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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2021 Google LLC.
*/
#include <errno.h>
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
__u32 invocations = 0;
__u32 assertion_error = 0;
__u32 retval_value = 0;
__u32 ctx_retval_value = 0;
__u32 page_size = 0;
SEC("cgroup/getsockopt")
int get_retval(struct bpf_sockopt *ctx)
{
retval_value = bpf_get_retval();
ctx_retval_value = ctx->retval;
__sync_fetch_and_add(&invocations, 1);
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 1;
}
SEC("cgroup/getsockopt")
int set_eisconn(struct bpf_sockopt *ctx)
{
__sync_fetch_and_add(&invocations, 1);
if (bpf_set_retval(-EISCONN))
assertion_error = 1;
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 1;
}
SEC("cgroup/getsockopt")
int clear_retval(struct bpf_sockopt *ctx)
{
__sync_fetch_and_add(&invocations, 1);
ctx->retval = 0;
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 1;
}
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