1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* Copyright (c) 2018 Facebook */ 3 #include <linux/bpf.h> 4 #include "bpf_helpers.h" 5 6 int _version SEC("version") = 1; 7 8 struct ipv_counts { 9 unsigned int v4; 10 unsigned int v6; 11 }; 12 13 struct bpf_map_def SEC("maps") btf_map = { 14 .type = BPF_MAP_TYPE_ARRAY, 15 .key_size = sizeof(int), 16 .value_size = sizeof(struct ipv_counts), 17 .max_entries = 4, 18 }; 19 20 BPF_ANNOTATE_KV_PAIR(btf_map, int, struct ipv_counts); 21 22 struct dummy_tracepoint_args { 23 unsigned long long pad; 24 struct sock *sock; 25 }; 26 27 SEC("dummy_tracepoint") 28 int _dummy_tracepoint(struct dummy_tracepoint_args *arg) 29 { 30 struct ipv_counts *counts; 31 int key = 0; 32 33 if (!arg->sock) 34 return 0; 35 36 counts = bpf_map_lookup_elem(&btf_map, &key); 37 if (!counts) 38 return 0; 39 40 counts->v6++; 41 42 return 0; 43 } 44 45 char _license[] SEC("license") = "GPL"; 46
