linux系统中，创建ipv6协议的raw接收服务端，当接收到报文并解析出对端源地址，并生成的ns组播地址，然后发送ns报文的程序代码

以下是一个简单的基于IPv6协议的Raw Socket的服务端程序，可以接收ICMPv6 NS报文，并解析出对端源地址，并生成NS组播地址，然后发送NS报文：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/icmp6.h>
#include <arpa/inet.h>

#define BUFFER_SIZE 1024

int main(int argc, char *argv[]) {
    int sock_fd;
    struct sockaddr_in6 server_addr;
    char buffer[BUFFER_SIZE];
    ssize_t num_bytes;

    // 创建IPv6 Raw Socket
    sock_fd = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
    if (sock_fd == -1) {
        perror("socket");
        exit(EXIT_FAILURE);
    }

    // 初始化服务器地址结构体
    bzero(&server_addr, sizeof(server_addr));
    server_addr.sin6_family = AF_INET6;
    server_addr.sin6_addr = in6addr_any;

    // 绑定到本地地址
    if (bind(sock_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
        perror("bind");
        exit(EXIT_FAILURE);
    }

    for (;;) {
        // 读取数据报
        num_bytes = recvfrom(sock_fd, buffer, BUFFER_SIZE, 0, NULL, NULL);
        if (num_bytes == -1) {
            perror("recvfrom");
            exit(EXIT_FAILURE);
        }

        // 解析ICMPv6 NS报文
        struct nd_neighbor_solicit *ns_header = (struct nd_neighbor_solicit *)buffer;
        struct in6_addr src_addr = ns_header->nd_ns_target;
        struct in6_addr dst_addr;
        dst_addr.s6_addr[0] = 0xff;
        dst_addr.s6_addr[1] = 0x02;
        dst_addr.s6_addr[11] = 0x01;
        dst_addr.s6_addr[12] = 0xff;
        memcpy(&dst_addr.s6_addr[13], &src_addr.s6_addr[13], 3);

        // 构造ICMPv6 NS报文
        memset(buffer, 0, BUFFER_SIZE);
        struct nd_neighbor_solicit *ns_reply_header = (struct nd_neighbor_solicit *)buffer;
        ns_reply_header->nd_ns_type = ND_NEIGHBOR_SOLICIT;
        ns_reply_header->nd_ns_code = 0;
        ns_reply_header->nd_ns_target = src_addr;
        struct sockaddr_in6 dst_sockaddr;
        dst_sockaddr.sin6_family = AF_INET6;
        dst_sockaddr.sin6_addr = dst_addr;

        // 发送ICMPv6 NS报文
        if (sendto(sock_fd, buffer, sizeof(struct nd_neighbor_solicit), 0, (struct sockaddr *)&dst_sockaddr, sizeof(dst_sockaddr)) == -1) {
            perror("sendto");
            exit(EXIT_FAILURE);
        }
    }

    close(sock_fd);
    return 0;
}

这个程序会不断接收ICMPv6 NS报文，并解析出对端源地址，然后生成NS组播地址，构造ICMPv6 NS报文，发送给对端。注意，这个程序需要以root权限运行。