// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2017 - 2018 Covalent IO, Inc. http://covalent.io */

#include <linux/skmsg.h>
#include <linux/filter.h>
#include <linux/bpf.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/util_macros.h>

#include <net/inet_common.h>
#include <net/tls.h>
#include <asm/ioctls.h>

void tcp_eat_skb(struct sock *sk, struct sk_buff *skb)
{
        struct tcp_sock *tcp;
        int copied;

        if (!skb || !skb->len || !sk_is_tcp(sk))
                return;

        if (skb_bpf_strparser(skb))
                return;

        tcp = tcp_sk(sk);
        copied = tcp->copied_seq + skb->len;
        WRITE_ONCE(tcp->copied_seq, copied);
        tcp_rcv_space_adjust(sk);
        __tcp_cleanup_rbuf(sk, skb->len);
}

static int bpf_tcp_ingress(struct sock *sk, struct sk_psock *psock,
                           struct sk_msg *msg, u32 apply_bytes)
{
        bool apply = apply_bytes;
        struct scatterlist *sge;
        u32 size, copied = 0;
        struct sk_msg *tmp;
        int i, ret = 0;

        tmp = kzalloc_obj(*tmp, __GFP_NOWARN | GFP_KERNEL);
        if (unlikely(!tmp))
                return -ENOMEM;

        lock_sock(sk);
        tmp->sg.start = msg->sg.start;
        i = msg->sg.start;
        do {
                sge = sk_msg_elem(msg, i);
                size = (apply && apply_bytes < sge->length) ?
                        apply_bytes : sge->length;
                if (!__sk_rmem_schedule(sk, size, false)) {
                        if (!copied)
                                ret = -ENOMEM;
                        break;
                }

                sk_mem_charge(sk, size);
                atomic_add(size, &sk->sk_rmem_alloc);
                sk_msg_xfer(tmp, msg, i, size);
                copied += size;
                if (sge->length)
                        get_page(sk_msg_page(tmp, i));
                sk_msg_iter_var_next(i);
                tmp->sg.end = i;
                if (apply) {
                        apply_bytes -= size;
                        if (!apply_bytes) {
                                if (sge->length)
                                        sk_msg_iter_var_prev(i);
                                break;
                        }
                }
        } while (i != msg->sg.end);

        if (!ret) {
                msg->sg.start = i;
                if (!sk_psock_queue_msg(psock, tmp))
                        atomic_sub(copied, &sk->sk_rmem_alloc);
                sk_psock_data_ready(sk, psock);
        } else {
                sk_msg_free(sk, tmp);
                kfree(tmp);
        }

        release_sock(sk);
        return ret;
}

static int tcp_bpf_push(struct sock *sk, struct sk_msg *msg, u32 apply_bytes,
                        int flags, bool uncharge)
{
        struct msghdr msghdr = {};
        bool apply = apply_bytes;
        struct scatterlist *sge;
        struct page *page;
        int size, ret = 0;
        u32 off;

        while (1) {
                struct bio_vec bvec;
                bool has_tx_ulp;

                sge = sk_msg_elem(msg, msg->sg.start);
                size = (apply && apply_bytes < sge->length) ?
                        apply_bytes : sge->length;
                off  = sge->offset;
                page = sg_page(sge);

                tcp_rate_check_app_limited(sk);
retry:
                msghdr.msg_flags = flags | MSG_SPLICE_PAGES;
                has_tx_ulp = tls_sw_has_ctx_tx(sk);
                if (has_tx_ulp)
                        msghdr.msg_flags |= MSG_SENDPAGE_NOPOLICY;

                if (size < sge->length && msg->sg.start != msg->sg.end)
                        msghdr.msg_flags |= MSG_MORE;

                bvec_set_page(&bvec, page, size, off);
                iov_iter_bvec(&msghdr.msg_iter, ITER_SOURCE, &bvec, 1, size);
                ret = tcp_sendmsg_locked(sk, &msghdr, size);
                if (ret <= 0)
                        return ret;

