704 lines
15 KiB
C
704 lines
15 KiB
C
/*
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* Copyright (C) 2011 Intel Corporation. All rights reserved.
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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, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#define pr_fmt(fmt) "llcp: %s: " fmt, __func__
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/nfc.h>
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#include "../nfc.h"
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#include "llcp.h"
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static struct proto llcp_sock_proto = {
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.name = "NFC_LLCP",
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.owner = THIS_MODULE,
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.obj_size = sizeof(struct nfc_llcp_sock),
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};
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static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
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{
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struct sock *sk = sock->sk;
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struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
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struct nfc_llcp_local *local;
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struct nfc_dev *dev;
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struct sockaddr_nfc_llcp llcp_addr;
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int len, ret = 0;
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pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
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if (!addr || addr->sa_family != AF_NFC)
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return -EINVAL;
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memset(&llcp_addr, 0, sizeof(llcp_addr));
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len = min_t(unsigned int, sizeof(llcp_addr), alen);
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memcpy(&llcp_addr, addr, len);
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/* This is going to be a listening socket, dsap must be 0 */
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if (llcp_addr.dsap != 0)
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return -EINVAL;
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lock_sock(sk);
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if (sk->sk_state != LLCP_CLOSED) {
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ret = -EBADFD;
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goto error;
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}
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dev = nfc_get_device(llcp_addr.dev_idx);
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if (dev == NULL) {
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ret = -ENODEV;
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goto error;
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}
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local = nfc_llcp_find_local(dev);
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if (local == NULL) {
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ret = -ENODEV;
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goto put_dev;
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}
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llcp_sock->dev = dev;
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llcp_sock->local = local;
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llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
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llcp_sock->service_name_len = min_t(unsigned int,
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llcp_addr.service_name_len,
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NFC_LLCP_MAX_SERVICE_NAME);
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llcp_sock->service_name = kmemdup(llcp_addr.service_name,
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llcp_sock->service_name_len,
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GFP_KERNEL);
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llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
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if (llcp_sock->ssap == LLCP_MAX_SAP)
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goto put_dev;
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local->sockets[llcp_sock->ssap] = llcp_sock;
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pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
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sk->sk_state = LLCP_BOUND;
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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 ret;
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}
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static int llcp_sock_listen(struct socket *sock, int backlog)
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{
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struct sock *sk = sock->sk;
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int ret = 0;
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pr_debug("sk %p backlog %d\n", sk, backlog);
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lock_sock(sk);
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if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
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|| sk->sk_state != LLCP_BOUND) {
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ret = -EBADFD;
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goto error;
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}
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sk->sk_max_ack_backlog = backlog;
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sk->sk_ack_backlog = 0;
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pr_debug("Socket listening\n");
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sk->sk_state = LLCP_LISTEN;
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error:
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release_sock(sk);
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return ret;
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}
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void nfc_llcp_accept_unlink(struct sock *sk)
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{
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struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
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pr_debug("state %d\n", sk->sk_state);
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list_del_init(&llcp_sock->accept_queue);
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sk_acceptq_removed(llcp_sock->parent);
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llcp_sock->parent = NULL;
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sock_put(sk);
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}
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void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
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{
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struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
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struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
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/* Lock will be free from unlink */
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sock_hold(sk);
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list_add_tail(&llcp_sock->accept_queue,
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&llcp_sock_parent->accept_queue);
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llcp_sock->parent = parent;
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sk_acceptq_added(parent);
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}
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struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
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struct socket *newsock)
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{
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struct nfc_llcp_sock *lsk, *n, *llcp_parent;
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struct sock *sk;
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llcp_parent = nfc_llcp_sock(parent);
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list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
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accept_queue) {
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sk = &lsk->sk;
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lock_sock(sk);
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if (sk->sk_state == LLCP_CLOSED) {
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release_sock(sk);
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nfc_llcp_accept_unlink(sk);
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continue;
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}
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if (sk->sk_state == LLCP_CONNECTED || !newsock) {
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nfc_llcp_accept_unlink(sk);
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if (newsock)
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sock_graft(sk, newsock);
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release_sock(sk);
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pr_debug("Returning sk state %d\n", sk->sk_state);
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return sk;
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}
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release_sock(sk);
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}
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return NULL;
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}
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static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
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int flags)
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{
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DECLARE_WAITQUEUE(wait, current);
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struct sock *sk = sock->sk, *new_sk;
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long timeo;
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int ret = 0;
