1 | //////////////////////////////////////////////////////////////////////////////// |
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2 | // Copyright (c) 2004 Xilinx, Inc. All rights reserved. |
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3 | // |
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4 | // Xilinx, Inc. |
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5 | // XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" AS A |
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6 | // COURTESY TO YOU. BY PROVIDING THIS DESIGN, CODE, OR INFORMATION AS |
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7 | // ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, APPLICATION OR |
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8 | // STANDARD, XILINX IS MAKING NO REPRESENTATION THAT THIS IMPLEMENTATION |
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9 | // IS FREE FROM ANY CLAIMS OF INFRINGEMENT, AND YOU ARE RESPONSIBLE |
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10 | // FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE FOR YOUR IMPLEMENTATION. |
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11 | // XILINX EXPRESSLY DISCLAIMS ANY WARRANTY WHATSOEVER WITH RESPECT TO |
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12 | // THE ADEQUACY OF THE IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO |
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13 | // ANY WARRANTIES OR REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE |
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14 | // FROM CLAIMS OF INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY |
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15 | // AND FITNESS FOR A PARTICULAR PURPOSE. |
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16 | // |
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17 | // File : arp.c |
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18 | // Date : 2002, March 20. |
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19 | // Author : Sathya Thammanur |
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20 | // Company: Xilinx |
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21 | // Group : Emerging Software Technologies |
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22 | // |
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23 | // Summary: |
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24 | // ARP layer specific functions |
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25 | // |
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26 | // $Id: arp.c,v 1.2.8.6 2005/11/15 23:41:10 salindac Exp $ |
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27 | // |
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28 | //////////////////////////////////////////////////////////////////////////////// |
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29 | |
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30 | //////////////////////////////////////////////////////////////////////////////// |
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31 | // see copyright.txt for Rice University/Mango Communications modifications |
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32 | //////////////////////////////////////////////////////////////////////////////// |
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33 | |
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34 | #include <xilnet_xilsock.h> |
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35 | |
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36 | /* |
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37 | * xilnet_arp: handler for arp packets |
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38 | */ |
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39 | |
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40 | int xilnet_arp(unsigned char *buf, int len) { |
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41 | |
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42 | struct xilnet_arp_pkt* ar = (struct xilnet_arp_pkt*) (buf+ETH_HDR_LEN); |
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43 | |
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44 | // Analyse if its a arp request and send a reply if needed |
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45 | if (ar->hdr.hard_type == ARP_HARD_TYPE_ETH && ar->hdr.prot_type == ETH_PROTO_IP && |
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46 | ar->hdr.hard_size == ARP_HARD_SIZE && ar->hdr.prot_size == ARP_PROTO_IP_SIZE && |
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47 | (ar->target_ip[0] == mb_ip_addr[0] && ar->target_ip[1] == mb_ip_addr[1] && |
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48 | ar->target_ip[2] == mb_ip_addr[2] && ar->target_ip[3] == mb_ip_addr[3]) ) { |
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49 | if (ar->hdr.op == ARP_REQ) { |
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50 | // update hw addr table |
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51 | xilnet_eth_update_hw_tbl(buf, ETH_PROTO_ARP); |
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52 | xilnet_arp_reply(buf+ETH_HDR_LEN, len-ETH_HDR_LEN); |
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53 | } |
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54 | } |
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55 | return 0; |
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56 | } |
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57 | |
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58 | |
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59 | /* |
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60 | * xilnet_arp_reply: |
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61 | */ |
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62 | |
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63 | void xilnet_arp_reply(unsigned char *buf, int len) { |
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64 | |
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65 | int i; |
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66 | struct xilnet_arp_pkt *pkt; |
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67 | struct xilnet_arp_pkt *arp_req = (struct xilnet_arp_pkt*) buf; |
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68 | struct xilnet_arp_pkt *arp_reply; |
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69 | #ifdef _DEBUG_ |
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70 | // print("arp_reply(): \n"); |
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71 | #endif |
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72 | pkt = (struct xilnet_arp_pkt*)(sendbuf+ETH_HDR_LEN); |
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73 | |
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74 | pkt->hdr.hard_type = ARP_HARD_TYPE_ETH; |
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75 | pkt->hdr.prot_type = ETH_PROTO_IP; |
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76 | pkt->hdr.hard_size = ARP_HARD_SIZE; |
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77 | pkt->hdr.prot_size = ARP_PROTO_IP_SIZE; |
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78 | pkt->hdr.op = ARP_REPLY; |
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79 | |
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80 | for (i = 0; i < ETH_ADDR_LEN; i++) { |
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81 | pkt->sender_hw[i] = mb_hw_addr[i]; |
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82 | pkt->target_hw[i] = arp_req->sender_hw[i]; |
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83 | } |
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84 | |
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85 | for (i = 0; i < ARP_PROTO_IP_SIZE ; i++) { |
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86 | pkt->sender_ip[i] = mb_ip_addr[i]; |
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87 | pkt->target_ip[i] = arp_req->sender_ip[i]; |
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88 | } |
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89 | memset(pkt->pad, 0, ARP_PAD_SIZE); |
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90 | |
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91 | /* initialize ethernet header */ |
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92 | xilnet_eth_send_frame(sendbuf, ETH_MIN_FRAME_LEN, arp_req->sender_ip, pkt->target_hw, ETH_PROTO_ARP); |
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93 | |
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94 | } |
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95 | |
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96 | /* |
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97 | * xilnet_arp_reply: |
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98 | */ |
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99 | |
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100 | void xilnet_arp_announce() { |
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101 | |
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102 | unsigned char bcast_addr[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
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103 | |
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104 | int i; |
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105 | struct xilnet_arp_pkt *pkt; |
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106 | struct xilnet_arp_pkt *arp_reply; |
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107 | #ifdef _DEBUG_ |
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108 | // print("announce(): \n"); |
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109 | #endif |
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110 | pkt = (struct xilnet_arp_pkt*)(sendbuf+ETH_HDR_LEN); |
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111 | |
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112 | pkt->hdr.hard_type = ARP_HARD_TYPE_ETH; |
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113 | pkt->hdr.prot_type = ETH_PROTO_IP; |
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114 | pkt->hdr.hard_size = ARP_HARD_SIZE; |
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115 | pkt->hdr.prot_size = ARP_PROTO_IP_SIZE; |
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116 | pkt->hdr.op = ARP_REPLY; |
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117 | |
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118 | for (i = 0; i < ETH_ADDR_LEN; i++) { |
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119 | pkt->sender_hw[i] = mb_hw_addr[i]; |
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120 | pkt->target_hw[i] = 0xFF; |
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121 | } |
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122 | |
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123 | for (i = 0; i < ARP_PROTO_IP_SIZE ; i++) { |
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124 | pkt->sender_ip[i] = mb_ip_addr[i]; |
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125 | pkt->target_ip[i] = 0xFF; |
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126 | } |
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127 | memset(pkt->pad, 0, ARP_PAD_SIZE); |
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128 | |
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129 | xil_printf("xilnet_arp_announce: Sending arp announce\r\n"); |
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130 | /* initialize ethernet header */ |
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131 | xilnet_eth_send_frame(sendbuf, ETH_MIN_FRAME_LEN, NULL, (void *)&bcast_addr, ETH_PROTO_ARP); |
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132 | |
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133 | } |
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