cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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test_xdp_adjust_tail_grow.c (906B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/bpf.h>
      3#include <bpf/bpf_helpers.h>
      4
      5SEC("xdp")
      6int _xdp_adjust_tail_grow(struct xdp_md *xdp)
      7{
      8	void *data_end = (void *)(long)xdp->data_end;
      9	void *data = (void *)(long)xdp->data;
     10	int data_len = bpf_xdp_get_buff_len(xdp);
     11	int offset = 0;
     12
     13	/* Data length determine test case */
     14
     15	if (data_len == 54) { /* sizeof(pkt_v4) */
     16		offset = 4096; /* test too large offset */
     17	} else if (data_len == 74) { /* sizeof(pkt_v6) */
     18		offset = 40;
     19	} else if (data_len == 64) {
     20		offset = 128;
     21	} else if (data_len == 128) {
     22		/* Max tail grow 3520 */
     23		offset = 4096 - 256 - 320 - data_len;
     24	} else if (data_len == 9000) {
     25		offset = 10;
     26	} else if (data_len == 9001) {
     27		offset = 4096;
     28	} else {
     29		return XDP_ABORTED; /* No matching test */
     30	}
     31
     32	if (bpf_xdp_adjust_tail(xdp, offset))
     33		return XDP_DROP;
     34	return XDP_TX;
     35}
     36
     37char _license[] SEC("license") = "GPL";