| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 1 | #include <uapi/linux/bpf.h> |
| 2 | #include <uapi/linux/if_ether.h> |
| 3 | #include <uapi/linux/if_packet.h> |
| 4 | #include <uapi/linux/ip.h> |
| 5 | #include "bpf_helpers.h" |
| 6 | |
| 7 | struct { |
| 8 | __uint(type, BPF_MAP_TYPE_ARRAY); |
| 9 | __type(key, u32); |
| 10 | __type(value, long); |
| 11 | __uint(max_entries, 256); |
| 12 | } my_map SEC(".maps"); |
| 13 | |
| 14 | SEC("socket1") |
| 15 | int bpf_prog1(struct __sk_buff *skb) |
| 16 | { |
| 17 | int index = load_byte(skb, ETH_HLEN + offsetof(struct iphdr, protocol)); |
| 18 | long *value; |
| 19 | |
| 20 | if (skb->pkt_type != PACKET_OUTGOING) |
| 21 | return 0; |
| 22 | |
| 23 | value = bpf_map_lookup_elem(&my_map, &index); |
| 24 | if (value) |
| 25 | __sync_fetch_and_add(value, skb->len); |
| 26 | |
| 27 | return 0; |
| 28 | } |
| 29 | char _license[] SEC("license") = "GPL"; |