1 | /**
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2 | * @file
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3 | * Ethernet Interface Skeleton
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4 | *
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5 | */
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6 |
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7 | /*
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8 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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9 | * All rights reserved.
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10 | *
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11 | * Redistribution and use in source and binary forms, with or without modification,
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12 | * are permitted provided that the following conditions are met:
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13 | *
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14 | * 1. Redistributions of source code must retain the above copyright notice,
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15 | * this list of conditions and the following disclaimer.
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16 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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17 | * this list of conditions and the following disclaimer in the documentation
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18 | * and/or other materials provided with the distribution.
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19 | * 3. The name of the author may not be used to endorse or promote products
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20 | * derived from this software without specific prior written permission.
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21 | *
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22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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25 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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27 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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30 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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31 | * OF SUCH DAMAGE.
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32 | *
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33 | * This file is part of the lwIP TCP/IP stack.
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34 | *
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35 | * Author: Adam Dunkels <adam@sics.se>
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36 | *
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37 | */
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38 |
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39 | /*
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40 | * This file is a skeleton for developing Ethernet network interface
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41 | * drivers for lwIP. Add code to the low_level functions and do a
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42 | * search-and-replace for the word "ethernetif" to replace it with
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43 | * something that better describes your network interface.
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44 | */
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45 |
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46 | #include "lwip/opt.h"
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47 |
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48 | #if 0 /* don't build, this is only a skeleton, see previous comment */
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49 |
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50 | #include "lwip/def.h"
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51 | #include "lwip/mem.h"
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52 | #include "lwip/pbuf.h"
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53 | #include "lwip/stats.h"
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54 | #include "lwip/snmp.h"
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55 | #include "lwip/ethip6.h"
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56 | #include "lwip/etharp.h"
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57 | #include "netif/ppp/pppoe.h"
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58 |
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59 | /* Define those to better describe your network interface. */
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60 | #define IFNAME0 'e'
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61 | #define IFNAME1 'n'
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62 |
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63 | /**
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64 | * Helper struct to hold private data used to operate your ethernet interface.
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65 | * Keeping the ethernet address of the MAC in this struct is not necessary
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66 | * as it is already kept in the struct netif.
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67 | * But this is only an example, anyway...
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68 | */
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69 | struct ethernetif {
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70 | struct eth_addr *ethaddr;
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71 | /* Add whatever per-interface state that is needed here. */
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72 | };
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73 |
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74 | /* Forward declarations. */
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75 | static void ethernetif_input(struct netif *netif);
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76 |
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77 | /**
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78 | * In this function, the hardware should be initialized.
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79 | * Called from ethernetif_init().
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80 | *
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81 | * @param netif the already initialized lwip network interface structure
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82 | * for this ethernetif
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83 | */
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84 | static void
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85 | low_level_init(struct netif *netif)
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86 | {
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87 | struct ethernetif *ethernetif = netif->state;
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88 |
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89 | /* set MAC hardware address length */
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90 | netif->hwaddr_len = ETHARP_HWADDR_LEN;
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91 |
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92 | /* set MAC hardware address */
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93 | netif->hwaddr[0] = ;
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94 | ...
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95 | netif->hwaddr[5] = ;
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96 |
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97 | /* maximum transfer unit */
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98 | netif->mtu = 1500;
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99 |
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100 | /* device capabilities */
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101 | /* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */
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102 | netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_LINK_UP;
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103 |
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104 | #if LWIP_IPV6 && LWIP_IPV6_MLD
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105 | /*
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106 | * For hardware/netifs that implement MAC filtering.
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107 | * All-nodes link-local is handled by default, so we must let the hardware know
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108 | * to allow multicast packets in.
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109 | * Should set mld_mac_filter previously. */
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110 | if (netif->mld_mac_filter != NULL) {
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111 | ip6_addr_t ip6_allnodes_ll;
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112 | ip6_addr_set_allnodes_linklocal(&ip6_allnodes_ll);
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113 | netif->mld_mac_filter(netif, &ip6_allnodes_ll, NETIF_ADD_MAC_FILTER);
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114 | }
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115 | #endif /* LWIP_IPV6 && LWIP_IPV6_MLD */
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116 |
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117 | /* Do whatever else is needed to initialize interface. */
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118 | }
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119 |
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120 | /**
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121 | * This function should do the actual transmission of the packet. The packet is
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122 | * contained in the pbuf that is passed to the function. This pbuf
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123 | * might be chained.
