这段代码为什么捕捉不到任何数据包？

linux:

// clang -o raw raw.c && ./raw
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>

#define BUFFER_SIZE 65536

int main(int argc, char *argv[])
{
    printf("Starting raw socket\n");

    int sockfd, n;
    char buffer[BUFFER_SIZE];
    struct sockaddr_in addr;
    struct iphdr *ip_header;

    // 创建 socket
    sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
    if (sockfd < 0) {
        perror("socket");
        exit(EXIT_FAILURE);
    }

    // 设置 socket 选项
    int on = 1;
    if (setsockopt(sockfd, IPPROTO_IP, IP_HDRINCL, &on, sizeof(on)) < 0) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }

    // 绑定地址
    memset(&addr, 0, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_addr.s_addr = INADDR_ANY;
    if (bind(sockfd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
        perror("bind");
        exit(EXIT_FAILURE);
    }

    // 接收数据
    printf("Waiting for packet\n");
    while (1) {
        n = recv(sockfd, buffer, BUFFER_SIZE, 0);
        if (n < 0) {
            perror("recv");
            exit(EXIT_FAILURE);
        }

        // 解析 IP 头部
        ip_header = (struct iphdr *)buffer;
        printf("Received packet from %s\n", inet_ntoa(*(struct in_addr *)&ip_header->saddr));
    }

    return 0;
}