forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
39 lines
942 B
39 lines
942 B
/* Copyright 2016 Netflix, Inc. |
|
* |
|
* This program is free software; you can redistribute it and/or |
|
* modify it under the terms of version 2 of the GNU General Public |
|
* License as published by the Free Software Foundation. |
|
*/ |
|
#include <linux/version.h> |
|
#include <linux/ptrace.h> |
|
#include <uapi/linux/bpf.h> |
|
#include <uapi/linux/bpf_perf_event.h> |
|
#include <bpf/bpf_helpers.h> |
|
#include <bpf/bpf_tracing.h> |
|
|
|
#define MAX_IPS 8192 |
|
|
|
struct { |
|
__uint(type, BPF_MAP_TYPE_HASH); |
|
__type(key, u64); |
|
__type(value, u32); |
|
__uint(max_entries, MAX_IPS); |
|
} ip_map SEC(".maps"); |
|
|
|
SEC("perf_event") |
|
int do_sample(struct bpf_perf_event_data *ctx) |
|
{ |
|
u64 ip; |
|
u32 *value, init_val = 1; |
|
|
|
ip = PT_REGS_IP(&ctx->regs); |
|
value = bpf_map_lookup_elem(&ip_map, &ip); |
|
if (value) |
|
*value += 1; |
|
else |
|
/* E2BIG not tested for this example only */ |
|
bpf_map_update_elem(&ip_map, &ip, &init_val, BPF_NOEXIST); |
|
|
|
return 0; |
|
} |
|
char _license[] SEC("license") = "GPL";
|
|
|