// SPDX-License-Identifier: GPL-2.0 /* fails to load without expected_attach_type = BPF_XDP_DEVMAP * because of access to egress_ifindex */ #include <linux/bpf.h> #include <bpf/bpf_helpers.h> SEC("xdp") int xdpdm_devlog(struct xdp_md *ctx) { char fmt[] = "devmap redirect: dev %u -> dev %u len %u\n"; void *data_end = (void *)(long)ctx->data_end; void *data = (void *)(long)ctx->data; unsigned int len = data_end - data; bpf_trace_printk(fmt, sizeof(fmt), ctx->ingress_ifindex, ctx->egress_ifindex, len); return XDP_PASS; } char _license[] SEC("license") = "GPL";