1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/bpf.h> 3 #include <bpf/bpf_tracing.h> 4 #include <bpf/bpf_helpers.h> 5 6 char _license[] SEC("license") = "GPL"; 7 8 struct net_device { 9 /* Structure does not need to contain all entries, 10 * as "preserve_access_index" will use BTF to fix this... 11 */ 12 int ifindex; 13 } __attribute__((preserve_access_index)); 14 15 struct xdp_rxq_info { 16 /* Structure does not need to contain all entries, 17 * as "preserve_access_index" will use BTF to fix this... 18 */ 19 struct net_device *dev; 20 __u32 queue_index; 21 } __attribute__((preserve_access_index)); 22 23 struct xdp_buff { 24 void *data; 25 void *data_end; 26 void *data_meta; 27 void *data_hard_start; 28 unsigned long handle; 29 struct xdp_rxq_info *rxq; 30 } __attribute__((preserve_access_index)); 31 32 struct meta { 33 int ifindex; 34 int pkt_len; 35 }; 36 37 struct { 38 __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); 39 __type(key, int); 40 __type(value, int); 41 } perf_buf_map SEC(".maps"); 42 43 __u64 test_result_fentry = 0; 44 SEC("fentry/FUNC") 45 int BPF_PROG(trace_on_entry, struct xdp_buff *xdp) 46 { 47 struct meta meta; 48 void *data_end = (void *)(long)xdp->data_end; 49 void *data = (void *)(long)xdp->data; 50 51 meta.ifindex = xdp->rxq->dev->ifindex; 52 meta.pkt_len = data_end - data; 53 bpf_xdp_output(xdp, &perf_buf_map, 54 ((__u64) meta.pkt_len << 32) | 55 BPF_F_CURRENT_CPU, 56 &meta, sizeof(meta)); 57 58 test_result_fentry = xdp->rxq->dev->ifindex; 59 return 0; 60 } 61 62 __u64 test_result_fexit = 0; 63 SEC("fexit/FUNC") 64 int BPF_PROG(trace_on_exit, struct xdp_buff *xdp, int ret) 65 { 66 test_result_fexit = ret; 67 return 0; 68 } 69