e01b4a72f1
Even though it's not relevant in selftests, the people might still copy-paste from them. So let's take care of optlen > 4096 cases explicitly. Signed-off-by: Stanislav Fomichev <sdf@google.com> Link: https://lore.kernel.org/r/20230511170456.1759459-4-sdf@google.com Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
59 lines
1.1 KiB
C
59 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2021 Google LLC.
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*/
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#include <errno.h>
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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__u32 invocations = 0;
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__u32 assertion_error = 0;
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__u32 retval_value = 0;
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__u32 ctx_retval_value = 0;
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__u32 page_size = 0;
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SEC("cgroup/getsockopt")
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int get_retval(struct bpf_sockopt *ctx)
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{
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retval_value = bpf_get_retval();
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ctx_retval_value = ctx->retval;
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__sync_fetch_and_add(&invocations, 1);
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/* optval larger than PAGE_SIZE use kernel's buffer. */
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if (ctx->optlen > page_size)
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ctx->optlen = 0;
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return 1;
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}
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SEC("cgroup/getsockopt")
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int set_eisconn(struct bpf_sockopt *ctx)
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{
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__sync_fetch_and_add(&invocations, 1);
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if (bpf_set_retval(-EISCONN))
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assertion_error = 1;
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/* optval larger than PAGE_SIZE use kernel's buffer. */
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if (ctx->optlen > page_size)
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ctx->optlen = 0;
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return 1;
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}
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SEC("cgroup/getsockopt")
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int clear_retval(struct bpf_sockopt *ctx)
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{
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__sync_fetch_and_add(&invocations, 1);
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ctx->retval = 0;
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/* optval larger than PAGE_SIZE use kernel's buffer. */
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if (ctx->optlen > page_size)
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ctx->optlen = 0;
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return 1;
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}
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