42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2017 Facebook
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*/
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#include <stddef.h>
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#include <string.h>
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#include <linux/bpf.h>
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#include <linux/pkt_cls.h>
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#include <bpf/bpf_helpers.h>
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define TEST_FIELD(TYPE, FIELD, MASK) \
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{ \
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TYPE tmp = *(volatile TYPE *)&skb->FIELD; \
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if (tmp != ((*(volatile __u32 *)&skb->FIELD) & MASK)) \
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return TC_ACT_SHOT; \
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}
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#else
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#define TEST_FIELD_OFFSET(a, b) ((sizeof(a) - sizeof(b)) / sizeof(b))
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#define TEST_FIELD(TYPE, FIELD, MASK) \
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{ \
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TYPE tmp = *((volatile TYPE *)&skb->FIELD + \
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TEST_FIELD_OFFSET(skb->FIELD, TYPE)); \
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if (tmp != ((*(volatile __u32 *)&skb->FIELD) & MASK)) \
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return TC_ACT_SHOT; \
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}
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#endif
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SEC("tc")
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int test_pkt_md_access(struct __sk_buff *skb)
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{
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TEST_FIELD(__u8, len, 0xFF);
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TEST_FIELD(__u16, len, 0xFFFF);
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TEST_FIELD(__u32, len, 0xFFFFFFFF);
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TEST_FIELD(__u16, protocol, 0xFFFF);
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TEST_FIELD(__u32, protocol, 0xFFFFFFFF);
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TEST_FIELD(__u8, hash, 0xFF);
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TEST_FIELD(__u16, hash, 0xFFFF);
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TEST_FIELD(__u32, hash, 0xFFFFFFFF);
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return TC_ACT_OK;
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}
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