mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
![Johannes Berg](/assets/img/avatar_default.png)
It seems like a historic accident that these return unsigned char *, and in many places that means casts are required, more often than not. Make these functions return void * and remove all the casts across the tree, adding a (u8 *) cast only where the unsigned char pointer was used directly, all done with the following spatch: @@ expression SKB, LEN; typedef u8; identifier fn = { skb_push, __skb_push, skb_push_rcsum }; @@ - *(fn(SKB, LEN)) + *(u8 *)fn(SKB, LEN) @@ expression E, SKB, LEN; identifier fn = { skb_push, __skb_push, skb_push_rcsum }; type T; @@ - E = ((T *)(fn(SKB, LEN))) + E = fn(SKB, LEN) @@ expression SKB, LEN; identifier fn = { skb_push, __skb_push, skb_push_rcsum }; @@ - fn(SKB, LEN)[0] + *(u8 *)fn(SKB, LEN) Note that the last part there converts from push(...)[0] to the more idiomatic *(u8 *)push(...). Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
432 lines
9.6 KiB
C
432 lines
9.6 KiB
C
/*
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* Copyright (C) 2011 Instituto Nokia de Tecnologia
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*
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* Authors:
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* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
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* Lauro Ramos Venancio <lauro.venancio@openbossa.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
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#include <net/tcp_states.h>
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#include <linux/nfc.h>
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#include <linux/export.h>
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#include "nfc.h"
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static struct nfc_sock_list raw_sk_list = {
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.lock = __RW_LOCK_UNLOCKED(raw_sk_list.lock)
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};
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static void nfc_sock_link(struct nfc_sock_list *l, struct sock *sk)
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{
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write_lock(&l->lock);
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sk_add_node(sk, &l->head);
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write_unlock(&l->lock);
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}
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static void nfc_sock_unlink(struct nfc_sock_list *l, struct sock *sk)
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{
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write_lock(&l->lock);
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sk_del_node_init(sk);
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write_unlock(&l->lock);
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}
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static void rawsock_write_queue_purge(struct sock *sk)
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{
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pr_debug("sk=%p\n", sk);
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spin_lock_bh(&sk->sk_write_queue.lock);
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__skb_queue_purge(&sk->sk_write_queue);
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nfc_rawsock(sk)->tx_work_scheduled = false;
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spin_unlock_bh(&sk->sk_write_queue.lock);
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}
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static void rawsock_report_error(struct sock *sk, int err)
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{
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pr_debug("sk=%p err=%d\n", sk, err);
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sk->sk_shutdown = SHUTDOWN_MASK;
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sk->sk_err = -err;
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sk->sk_error_report(sk);
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rawsock_write_queue_purge(sk);
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}
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static int rawsock_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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pr_debug("sock=%p sk=%p\n", sock, sk);
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if (!sk)
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return 0;
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if (sock->type == SOCK_RAW)
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nfc_sock_unlink(&raw_sk_list, sk);
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sock_orphan(sk);
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sock_put(sk);
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return 0;
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}
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static int rawsock_connect(struct socket *sock, struct sockaddr *_addr,
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int len, int flags)
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{
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struct sock *sk = sock->sk;
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struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr;
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struct nfc_dev *dev;
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int rc = 0;
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pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags);
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if (!addr || len < sizeof(struct sockaddr_nfc) ||
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addr->sa_family != AF_NFC)
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return -EINVAL;
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pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n",
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addr->dev_idx, addr->target_idx, addr->nfc_protocol);
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lock_sock(sk);
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if (sock->state == SS_CONNECTED) {
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rc = -EISCONN;
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goto error;
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}
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dev = nfc_get_device(addr->dev_idx);
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if (!dev) {
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rc = -ENODEV;
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goto error;
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}
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if (addr->target_idx > dev->target_next_idx - 1 ||
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addr->target_idx < dev->target_next_idx - dev->n_targets) {
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rc = -EINVAL;
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goto error;
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}
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rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
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if (rc)
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goto put_dev;
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nfc_rawsock(sk)->dev = dev;
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nfc_rawsock(sk)->target_idx = addr->target_idx;
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sock->state = SS_CONNECTED;
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sk->sk_state = TCP_ESTABLISHED;
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sk->sk_state_change(sk);
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release_sock(sk);
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return 0;
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put_dev:
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nfc_put_device(dev);
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error:
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release_sock(sk);
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return rc;
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}
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static int rawsock_add_header(struct sk_buff *skb)
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{
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*(u8 *)skb_push(skb, NFC_HEADER_SIZE) = 0;
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return 0;
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}
