// SPDX-License-Identifier: GPL-2.0
/* Copyright Amazon.com Inc. or its affiliates. */
#include <vmlinux.h>
#include "bpf_tracing_net.h"
#include <bpf/bpf_helpers.h>
#include <limits.h>

#define AUTOBIND_LEN 6
char sun_path[AUTOBIND_LEN];

#define NR_CASES 5
int sndbuf_setsockopt[NR_CASES] = {-1, 0, 8192, INT_MAX / 2, INT_MAX};
int sndbuf_getsockopt[NR_CASES] = {-1, -1, -1, -1, -1};
int sndbuf_getsockopt_expected[NR_CASES];

static inline int cmpname(struct unix_sock *unix_sk)
{
        int i;

        for (i = 0; i < AUTOBIND_LEN; i++) {
                if (unix_sk->addr->name->sun_path[i] != sun_path[i])
                        return -1;
        }

        return 0;
}

SEC("iter/unix")
int change_sndbuf(struct bpf_iter__unix *ctx)
{
        struct unix_sock *unix_sk = ctx->unix_sk;
        int i, err;

        if (!unix_sk || !unix_sk->addr)
                return 0;

        if (unix_sk->addr->name->sun_path[0])
                return 0;

        if (cmpname(unix_sk))
                return 0;

        for (i = 0; i < NR_CASES; i++) {
                err = bpf_setsockopt(unix_sk, SOL_SOCKET, SO_SNDBUF,
                                     &sndbuf_setsockopt[i],
                                     sizeof(sndbuf_setsockopt[i]));
                if (err)
                        break;

                err = bpf_getsockopt(unix_sk, SOL_SOCKET, SO_SNDBUF,
                                     &sndbuf_getsockopt[i],
                                     sizeof(sndbuf_getsockopt[i]));
                if (err)
                        break;
        }

        return 0;
}

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