tools/testing/selftests/bpf/sockmap_verdict_prog.c

   1 #include <linux/bpf.h>
   2 #include "bpf_helpers.h"
   3 #include "bpf_util.h"
   4 #include "bpf_endian.h"
   5
   6 int _version SEC("version") = 1;
   7
   8 #define bpf_printk(fmt, ...)                                    \
   9 ({                                                              \
  10                char ____fmt[] = fmt;                            \
  11                bpf_trace_printk(____fmt, sizeof(____fmt),       \
  12                                 ##__VA_ARGS__);                 \
  13 })
  14
  15 struct bpf_map_def SEC("maps") sock_map_rx = {
  16         .type = BPF_MAP_TYPE_SOCKMAP,
  17         .key_size = sizeof(int),
  18         .value_size = sizeof(int),
  19         .max_entries = 20,
  20 };
  21
  22 struct bpf_map_def SEC("maps") sock_map_tx = {
  23         .type = BPF_MAP_TYPE_SOCKMAP,
  24         .key_size = sizeof(int),
  25         .value_size = sizeof(int),
  26         .max_entries = 20,
  27 };
  28
  29 struct bpf_map_def SEC("maps") sock_map_break = {
  30         .type = BPF_MAP_TYPE_ARRAY,
  31         .key_size = sizeof(int),
  32         .value_size = sizeof(int),
  33         .max_entries = 20,
  34 };
  35
  36 SEC("sk_skb2")
  37 int bpf_prog2(struct __sk_buff *skb)
  38 {
  39         void *data_end = (void *)(long) skb->data_end;
  40         void *data = (void *)(long) skb->data;
  41         __u32 lport = skb->local_port;
  42         __u32 rport = skb->remote_port;
  43         __u8 *d = data;
  44         __u8 sk, map;
  45
  46         if (data + 8 > data_end)
  47                 return SK_DROP;
  48
  49         map = d[0];
  50         sk = d[1];
  51
  52         d[0] = 0xd;
  53         d[1] = 0xe;
  54         d[2] = 0xa;
  55         d[3] = 0xd;
  56         d[4] = 0xb;
  57         d[5] = 0xe;
  58         d[6] = 0xe;
  59         d[7] = 0xf;
  60
  61         bpf_printk("verdict: data[0] = redir(%u:%u)\n", map, sk);
  62
  63         if (!map)
  64                 return bpf_sk_redirect_map(skb, &sock_map_rx, sk, 0);
  65         return bpf_sk_redirect_map(skb, &sock_map_tx, sk, 0);
  66 }
  67
  68 char _license[] SEC("license") = "GPL";