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72874418 BG |
1 | /* Copyright 2016 Netflix, Inc. |
2 | * | |
3 | * This program is free software; you can redistribute it and/or | |
4 | * modify it under the terms of version 2 of the GNU General Public | |
5 | * License as published by the Free Software Foundation. | |
6 | */ | |
7 | #include <linux/version.h> | |
8 | #include <linux/ptrace.h> | |
9 | #include <uapi/linux/bpf.h> | |
10 | #include <uapi/linux/bpf_perf_event.h> | |
11 | #include "bpf_helpers.h" | |
12 | ||
13 | #define MAX_IPS 8192 | |
14 | ||
15 | struct bpf_map_def SEC("maps") ip_map = { | |
16 | .type = BPF_MAP_TYPE_HASH, | |
17 | .key_size = sizeof(u64), | |
18 | .value_size = sizeof(u32), | |
19 | .max_entries = MAX_IPS, | |
20 | }; | |
21 | ||
22 | SEC("perf_event") | |
23 | int do_sample(struct bpf_perf_event_data *ctx) | |
24 | { | |
25 | u64 ip; | |
26 | u32 *value, init_val = 1; | |
27 | ||
2dbb4c05 | 28 | ip = PT_REGS_IP(&ctx->regs); |
72874418 BG |
29 | value = bpf_map_lookup_elem(&ip_map, &ip); |
30 | if (value) | |
31 | *value += 1; | |
32 | else | |
33 | /* E2BIG not tested for this example only */ | |
34 | bpf_map_update_elem(&ip_map, &ip, &init_val, BPF_NOEXIST); | |
35 | ||
36 | return 0; | |
37 | } | |
38 | char _license[] SEC("license") = "GPL"; |