| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | #include <linux/bpf.h> |
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| 3 | #include <bpf/bpf_helpers.h> |
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| 4 | #include "bpf_misc.h" |
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| 5 | |
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| 6 | #define __unused __attribute__((unused)) |
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| 7 | |
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| 8 | struct { |
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| 9 | __uint(type, BPF_MAP_TYPE_PROG_ARRAY); |
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| 10 | __uint(max_entries, 1); |
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| 11 | __uint(key_size, sizeof(__u32)); |
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| 12 | __uint(value_size, sizeof(__u32)); |
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| 13 | } jmp_table SEC(".maps" ); |
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| 14 | |
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| 15 | int done = 0; |
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| 16 | |
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| 17 | SEC("tc" ) |
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| 18 | int classifier_0(struct __sk_buff *skb __unused) |
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| 19 | { |
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| 20 | done = 1; |
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| 21 | return 0; |
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| 22 | } |
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| 23 | |
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| 24 | static __noinline |
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| 25 | int subprog_tail(struct __sk_buff *skb) |
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| 26 | { |
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| 27 | /* Don't propagate the constant to the caller */ |
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| 28 | volatile int ret = 1; |
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| 29 | |
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| 30 | bpf_tail_call_static(skb, &jmp_table, 0); |
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| 31 | return ret; |
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| 32 | } |
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| 33 | |
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| 34 | SEC("tc" ) |
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| 35 | int entry(struct __sk_buff *skb) |
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| 36 | { |
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| 37 | /* Have data on stack which size is not a multiple of 8 */ |
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| 38 | volatile char arr[1] = {}; |
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| 39 | |
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| 40 | __sink(arr[0]); |
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| 41 | |
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| 42 | return subprog_tail(skb); |
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| 43 | } |
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| 44 | |
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| 45 | char __license[] SEC("license" ) = "GPL" ; |
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| 46 | |
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