14 static inline void set_dst_mac(struct __sk_buff *skb, char *mac)  in set_dst_mac()  argument
16 	bpf_skb_store_bytes(skb, 0, mac, ETH_ALEN, 1);  in set_dst_mac()
22 static inline void set_ip_tos(struct __sk_buff *skb, __u8 new_tos)  in set_ip_tos()  argument
24 	__u8 old_tos = load_byte(skb, BPF_LL_OFF + TOS_OFF);  in set_ip_tos()
26 	bpf_l3_csum_replace(skb, IP_CSUM_OFF, htons(old_tos), htons(new_tos), 2);  in set_ip_tos()
27 	bpf_skb_store_bytes(skb, TOS_OFF, &new_tos, sizeof(new_tos), 0);  in set_ip_tos()
35 static inline void set_tcp_ip_src(struct __sk_buff *skb, __u32 new_ip)  in set_tcp_ip_src()  argument
37 	__u32 old_ip = _htonl(load_word(skb, BPF_LL_OFF + IP_SRC_OFF));  in set_tcp_ip_src()
39 	bpf_l4_csum_replace(skb, TCP_CSUM_OFF, old_ip, new_ip, IS_PSEUDO | sizeof(new_ip));  in set_tcp_ip_src()
40 	bpf_l3_csum_replace(skb, IP_CSUM_OFF, old_ip, new_ip, sizeof(new_ip));  in set_tcp_ip_src()
41 	bpf_skb_store_bytes(skb, IP_SRC_OFF, &new_ip, sizeof(new_ip), 0);  in set_tcp_ip_src()
45 static inline void set_tcp_dest_port(struct __sk_buff *skb, __u16 new_port)  in set_tcp_dest_port()  argument
47 	__u16 old_port = htons(load_half(skb, BPF_LL_OFF + TCP_DPORT_OFF));  in set_tcp_dest_port()
49 	bpf_l4_csum_replace(skb, TCP_CSUM_OFF, old_port, new_port, sizeof(new_port));  in set_tcp_dest_port()
50 	bpf_skb_store_bytes(skb, TCP_DPORT_OFF, &new_port, sizeof(new_port), 0);  in set_tcp_dest_port()
54 int bpf_prog1(struct __sk_buff *skb)  in bpf_prog1()  argument
56 	__u8 proto = load_byte(skb, BPF_LL_OFF + ETH_HLEN + offsetof(struct iphdr, protocol));  in bpf_prog1()
60 		set_ip_tos(skb, 8);  in bpf_prog1()
61 		set_tcp_ip_src(skb, 0xA010101);  in bpf_prog1()
62 		set_tcp_dest_port(skb, 5001);  in bpf_prog1()