// SPDX-License-Identifier: GPL-2.0

#include <linux/stddef.h>
#include <linux/bpf.h>
#include <linux/in.h>
#include <sys/socket.h>

#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>

#include <bpf_sockopt_helpers.h>

#define SERV4_IP                0xc0a801feU /* 192.168.1.254 */
#define SERV4_PORT              4040

SEC("cgroup/recvmsg4")
int recvmsg4_prog(struct bpf_sock_addr *ctx)
{
        struct bpf_sock *sk;

        sk = ctx->sk;
        if (!sk)
                return 1;

        if (sk->family != AF_INET)
                return 1;

        if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)
                return 1;

        if (!get_set_sk_priority(ctx))
                return 1;

        ctx->user_ip4 = bpf_htonl(SERV4_IP);
        ctx->user_port = bpf_htons(SERV4_PORT);

        return 1;
}

char _license[] SEC("license") = "GPL";