                if (apply)
                        apply_bytes -= ret;
                msg->sg.size -= ret;
                sge->offset += ret;
                sge->length -= ret;
                if (uncharge)
                        sk_mem_uncharge(sk, ret);
                if (ret != size) {
                        size -= ret;
                        off  += ret;
                        goto retry;
                }
                if (!sge->length) {
                        put_page(page);
                        sk_msg_iter_next(msg, start);
                        sg_init_table(sge, 1);
                        if (msg->sg.start == msg->sg.end)
                                break;
                }
                if (apply && !apply_bytes)
                        break;
        }

        return 0;
}

static int tcp_bpf_push_locked(struct sock *sk, struct sk_msg *msg,
                               u32 apply_bytes, int flags, bool uncharge)
{
        int ret;

        lock_sock(sk);
        ret = tcp_bpf_push(sk, msg, apply_bytes, flags, uncharge);
        release_sock(sk);
        return ret;
}

int tcp_bpf_sendmsg_redir(struct sock *sk, bool ingress,
                          struct sk_msg *msg, u32 bytes, int flags)
{
        struct sk_psock *psock = sk_psock_get(sk);
        int ret;

        if (unlikely(!psock))
                return -EPIPE;

        ret = ingress ? bpf_tcp_ingress(sk, psock, msg, bytes) :
                        tcp_bpf_push_locked(sk, msg, bytes, flags, false);
        sk_psock_put(sk, psock);
        return ret;
}
EXPORT_SYMBOL_GPL(tcp_bpf_sendmsg_redir);

#ifdef CONFIG_BPF_SYSCALL
static int tcp_msg_wait_data(struct sock *sk, struct sk_psock *psock,
                             long timeo)
{
        DEFINE_WAIT_FUNC(wait, woken_wake_function);
        int ret = 0;

        if (sk->sk_shutdown & RCV_SHUTDOWN)
                return 1;

        if (!timeo)
                return ret;

        add_wait_queue(sk_sleep(sk), &wait);
        sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
        ret = sk_wait_event(sk, &timeo,
                            !list_empty(&psock->ingress_msg) ||
                            !skb_queue_empty_lockless(&sk->sk_receive_queue), &wait);
        sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
        remove_wait_queue(sk_sleep(sk), &wait);
        return ret;
}

static bool is_next_msg_fin(struct sk_psock *psock)
{
        struct scatterlist *sge;
        struct sk_msg *msg_rx;
        int i;

        msg_rx = sk_psock_peek_msg(psock);
        i = msg_rx->sg.start;
        sge = sk_msg_elem(msg_rx, i);
        if (!sge->length) {
                struct sk_buff *skb = msg_rx->skb;

                if (skb && TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)
                        return true;
        }
        return false;
}

static int tcp_bpf_recvmsg_parser(struct sock *sk,
                                  struct msghdr *msg,
                                  size_t len,
                                  int flags,
                                  int *addr_len)
{
        int peek = flags & MSG_PEEK;
        struct sk_psock *psock;
        struct tcp_sock *tcp;
        int copied_from_self = 0;
        int copied = 0;
        u32 seq;

        if (unlikely(flags & MSG_ERRQUEUE))
                return inet_recv_error(sk, msg, len, addr_len);

        if (!len)
                return 0;

        psock = sk_psock_get(sk);
        if (unlikely(!psock))
                return tcp_recvmsg(sk, msg, len, flags, addr_len);

        lock_sock(sk);
        tcp = tcp_sk(sk);
        seq = tcp->copied_seq;
        /* We may have received data on the sk_receive_queue pre-accept and
         * then we can not use read_skb in this context because we haven't
         * assigned a sk_socket yet so have no link to the ops. The work-around
         * is to check the sk_receive_queue and in these cases read skbs off
         * queue again. The read_skb hook is not running at this point because
         * of lock_sock so we avoid having multiple runners in read_skb.
         */
        if (unlikely(!skb_queue_empty(&sk->sk_receive_queue))) {
                tcp_data_ready(sk);
                /* This handles the ENOMEM errors if we both receive data
                 * pre accept and are already under memory pressure. At least
                 * let user know to retry.
                 */
                if (unlikely(!skb_queue_empty(&sk->sk_receive_queue))) {
                        copied = -EAGAIN;
                        goto out;
                }
        }

