treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206
[muen/linux.git] / tools / testing / selftests / bpf / progs / test_pkt_md_access.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2017 Facebook
3  */
4 #include <stddef.h>
5 #include <string.h>
6 #include <linux/bpf.h>
7 #include <linux/pkt_cls.h>
8 #include "bpf_helpers.h"
9
10 int _version SEC("version") = 1;
11
12 #if  __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
13 #define TEST_FIELD(TYPE, FIELD, MASK)                                   \
14         {                                                               \
15                 TYPE tmp = *(volatile TYPE *)&skb->FIELD;               \
16                 if (tmp != ((*(volatile __u32 *)&skb->FIELD) & MASK))   \
17                         return TC_ACT_SHOT;                             \
18         }
19 #else
20 #define TEST_FIELD_OFFSET(a, b) ((sizeof(a) - sizeof(b)) / sizeof(b))
21 #define TEST_FIELD(TYPE, FIELD, MASK)                                   \
22         {                                                               \
23                 TYPE tmp = *((volatile TYPE *)&skb->FIELD +             \
24                               TEST_FIELD_OFFSET(skb->FIELD, TYPE));     \
25                 if (tmp != ((*(volatile __u32 *)&skb->FIELD) & MASK))   \
26                         return TC_ACT_SHOT;                             \
27         }
28 #endif
29
30 SEC("test1")
31 int process(struct __sk_buff *skb)
32 {
33         TEST_FIELD(__u8,  len, 0xFF);
34         TEST_FIELD(__u16, len, 0xFFFF);
35         TEST_FIELD(__u32, len, 0xFFFFFFFF);
36         TEST_FIELD(__u16, protocol, 0xFFFF);
37         TEST_FIELD(__u32, protocol, 0xFFFFFFFF);
38         TEST_FIELD(__u8,  hash, 0xFF);
39         TEST_FIELD(__u16, hash, 0xFFFF);
40         TEST_FIELD(__u32, hash, 0xFFFFFFFF);
41
42         return TC_ACT_OK;
43 }