1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2020 Cloudflare */
3 #include "bpf_iter.h"
4 #include "bpf_tracing_net.h"
5 #include <bpf/bpf_helpers.h>
6 #include <bpf/bpf_tracing.h>
7 #include <errno.h>
8 
9 char _license[] SEC("license") = "GPL";
10 
11 struct {
12 	__uint(type, BPF_MAP_TYPE_SOCKMAP);
13 	__uint(max_entries, 64);
14 	__type(key, __u32);
15 	__type(value, __u64);
16 } sockmap SEC(".maps");
17 
18 struct {
19 	__uint(type, BPF_MAP_TYPE_SOCKHASH);
20 	__uint(max_entries, 64);
21 	__type(key, __u32);
22 	__type(value, __u64);
23 } sockhash SEC(".maps");
24 
25 struct {
26 	__uint(type, BPF_MAP_TYPE_SOCKHASH);
27 	__uint(max_entries, 64);
28 	__type(key, __u32);
29 	__type(value, __u64);
30 } dst SEC(".maps");
31 
32 __u32 elems = 0;
33 __u32 socks = 0;
34 
35 SEC("iter/sockmap")
36 int copy(struct bpf_iter__sockmap *ctx)
37 {
38 	struct sock *sk = ctx->sk;
39 	__u32 tmp, *key = ctx->key;
40 	int ret;
41 
42 	if (!key)
43 		return 0;
44 
45 	elems++;
46 
47 	/* We need a temporary buffer on the stack, since the verifier doesn't
48 	 * let us use the pointer from the context as an argument to the helper.
49 	 */
50 	tmp = *key;
51 
52 	if (sk) {
53 		socks++;
54 		return bpf_map_update_elem(&dst, &tmp, sk, 0) != 0;
55 	}
56 
57 	ret = bpf_map_delete_elem(&dst, &tmp);
58 	return ret && ret != -ENOENT;
59 }
60