// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Cloudflare */
#include <vmlinux.h>
#include "bpf_tracing_net.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <errno.h>

char _license[] SEC("license") = "GPL";

struct {
        __uint(type, BPF_MAP_TYPE_SOCKMAP);
        __uint(max_entries, 64);
        __type(key, __u32);
        __type(value, __u64);
} sockmap SEC(".maps");

struct {
        __uint(type, BPF_MAP_TYPE_SOCKHASH);
        __uint(max_entries, 64);
        __type(key, __u32);
        __type(value, __u64);
} sockhash SEC(".maps");

struct {
        __uint(type, BPF_MAP_TYPE_SOCKHASH);
        __uint(max_entries, 64);
        __type(key, __u32);
        __type(value, __u64);
} dst SEC(".maps");

__u32 elems = 0;
__u32 socks = 0;

SEC("iter/sockmap")
int copy(struct bpf_iter__sockmap *ctx)
{
        struct sock *sk = ctx->sk;
        __u32 tmp, *key = ctx->key;
        int ret;

        if (!key)
                return 0;

        elems++;

        /* We need a temporary buffer on the stack, since the verifier doesn't
         * let us use the pointer from the context as an argument to the helper.
         */
        tmp = *key;

        if (sk) {
                socks++;
                return bpf_map_update_elem(&dst, &tmp, sk, 0) != 0;
        }

        ret = bpf_map_delete_elem(&dst, &tmp);
        return ret && ret != -ENOENT;
}