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         __type(key, int);
  28         __type(value, __u32);
  29 } perf_event_map SEC(".maps");
  30
  31 SEC("sockops")
  32 int bpf_testcb(struct bpf_sock_ops *skops)
  33 {
  34         int rv = -1;
  35         int op;
  36
  37         op = (int) skops->op;
  38
  39         if (bpf_ntohl(skops->remote_port) != TESTPORT) {
  40                 skops->reply = -1;
  41                 return 0;
  42         }
  43
  44         switch (op) {
  45         case BPF_SOCK_OPS_TIMEOUT_INIT:
  46         case BPF_SOCK_OPS_RWND_INIT:
  47         case BPF_SOCK_OPS_NEEDS_ECN:
  48         case BPF_SOCK_OPS_BASE_RTT:
  49         case BPF_SOCK_OPS_RTO_CB:
  50                 rv = 1;
  51                 break;
  52
  53         case BPF_SOCK_OPS_TCP_CONNECT_CB:
  54         case BPF_SOCK_OPS_TCP_LISTEN_CB:
  55         case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
  56         case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
  57                 bpf_sock_ops_cb_flags_set(skops, (BPF_SOCK_OPS_RETRANS_CB_FLAG|
  58                                           BPF_SOCK_OPS_RTO_CB_FLAG));
  59                 rv = 1;
  60                 break;
  61         case BPF_SOCK_OPS_RETRANS_CB: {
  62                         __u32 key = 0;
  63                         struct tcpnotify_globals g, *gp;
  64                         struct tcp_notifier msg = {
  65                                 .type = 0xde,
  66                                 .subtype = 0xad,
  67                                 .source = 0xbe,
  68                                 .hash = 0xef,
  69                         };
  70
  71                         rv = 1;
  72
  73                         /* Update results */
  74                         gp = bpf_map_lookup_elem(&global_map, &key);
  75                         if (!gp)
  76                                 break;
  77                         g = *gp;
  78                         g.total_retrans = skops->total_retrans;
  79                         g.ncalls++;
  80                         bpf_map_update_elem(&global_map, &key, &g,
  81                                             BPF_ANY);
  82                         bpf_perf_event_output(skops, &perf_event_map,
  83                                               BPF_F_CURRENT_CPU,
  84                                               &msg, sizeof(msg));
  85                 }
  86                 break;
  87         default:
  88                 rv = -1;
  89         }
  90         skops->reply = rv;
  91         return 1;
  92 }
  93 char _license[] SEC("license") = "GPL";