// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2020 Facebook */ #include <vmlinux.h> #include <bpf/bpf_helpers.h> char _license[] SEC("license") = "GPL"; __u32 map1_id = 0, map2_id = 0; __u32 map1_accessed = 0, map2_accessed = 0; __u64 map1_seqnum = 0, map2_seqnum1 = 0, map2_seqnum2 = 0; volatile const __u32 print_len; volatile const __u32 ret1; SEC("iter/bpf_map") int dump_bpf_map(struct bpf_iter__bpf_map *ctx) { struct seq_file *seq = ctx->meta->seq; struct bpf_map *map = ctx->map; __u64 seq_num; int i, ret = 0; if (map == (void *)0) return 0; /* only dump map1_id and map2_id */ if (map->id != map1_id && map->id != map2_id) return 0; seq_num = ctx->meta->seq_num; if (map->id == map1_id) { map1_seqnum = seq_num; map1_accessed++; } if (map->id == map2_id) { if (map2_accessed == 0) { map2_seqnum1 = seq_num; if (ret1) ret = 1; } else { map2_seqnum2 = seq_num; } map2_accessed++; } /* fill seq_file buffer */ for (i = 0; i < (int)print_len; i++) bpf_seq_write(seq, &seq_num, sizeof(seq_num)); return ret; }