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_msg = {
  30         .type = BPF_MAP_TYPE_SOCKMAP,
  31         .key_size = sizeof(int),
  32         .value_size = sizeof(int),
  33         .max_entries = 20,
  34 };
  35
  36 struct bpf_map_def SEC("maps") sock_map_break = {
  37         .type = BPF_MAP_TYPE_ARRAY,
  38         .key_size = sizeof(int),
  39         .value_size = sizeof(int),
  40         .max_entries = 20,
  41 };
  42
  43 SEC("sk_skb2")
  44 int bpf_prog2(struct __sk_buff *skb)
  45 {
  46         void *data_end = (void *)(long) skb->data_end;
  47         void *data = (void *)(long) skb->data;
  48         __u32 lport = skb->local_port;
  49         __u32 rport = skb->remote_port;
  50         __u8 *d = data;
  51         __u8 sk, map;
  52
  53         if (data + 8 > data_end)
  54                 return SK_DROP;
  55
  56         map = d[0];
  57         sk = d[1];
  58
  59         d[0] = 0xd;
  60         d[1] = 0xe;
  61         d[2] = 0xa;
  62         d[3] = 0xd;
  63         d[4] = 0xb;
  64         d[5] = 0xe;
  65         d[6] = 0xe;
  66         d[7] = 0xf;
  67
  68         if (!map)
  69                 return bpf_sk_redirect_map(skb, &sock_map_rx, sk, 0);
  70         return bpf_sk_redirect_map(skb, &sock_map_tx, sk, 0);
  71 }
  72
  73 char _license[] SEC("license") = "GPL";