// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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SEC("xdp_adjust_tail_grow")
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int _xdp_adjust_tail_grow(struct xdp_md *xdp)
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{
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void *data_end = (void *)(long)xdp->data_end;
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void *data = (void *)(long)xdp->data;
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unsigned int data_len;
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int offset = 0;
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/* Data length determine test case */
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data_len = data_end - data;
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if (data_len == 54) { /* sizeof(pkt_v4) */
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offset = 4096; /* test too large offset */
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} else if (data_len == 74) { /* sizeof(pkt_v6) */
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offset = 40;
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} else if (data_len == 64) {
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offset = 128;
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} else if (data_len == 128) {
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offset = 4096 - 256 - 320 - data_len; /* Max tail grow 3520 */
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} else {
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return XDP_ABORTED; /* No matching test */
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}
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if (bpf_xdp_adjust_tail(xdp, offset))
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return XDP_DROP;
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return XDP_TX;
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}
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char _license[] SEC("license") = "GPL";
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