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")
bpf_testcb(struct bpf_sock_ops * skops)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";
94