| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /* Copyright (c) 2017 Facebook |
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| 3 | */ |
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| 4 | #include <uapi/linux/bpf.h> |
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| 5 | #include <bpf/bpf_helpers.h> |
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| 6 | |
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| 7 | #if !defined(__aarch64__) |
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| 8 | struct syscalls_enter_open_args { |
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| 9 | unsigned long long unused; |
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| 10 | long syscall_nr; |
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| 11 | long filename_ptr; |
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| 12 | long flags; |
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| 13 | long mode; |
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| 14 | }; |
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| 15 | #endif |
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| 16 | |
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| 17 | struct syscalls_exit_open_args { |
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| 18 | unsigned long long unused; |
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| 19 | long syscall_nr; |
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| 20 | long ret; |
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| 21 | }; |
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| 22 | |
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| 23 | struct syscalls_enter_open_at_args { |
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| 24 | unsigned long long unused; |
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| 25 | long syscall_nr; |
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| 26 | long long dfd; |
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| 27 | long filename_ptr; |
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| 28 | long flags; |
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| 29 | long mode; |
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| 30 | }; |
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| 31 | |
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| 32 | struct { |
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| 33 | __uint(type, BPF_MAP_TYPE_ARRAY); |
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| 34 | __type(key, u32); |
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| 35 | __type(value, u32); |
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| 36 | __uint(max_entries, 1); |
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| 37 | } enter_open_map SEC(".maps" ); |
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| 38 | |
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| 39 | struct { |
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| 40 | __uint(type, BPF_MAP_TYPE_ARRAY); |
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| 41 | __type(key, u32); |
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| 42 | __type(value, u32); |
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| 43 | __uint(max_entries, 1); |
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| 44 | } exit_open_map SEC(".maps" ); |
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| 45 | |
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| 46 | static __always_inline void count(void *map) |
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| 47 | { |
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| 48 | u32 key = 0; |
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| 49 | u32 *value, init_val = 1; |
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| 50 | |
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| 51 | value = bpf_map_lookup_elem(map, &key); |
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| 52 | if (value) |
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| 53 | *value += 1; |
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| 54 | else |
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| 55 | bpf_map_update_elem(map, &key, &init_val, BPF_NOEXIST); |
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| 56 | } |
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| 57 | |
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| 58 | #if !defined(__aarch64__) |
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| 59 | SEC("tracepoint/syscalls/sys_enter_open" ) |
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| 60 | int trace_enter_open(struct syscalls_enter_open_args *ctx) |
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| 61 | { |
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| 62 | count(&enter_open_map); |
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| 63 | return 0; |
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| 64 | } |
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| 65 | #endif |
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| 66 | |
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| 67 | SEC("tracepoint/syscalls/sys_enter_openat" ) |
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| 68 | int trace_enter_open_at(struct syscalls_enter_open_at_args *ctx) |
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| 69 | { |
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| 70 | count(&enter_open_map); |
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| 71 | return 0; |
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| 72 | } |
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| 73 | |
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| 74 | SEC("tracepoint/syscalls/sys_enter_openat2" ) |
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| 75 | int trace_enter_open_at2(struct syscalls_enter_open_at_args *ctx) |
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| 76 | { |
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| 77 | count(&enter_open_map); |
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| 78 | return 0; |
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| 79 | } |
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| 80 | |
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| 81 | #if !defined(__aarch64__) |
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| 82 | SEC("tracepoint/syscalls/sys_exit_open" ) |
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| 83 | int trace_enter_exit(struct syscalls_exit_open_args *ctx) |
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| 84 | { |
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| 85 | count(&exit_open_map); |
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| 86 | return 0; |
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| 87 | } |
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| 88 | #endif |
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| 89 | |
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| 90 | SEC("tracepoint/syscalls/sys_exit_openat" ) |
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| 91 | int trace_enter_exit_at(struct syscalls_exit_open_args *ctx) |
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| 92 | { |
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| 93 | count(&exit_open_map); |
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| 94 | return 0; |
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| 95 | } |
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| 96 | |
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| 97 | SEC("tracepoint/syscalls/sys_exit_openat2" ) |
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| 98 | int trace_enter_exit_at2(struct syscalls_exit_open_args *ctx) |
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| 99 | { |
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| 100 | count(&exit_open_map); |
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| 101 | return 0; |
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| 102 | } |
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| 103 | |
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