/**************************************************************************** * net/arp/arp.h * * Copyright (C) 2014 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "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 * COPYRIGHT OWNER OR CONTRIBUTORS 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. * ****************************************************************************/ #ifndef __NET_ARP_ARP_H #define __NET_ARP_ARP_H /* The Address Resolution Protocol ARP is used for mapping between IP * addresses and link level addresses such as the Ethernet MAC * addresses. ARP uses broadcast queries to ask for the link level * address of a known IP address and the host which is configured with * the IP address for which the query was meant, will respond with its * link level address. * * Note: This ARP implementation only supports Ethernet. */ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Configuration ************************************************************/ #ifndef CONFIG_DEBUG # undef CONFIG_NET_ARP_DUMP #endif /* ARP Definitions **********************************************************/ #define ARP_REQUEST 1 #define ARP_REPLY 2 #define ARP_HWTYPE_ETH 1 #define RASIZE 4 /* Size of ROUTER ALERT */ /**************************************************************************** * Public Types ****************************************************************************/ /* ARP header -- Size 28 bytes */ struct arp_hdr_s { uint16_t ah_hwtype; /* 16-bit Hardware type (Ethernet=0x001) */ uint16_t ah_protocol; /* 16-bit Protocol type (IP=0x0800) */ uint8_t ah_hwlen; /* 8-bit Hardware address size (6) */ uint8_t ah_protolen; /* 8-bit Procotol address size (4) */ uint16_t ah_opcode; /* 16-bit Operation */ uint8_t ah_shwaddr[6]; /* 48-bit Sender hardware address */ uint16_t ah_sipaddr[2]; /* 32-bit Sender IP adress */ uint8_t ah_dhwaddr[6]; /* 48-bit Target hardware address */ uint16_t ah_dipaddr[2]; /* 32-bit Target IP address */ }; /* IP header -- Size 20 or 24 bytes */ struct arp_iphdr_s { uint8_t eh_vhl; /* 8-bit Version (4) and header length (5 or 6) */ uint8_t eh_tos; /* 8-bit Type of service (e.g., 6=TCP) */ uint8_t eh_len[2]; /* 16-bit Total length */ uint8_t eh_ipid[2]; /* 16-bit Identification */ uint8_t eh_ipoffset[2]; /* 16-bit IP flags + fragment offset */ uint8_t eh_ttl; /* 8-bit Time to Live */ uint8_t eh_proto; /* 8-bit Protocol */ uint16_t eh_ipchksum; /* 16-bit Header checksum */ uint16_t eh_srcipaddr[2]; /* 32-bit Source IP address */ uint16_t eh_destipaddr[2]; /* 32-bit Destination IP address */ uint16_t eh_ipoption[2]; /* (optional) */ }; /**************************************************************************** * Public Function Prototypes ****************************************************************************/ #ifdef CONFIG_NET_ARP /**************************************************************************** * Name: arp_reset * * Description: * Re-initialize the ARP table. * ****************************************************************************/ void arp_reset(void); /**************************************************************************** * Function: arp_timer_initialize * * Description: * Initialized the 10 second timer that is need by the ARP logic in order * to age ARP address associations * * Parameters: * None * * Returned Value: * None * * Assumptions: * Called once at system initialization time * ****************************************************************************/ void arp_timer_initialize(void); /**************************************************************************** * Name: arp_timer * * Description: * This function performs periodic timer processing in the ARP module * and should be called at regular intervals. The recommended interval * is 10 seconds between the calls. It is responsible for flushing old * entries in the ARP table. * ****************************************************************************/ void arp_timer(void); /**************************************************************************** * Name: arp_format * * Description: * Format an ARP packet. * * Input Parameters: * dev - Device structure * ipaddr - Target IP address (32-bit) * * Returned Value: * None * ****************************************************************************/ struct net_driver_s; /* Forward reference */ void arp_format(FAR struct net_driver_s *dev, in_addr_t ipaddr); /**************************************************************************** * Name: arp_dump * * Description: * Dump the contents of an ARP packet to the SYSLOG device * * Input Parameters: * arp - A reference to the ARP header to be dumped. * * Returned Value: * None * ****************************************************************************/ #ifdef CONFIG_NET_ARP_DUMP void arp_dump(FAR struct arp_hdr_s *arp); #else # define arp_dump(arp) #endif #else /* CONFIG_NET_ARP */ /* If ARP is disabled, stub out all ARP interfaces */ # define arp_reset() # define arp_timer_initialize(void) # define arp_timer() # define arp_dump(arp) #endif /* CONFIG_NET_ARP */ #endif /* __NET_ARP_ARP_H */