1 /* Copyright 2016 Netflix, Inc.
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.
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/bpf_helpers.h>
12 #include <bpf/bpf_tracing.h>
17 __uint(type, BPF_MAP_TYPE_HASH);
20 __uint(max_entries, MAX_IPS);
21 } ip_map SEC(".maps");
24 int do_sample(struct bpf_perf_event_data *ctx)
27 u32 *value, init_val = 1;
29 ip = PT_REGS_IP(&ctx->regs);
30 value = bpf_map_lookup_elem(&ip_map, &ip);
34 /* E2BIG not tested for this example only */
35 bpf_map_update_elem(&ip_map, &ip, &init_val, BPF_NOEXIST);
39 char _license[] SEC("license") = "GPL";