msg_bytes_ready:
        copied = __sk_msg_recvmsg(sk, psock, msg, len, flags, &copied_from_self);
        /* The typical case for EFAULT is the socket was gracefully
         * shutdown with a FIN pkt. So check here the other case is
         * some error on copy_page_to_iter which would be unexpected.
         * On fin return correct return code to zero.
         */
        if (copied == -EFAULT) {
                bool is_fin = is_next_msg_fin(psock);

                if (is_fin) {
                        copied = 0;
                        seq++;
                        goto out;
                }
        }
        seq += copied_from_self;
        if (!copied) {
                long timeo;
                int data;

                if (sock_flag(sk, SOCK_DONE))
                        goto out;

                if (sk->sk_err) {
                        copied = sock_error(sk);
                        goto out;
                }

                if (sk->sk_shutdown & RCV_SHUTDOWN)
                        goto out;

                if (sk->sk_state == TCP_CLOSE) {
                        copied = -ENOTCONN;
                        goto out;
                }

                timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
                if (!timeo) {
                        copied = -EAGAIN;
                        goto out;
                }

                if (signal_pending(current)) {
                        copied = sock_intr_errno(timeo);
                        goto out;
                }

                data = tcp_msg_wait_data(sk, psock, timeo);
                if (data < 0) {
                        copied = data;
                        goto unlock;
                }
                if (data && !sk_psock_queue_empty(psock))
                        goto msg_bytes_ready;
                copied = -EAGAIN;
        }
out:
        if (!peek)
                WRITE_ONCE(tcp->copied_seq, seq);
        tcp_rcv_space_adjust(sk);
        if (copied > 0)
                __tcp_cleanup_rbuf(sk, copied);

unlock:
        release_sock(sk);
        sk_psock_put(sk, psock);
        return copied;
}

static int tcp_bpf_ioctl(struct sock *sk, int cmd, int *karg)
{
        bool slow;

        if (cmd != SIOCINQ)
                return tcp_ioctl(sk, cmd, karg);

        /* works similar as tcp_ioctl */
        if (sk->sk_state == TCP_LISTEN)
                return -EINVAL;

        slow = lock_sock_fast(sk);
        *karg = sk_psock_msg_inq(sk);
        unlock_sock_fast(sk, slow);

        return 0;
}

static int tcp_bpf_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
                           int flags, int *addr_len)
{
        struct sk_psock *psock;
        int copied, ret;

        if (unlikely(flags & MSG_ERRQUEUE))
                return inet_recv_error(sk, msg, len, addr_len);

        if (!len)
                return 0;

        psock = sk_psock_get(sk);
        if (unlikely(!psock))
                return tcp_recvmsg(sk, msg, len, flags, addr_len);
        if (!skb_queue_empty(&sk->sk_receive_queue) &&
            sk_psock_queue_empty(psock)) {
                sk_psock_put(sk, psock);
                return tcp_recvmsg(sk, msg, len, flags, addr_len);
        }
        lock_sock(sk);
msg_bytes_ready:
        copied = sk_msg_recvmsg(sk, psock, msg, len, flags);
        if (!copied) {
                long timeo;
                int data;

                timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
                data = tcp_msg_wait_data(sk, psock, timeo);
                if (data < 0) {
                        ret = data;
                        goto unlock;
                }
                if (data) {
                        if (!sk_psock_queue_empty(psock))
                                goto msg_bytes_ready;
                        release_sock(sk);
                        sk_psock_put(sk, psock);
                        return tcp_recvmsg(sk, msg, len, flags, addr_len);
                }
                copied = -EAGAIN;
        }
        ret = copied;

unlock:
        release_sock(sk);
        sk_psock_put(sk, psock);
        return ret;
}

static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock,
                                struct sk_msg *msg, int *copied, int flags)
{
        bool cork = false, enospc = sk_msg_full(msg), redir_ingress;
        struct sock *sk_redir;
        u32 tosend, origsize, sent, delta = 0;
        u32 eval;
        int ret;

