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/in6.h>
   9 #include <linux/types.h>
  10 #include <linux/socket.h>
  11 #include <linux/tcp.h>
  12 #include <netinet/in.h>
  13 #include "bpf_helpers.h"
  14 #include "bpf_endian.h"
  15 #include "test_tcpbpf.h"
  16
  17 struct bpf_map_def SEC("maps") global_map = {
  18         .type = BPF_MAP_TYPE_ARRAY,
  19         .key_size = sizeof(__u32),
  20         .value_size = sizeof(struct tcpbpf_globals),
  21         .max_entries = 2,
  22 };
  23
  24 static inline void update_event_map(int event)
  25 {
  26         __u32 key = 0;
  27         struct tcpbpf_globals g, *gp;
  28
  29         gp = bpf_map_lookup_elem(&global_map, &key);
  30         if (gp == NULL) {
  31                 struct tcpbpf_globals g = {0};
  32
  33                 g.event_map |= (1 << event);
  34                 bpf_map_update_elem(&global_map, &key, &g,
  35                             BPF_ANY);
  36         } else {
  37                 g = *gp;
  38                 g.event_map |= (1 << event);
  39                 bpf_map_update_elem(&global_map, &key, &g,
  40                             BPF_ANY);
  41         }
  42 }
  43
  44 int _version SEC("version") = 1;
  45
  46 SEC("sockops")
  47 int bpf_testcb(struct bpf_sock_ops *skops)
  48 {
  49         int rv = -1;
  50         int bad_call_rv = 0;
  51         int good_call_rv = 0;
  52         int op;
  53         int v = 0;
  54
  55         op = (int) skops->op;
  56
  57         update_event_map(op);
  58
  59         switch (op) {
  60         case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
  61                 /* Test failure to set largest cb flag (assumes not defined) */
  62                 bad_call_rv = bpf_sock_ops_cb_flags_set(skops, 0x80);
  63                 /* Set callback */
  64                 good_call_rv = bpf_sock_ops_cb_flags_set(skops,
  65                                                  BPF_SOCK_OPS_STATE_CB_FLAG);
  66                 /* Update results */
  67                 {
  68                         __u32 key = 0;
  69                         struct tcpbpf_globals g, *gp;
  70
  71                         gp = bpf_map_lookup_elem(&global_map, &key);
  72                         if (!gp)
  73                                 break;
  74                         g = *gp;
  75                         g.bad_cb_test_rv = bad_call_rv;
  76                         g.good_cb_test_rv = good_call_rv;
  77                         bpf_map_update_elem(&global_map, &key, &g,
  78                                             BPF_ANY);
  79                 }
  80                 break;
  81         case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
  82                 skops->sk_txhash = 0x12345f;
  83                 v = 0xff;
  84                 rv = bpf_setsockopt(skops, SOL_IPV6, IPV6_TCLASS, &v,
  85                                     sizeof(v));
  86                 break;
  87         case BPF_SOCK_OPS_RTO_CB:
  88                 break;
  89         case BPF_SOCK_OPS_RETRANS_CB:
  90                 break;
  91         case BPF_SOCK_OPS_STATE_CB:
  92                 if (skops->args[1] == BPF_TCP_CLOSE) {
  93                         __u32 key = 0;
  94                         struct tcpbpf_globals g, *gp;
  95
  96                         gp = bpf_map_lookup_elem(&global_map, &key);
  97                         if (!gp)
  98                                 break;
  99                         g = *gp;
 100                         g.total_retrans = skops->total_retrans;
 101                         g.data_segs_in = skops->data_segs_in;
 102                         g.data_segs_out = skops->data_segs_out;
 103                         g.bytes_received = skops->bytes_received;
 104                         g.bytes_acked = skops->bytes_acked;
 105                         bpf_map_update_elem(&global_map, &key, &g,
 106                                             BPF_ANY);
 107                 }
 108                 break;
 109         default:
 110                 rv = -1;
 111         }
 112         skops->reply = rv;
 113         return 1;
 114 }
 115 char _license[] SEC("license") = "GPL";