+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-#define KBUILD_MODNAME "foo"
-#include <uapi/linux/bpf.h>
-#include <linux/in.h>
-#include <linux/if_ether.h>
-#include <linux/ip.h>
-#include <linux/ipv6.h>
-#include <bpf/bpf_helpers.h>
-
-struct {
- __uint(type, BPF_MAP_TYPE_DEVMAP_HASH);
- __uint(key_size, sizeof(int));
- __uint(value_size, sizeof(int));
- __uint(max_entries, 32);
-} forward_map_general SEC(".maps");
-
-struct {
- __uint(type, BPF_MAP_TYPE_DEVMAP_HASH);
- __uint(key_size, sizeof(int));
- __uint(value_size, sizeof(struct bpf_devmap_val));
- __uint(max_entries, 32);
-} forward_map_native SEC(".maps");
-
-struct {
- __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
- __type(key, u32);
- __type(value, long);
- __uint(max_entries, 1);
-} rxcnt SEC(".maps");
-
-/* map to store egress interfaces mac addresses, set the
- * max_entries to 1 and extend it in user sapce prog.
- */
-struct {
- __uint(type, BPF_MAP_TYPE_ARRAY);
- __type(key, u32);
- __type(value, __be64);
- __uint(max_entries, 1);
-} mac_map SEC(".maps");
-
-static int xdp_redirect_map(struct xdp_md *ctx, void *forward_map)
-{
- long *value;
- u32 key = 0;
-
- /* count packet in global counter */
- value = bpf_map_lookup_elem(&rxcnt, &key);
- if (value)
- *value += 1;
-
- return bpf_redirect_map(forward_map, key,
- BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS);
-}
-
-SEC("xdp_redirect_general")
-int xdp_redirect_map_general(struct xdp_md *ctx)
-{
- return xdp_redirect_map(ctx, &forward_map_general);
-}
-
-SEC("xdp_redirect_native")
-int xdp_redirect_map_native(struct xdp_md *ctx)
-{
- return xdp_redirect_map(ctx, &forward_map_native);
-}
-
-SEC("xdp_devmap/map_prog")
-int xdp_devmap_prog(struct xdp_md *ctx)
-{
- void *data_end = (void *)(long)ctx->data_end;
- void *data = (void *)(long)ctx->data;
- u32 key = ctx->egress_ifindex;
- struct ethhdr *eth = data;
- __be64 *mac;
- u64 nh_off;
-
- nh_off = sizeof(*eth);
- if (data + nh_off > data_end)
- return XDP_DROP;
-
- mac = bpf_map_lookup_elem(&mac_map, &key);
- if (mac)
- __builtin_memcpy(eth->h_source, mac, ETH_ALEN);
-
- return XDP_PASS;
-}
-
-char _license[] SEC("license") = "GPL";