46 lines
802 B
C
46 lines
802 B
C
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// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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struct inner_map {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(max_entries, 5);
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__type(key, int);
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__type(value, int);
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} inner_map1 SEC(".maps");
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struct outer_map {
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__uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
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__uint(max_entries, 3);
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__type(key, int);
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__array(values, struct inner_map);
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} outer_map1 SEC(".maps") = {
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.values = {
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[2] = &inner_map1,
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},
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};
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SEC("raw_tp/sys_enter")
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int handle__sys_enter(void *ctx)
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{
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int outer_key = 2, inner_key = 3;
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int *val;
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void *map;
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map = bpf_map_lookup_elem(&outer_map1, &outer_key);
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if (!map)
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return 1;
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val = bpf_map_lookup_elem(map, &inner_key);
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if (!val)
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return 1;
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if (*val == 1)
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*val = 2;
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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