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
9char _license[] SEC("license") = "GPL";
10
11struct {
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
18struct {
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
25struct {
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
35SEC("iter/sockmap")
36int 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