root/tools/testing/selftests/bpf/progs/sockmap_verdict_prog.c

DEFINITIONS

1. SEC

   1 #include <linux/bpf.h>
   2 #include "bpf_helpers.h"
   3 #include "bpf_endian.h"
   4 
   5 int _version SEC("version") = 1;
   6 
   7 struct {
   8         __uint(type, BPF_MAP_TYPE_SOCKMAP);
   9         __uint(max_entries, 20);
  10         __uint(key_size, sizeof(int));
  11         __uint(value_size, sizeof(int));
  12 } sock_map_rx SEC(".maps");
  13 
  14 struct {
  15         __uint(type, BPF_MAP_TYPE_SOCKMAP);
  16         __uint(max_entries, 20);
  17         __uint(key_size, sizeof(int));
  18         __uint(value_size, sizeof(int));
  19 } sock_map_tx SEC(".maps");
  20 
  21 struct {
  22         __uint(type, BPF_MAP_TYPE_SOCKMAP);
  23         __uint(max_entries, 20);
  24         __uint(key_size, sizeof(int));
  25         __uint(value_size, sizeof(int));
  26 } sock_map_msg SEC(".maps");
  27 
  28 struct {
  29         __uint(type, BPF_MAP_TYPE_ARRAY);
  30         __uint(max_entries, 20);
  31         __type(key, int);
  32         __type(value, int);
  33 } sock_map_break SEC(".maps");
  34 
  35 SEC("sk_skb2")
  36 int bpf_prog2(struct __sk_buff *skb)
  37 {
  38         void *data_end = (void *)(long) skb->data_end;
  39         void *data = (void *)(long) skb->data;
  40         __u32 lport = skb->local_port;
  41         __u32 rport = skb->remote_port;
  42         __u8 *d = data;
  43         __u8 sk, map;
  44 
  45         if (data + 8 > data_end)
  46                 return SK_DROP;
  47 
  48         map = d[0];
  49         sk = d[1];
  50 
  51         d[0] = 0xd;
  52         d[1] = 0xe;
  53         d[2] = 0xa;
  54         d[3] = 0xd;
  55         d[4] = 0xb;
  56         d[5] = 0xe;
  57         d[6] = 0xe;
  58         d[7] = 0xf;
  59 
  60         if (!map)
  61                 return bpf_sk_redirect_map(skb, &sock_map_rx, sk, 0);
  62         return bpf_sk_redirect_map(skb, &sock_map_tx, sk, 0);
  63 }
  64 
  65 char _license[] SEC("license") = "GPL";