         switch( IPC_GET_METHOD( * icall )){
             case NET_IL_DEVICE_STATE:
-                //TODO clear device if off?
+                // do nothing - keep the cache
+                ipc_answer_0( iid, EOK );
                 break;
             case NET_IL_RECEIVED:
                 if( ! ERROR_OCCURRED( packet_translate( arp_globals.networking_phone, & packet, IPC_GET_PACKET( icall )))){
                     ERROR_CODE = arp_receive_message( IPC_GET_DEVICE( icall ), packet );
+                }
                 ipc_answer_0( iid, ERROR_CODE );
                 break;
             default:
                 ipc_answer_0( iid, ENOTSUP );
+        }
         iid = async_get_call( icall );
+    }
+}
 /** @}
  */

Subversion Repositories HelenOS

(root)/branches/network/uspace/srv/net/il/arp/arp.c – Rev 3912 → 3991