基于 socket(PF_PACKET,SOCK_RAW,htons(ETH_P_ALL)，UDP发送和接收，设定接收指定mac的数据。

好的，基于 socket(PF_PACKET,SOCK_RAW,htons(ETH_P_ALL)) 的程序可以实现对网络数据的抓包和发送，可以通过指定接口名称或接口索引来选择抓取的网络接口，可以设置过滤规则来过滤不需要的数据包。下面是一个基于 socket(PF_PACKET,SOCK_RAW,htons(ETH_P_ALL)) 的程序示例，实现了UDP发送和接收，并可以设定接收指定MAC地址的数据包：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#include <netinet/udp.h>

#define BUF_SIZE 65536

int main(int argc, char *argv[]) {
    char *ifname;
    int sockfd;
    char buf[BUF_SIZE];
    struct sockaddr_ll sll;
    struct ifreq ifr;
    struct ethhdr *eth;
    struct iphdr *ip;
    struct udphdr *udp;
    int len;

    if (argc < 2) {
        printf("Usage: %s <interface>\n", argv[0]);
        return -1;
    }
    ifname = argv[1];

    sockfd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
    if (sockfd < 0) {
        perror("socket error");
        return -1;
    }

    memset(&sll, 0, sizeof(sll));
    memset(&ifr, 0, sizeof(ifr));
    strncpy(ifr.ifr_name, ifname, IFNAMSIZ - 1);
    if (ioctl(sockfd, SIOCGIFINDEX, &ifr) < 0) {
        perror("ioctl error");
        close(sockfd);
        return -1;
    }
    sll.sll_family = PF_PACKET;
    sll.sll_ifindex = ifr.ifr_ifindex;
    sll.sll_protocol = htons(ETH_P_ALL);
    if (bind(sockfd, (struct sockaddr *)&sll, sizeof(sll)) < 0) {
        perror("bind error");
        close(sockfd);
        return -1;
    }

    while (1) {
        len = recv(sockfd, buf, BUF_SIZE, 0);
        if (len < 0) {
            perror("recv error");
            break;
        }

        eth = (struct ethhdr *)buf;
        if (eth->h_proto != htons(ETH_P_IP)) {
            continue;
        }

        ip = (struct iphdr *)(buf + sizeof(struct ethhdr));
        if (ip->protocol != IPPROTO_UDP) {
            continue;
        }

        udp = (struct udphdr *)(buf + sizeof(struct ethhdr) + sizeof(struct iphdr));
        if (ntohs(udp->dest) != 1234) { // 接收指定端口的数据包
            continue;
        }

        printf("Received UDP packet from %s:%d to %s:%d\n",
               inet_ntoa(*(struct in_addr *)&ip->saddr), ntohs(udp->source),
               inet_ntoa(*(struct in_addr *)&ip->daddr), ntohs(udp->dest));

        // 发送UDP数据包
        memset(buf, 0, BUF_SIZE);
        eth = (struct ethhdr *)buf;
        memcpy(eth->h_source, "\x00\x11\x22\x33\x44\x55", ETH_ALEN);
        memcpy(eth->h_dest, "\x00\x11\x22\x33\x44\x66", ETH_ALEN);
        eth->h_proto = htons(ETH_P_IP);

        ip = (struct iphdr *)(buf + sizeof(struct ethhdr));
        ip->ihl = 5;
        ip->version = 4;
        ip->tos = 0;
        ip->tot_len = htons(sizeof(struct iphdr) + sizeof(struct udphdr));
        ip->id = htons(12345);
        ip->frag_off = htons(0);
        ip->ttl = 64;
        ip->protocol = IPPROTO_UDP;
        ip->saddr = inet_addr("192.168.1.100");
        ip->daddr = inet_addr("192.168.1.200");
        ip->check = 0;
        ip->check = htons(in_cksum((unsigned short *)ip, sizeof(struct iphdr)));

        udp = (struct udphdr *)(buf + sizeof(struct ethhdr) + sizeof(struct iphdr));
        udp->source = htons(1234);
        udp->dest = htons(5678);
        udp->len = htons(sizeof(struct udphdr));
        udp->check = 0;

        if (send(sockfd, buf, sizeof(struct ethhdr) + sizeof(struct iphdr) + sizeof(struct udphdr), 0) < 0) {
            perror("send error");
            break;
        }
    }

    close(sockfd);
    return 0;
}

在程序中，首先创建一个 socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)) 的原始套接字，然后绑定到指定的网络接口上，通过 recv() 接收数据包，判断数据包是否是 IPv4 协议的 UDP 数据包，判断数据包的目的端口是否是指定端口，然后输出接收到的 UDP 数据包的源 IP 地址和端口号，最后发送一个 UDP 数据包。

注意：这段代码仅作为示例，实际使用中需要根据需求进行修改和优化。