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static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb,
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int err)
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{
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struct sock *sk = (struct sock *) context;
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BUG_ON(in_irq());
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pr_debug("sk=%p err=%d\n", sk, err);
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if (err)
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goto error;
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err = rawsock_add_header(skb);
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if (err)
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goto error_skb;
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err = sock_queue_rcv_skb(sk, skb);
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if (err)
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goto error_skb;
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spin_lock_bh(&sk->sk_write_queue.lock);
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if (!skb_queue_empty(&sk->sk_write_queue))
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schedule_work(&nfc_rawsock(sk)->tx_work);
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else
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nfc_rawsock(sk)->tx_work_scheduled = false;
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spin_unlock_bh(&sk->sk_write_queue.lock);
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sock_put(sk);
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return;
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error_skb:
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kfree_skb(skb);
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error:
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rawsock_report_error(sk, err);
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sock_put(sk);
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}
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static void rawsock_tx_work(struct work_struct *work)
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{
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struct sock *sk = to_rawsock_sk(work);
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struct nfc_dev *dev = nfc_rawsock(sk)->dev;
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u32 target_idx = nfc_rawsock(sk)->target_idx;
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struct sk_buff *skb;
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int rc;
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pr_debug("sk=%p target_idx=%u\n", sk, target_idx);
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if (sk->sk_shutdown & SEND_SHUTDOWN) {
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rawsock_write_queue_purge(sk);
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return;
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}
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skb = skb_dequeue(&sk->sk_write_queue);
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sock_hold(sk);
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rc = nfc_data_exchange(dev, target_idx, skb,
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rawsock_data_exchange_complete, sk);
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if (rc) {
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rawsock_report_error(sk, rc);
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sock_put(sk);
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}
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}
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static int rawsock_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
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{
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struct sock *sk = sock->sk;
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struct nfc_dev *dev = nfc_rawsock(sk)->dev;
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struct sk_buff *skb;
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int rc;
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pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len);
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if (msg->msg_namelen)
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return -EOPNOTSUPP;
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if (sock->state != SS_CONNECTED)
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return -ENOTCONN;
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skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc);
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if (skb == NULL)
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return rc;
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rc = memcpy_from_msg(skb_put(skb, len), msg, len);
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if (rc < 0) {
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kfree_skb(skb);
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return rc;
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}
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spin_lock_bh(&sk->sk_write_queue.lock);
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__skb_queue_tail(&sk->sk_write_queue, skb);
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if (!nfc_rawsock(sk)->tx_work_scheduled) {
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schedule_work(&nfc_rawsock(sk)->tx_work);
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nfc_rawsock(sk)->tx_work_scheduled = true;
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}
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spin_unlock_bh(&sk->sk_write_queue.lock);
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return len;
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}
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static int rawsock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
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int flags)
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{
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int noblock = flags & MSG_DONTWAIT;
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struct sock *sk = sock->sk;
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struct sk_buff *skb;
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int copied;
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int rc;
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pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags);
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skb = skb_recv_datagram(sk, flags, noblock, &rc);
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if (!skb)
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return rc;
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copied = skb->len;
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if (len < copied) {
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msg->msg_flags |= MSG_TRUNC;
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copied = len;
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}
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rc = skb_copy_datagram_msg(skb, 0, msg, copied);
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skb_free_datagram(sk, skb);
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return rc ? : copied;
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}
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static const struct proto_ops rawsock_ops = {
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.family = PF_NFC,
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.owner = THIS_MODULE,
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.release = rawsock_release,
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.bind = sock_no_bind,
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.connect = rawsock_connect,
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.socketpair = sock_no_socketpair,
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.accept = sock_no_accept,
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.getname = sock_no_getname,
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.poll = datagram_poll,
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.ioctl = sock_no_ioctl,
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.listen = sock_no_listen,
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.shutdown = sock_no_shutdown,
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.setsockopt = sock_no_setsockopt,
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.getsockopt = sock_no_getsockopt,
