tools/testing/selftests/bpf/progs/test_tcpnotify_kern.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stddef.h>
   3 #include <string.h>
   4 #include <netinet/in.h>
   5 #include <linux/bpf.h>
   6 #include <linux/if_ether.h>
   7 #include <linux/if_packet.h>
   8 #include <linux/ip.h>
   9 #include <linux/ipv6.h>
  10 #include <linux/types.h>
  11 #include <linux/socket.h>
  12 #include <linux/tcp.h>
  13 #include <bpf/bpf_helpers.h>
  14 #include <bpf/bpf_endian.h>
  15 #include "test_tcpnotify.h"
  16
  17 struct {
  18         __uint(type, BPF_MAP_TYPE_ARRAY);
  19         __uint(max_entries, 4);
  20         __type(key, __u32);
  21         __type(value, struct tcpnotify_globals);
  22 } global_map SEC(".maps");
  23
  24 struct {
  25         __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
  26         __uint(max_entries, 2);
  27         __uint(key_size, sizeof(int));
  28         __uint(value_size, sizeof(__u32));
  29 } perf_event_map SEC(".maps");
  30
  31 int _version SEC("version") = 1;
  32
  33 SEC("sockops")
  34 int bpf_testcb(struct bpf_sock_ops *skops)
  35 {
  36         int rv = -1;
  37         int op;
  38
  39         op = (int) skops->op;
  40
  41         if (bpf_ntohl(skops->remote_port) != TESTPORT) {
  42                 skops->reply = -1;
  43                 return 0;
  44         }
  45
  46         switch (op) {
  47         case BPF_SOCK_OPS_TIMEOUT_INIT:
  48         case BPF_SOCK_OPS_RWND_INIT:
  49         case BPF_SOCK_OPS_NEEDS_ECN:
  50         case BPF_SOCK_OPS_BASE_RTT:
  51         case BPF_SOCK_OPS_RTO_CB:
  52                 rv = 1;
  53                 break;
  54
  55         case BPF_SOCK_OPS_TCP_CONNECT_CB:
  56         case BPF_SOCK_OPS_TCP_LISTEN_CB:
  57         case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
  58         case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
  59                 bpf_sock_ops_cb_flags_set(skops, (BPF_SOCK_OPS_RETRANS_CB_FLAG|
  60                                           BPF_SOCK_OPS_RTO_CB_FLAG));
  61                 rv = 1;
  62                 break;
  63         case BPF_SOCK_OPS_RETRANS_CB: {
  64                         __u32 key = 0;
  65                         struct tcpnotify_globals g, *gp;
  66                         struct tcp_notifier msg = {
  67                                 .type = 0xde,
  68                                 .subtype = 0xad,
  69                                 .source = 0xbe,
  70                                 .hash = 0xef,
  71                         };
  72
  73                         rv = 1;
  74
  75                         /* Update results */
  76                         gp = bpf_map_lookup_elem(&global_map, &key);
  77                         if (!gp)
  78                                 break;
  79                         g = *gp;
  80                         g.total_retrans = skops->total_retrans;
  81                         g.ncalls++;
  82                         bpf_map_update_elem(&global_map, &key, &g,
  83                                             BPF_ANY);
  84                         bpf_perf_event_output(skops, &perf_event_map,
  85                                               BPF_F_CURRENT_CPU,
  86                                               &msg, sizeof(msg));
  87                 }
  88                 break;
  89         default:
  90                 rv = -1;
  91         }
  92         skops->reply = rv;
  93         return 1;
  94 }
  95 char _license[] SEC("license") = "GPL";