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124 | *
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125 | * @param netif the lwip network interface structure for this ethernetif
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126 | * @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)
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127 | * @return ERR_OK if the packet could be sent
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128 | * an err_t value if the packet couldn't be sent
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129 | *
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130 | * @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to
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131 | * strange results. You might consider waiting for space in the DMA queue
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132 | * to become available since the stack doesn't retry to send a packet
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133 | * dropped because of memory failure (except for the TCP timers).
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134 | */
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135 |
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136 | static err_t
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137 | low_level_output(struct netif *netif, struct pbuf *p)
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138 | {
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139 | struct ethernetif *ethernetif = netif->state;
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140 | struct pbuf *q;
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141 |
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142 | initiate transfer();
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143 |
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144 | #if ETH_PAD_SIZE
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145 | pbuf_remove_header(p, ETH_PAD_SIZE); /* drop the padding word */
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146 | #endif
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147 |
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148 | for (q = p; q != NULL; q = q->next) {
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149 | /* Send the data from the pbuf to the interface, one pbuf at a
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150 | time. The size of the data in each pbuf is kept in the ->len
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151 | variable. */
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152 | send data from(q->payload, q->len);
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153 | }
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154 |
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155 | signal that packet should be sent();
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156 |
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157 | MIB2_STATS_NETIF_ADD(netif, ifoutoctets, p->tot_len);
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158 | if (((u8_t *)p->payload)[0] & 1) {
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159 | /* broadcast or multicast packet*/
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160 | MIB2_STATS_NETIF_INC(netif, ifoutnucastpkts);
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161 | } else {
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162 | /* unicast packet */
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163 | MIB2_STATS_NETIF_INC(netif, ifoutucastpkts);
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164 | }
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165 | /* increase ifoutdiscards or ifouterrors on error */
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166 |
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167 | #if ETH_PAD_SIZE
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168 | pbuf_add_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
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169 | #endif
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170 |
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171 | LINK_STATS_INC(link.xmit);
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172 |
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173 | return ERR_OK;
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174 | }
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175 |
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176 | /**
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177 | * Should allocate a pbuf and transfer the bytes of the incoming
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178 | * packet from the interface into the pbuf.
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179 | *
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180 | * @param netif the lwip network interface structure for this ethernetif
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181 | * @return a pbuf filled with the received packet (including MAC header)
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182 | * NULL on memory error
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183 | */
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184 | static struct pbuf *
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185 | low_level_input(struct netif *netif)
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186 | {
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187 | struct ethernetif *ethernetif = netif->state;
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188 | struct pbuf *p, *q;
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189 | u16_t len;
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190 |
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191 | /* Obtain the size of the packet and put it into the "len"
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192 | variable. */
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193 | len = ;
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194 |
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195 | #if ETH_PAD_SIZE
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196 | len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
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197 | #endif
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198 |
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199 | /* We allocate a pbuf chain of pbufs from the pool. */
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200 | p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
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201 |
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202 | if (p != NULL) {
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203 |
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204 | #if ETH_PAD_SIZE
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205 | pbuf_remove_header(p, ETH_PAD_SIZE); /* drop the padding word */
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206 | #endif
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207 |
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208 | /* We iterate over the pbuf chain until we have read the entire
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209 | * packet into the pbuf. */
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210 | for (q = p; q != NULL; q = q->next) {
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211 | /* Read enough bytes to fill this pbuf in the chain. The
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212 | * available data in the pbuf is given by the q->len
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213 | * variable.
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214 | * This does not necessarily have to be a memcpy, you can also preallocate
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215 | * pbufs for a DMA-enabled MAC and after receiving truncate it to the
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216 | * actually received size. In this case, ensure the tot_len member of the
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217 | * pbuf is the sum of the chained pbuf len members.
