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Diffstat (limited to 'nuttx/net/uip/uip_arp.c')
| -rw-r--r-- | nuttx/net/uip/uip_arp.c | 431 |
1 files changed, 0 insertions, 431 deletions
diff --git a/nuttx/net/uip/uip_arp.c b/nuttx/net/uip/uip_arp.c deleted file mode 100644 index c731ff0de..000000000 --- a/nuttx/net/uip/uip_arp.c +++ /dev/null @@ -1,431 +0,0 @@ -/**************************************************************************** - * net/uip/uip_arp.c - * Implementation of the ARP Address Resolution Protocol. - * - * Copyright (C) 2007-2011 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * Based on uIP which also has a BSD style license: - * - * Author: Adam Dunkels <adam@dunkels.com> - * Copyright (c) 2001-2003, Adam Dunkels. - * All rights reserved. - * - * 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. 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. - * - ****************************************************************************/ - -/* 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 <nuttx/config.h> -#ifdef CONFIG_NET - -#include <sys/ioctl.h> -#include <stdint.h> -#include <string.h> -#include <debug.h> - -#include <netinet/in.h> - -#include <net/ethernet.h> -#include <nuttx/net/uip/uipopt.h> -#include <nuttx/net/uip/uip-arch.h> -#include <nuttx/net/uip/uip-arp.h> - -#ifdef CONFIG_NET_ARP - -/**************************************************************************** - * Pre-processor Definitions - ****************************************************************************/ - -#define ARP_REQUEST 1 -#define ARP_REPLY 2 - -#define ARP_HWTYPE_ETH 1 - -#define RASIZE 4 /* Size of ROUTER ALERT */ - -#define ETHBUF ((struct uip_eth_hdr *)&dev->d_buf[0]) -#define ARPBUF ((struct arp_hdr_s *)&dev->d_buf[UIP_LLH_LEN]) -#define IPBUF ((struct arp_iphdr_s *)&dev->d_buf[UIP_LLH_LEN]) - -/**************************************************************************** - * Private 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) */ -}; - -/**************************************************************************** - * Private Data - ****************************************************************************/ - -/* Support for broadcast address */ - -static const struct ether_addr g_broadcast_ethaddr = - {{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}}; -static const uint16_t g_broadcast_ipaddr[2] = {0xffff, 0xffff}; - -/* Support for IGMP multicast addresses. - * - * Well-known ethernet multicast address: - * - * ADDRESS TYPE USAGE - * 01-00-0c-cc-cc-cc 0x0802 CDP (Cisco Discovery Protocol), VTP (Virtual Trunking Protocol) - * 01-00-0c-cc-cc-cd 0x0802 Cisco Shared Spanning Tree Protocol Address - * 01-80-c2-00-00-00 0x0802 Spanning Tree Protocol (for bridges) IEEE 802.1D - * 01-80-c2-00-00-02 0x0809 Ethernet OAM Protocol IEEE 802.3ah - * 01-00-5e-xx-xx-xx 0x0800 IPv4 IGMP Multicast Address - * 33-33-00-00-00-00 0x86DD IPv6 Neighbor Discovery - * 33-33-xx-xx-xx-xx 0x86DD IPv6 Multicast Address (RFC3307) - * - * The following is the first three octects of the IGMP address: - */ - -#if defined(CONFIG_NET_IGMP) && !defined(CONFIG_NET_IPv6) -static const uint8_t g_multicast_ethaddr[3] = {0x01, 0x00, 0x5e}; -#endif - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -#if defined(CONFIG_NET_DUMPARP) && defined(CONFIG_DEBUG) -static void uip_arp_dump(struct arp_hdr_s *arp) -{ - nlldbg(" HW type: %04x Protocol: %04x\n", - arp->ah_hwtype, arp->ah_protocol);\ - nlldbg(" HW len: %02x Proto len: %02x Operation: %04x\n", - arp->ah_hwlen, arp->ah_protolen, arp->ah_opcode); - nlldbg(" Sender MAC: %02x:%02x:%02x:%02x:%02x:%02x IP: %d.%d.%d.%d\n", - arp->ah_shwaddr[0], arp->ah_shwaddr[1], arp->ah_shwaddr[2], - arp->ah_shwaddr[3], arp->ah_shwaddr[4], arp->ah_shwaddr[5], - arp->ah_sipaddr[0] & 0xff, arp->ah_sipaddr[0] >> 8, - arp->ah_sipaddr[1] & 0xff, arp->ah_sipaddr[1] >> 8); - nlldbg(" Dest MAC: %02x:%02x:%02x:%02x:%02x:%02x IP: %d.%d.%d.