more_data:
        if (psock->eval == __SK_NONE) {
                /* Track delta in msg size to add/subtract it on SK_DROP from
                 * returned to user copied size. This ensures user doesn't
                 * get a positive return code with msg_cut_data and SK_DROP
                 * verdict.
                 */
                delta = msg->sg.size;
                psock->eval = sk_psock_msg_verdict(sk, psock, msg);
                delta -= msg->sg.size;
        }

        if (msg->cork_bytes &&
            msg->cork_bytes > msg->sg.size && !enospc) {
                psock->cork_bytes = msg->cork_bytes - msg->sg.size;
                if (!psock->cork) {
                        psock->cork = kzalloc_obj(*psock->cork,
                                                  GFP_ATOMIC | __GFP_NOWARN);
                        if (!psock->cork) {
                                sk_msg_free(sk, msg);
                                *copied = 0;
                                return -ENOMEM;
                        }
                }
                memcpy(psock->cork, msg, sizeof(*msg));
                return 0;
        }

        tosend = msg->sg.size;
        if (psock->apply_bytes && psock->apply_bytes < tosend)
                tosend = psock->apply_bytes;
        eval = __SK_NONE;

        switch (psock->eval) {
        case __SK_PASS:
                ret = tcp_bpf_push(sk, msg, tosend, flags, true);
                if (unlikely(ret)) {
                        *copied -= sk_msg_free(sk, msg);
                        break;
                }
                sk_msg_apply_bytes(psock, tosend);
                break;
        case __SK_REDIRECT:
                redir_ingress = psock->redir_ingress;
                sk_redir = psock->sk_redir;
                sk_msg_apply_bytes(psock, tosend);
                if (!psock->apply_bytes) {
                        /* Clean up before releasing the sock lock. */
                        eval = psock->eval;
                        psock->eval = __SK_NONE;
                        psock->sk_redir = NULL;
                }
                if (psock->cork) {
                        cork = true;
                        psock->cork = NULL;
                }
                release_sock(sk);

                origsize = msg->sg.size;
                ret = tcp_bpf_sendmsg_redir(sk_redir, redir_ingress,
                                            msg, tosend, flags);
                sent = origsize - msg->sg.size;

                if (eval == __SK_REDIRECT)
                        sock_put(sk_redir);

                lock_sock(sk);
                sk_mem_uncharge(sk, sent);
                if (unlikely(ret < 0)) {
                        int free = sk_msg_free(sk, msg);

                        if (!cork)
                                *copied -= free;
                }
                if (cork) {
                        sk_msg_free(sk, msg);
                        kfree(msg);
                        msg = NULL;
                        ret = 0;
                }
                break;
        case __SK_DROP:
        default:
                sk_msg_free(sk, msg);
                sk_msg_apply_bytes(psock, tosend);
                *copied -= (tosend + delta);
                return -EACCES;
        }

        if (likely(!ret)) {
                if (!psock->apply_bytes) {
                        psock->eval =  __SK_NONE;
                        if (psock->sk_redir) {
                                sock_put(psock->sk_redir);
                                psock->sk_redir = NULL;
                        }
                }
                if (msg &&
                    msg->sg.data[msg->sg.start].page_link &&
                    msg->sg.data[msg->sg.start].length)
                        goto more_data;
        }
        return ret;
}

static int tcp_bpf_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
{
        struct sk_msg tmp, *msg_tx = NULL;
        int copied = 0, err = 0, ret = 0;
        struct sk_psock *psock;
        long timeo;
        int flags;

        /* Don't let internal flags through */
        flags = (msg->msg_flags & ~MSG_SENDPAGE_DECRYPTED);
        flags |= MSG_NO_SHARED_FRAGS;

        psock = sk_psock_get(sk);
        if (unlikely(!psock))
                return tcp_sendmsg(sk, msg, size);

        lock_sock(sk);
        timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
        while (msg_data_left(msg)) {
                bool enospc = false;
                u32 copy, osize;

                if (sk->sk_err) {
                        err = -sk->sk_err;
                        goto out_err;
                }

                copy = msg_data_left(msg);
                if (!sk_stream_memory_free(sk))
                        goto wait_for_sndbuf;
                if (psock->cork) {
                        msg_tx = psock->cork;
                } else {
                        msg_tx = &tmp;
                        sk_msg_init(msg_tx);
                }

