1#include <linux/bpf.h>
 2#include <bpf/bpf_helpers.h>
 3#include <bpf/bpf_endian.h>
 
 
 4
 5SEC("sk_skb1")
 6int bpf_prog1(struct __sk_buff *skb)
 7{
 8	void *data_end = (void *)(long) skb->data_end;
 9	void *data = (void *)(long) skb->data;
 
 
10	__u8 *d = data;
 
11	int err;
12
13	if (data + 10 > data_end) {
14		err = bpf_skb_pull_data(skb, 10);
15		if (err)
16			return SK_DROP;
17
18		data_end = (void *)(long)skb->data_end;
19		data = (void *)(long)skb->data;
20		if (data + 10 > data_end)
21			return SK_DROP;
22	}
23
24	/* This write/read is a bit pointless but tests the verifier and
25	 * strparser handler for read/write pkt data and access into sk
26	 * fields.
27	 */
28	d = data;
29	d[7] = 1;
30	return skb->len;
31}
32
33char _license[] SEC("license") = "GPL";

 1#include <linux/bpf.h>
 2#include "bpf_helpers.h"
 3#include "bpf_endian.h"
 4
 5int _version SEC("version") = 1;
 6
 7SEC("sk_skb1")
 8int bpf_prog1(struct __sk_buff *skb)
 9{
10	void *data_end = (void *)(long) skb->data_end;
11	void *data = (void *)(long) skb->data;
12	__u32 lport = skb->local_port;
13	__u32 rport = skb->remote_port;
14	__u8 *d = data;
15	__u32 len = (__u32) data_end - (__u32) data;
16	int err;
17
18	if (data + 10 > data_end) {
19		err = bpf_skb_pull_data(skb, 10);
20		if (err)
21			return SK_DROP;
22
23		data_end = (void *)(long)skb->data_end;
24		data = (void *)(long)skb->data;
25		if (data + 10 > data_end)
26			return SK_DROP;
27	}
28
29	/* This write/read is a bit pointless but tests the verifier and
30	 * strparser handler for read/write pkt data and access into sk
31	 * fields.
32	 */
33	d = data;
34	d[7] = 1;
35	return skb->len;
36}
37
38char _license[] SEC("license") = "GPL";