%d\n", - arp->ah_dhwaddr[0], arp->ah_dhwaddr[1], arp->ah_dhwaddr[2], - arp->ah_dhwaddr[3], arp->ah_dhwaddr[4], arp->ah_dhwaddr[5], - arp->ah_dipaddr[0] & 0xff, arp->ah_dipaddr[0] >> 8, - arp->ah_dipaddr[1] & 0xff, arp->ah_dipaddr[1] >> 8); -} -#else -# define uip_arp_dump(arp) -#endif - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/* ARP processing for incoming IP packets - * - * This function should be called by the device driver when an IP packet has - * been received. The function will check if the address is in the ARP cache, - * and if so the ARP cache entry will be refreshed. If no ARP cache entry was - * found, a new one is created. - * - * This function expects an IP packet with a prepended Ethernet header in the - * d_buf[] buffer, and the length of the packet in the variable d_len. - */ - -#ifdef CONFIG_NET_ARP_IPIN -void uip_arp_ipin(struct uip_driver_s *dev) -{ - in_addr_t srcipaddr; - - /* Only insert/update an entry if the source IP address of the incoming IP - * packet comes from a host on the local network. - */ - - srcipaddr = uip_ip4addr_conv(IPBUF->eh_srcipaddr); - if (!uip_ipaddr_maskcmp(srcipaddr, dev->d_ipaddr, dev->d_netmask)) - { - uip_arp_update(IPBUF->eh_srcipaddr, ETHBUF->src); - } -} -#endif /* CONFIG_NET_ARP_IPIN */ - -/* ARP processing for incoming ARP packets. - * - * This function should be called by the device driver when an ARP - * packet has been received. The function will act differently - * depending on the ARP packet type: if it is a reply for a request - * that we previously sent out, the ARP cache will be filled in with - * the values from the ARP reply. If the incoming ARP packet is an ARP - * request for our IP address, an ARP reply packet is created and put - * into the d_buf[] buffer. - * - * When the function returns, the value of the field d_len - * indicates whether the device driver should send out a packet or - * not. If d_len is zero, no packet should be sent. If d_len is - * non-zero, it contains the length of the outbound packet that is - * present in the d_buf[] buffer. - * - * This function expects an ARP packet with a prepended Ethernet - * header in the d_buf[] buffer, and the length of the packet in the - * variable d_len. - */ - -void uip_arp_arpin(struct uip_driver_s *dev) -{ - struct arp_hdr_s *parp = ARPBUF; - in_addr_t ipaddr; - - if (dev->d_len < (sizeof(struct arp_hdr_s) + UIP_LLH_LEN)) - { - nlldbg("Too small\n"); - dev->d_len = 0; - return; - } - dev->d_len = 0; - - ipaddr = uip_ip4addr_conv(parp->ah_dipaddr); - switch(parp->ah_opcode) - { - case HTONS(ARP_REQUEST): - nllvdbg("ARP request for IP %04lx\n", (long)ipaddr); - - /* ARP request. If it asked for our address, we send out a reply. */ - - if (uip_ipaddr_cmp(ipaddr, dev->d_ipaddr)) - { - struct uip_eth_hdr *peth = ETHBUF; - - /* First, we register the one who made the request in our ARP - * table, since it is likely that we will do more communication - * with this host in the future. - */ - - uip_arp_update(parp->ah_sipaddr, parp->ah_shwaddr); - - parp->ah_opcode = HTONS(ARP_REPLY); - memcpy(parp->ah_dhwaddr, parp->ah_shwaddr, ETHER_ADDR_LEN); - memcpy(parp->ah_shwaddr, dev->d_mac.ether_addr_octet, ETHER_ADDR_LEN); - memcpy(peth->src, dev->d_mac.ether_addr_octet, ETHER_ADDR_LEN); - memcpy(peth->dest, parp->ah_dhwaddr, ETHER_ADDR_LEN); - - parp->ah_dipaddr[0] = parp->ah_sipaddr[0]; - parp->ah_dipaddr[1] = parp->ah_sipaddr[1]; - uiphdr_ipaddr_copy(parp->ah_sipaddr, &dev->d_ipaddr); - uip_arp_dump(parp); - - peth->type = HTONS(UIP_ETHTYPE_ARP); - dev->d_len = sizeof(struct arp_hdr_s) + UIP_LLH_LEN; - } - break; - - case HTONS(ARP_REPLY): - nllvdbg("ARP reply for IP %04lx\n", (long)ipaddr); - - /* ARP reply. We insert or update the ARP table if it was meant - * for us. - */ - - if (uip_ipaddr_cmp(ipaddr, dev->d_ipaddr)) - { - uip_arp_update(parp->ah_sipaddr, parp->ah_shwaddr); - } - break; - } -} - -/* Prepend Ethernet header to an outbound IP packet and see if we need - * to send out an ARP request. - * - * This function should be called before sending out an IP packet. The - * function checks the destination IP address of the IP packet to see - * what Ethernet MAC address that should be used as a destination MAC - * address on the Ethernet. - * - * If the destination IP address is in the local network (determined - * by logical ANDing of netmask and our IP address), the