// SPDX-License-Identifier: GPL-2.0 #include <linux/bpf.h> #include <bpf/bpf_helpers.h> struct { __uint(type, BPF_MAP_TYPE_DEVMAP); __uint(key_size, sizeof(__u32)); __uint(value_size, sizeof(struct bpf_devmap_val)); __uint(max_entries, 4); } dm_ports SEC(".maps"); SEC("xdp_redir") int xdp_redir_prog(struct xdp_md *ctx) { return bpf_redirect_map(&dm_ports, 1, 0); } /* invalid program on DEVMAP entry; * SEC name means expected attach type not set */ SEC("xdp_dummy") int xdp_dummy_prog(struct xdp_md *ctx) { return XDP_PASS; } /* valid program on DEVMAP entry via SEC name; * has access to egress and ingress ifindex */ SEC("xdp_devmap/map_prog") int xdp_dummy_dm(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";