LXR linux/tools/testing/selftests/bpf/sockmap_verdict

   1#include <linux/bpf.h>
   2#include "bpf_helpers.h"
   3#include "bpf_util.h"
   4#include "bpf_endian.h"
   5
   6int _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
  15struct 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
  22struct 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
  29struct 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
  36SEC("sk_skb2")
  37int 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
  68char _license[] SEC("license") = "GPL";
  69