tools/testing/selftests/bpf/test_tcpbpf_kern.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stddef.h>
   3 #include <string.h>
   4 #include <linux/bpf.h>
   5 #include <linux/if_ether.h>
   6 #include <linux/if_packet.h>
   7 #include <linux/ip.h>
   8 #include <linux/types.h>
   9 #include <linux/socket.h>
  10 #include <linux/tcp.h>
  11 #include <netinet/in.h>
  12 #include "bpf_helpers.h"
  13 #include "bpf_endian.h"
  14 #include "test_tcpbpf.h"
  15
  16 struct bpf_map_def SEC("maps") global_map = {
  17         .type = BPF_MAP_TYPE_ARRAY,
  18         .key_size = sizeof(__u32),
  19         .value_size = sizeof(struct tcpbpf_globals),
  20         .max_entries = 2,
  21 };
  22
  23 static inline void update_event_map(int event)
  24 {
  25         __u32 key = 0;
  26         struct tcpbpf_globals g, *gp;
  27
  28         gp = bpf_map_lookup_elem(&global_map, &key);
  29         if (gp == NULL) {
  30                 struct tcpbpf_globals g = {0};
  31
  32                 g.event_map |= (1 << event);
  33                 bpf_map_update_elem(&global_map, &key, &g,
  34                             BPF_ANY);
  35         } else {
  36                 g = *gp;
  37                 g.event_map |= (1 << event);
  38                 bpf_map_update_elem(&global_map, &key, &g,
  39                             BPF_ANY);
  40         }
  41 }
  42
  43 int _version SEC("version") = 1;
  44
  45 SEC("sockops")
  46 int bpf_testcb(struct bpf_sock_ops *skops)
  47 {
  48         int rv = -1;
  49         int bad_call_rv = 0;
  50         int good_call_rv = 0;
  51         int op;
  52         int v = 0;
  53
  54         op = (int) skops->op;
  55
  56         update_event_map(op);
  57
  58         switch (op) {
  59         case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
  60                 /* Test failure to set largest cb flag (assumes not defined) */
  61                 bad_call_rv = bpf_sock_ops_cb_flags_set(skops, 0x80);
  62                 /* Set callback */
  63                 good_call_rv = bpf_sock_ops_cb_flags_set(skops,
  64                                                  BPF_SOCK_OPS_STATE_CB_FLAG);
  65                 /* Update results */
  66                 {
  67                         __u32 key = 0;
  68                         struct tcpbpf_globals g, *gp;
  69
  70                         gp = bpf_map_lookup_elem(&global_map, &key);
  71                         if (!gp)
  72                                 break;
  73                         g = *gp;
  74                         g.bad_cb_test_rv = bad_call_rv;
  75                         g.good_cb_test_rv = good_call_rv;
  76                         bpf_map_update_elem(&global_map, &key, &g,
  77                                             BPF_ANY);
  78                 }
  79                 break;
  80         case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
  81                 skops->sk_txhash = 0x12345f;
  82                 v = 0xff;
  83                 rv = bpf_setsockopt(skops, SOL_IPV6, IPV6_TCLASS, &v,
  84                                     sizeof(v));
  85                 break;
  86         case BPF_SOCK_OPS_RTO_CB:
  87                 break;
  88         case BPF_SOCK_OPS_RETRANS_CB:
  89                 break;
  90         case BPF_SOCK_OPS_STATE_CB:
  91                 if (skops->args[1] == BPF_TCP_CLOSE) {
  92                         __u32 key = 0;
  93                         struct tcpbpf_globals g, *gp;
  94
  95                         gp = bpf_map_lookup_elem(&global_map, &key);
  96                         if (!gp)
  97                                 break;
  98                         g = *gp;
  99                         if (skops->args[0] == BPF_TCP_LISTEN) {
 100                                 g.num_listen++;
 101                         } else {
 102                                 g.total_retrans = skops->total_retrans;
 103                                 g.data_segs_in = skops->data_segs_in;
 104                                 g.data_segs_out = skops->data_segs_out;
 105                                 g.bytes_received = skops->bytes_received;
 106                                 g.bytes_acked = skops->bytes_acked;
 107                         }
 108                         bpf_map_update_elem(&global_map, &key, &g,
 109                                             BPF_ANY);
 110                 }
 111                 break;
 112         case BPF_SOCK_OPS_TCP_LISTEN_CB:
 113                 bpf_sock_ops_cb_flags_set(skops, BPF_SOCK_OPS_STATE_CB_FLAG);
 114                 break;
 115         default:
 116                 rv = -1;
 117         }
 118         skops->reply = rv;
 119         return 1;
 120 }
 121 char _license[] SEC("license") = "GPL";