45 lines
841 B
C
45 lines
841 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include "bpf_misc.h"
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#define __unused __attribute__((unused))
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struct {
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__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
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__uint(max_entries, 1);
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__uint(key_size, sizeof(__u32));
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__uint(value_size, sizeof(__u32));
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} jmp_table SEC(".maps");
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int done = 0;
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SEC("tc")
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int classifier_0(struct __sk_buff *skb __unused)
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{
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done = 1;
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return 0;
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}
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static __noinline
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int subprog_tail(struct __sk_buff *skb)
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{
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/* Don't propagate the constant to the caller */
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volatile int ret = 1;
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bpf_tail_call_static(skb, &jmp_table, 0);
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return ret;
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}
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SEC("tc")
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int entry(struct __sk_buff *skb)
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{
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/* Have data on stack which size is not a multiple of 8 */
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volatile char arr[1] = {};
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__sink(arr[0]);
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return subprog_tail(skb);
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}
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char __license[] SEC("license") = "GPL";
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