1 // SPDX-License-Identifier: GPL-2.0-only
2
3 /*
4 * Copyright 2022 Google LLC.
5 */
6
7 #include <linux/bpf.h>
8 #include <bpf/bpf_helpers.h>
9 #include <bpf/bpf_endian.h>
10 #include <netinet/in.h>
11 #include <sys/socket.h>
12
13 /* 2001:db8::1 */
14 #define BINDADDR_V6 { { { 0x20,0x01,0x0d,0xb8,0,0,0,0,0,0,0,0,0,0,0,1 } } }
15
16 __u32 do_bind = 0;
17 __u32 has_error = 0;
18 __u32 invocations_v4 = 0;
19 __u32 invocations_v6 = 0;
20
21 SEC("cgroup/connect4")
connect_v4_prog(struct bpf_sock_addr * ctx)22 int connect_v4_prog(struct bpf_sock_addr *ctx)
23 {
24 struct sockaddr_in sa = {
25 .sin_family = AF_INET,
26 .sin_addr.s_addr = bpf_htonl(0x01010101),
27 };
28
29 __sync_fetch_and_add(&invocations_v4, 1);
30
31 if (do_bind && bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa)))
32 has_error = 1;
33
34 return 1;
35 }
36
37 SEC("cgroup/connect6")
connect_v6_prog(struct bpf_sock_addr * ctx)38 int connect_v6_prog(struct bpf_sock_addr *ctx)
39 {
40 struct sockaddr_in6 sa = {
41 .sin6_family = AF_INET6,
42 .sin6_addr = BINDADDR_V6,
43 };
44
45 __sync_fetch_and_add(&invocations_v6, 1);
46
47 if (do_bind && bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa)))
48 has_error = 1;
49
50 return 1;
51 }
52
53 char _license[] SEC("license") = "GPL";
54