197 lines
6.0 KiB
C
197 lines
6.0 KiB
C
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/*
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* Copyright (c) 2020 AIIT XUOS Lab
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* XiUOS is licensed under Mulan PSL v2.
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* You can use this software according to the terms and conditions of the Mulan PSL v2.
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* You may obtain a copy of Mulan PSL v2 at:
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* http://license.coscl.org.cn/MulanPSL2
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PSL v2 for more details.
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*/
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#include "lwip/opt.h"
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#include "lwip/def.h"
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#include "lwip/mem.h"
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#include "lwip/pbuf.h"
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#include "lwip/stats.h"
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#include "lwip/snmp.h"
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#include "lwip/ethip6.h"
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#include "lwip/etharp.h"
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#include "libserial.h"
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/* Define those to better describe your network interface. */
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#define IFNAME0 'e'
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#define IFNAME1 'n'
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/**
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* In this function, the hardware should be initialized.
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* Called from ethernetif_init().
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*
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* @param netif the already initialized lwip network interface structure
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* for this ethernetif
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*/
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static void low_level_init(struct netif *netif)
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{
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#if LWIP_ARP || LWIP_ETHERNET
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/* set MAC hardware address length */
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netif->hwaddr_len = ETH_HWADDR_LEN;
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/* set MAC hardware address */
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netif->hwaddr[0] = 0x02;
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netif->hwaddr[1] = 0x12;
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netif->hwaddr[2] = 0x34;
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netif->hwaddr[3] = 0x56;
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netif->hwaddr[4] = 0x78;
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netif->hwaddr[5] = 0xab;
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netif->hwaddr_len = 6;
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/* maximum transfer unit */
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netif->mtu = 1500;
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#if LWIP_ARP
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netif->flags |= NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_LINK_UP ;
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#else
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netif->flags |= NETIF_FLAG_BROADCAST;
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#endif /* LWIP_ARP */
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#endif /* LWIP_ARP || LWIP_ETHERNET */
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}
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void print_packet_data(const char *packet_data, int length) {
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printf("Packet Data:\n");
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for (int i = 0; i < length; ++i) {
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printf("%02X ", packet_data[i]); // 打印十六进制值，每个字节两位
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if ((i + 1) % 16 == 0 || i == length - 1) { // 每16个字节一行
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for (int j = 0; j < 15 - (i % 16); ++j) {
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printf(" "); // 打印空格对齐
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}
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printf("| ");
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for (int j = i - (i % 16); j <= i; ++j) {
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if (packet_data[j] >= 32 && packet_data[j] <= 126) {
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printf("%c", packet_data[j]); // 如果是可打印的ASCII字符，打印对应字符
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} else {
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printf("."); // 否则打印点表示不可打印字符
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}
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}
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printf("\n");
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}
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}
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}
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/**
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* This function should do the actual transmission of the packet. The packet is
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* contained in the pbuf that is passed to the function. This pbuf
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* might be chained.
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*
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* @param netif the lwip network interface structure for this ethernetif
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* @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)
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* @return ERR_OK if the packet could be sent
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* an err_t value if the packet couldn't be sent
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*
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* @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to
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* strange results. You might consider waiting for space in the DMA queue
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* to become available since the stack doesn't retry to send a packet
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* dropped because of memory failure (except for the TCP timers).
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*/
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static err_t low_level_output(struct netif *netif, struct pbuf *p)
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{
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char buf[1518];
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#if ETH_PAD_SIZE
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pbuf_remove_header(p, ETH_PAD_SIZE); /* drop the padding word */
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#endif
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pbuf_copy_partial(p, buf, p->tot_len, 0);
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print_packet_data(buf, p->tot_len);
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return ERR_OK;
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}
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/**
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* Should allocate a pbuf and transfer the bytes of the incoming
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* packet from the interface into the pbuf.
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*
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* @param netif the lwip network interface structure for this ethernetif
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* @return a pbuf filled with the received packet (including MAC header)
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* NULL on memory error
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*/
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static struct pbuf* low_level_input(struct netif *netif)
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{
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struct pbuf *p=NULL, *q=NULL;
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return p;
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}
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/**
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* This function should be called when a packet is ready to be read
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* from the interface. It uses the function low_level_input() that
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* should handle the actual reception of bytes from the network
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* interface. Then the type of the received packet is determined and
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* the appropriate input function is called.
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*
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* @param netif the lwip network interface structure for this ethernetif
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*/
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void ethernetif_input(struct netif *netif)
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{
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struct pbuf *p;
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/* move received packet into a new pbuf */
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p = low_level_input(netif);
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/* if no packet could be read, silently ignore this */
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if (p != NULL) {
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/* pass all packets to ethernet_input, which decides what packets it supports */
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if (netif->input(p, netif) != ERR_OK) {
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LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
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pbuf_free(p);
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p = NULL;
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}
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}
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}
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/**
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* Should be called at the beginning of the program to set up the
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* network interface. It calls the function low_level_init() to do the
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* actual setup of the hardware.
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*
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* This function should be passed as a parameter to netif_add().
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*
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* @param netif the lwip network interface structure for this ethernetif
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* @return ERR_OK if the loopif is initialized
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* ERR_MEM if private data couldn't be allocated
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* any other err_t on error
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*/
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err_t ethernetif_init(struct netif *netif)
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{
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LWIP_ASSERT("netif != NULL", (netif != NULL));
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#if LWIP_NETIF_HOSTNAME
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/* Initialize interface hostname */
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netif->hostname = "lwip";
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#endif /* LWIP_NETIF_HOSTNAME */
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/*
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* Initialize the snmp variables and counters inside the struct netif.
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* The last argument should be replaced with your link speed, in units
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* of bits per second.
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*/
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MIB2_INIT_NETIF(netif, snmp_ifType_ethernet_csmacd, 100000000);
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netif->name[0] = IFNAME0;
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netif->name[1] = IFNAME1;
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#if LWIP_IPV4
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netif->output = etharp_output;
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#endif /* LWIP_IPV4 */
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#if LWIP_IPV6
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netif->output_ip6 = ethip6_output;
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#endif /* LWIP_IPV6 */
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netif->linkoutput = low_level_output;
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/* initialize the hardware */
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low_level_init(netif);
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return ERR_OK;
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}
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