bpf/progs/test_xdp_with_devmap_helpers.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <linux/bpf.h>
0003 #include <bpf/bpf_helpers.h>
0004
0005 struct {
0006     __uint(type, BPF_MAP_TYPE_DEVMAP);
0007     __uint(key_size, sizeof(__u32));
0008     __uint(value_size, sizeof(struct bpf_devmap_val));
0009     __uint(max_entries, 4);
0010 } dm_ports SEC(".maps");
0011
0012 SEC("xdp")
0013 int xdp_redir_prog(struct xdp_md *ctx)
0014 {
0015     return bpf_redirect_map(&dm_ports, 1, 0);
0016 }
0017
0018 /* invalid program on DEVMAP entry;
0019  * SEC name means expected attach type not set
0020  */
0021 SEC("xdp")
0022 int xdp_dummy_prog(struct xdp_md *ctx)
0023 {
0024     return XDP_PASS;
0025 }
0026
0027 /* valid program on DEVMAP entry via SEC name;
0028  * has access to egress and ingress ifindex
0029  */
0030 SEC("xdp/devmap")
0031 int xdp_dummy_dm(struct xdp_md *ctx)
0032 {
0033     char fmt[] = "devmap redirect: dev %u -> dev %u len %u\n";
0034     void *data_end = (void *)(long)ctx->data_end;
0035     void *data = (void *)(long)ctx->data;
0036     unsigned int len = data_end - data;
0037
0038     bpf_trace_printk(fmt, sizeof(fmt),
0039              ctx->ingress_ifindex, ctx->egress_ifindex, len);
0040
0041     return XDP_PASS;
0042 }
0043
0044 SEC("xdp.frags/devmap")
0045 int xdp_dummy_dm_frags(struct xdp_md *ctx)
0046 {
0047     return XDP_PASS;
0048 }
0049
0050 char _license[] SEC("license") = "GPL";