2 #include "bpf_helpers.h"
4 #include "bpf_endian.h"
6 int _version SEC("version") = 1;
8 #define bpf_printk(fmt, ...) \
10 char ____fmt[] = fmt; \
11 bpf_trace_printk(____fmt, sizeof(____fmt), \
16 int bpf_prog1(struct __sk_buff *skb)
18 void *data_end = (void *)(long) skb->data_end;
19 void *data = (void *)(long) skb->data;
20 __u32 lport = skb->local_port;
21 __u32 rport = skb->remote_port;
23 __u32 len = (__u32) data_end - (__u32) data;
26 if (data + 10 > data_end) {
27 err = bpf_skb_pull_data(skb, 10);
31 data_end = (void *)(long)skb->data_end;
32 data = (void *)(long)skb->data;
33 if (data + 10 > data_end)
37 /* This write/read is a bit pointless but tests the verifier and
38 * strparser handler for read/write pkt data and access into sk
46 char _license[] SEC("license") = "GPL";