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.sendmsg = rawsock_sendmsg,
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.recvmsg = rawsock_recvmsg,
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.mmap = sock_no_mmap,
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};
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static const struct proto_ops rawsock_raw_ops = {
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.family = PF_NFC,
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.owner = THIS_MODULE,
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.release = rawsock_release,
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.bind = sock_no_bind,
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.connect = sock_no_connect,
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.socketpair = sock_no_socketpair,
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.accept = sock_no_accept,
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.getname = sock_no_getname,
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.poll = datagram_poll,
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.ioctl = sock_no_ioctl,
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.listen = sock_no_listen,
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.shutdown = sock_no_shutdown,
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.setsockopt = sock_no_setsockopt,
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.getsockopt = sock_no_getsockopt,
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.sendmsg = sock_no_sendmsg,
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.recvmsg = rawsock_recvmsg,
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.mmap = sock_no_mmap,
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};
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static void rawsock_destruct(struct sock *sk)
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{
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pr_debug("sk=%p\n", sk);
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if (sk->sk_state == TCP_ESTABLISHED) {
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nfc_deactivate_target(nfc_rawsock(sk)->dev,
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nfc_rawsock(sk)->target_idx,
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NFC_TARGET_MODE_IDLE);
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nfc_put_device(nfc_rawsock(sk)->dev);
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}
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skb_queue_purge(&sk->sk_receive_queue);
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if (!sock_flag(sk, SOCK_DEAD)) {
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pr_err("Freeing alive NFC raw socket %p\n", sk);
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return;
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}
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}
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static int rawsock_create(struct net *net, struct socket *sock,
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const struct nfc_protocol *nfc_proto, int kern)
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{
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struct sock *sk;
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pr_debug("sock=%p\n", sock);
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if ((sock->type != SOCK_SEQPACKET) && (sock->type != SOCK_RAW))
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return -ESOCKTNOSUPPORT;
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if (sock->type == SOCK_RAW)
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sock->ops = &rawsock_raw_ops;
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else
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sock->ops = &rawsock_ops;
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sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto, kern);
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if (!sk)
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return -ENOMEM;
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sock_init_data(sock, sk);
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sk->sk_protocol = nfc_proto->id;
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sk->sk_destruct = rawsock_destruct;
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sock->state = SS_UNCONNECTED;
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if (sock->type == SOCK_RAW)
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nfc_sock_link(&raw_sk_list, sk);
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else {
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INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
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nfc_rawsock(sk)->tx_work_scheduled = false;
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}
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return 0;
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}
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void nfc_send_to_raw_sock(struct nfc_dev *dev, struct sk_buff *skb,
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u8 payload_type, u8 direction)
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{
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struct sk_buff *skb_copy = NULL, *nskb;
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struct sock *sk;
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u8 *data;
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read_lock(&raw_sk_list.lock);
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sk_for_each(sk, &raw_sk_list.head) {
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if (!skb_copy) {
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skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
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GFP_ATOMIC, true);
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if (!skb_copy)
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continue;
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data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
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data[0] = dev ? dev->idx : 0xFF;
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data[1] = direction & 0x01;
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data[1] |= (payload_type << 1);
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}
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nskb = skb_clone(skb_copy, GFP_ATOMIC);
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if (!nskb)
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continue;
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if (sock_queue_rcv_skb(sk, nskb))
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kfree_skb(nskb);
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}
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read_unlock(&raw_sk_list.lock);
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kfree_skb(skb_copy);
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}
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EXPORT_SYMBOL(nfc_send_to_raw_sock);
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static struct proto rawsock_proto = {
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.name = "NFC_RAW",
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.owner = THIS_MODULE,
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.obj_size = sizeof(struct nfc_rawsock),
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};
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static const struct nfc_protocol rawsock_nfc_proto = {
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.id = NFC_SOCKPROTO_RAW,
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.proto = &rawsock_proto,
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.owner = THIS_MODULE,
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.create = rawsock_create
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};
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int __init rawsock_init(void)
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{
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int rc;
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rc = nfc_proto_register(&rawsock_nfc_proto);
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return rc;
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}
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void rawsock_exit(void)
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{
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nfc_proto_unregister(&rawsock_nfc_proto);
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}
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