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// 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";
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