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") bpf_prog1(struct __sk_buff * skb)15int 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"; 30