// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */

#include "vmlinux.h"
#include "bpf_tracing_net.h"
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_helpers.h>

long create_errs = 0;
long create_cnts = 0;
long kmalloc_cnts = 0;
__u32 bench_pid = 0;

struct storage {
        __u8 data[64];
};

struct {
        __uint(type, BPF_MAP_TYPE_SK_STORAGE);
        __uint(map_flags, BPF_F_NO_PREALLOC);
        __type(key, int);
        __type(value, struct storage);
} sk_storage_map SEC(".maps");

struct {
        __uint(type, BPF_MAP_TYPE_TASK_STORAGE);
        __uint(map_flags, BPF_F_NO_PREALLOC);
        __type(key, int);
        __type(value, struct storage);
} task_storage_map SEC(".maps");

SEC("raw_tp/kmalloc")
int BPF_PROG(kmalloc, unsigned long call_site, const void *ptr,
             size_t bytes_req, size_t bytes_alloc, gfp_t gfp_flags,
             int node)
{
        __sync_fetch_and_add(&kmalloc_cnts, 1);

        return 0;
}

SEC("tp_btf/sched_process_fork")
int BPF_PROG(sched_process_fork, struct task_struct *parent, struct task_struct *child)
{
        struct storage *stg;

        if (parent->tgid != bench_pid)
                return 0;

        stg = bpf_task_storage_get(&task_storage_map, child, NULL,
                                   BPF_LOCAL_STORAGE_GET_F_CREATE);
        if (stg)
                __sync_fetch_and_add(&create_cnts, 1);
        else
                __sync_fetch_and_add(&create_errs, 1);

        return 0;
}

SEC("lsm.s/socket_post_create")
int BPF_PROG(socket_post_create, struct socket *sock, int family, int type,
             int protocol, int kern)
{
        struct sock *sk = sock->sk;
        struct storage *stg;
        __u32 pid;

        pid = bpf_get_current_pid_tgid() >> 32;
        if (pid != bench_pid || !sk)
                return 0;

        stg = bpf_sk_storage_get(&sk_storage_map, sk, NULL,
                                 BPF_LOCAL_STORAGE_GET_F_CREATE);

        if (stg)
                __sync_fetch_and_add(&create_cnts, 1);
        else
                __sync_fetch_and_add(&create_errs, 1);

        return 0;
}

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