1 #include <linux/bpf.h> 2 3 #include <bpf/bpf_helpers.h> 4 #include <bpf/bpf_endian.h> 5 6 int _version SEC("version") = 1; 7 8 SEC("sk_msg1") 9 int bpf_prog1(struct sk_msg_md *msg) 10 { 11 void *data_end = (void *)(long) msg->data_end; 12 void *data = (void *)(long) msg->data; 13 14 char *d; 15 16 if (data + 8 > data_end) 17 return SK_DROP; 18 19 bpf_printk("data length %i\n", (__u64)msg->data_end - (__u64)msg->data); 20 d = (char *)data; 21 bpf_printk("hello sendmsg hook %i %i\n", d[0], d[1]); 22 23 return SK_PASS; 24 } 25 26 char _license[] SEC("license") = "GPL"; 27