                osize = msg_tx->sg.size;
                err = sk_msg_alloc(sk, msg_tx, msg_tx->sg.size + copy, msg_tx->sg.end - 1);
                if (err) {
                        if (err != -ENOSPC)
                                goto wait_for_memory;
                        enospc = true;
                        copy = msg_tx->sg.size - osize;
                }

                ret = sk_msg_memcopy_from_iter(sk, &msg->msg_iter, msg_tx,
                                               copy);
                if (ret < 0) {
                        sk_msg_trim(sk, msg_tx, osize);
                        goto out_err;
                }

                copied += ret;
                if (psock->cork_bytes) {
                        if (size > psock->cork_bytes)
                                psock->cork_bytes = 0;
                        else
                                psock->cork_bytes -= size;
                        if (psock->cork_bytes && !enospc)
                                goto out_err;
                        /* All cork bytes are accounted, rerun the prog. */
                        psock->eval = __SK_NONE;
                        psock->cork_bytes = 0;
                }

                err = tcp_bpf_send_verdict(sk, psock, msg_tx, &copied, flags);
                if (unlikely(err < 0))
                        goto out_err;
                continue;
wait_for_sndbuf:
                set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
wait_for_memory:
                err = sk_stream_wait_memory(sk, &timeo);
                if (err) {
                        if (msg_tx && msg_tx != psock->cork)
                                sk_msg_free(sk, msg_tx);
                        goto out_err;
                }
        }
out_err:
        if (err < 0)
                err = sk_stream_error(sk, msg->msg_flags, err);
        release_sock(sk);
        sk_psock_put(sk, psock);
        return copied > 0 ? copied : err;
}

enum {
        TCP_BPF_IPV4,
        TCP_BPF_IPV6,
        TCP_BPF_NUM_PROTS,
};

enum {
        TCP_BPF_BASE,
        TCP_BPF_TX,
        TCP_BPF_RX,
        TCP_BPF_TXRX,
        TCP_BPF_NUM_CFGS,
};

static struct proto *tcpv6_prot_saved __read_mostly;
static DEFINE_SPINLOCK(tcpv6_prot_lock);
static struct proto tcp_bpf_prots[TCP_BPF_NUM_PROTS][TCP_BPF_NUM_CFGS];

static void tcp_bpf_rebuild_protos(struct proto prot[TCP_BPF_NUM_CFGS],
                                   struct proto *base)
{
        prot[TCP_BPF_BASE]                      = *base;
        prot[TCP_BPF_BASE].destroy              = sock_map_destroy;
        prot[TCP_BPF_BASE].close                = sock_map_close;
        prot[TCP_BPF_BASE].recvmsg              = tcp_bpf_recvmsg;
        prot[TCP_BPF_BASE].sock_is_readable     = sk_msg_is_readable;
        prot[TCP_BPF_BASE].ioctl                = tcp_bpf_ioctl;

        prot[TCP_BPF_TX]                        = prot[TCP_BPF_BASE];
        prot[TCP_BPF_TX].sendmsg                = tcp_bpf_sendmsg;

        prot[TCP_BPF_RX]                        = prot[TCP_BPF_BASE];
        prot[TCP_BPF_RX].recvmsg                = tcp_bpf_recvmsg_parser;

        prot[TCP_BPF_TXRX]                      = prot[TCP_BPF_TX];
        prot[TCP_BPF_TXRX].recvmsg              = tcp_bpf_recvmsg_parser;
}

static void tcp_bpf_check_v6_needs_rebuild(struct proto *ops)
{
        if (unlikely(ops != smp_load_acquire(&tcpv6_prot_saved))) {
                spin_lock_bh(&tcpv6_prot_lock);
                if (likely(ops != tcpv6_prot_saved)) {
                        tcp_bpf_rebuild_protos(tcp_bpf_prots[TCP_BPF_IPV6], ops);
                        smp_store_release(&tcpv6_prot_saved, ops);
                }
                spin_unlock_bh(&tcpv6_prot_lock);
        }
}

static int __init tcp_bpf_v4_build_proto(void)
{
        tcp_bpf_rebuild_protos(tcp_bpf_prots[TCP_BPF_IPV4], &tcp_prot);
        return 0;
}
late_initcall(tcp_bpf_v4_build_proto);

static int tcp_bpf_assert_proto_ops(struct proto *ops)
{
        /* In order to avoid retpoline, we make assumptions when we call
         * into ops if e.g. a psock is not present. Make sure they are
         * indeed valid assumptions.
         */
        return ops->recvmsg  == tcp_recvmsg &&
               ops->sendmsg  == tcp_sendmsg ? 0 : -ENOTSUPP;
}