function - * checks the ARP cache to see if an entry for the destination IP - * address is found. If so, an Ethernet header is prepended and the - * function returns. If no ARP cache entry is found for the - * destination IP address, the packet in the d_buf[] is replaced by - * an ARP request packet for the IP address. The IP packet is dropped - * and it is assumed that they higher level protocols (e.g., TCP) - * eventually will retransmit the dropped packet. - * - * If the destination IP address is not on the local network, the IP - * address of the default router is used instead. - * - * When the function returns, a packet is present in the d_buf[] - * buffer, and the length of the packet is in the field d_len. - */ - -void uip_arp_out(struct uip_driver_s *dev) -{ - const struct arp_entry *tabptr = NULL; - struct arp_hdr_s *parp = ARPBUF; - struct uip_eth_hdr *peth = ETHBUF; - struct arp_iphdr_s *pip = IPBUF; - in_addr_t ipaddr; - in_addr_t destipaddr; - - /* Find the destination IP address in the ARP table and construct - * the Ethernet header. If the destination IP addres isn't on the - * local network, we use the default router's IP address instead. - * - * If not ARP table entry is found, we overwrite the original IP - * packet with an ARP request for the IP address. - */ - - /* First check if destination is a local broadcast. */ - - if (uiphdr_ipaddr_cmp(pip->eh_destipaddr, g_broadcast_ipaddr)) - { - memcpy(peth->dest, g_broadcast_ethaddr.ether_addr_octet, ETHER_ADDR_LEN); - } -#if defined(CONFIG_NET_IGMP) && !defined(CONFIG_NET_IPv6) - /* Check if the destination address is a multicast address - * - * - IPv4: multicast addresses lie in the class D group -- The address range - * 224.0.0.0 to 239.255.255.255 (224.0.0.0/4) - * - * - IPv6 multicast addresses are have the high-order octet of the - * addresses=0xff (ff00::/8.) - */ - - else if (NTOHS(pip->eh_destipaddr[0]) >= 0xe000 && - NTOHS(pip->eh_destipaddr[0]) <= 0xefff) - { - /* Build the well-known IPv4 IGMP ethernet address. The first - * three bytes are fixed; the final three variable come from the - * last three bytes of the IP address. - */ - - const uint8_t *ip = ((uint8_t*)pip->eh_destipaddr) + 1; - memcpy(peth->dest, g_multicast_ethaddr, 3); - memcpy(&peth->dest[3], ip, 3); - } -#endif - else - { - /* Check if the destination address is on the local network. */ - - destipaddr = uip_ip4addr_conv(pip->eh_destipaddr); - if (!uip_ipaddr_maskcmp(destipaddr, dev->d_ipaddr, dev->d_netmask)) - { - /* Destination address was not on the local network, so we need to - * use the default router's IP address instead of the destination - * address when determining the MAC address. - */ - - uip_ipaddr_copy(ipaddr, dev->d_draddr); - } - else - { - /* Else, we use the destination IP address. */ - - uip_ipaddr_copy(ipaddr, destipaddr); - } - - /* Check if we already have this destination address in the ARP table */ - - tabptr = uip_arp_find(ipaddr); - if (!tabptr) - { - nllvdbg("ARP request for IP %04lx\n", (long)ipaddr); - - /* The destination address was not in our ARP table, so we - * overwrite the IP packet with an ARP request. - */ - - memset(peth->dest, 0xff, ETHER_ADDR_LEN); - memset(parp->ah_dhwaddr, 0x00, ETHER_ADDR_LEN); - memcpy(peth->src, dev->d_mac.ether_addr_octet, ETHER_ADDR_LEN); - memcpy(parp->ah_shwaddr, dev->d_mac.ether_addr_octet, ETHER_ADDR_LEN); - - uiphdr_ipaddr_copy(parp->ah_dipaddr, &ipaddr); - uiphdr_ipaddr_copy(parp->ah_sipaddr, &dev->d_ipaddr); - - parp->ah_opcode = HTONS(ARP_REQUEST); - parp->ah_hwtype = HTONS(ARP_HWTYPE_ETH); - parp->ah_protocol = HTONS(UIP_ETHTYPE_IP); - parp->ah_hwlen = ETHER_ADDR_LEN; - parp->ah_protolen = 4; - uip_arp_dump(parp); - - peth->type = HTONS(UIP_ETHTYPE_ARP); - dev->d_len = sizeof(struct arp_hdr_s) + UIP_LLH_LEN; - return; - } - - /* Build an ethernet header. */ - - memcpy(peth->dest, tabptr->at_ethaddr.ether_addr_octet, ETHER_ADDR_LEN); - } - - /* Finish populating the ethernet header */ - - memcpy(peth->src, dev->d_mac.ether_addr_octet, ETHER_ADDR_LEN); - peth->type = HTONS(UIP_ETHTYPE_IP); - dev->d_len += UIP_LLH_LEN; -} - -#endif /* CONFIG_NET_ARP */ -#endif /* CONFIG_NET */ |