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// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_helpers.h>
char _license[] SEC("license") = "GPL";
struct net_device {
/* Structure does not need to contain all entries,
* as "preserve_access_index" will use BTF to fix this...
*/
int ifindex;
} __attribute__((preserve_access_index));
struct xdp_rxq_info {
/* Structure does not need to contain all entries,
* as "preserve_access_index" will use BTF to fix this...
*/
struct net_device *dev;
__u32 queue_index;
} __attribute__((preserve_access_index));
struct xdp_buff {
void *data;
void *data_end;
void *data_meta;
void *data_hard_start;
unsigned long handle;
struct xdp_rxq_info *rxq;
} __attribute__((preserve_access_index));
struct meta {
int ifindex;
int pkt_len;
};
struct {
__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
__uint(key_size, sizeof(int));
__uint(value_size, sizeof(int));
} perf_buf_map SEC(".maps");
__u64 test_result_fentry = 0;
SEC("fentry/FUNC")
int BPF_PROG(trace_on_entry, struct xdp_buff *xdp)
{
struct meta meta;
void *data_end = (void *)(long)xdp->data_end;
void *data = (void *)(long)xdp->data;
meta.ifindex = xdp->rxq->dev->ifindex;
meta.pkt_len = data_end - data;
bpf_xdp_output(xdp, &perf_buf_map,
((__u64) meta.pkt_len << 32) |
BPF_F_CURRENT_CPU,
&meta, sizeof(meta));
test_result_fentry = xdp->rxq->dev->ifindex;
return 0;
}
__u64 test_result_fexit = 0;
SEC("fexit/FUNC")
int BPF_PROG(trace_on_exit, struct xdp_buff *xdp, int ret)
{
test_result_fexit = ret;
return 0;
}
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