Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2
3#include "vmlinux.h"
4#include <bpf/bpf_helpers.h>
5
6int xdpf_sz;
7int sinfo_sz;
8int data_len;
9int pull_len;
10
11#define XDP_PACKET_HEADROOM 256
12
13SEC("xdp.frags")
14int xdp_find_sizes(struct xdp_md *ctx)
15{
16 xdpf_sz = sizeof(struct xdp_frame);
17 sinfo_sz = __PAGE_SIZE - XDP_PACKET_HEADROOM -
18 (ctx->data_end - ctx->data);
19
20 return XDP_PASS;
21}
22
23SEC("xdp.frags")
24int xdp_pull_data_prog(struct xdp_md *ctx)
25{
26 __u8 *data_end = (void *)(long)ctx->data_end;
27 __u8 *data = (void *)(long)ctx->data;
28 __u8 *val_p;
29 int err;
30
31 if (data_len != data_end - data)
32 return XDP_DROP;
33
34 err = bpf_xdp_pull_data(ctx, pull_len);
35 if (err)
36 return XDP_DROP;
37
38 val_p = (void *)(long)ctx->data + 1024;
39 if (val_p + 1 > (void *)(long)ctx->data_end)
40 return XDP_DROP;
41
42 if (*val_p != 0xbb)
43 return XDP_DROP;
44
45 return XDP_PASS;
46}
47
48char _license[] SEC("license") = "GPL";