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")
bpf_testcb(struct bpf_sock_ops * skops)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";
96