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