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_with_devmap_helpers.c (1106B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/bpf.h>
      3#include <bpf/bpf_helpers.h>
      4
      5struct {
      6	__uint(type, BPF_MAP_TYPE_DEVMAP);
      7	__uint(key_size, sizeof(__u32));
      8	__uint(value_size, sizeof(struct bpf_devmap_val));
      9	__uint(max_entries, 4);
     10} dm_ports SEC(".maps");
     11
     12SEC("xdp")
     13int xdp_redir_prog(struct xdp_md *ctx)
     14{
     15	return bpf_redirect_map(&dm_ports, 1, 0);
     16}
     17
     18/* invalid program on DEVMAP entry;
     19 * SEC name means expected attach type not set
     20 */
     21SEC("xdp")
     22int xdp_dummy_prog(struct xdp_md *ctx)
     23{
     24	return XDP_PASS;
     25}
     26
     27/* valid program on DEVMAP entry via SEC name;
     28 * has access to egress and ingress ifindex
     29 */
     30SEC("xdp/devmap")
     31int xdp_dummy_dm(struct xdp_md *ctx)
     32{
     33	char fmt[] = "devmap redirect: dev %u -> dev %u len %u\n";
     34	void *data_end = (void *)(long)ctx->data_end;
     35	void *data = (void *)(long)ctx->data;
     36	unsigned int len = data_end - data;
     37
     38	bpf_trace_printk(fmt, sizeof(fmt),
     39			 ctx->ingress_ifindex, ctx->egress_ifindex, len);
     40
     41	return XDP_PASS;
     42}
     43
     44SEC("xdp.frags/devmap")
     45int xdp_dummy_dm_frags(struct xdp_md *ctx)
     46{
     47	return XDP_PASS;
     48}
     49
     50char _license[] SEC("license") = "GPL";