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/bpf_helpers.h> 6 #include "bpf_legacy.h" 7 8 struct { 9 __uint(type, BPF_MAP_TYPE_ARRAY); 10 __type(key, u32); 11 __type(value, long); 12 __uint(max_entries, 256); 13 } my_map SEC(".maps"); 14 15 SEC("socket1") 16 int bpf_prog1(struct __sk_buff *skb) 17 { 18 int index = load_byte(skb, ETH_HLEN + offsetof(struct iphdr, protocol)); 19 long *value; 20 21 if (skb->pkt_type != PACKET_OUTGOING) 22 return 0; 23 24 value = bpf_map_lookup_elem(&my_map, &index); 25 if (value) 26 __sync_fetch_and_add(value, skb->len); 27 28 return 0; 29 } 30 char _license[] SEC("license") = "GPL"; 31