为什么我没有收到使用带 udp 套接字的 BPF 的任何数据包？

目标：编写一个 BPF 过滤器，它只允许来自特定 src 地址的 UDP 数据包并将其附加到 UDP 套接字。

问题：如果我执行程序并尝试从具有正确 src IP 的 VM 发送 udp 数据包，我将不会收到任何数据包

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>

#include <arpa/inet.h>
#include <linux/filter.h>

/* udp and src 192.168.56.101 */
struct sock_filter bpfcode[] = {
    { 0x28, 0, 0, 0x0000000c },
    { 0x15, 6, 0, 0x000086dd },
    { 0x15, 0, 5, 0x00000800 },
    { 0x30, 0, 0, 0x00000017 },
    { 0x15, 0, 3, 0x00000011 },
    { 0x20, 0, 0, 0x0000001a },
    { 0x15, 0, 1, 0xc0a83865 },
    { 0x6,  0, 0, 0x00040000 },
    { 0x6,  0, 0, 0x00000000 },
};

int main(void)
{
    struct sock_fprog bpf = {
        sizeof(bpfcode) / sizeof(struct sock_filter),
        bpfcode
    };
    struct sockaddr_in src = {
        .sin_family = AF_INET,
        .sin_addr.s_addr = INADDR_ANY,
        .sin_port = htons(1025)
    };
    char buf[1024];
    ssize_t res;
    int fd, ret;

    fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
    if (fd < 0) {
        printf("error: socket\n");
        exit(EXIT_FAILURE);
    }

    ret = setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &bpf, sizeof(bpf));
    if (ret < 0) {
        perror("error: setsockopt\n");
        close(fd);
        exit(EXIT_FAILURE);
    }

    ret = bind(fd, (struct sockaddr *)&src, sizeof(src));
    if (ret < 0) {
        printf("error: bind\n");
        close(fd);
        exit(EXIT_FAILURE);
    }

    res = recvfrom(fd, buf, sizeof(buf), 0, NULL, 0);
    printf("res = %zi\n", res);

    close(fd);

    return 0;
}