dd65acf72d
Since commit 6c4fc209fc ("bpf: remove useless version check for prog
load") these "version" sections, which result in bpf_attr.kern_version
being set, have been unnecessary.
Remove them so that it's obvious to folks using selftests as a guide that
"modern" BPF progs don't need this section.
Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211007231234.2223081-1-davemarchevsky@fb.com
36 lines
770 B
C
36 lines
770 B
C
#include <linux/bpf.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <bpf/bpf_endian.h>
|
|
|
|
SEC("sk_skb1")
|
|
int bpf_prog1(struct __sk_buff *skb)
|
|
{
|
|
void *data_end = (void *)(long) skb->data_end;
|
|
void *data = (void *)(long) skb->data;
|
|
__u32 lport = skb->local_port;
|
|
__u32 rport = skb->remote_port;
|
|
__u8 *d = data;
|
|
int err;
|
|
|
|
if (data + 10 > data_end) {
|
|
err = bpf_skb_pull_data(skb, 10);
|
|
if (err)
|
|
return SK_DROP;
|
|
|
|
data_end = (void *)(long)skb->data_end;
|
|
data = (void *)(long)skb->data;
|
|
if (data + 10 > data_end)
|
|
return SK_DROP;
|
|
}
|
|
|
|
/* This write/read is a bit pointless but tests the verifier and
|
|
* strparser handler for read/write pkt data and access into sk
|
|
* fields.
|
|
*/
|
|
d = data;
|
|
d[7] = 1;
|
|
return skb->len;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|