1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2020 Facebook */ 3 #include "bpf_iter.h" 4 #include <bpf/bpf_helpers.h> 5 6 char _license[] SEC("license") = "GPL"; 7 8 __u32 value_sum = 0; 9 10 SEC("iter/bpf_map_elem") 11 int dump_bpf_hash_map(struct bpf_iter__bpf_map_elem *ctx) 12 { 13 void *value = ctx->value; 14 15 if (value == (void *)0) 16 return 0; 17 18 /* negative offset, verifier failure. */ 19 value_sum += *(__u32 *)(value - 4); 20 return 0; 21 } 22