#define ARP_TABLE_SIZE 10 struct etharp_entry { #if ARP_QUEUEING /* 数据包缓存队列指针 */ struct etharp_q_entry *q; #else /* ARP_QUEUEING */ /* 指向此 ARP 表项上的单个挂起数据包的指针 */ struct pbuf *q; #endif /* ARP_QUEUEING */ ip4_addr_t ipaddr; /* 目标 IP 地址 */...
1.IP协议简介 IP协议是TCP/IP协议族中最为核心的协议,TCP、UDP、ICMP、IGMP数据都以IP数据报格式传输(IPv4、IPv6)。 IP协议指网际互联协议,Internet Protocol,为上层提供了无连接、不可靠的服务; 无连接:IP通讯双方都不长久的维持对方的任何信息;这表明每次上层协议发送数据都需要指定IP地址。 不可靠:IP协议不...
IP 协议(Internet Protocol),又称之为网际协议,IP 协议处于 IP 层工作,它是整个 TCP/IP 协议栈的核心协议,上层协议都要依赖 IP 协议提供的服务,IP 协议负责将数据报从源主机发送到目标主机,通过 IP 地址作为唯一识别码。IP 协议是一种无连接的不可靠数据报交付协议,协议本身不提供任何的错误检查与恢复机制。
对于初学者,可以先略过一眼TCP控制块的各个字段,在分析具体操作源码时,遇到不懂的变量可以回TCP控制块查找。 /** the TCP protocol control block */structtcp_pcb{/** common PCB members */IP_PCB;/** protocol specific PCB members */TCP_PCB_COMMON(struct tcp_pcb);/* ports are in host byte ord...
struct sockaddr_in client_addr; socklen_t client_addr_len; int optval = 1; //创建socket udp通信 sfd = Socket(AF_INET, SOCK_DGRAM, 0); setsockopt(sfd, SOL_SOCKET, SO_BROADCAST, &optval, sizeof(optval)); client_addr.sin_family = AF_INET; ...
IPAddr:__eq(other) -> boolean Implement the equality operator. IPAddr:__tostring() -> string Implement the string conversion operator. lwip.dns Module:lwip.dns, build target:mlua_mod_lwip.dns, tests:lwip.dns.test This module provides DNS resolution functionality. ...
IPAddr:__eq(other) -> boolean Implement the equality operator. IPAddr:__tostring() -> string Implement the string conversion operator. lwip.dns Module:lwip.dns, build target:mlua_mod_lwip.dns, tests:lwip.dns.test This module provides DNS resolution functionality. ...
* The eth_addr_cmp and ip_addr_cmp set of functions have been renamed to eth_addr_eq, ip_addr_eq and so on, since they return non-zero on equality. Macros for the old names exist. * The sio_write function used by PPP now takes the data argument as const. ...
* Cleanup confusing use of CONFIG_ETH*ADDR - ust his only to pre-define a MAC address; use CONFIG_HAS_ETH* to enable support for additional ethernet addresses. * Cleanup drivers/i82365.c - avoid duplication of code * Fix bogus "cannot span across banks" flash error message * Code ...
struct ip_addr ipaddr, netmask, gw; tcpip_init(NULL,NULL); IP4_ADDR(&gw, 192,168,0,1); IP4_ADDR(&ipaddr, 192,168,0,174); IP4_ADDR(&netmask, 255,255,255,0); netif_add(&rtl8019_netif,&ipaddr,&netmask,&gw,NULL,ethernetif_init,tcpip_input); ...