// SPDX-License-Identifier: GPL-2.0

#include <linux/stddef.h>
#include <linux/bpf.h>
#include <linux/in6.h>
#include <sys/socket.h>

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

#include <bpf_sockopt_helpers.h>

#define SERV6_IP_0              0xfaceb00c /* face:b00c:1234:5678::abcd */
#define SERV6_IP_1              0x12345678
#define SERV6_IP_2              0x00000000
#define SERV6_IP_3              0x0000abcd
#define SERV6_PORT              6060

SEC("cgroup/recvmsg6")
int recvmsg6_prog(struct bpf_sock_addr *ctx)
{
        struct bpf_sock *sk;

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

        if (sk->family != AF_INET6)
                return 1;

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

        if (!get_set_sk_priority(ctx))
                return 1;

        ctx->user_ip6[0] = bpf_htonl(SERV6_IP_0);
        ctx->user_ip6[1] = bpf_htonl(SERV6_IP_1);
        ctx->user_ip6[2] = bpf_htonl(SERV6_IP_2);
        ctx->user_ip6[3] = bpf_htonl(SERV6_IP_3);
        ctx->user_port = bpf_htons(SERV6_PORT);

        return 1;
}

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