#if IS_ENABLED(CONFIG_BPF_STREAM_PARSER)
int tcp_bpf_strp_read_sock(struct strparser *strp, read_descriptor_t *desc,
                           sk_read_actor_t recv_actor)
{
        struct sock *sk = strp->sk;
        struct sk_psock *psock;
        struct tcp_sock *tp;
        int copied = 0;

        tp = tcp_sk(sk);
        rcu_read_lock();
        psock = sk_psock(sk);
        if (WARN_ON_ONCE(!psock)) {
                desc->error = -EINVAL;
                goto out;
        }

        psock->ingress_bytes = 0;
        copied = tcp_read_sock_noack(sk, desc, recv_actor, true,
                                     &psock->copied_seq);
        if (copied < 0)
                goto out;
        /* recv_actor may redirect skb to another socket (SK_REDIRECT) or
         * just put skb into ingress queue of current socket (SK_PASS).
         * For SK_REDIRECT, we need to ack the frame immediately but for
         * SK_PASS, we want to delay the ack until tcp_bpf_recvmsg_parser().
         */
        tp->copied_seq = psock->copied_seq - psock->ingress_bytes;
        tcp_rcv_space_adjust(sk);
        __tcp_cleanup_rbuf(sk, copied - psock->ingress_bytes);
out:
        rcu_read_unlock();
        return copied;
}
#endif /* CONFIG_BPF_STREAM_PARSER */

int tcp_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore)
{
        int family = sk->sk_family == AF_INET6 ? TCP_BPF_IPV6 : TCP_BPF_IPV4;
        int config = psock->progs.msg_parser   ? TCP_BPF_TX   : TCP_BPF_BASE;

        if (psock->progs.stream_verdict || psock->progs.skb_verdict) {
                config = (config == TCP_BPF_TX) ? TCP_BPF_TXRX : TCP_BPF_RX;
        }

        if (restore) {
                if (inet_csk_has_ulp(sk)) {
                        /* TLS does not have an unhash proto in SW cases,
                         * but we need to ensure we stop using the sock_map
                         * unhash routine because the associated psock is being
                         * removed. So use the original unhash handler.
                         */
                        WRITE_ONCE(sk->sk_prot->unhash, psock->saved_unhash);
                        tcp_update_ulp(sk, psock->sk_proto, psock->saved_write_space);
                } else {
                        WRITE_ONCE(sk->sk_write_space, psock->saved_write_space);
                        /* Pairs with lockless read in sk_clone_lock() */
                        sock_replace_proto(sk, psock->sk_proto);
                }
                return 0;
        }

        if (sk->sk_family == AF_INET6) {
                if (tcp_bpf_assert_proto_ops(psock->sk_proto))
                        return -EINVAL;

                tcp_bpf_check_v6_needs_rebuild(psock->sk_proto);
        }

        /* Pairs with lockless read in sk_clone_lock() */
        sock_replace_proto(sk, &tcp_bpf_prots[family][config]);
        return 0;
}
EXPORT_SYMBOL_GPL(tcp_bpf_update_proto);

/* If a child got cloned from a listening socket that had tcp_bpf
 * protocol callbacks installed, we need to restore the callbacks to
 * the default ones because the child does not inherit the psock state
 * that tcp_bpf callbacks expect.
 */
void tcp_bpf_clone(const struct sock *sk, struct sock *newsk)
{
        struct proto *prot = newsk->sk_prot;

        if (is_insidevar(prot, tcp_bpf_prots))
                newsk->sk_prot = sk->sk_prot_creator;
}
#endif /* CONFIG_BPF_SYSCALL */