1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/bpf.h> 3 #include <bpf/bpf_helpers.h> 4 5 struct { 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 12 SEC("xdp") 13 int 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 */ 21 SEC("xdp") 22 int 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 */ 30 SEC("xdp_devmap/map_prog") 31 int 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 char _license[] SEC("license") = "GPL"; 44