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218 | */
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219 | read data into(q->payload, q->len);
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220 | }
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221 | acknowledge that packet has been read();
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222 |
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223 | MIB2_STATS_NETIF_ADD(netif, ifinoctets, p->tot_len);
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224 | if (((u8_t *)p->payload)[0] & 1) {
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225 | /* broadcast or multicast packet*/
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226 | MIB2_STATS_NETIF_INC(netif, ifinnucastpkts);
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227 | } else {
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228 | /* unicast packet*/
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229 | MIB2_STATS_NETIF_INC(netif, ifinucastpkts);
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230 | }
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231 | #if ETH_PAD_SIZE
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232 | pbuf_add_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
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233 | #endif
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234 |
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235 | LINK_STATS_INC(link.recv);
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236 | } else {
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237 | drop packet();
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238 | LINK_STATS_INC(link.memerr);
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239 | LINK_STATS_INC(link.drop);
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240 | MIB2_STATS_NETIF_INC(netif, ifindiscards);
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241 | }
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242 |
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243 | return p;
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244 | }
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245 |
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246 | /**
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247 | * This function should be called when a packet is ready to be read
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248 | * from the interface. It uses the function low_level_input() that
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249 | * should handle the actual reception of bytes from the network
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250 | * interface. Then the type of the received packet is determined and
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251 | * the appropriate input function is called.
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252 | *
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253 | * @param netif the lwip network interface structure for this ethernetif
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254 | */
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255 | static void
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256 | ethernetif_input(struct netif *netif)
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257 | {
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258 | struct ethernetif *ethernetif;
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259 | struct eth_hdr *ethhdr;
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260 | struct pbuf *p;
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261 |
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262 | ethernetif = netif->state;
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263 |
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264 | /* move received packet into a new pbuf */
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265 | p = low_level_input(netif);
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266 | /* if no packet could be read, silently ignore this */
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267 | if (p != NULL) {
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268 | /* pass all packets to ethernet_input, which decides what packets it supports */
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269 | if (netif->input(p, netif) != ERR_OK) {
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270 | LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
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271 | pbuf_free(p);
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272 | p = NULL;
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273 | }
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274 | }
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275 | }
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276 |
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277 | /**
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278 | * Should be called at the beginning of the program to set up the
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279 | * network interface. It calls the function low_level_init() to do the
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280 | * actual setup of the hardware.
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281 | *
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282 | * This function should be passed as a parameter to netif_add().
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283 | *
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284 | * @param netif the lwip network interface structure for this ethernetif
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285 | * @return ERR_OK if the loopif is initialized
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286 | * ERR_MEM if private data couldn't be allocated
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287 | * any other err_t on error
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288 | */
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289 | err_t
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290 | ethernetif_init(struct netif *netif)
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291 | {
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292 | struct ethernetif *ethernetif;
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293 |
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294 | LWIP_ASSERT("netif != NULL", (netif != NULL));
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295 |
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296 | ethernetif = mem_malloc(sizeof(struct ethernetif));
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297 | if (ethernetif == NULL) {
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298 | LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_init: out of memory\n"));
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299 | return ERR_MEM;
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300 | }
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301 |
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302 | #if LWIP_NETIF_HOSTNAME
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303 | /* Initialize interface hostname */
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304 | netif->hostname = "lwip";
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305 | #endif /* LWIP_NETIF_HOSTNAME */
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306 |
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307 | /*
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308 | * Initialize the snmp variables and counters inside the struct netif.
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309 | * The last argument should be replaced with your link speed, in units
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310 | * of bits per second.
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311 | */
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312 | MIB2_INIT_NETIF(netif, snmp_ifType_ethernet_csmacd, LINK_SPEED_OF_YOUR_NETIF_IN_BPS);
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313 |
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314 | netif->state = ethernetif;
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315 | netif->name[0] = IFNAME0;
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316 | netif->name[1] = IFNAME1;
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317 | /* We directly use etharp_output() here to save a function call.
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318 | * You can instead declare your own function an call etharp_output()
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319 | * from it if you have to do some checks before sending (e.g. if link
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320 | * is available...) */
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321 | #if LWIP_IPV4
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322 | netif->output = etharp_output;
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323 | #endif /* LWIP_IPV4 */
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324 | #if LWIP_IPV6
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325 | netif->output_ip6 = ethip6_output;
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326 | #endif /* LWIP_IPV6 */
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327 | netif->linkoutput = low_level_output;
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328 |
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329 | ethernetif->ethaddr = (struct eth_addr *) & (netif->hwaddr[0]);
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330 |
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331 | /* initialize the hardware */
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332 | low_level_init(netif);
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333 |
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334 | return ERR_OK;
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335 | }
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336 |
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337 | #endif /* 0 */
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