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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Facebook */
#include "vmlinux.h"
#include "bpf_tracing_net.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>
void *local_storage_ptr = NULL;
void *sk_ptr = NULL;
int cookie_found = 0;
__u64 cookie = 0;
__u32 omem = 0;
struct {
__uint(type, BPF_MAP_TYPE_SK_STORAGE);
__uint(map_flags, BPF_F_NO_PREALLOC);
__type(key, int);
__type(value, int);
} sk_storage SEC(".maps");
SEC("fexit/bpf_local_storage_destroy")
int BPF_PROG(bpf_local_storage_destroy, struct bpf_local_storage *local_storage)
{
struct sock *sk;
if (local_storage_ptr != local_storage)
return 0;
sk = bpf_core_cast(sk_ptr, struct sock);
if (sk->sk_cookie.counter != cookie)
return 0;
cookie_found++;
omem = sk->sk_omem_alloc.counter;
local_storage_ptr = NULL;
return 0;
}
SEC("fentry/inet6_sock_destruct")
int BPF_PROG(inet6_sock_destruct, struct sock *sk)
{
int *value;
if (!cookie || sk->sk_cookie.counter != cookie)
return 0;
value = bpf_sk_storage_get(&sk_storage, sk, 0, 0);
if (value && *value == 0xdeadbeef) {
cookie_found++;
sk_ptr = sk;
local_storage_ptr = sk->sk_bpf_storage;
}
return 0;
}
char _license[] SEC("license") = "GPL";
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