samples/bpf/xdp_redirect_map_multi.bpf.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #define KBUILD_MODNAME "foo"
   3
   4 #include "vmlinux.h"
   5 #include "xdp_sample.bpf.h"
   6 #include "xdp_sample_shared.h"
   7
   8 enum {
   9         BPF_F_BROADCAST         = (1ULL << 3),
  10         BPF_F_EXCLUDE_INGRESS   = (1ULL << 4),
  11 };
  12
  13 struct {
  14         __uint(type, BPF_MAP_TYPE_DEVMAP_HASH);
  15         __uint(key_size, sizeof(int));
  16         __uint(value_size, sizeof(int));
  17         __uint(max_entries, 32);
  18 } forward_map_general SEC(".maps");
  19
  20 struct {
  21         __uint(type, BPF_MAP_TYPE_DEVMAP_HASH);
  22         __uint(key_size, sizeof(int));
  23         __uint(value_size, sizeof(struct bpf_devmap_val));
  24         __uint(max_entries, 32);
  25 } forward_map_native SEC(".maps");
  26
  27 /* map to store egress interfaces mac addresses */
  28 struct {
  29         __uint(type, BPF_MAP_TYPE_HASH);
  30         __type(key, u32);
  31         __type(value, __be64);
  32         __uint(max_entries, 32);
  33 } mac_map SEC(".maps");
  34
  35 static int xdp_redirect_map(struct xdp_md *ctx, void *forward_map)
  36 {
  37         u32 key = bpf_get_smp_processor_id();
  38         struct datarec *rec;
  39
  40         rec = bpf_map_lookup_elem(&rx_cnt, &key);
  41         if (!rec)
  42                 return XDP_PASS;
  43         NO_TEAR_INC(rec->processed);
  44
  45         return bpf_redirect_map(forward_map, 0,
  46                                 BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS);
  47 }
  48
  49 SEC("xdp")
  50 int xdp_redirect_map_general(struct xdp_md *ctx)
  51 {
  52         return xdp_redirect_map(ctx, &forward_map_general);
  53 }
  54
  55 SEC("xdp")
  56 int xdp_redirect_map_native(struct xdp_md *ctx)
  57 {
  58         return xdp_redirect_map(ctx, &forward_map_native);
  59 }
  60
  61 SEC("xdp_devmap/egress")
  62 int xdp_devmap_prog(struct xdp_md *ctx)
  63 {
  64         void *data_end = (void *)(long)ctx->data_end;
  65         void *data = (void *)(long)ctx->data;
  66         u32 key = ctx->egress_ifindex;
  67         struct ethhdr *eth = data;
  68         __be64 *mac;
  69         u64 nh_off;
  70
  71         nh_off = sizeof(*eth);
  72         if (data + nh_off > data_end)
  73                 return XDP_DROP;
  74
  75         mac = bpf_map_lookup_elem(&mac_map, &key);
  76         if (mac)
  77                 __builtin_memcpy(eth->h_source, mac, ETH_ALEN);
  78
  79         return XDP_PASS;
  80 }
  81
  82 char _license[] SEC("license") = "GPL";