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pr_debug("parent %p\n", sk);
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lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
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if (sk->sk_state != LLCP_LISTEN) {
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ret = -EBADFD;
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goto error;
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}
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timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
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/* Wait for an incoming connection. */
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add_wait_queue_exclusive(sk_sleep(sk), &wait);
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while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
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set_current_state(TASK_INTERRUPTIBLE);
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if (!timeo) {
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ret = -EAGAIN;
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break;
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}
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if (signal_pending(current)) {
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ret = sock_intr_errno(timeo);
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break;
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}
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release_sock(sk);
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timeo = schedule_timeout(timeo);
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lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
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}
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__set_current_state(TASK_RUNNING);
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remove_wait_queue(sk_sleep(sk), &wait);
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if (ret)
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goto error;
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newsock->state = SS_CONNECTED;
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pr_debug("new socket %p\n", new_sk);
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error:
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release_sock(sk);
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return ret;
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}
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static int llcp_sock_getname(struct socket *sock, struct sockaddr *addr,
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int *len, int peer)
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{
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struct sockaddr_nfc_llcp *llcp_addr = (struct sockaddr_nfc_llcp *)addr;
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struct sock *sk = sock->sk;
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struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
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pr_debug("%p\n", sk);
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addr->sa_family = AF_NFC;
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*len = sizeof(struct sockaddr_nfc_llcp);
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llcp_addr->dev_idx = llcp_sock->dev->idx;
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llcp_addr->dsap = llcp_sock->dsap;
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llcp_addr->ssap = llcp_sock->ssap;
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llcp_addr->service_name_len = llcp_sock->service_name_len;
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memcpy(llcp_addr->service_name, llcp_sock->service_name,
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llcp_addr->service_name_len);
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return 0;
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}
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static inline unsigned int llcp_accept_poll(struct sock *parent)
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{
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struct nfc_llcp_sock *llcp_sock, *n, *parent_sock;
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struct sock *sk;
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parent_sock = nfc_llcp_sock(parent);
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list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
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accept_queue) {
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sk = &llcp_sock->sk;
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if (sk->sk_state == LLCP_CONNECTED)
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return POLLIN | POLLRDNORM;
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}
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return 0;
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}
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static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
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poll_table *wait)
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{
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struct sock *sk = sock->sk;
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unsigned int mask = 0;
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pr_debug("%p\n", sk);
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sock_poll_wait(file, sk_sleep(sk), wait);
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if (sk->sk_state == LLCP_LISTEN)
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return llcp_accept_poll(sk);
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if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
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mask |= POLLERR;
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if (!skb_queue_empty(&sk->sk_receive_queue))
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mask |= POLLIN;
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if (sk->sk_state == LLCP_CLOSED)
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mask |= POLLHUP;
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return mask;
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}
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static int llcp_sock_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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struct nfc_llcp_local *local;
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struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
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int err = 0;
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if (!sk)
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return 0;
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pr_debug("%p\n", sk);
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local = llcp_sock->local;
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if (local == NULL) {
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err = -ENODEV;
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goto out;
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}
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mutex_lock(&local->socket_lock);
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if (llcp_sock == local->sockets[llcp_sock->ssap])
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local->sockets[llcp_sock->ssap] = NULL;
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else
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list_del_init(&llcp_sock->list);
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mutex_unlock(&local->socket_lock);
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lock_sock(sk);
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/* Send a DISC */
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if (sk->sk_state == LLCP_CONNECTED)
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nfc_llcp_disconnect(llcp_sock);
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if (sk->sk_state == LLCP_LISTEN) {
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struct nfc_llcp_sock *lsk, *n;
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struct sock *accept_sk;
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list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
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accept_queue) {
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accept_sk = &lsk->sk;
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lock_sock(accept_sk);
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nfc_llcp_disconnect(lsk);
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nfc_llcp_accept_unlink(accept_sk);
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release_sock(accept_sk);
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sock_orphan(accept_sk);
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}
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}
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/* Freeing the SAP */
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if ((sk->sk_state == LLCP_CONNECTED
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&& llcp_sock->ssap > LLCP_LOCAL_SAP_OFFSET) ||
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sk->sk_state == LLCP_BOUND || sk->sk_state == LLCP_LISTEN)
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nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
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release_sock(sk);
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out:
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sock_orphan(sk);
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sock_put(sk);
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return err;
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}
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static int llcp_sock_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 nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
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struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
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struct nfc_dev *dev;
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struct nfc_llcp_local *local;
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int ret = 0;
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pr_debug("sock %p sk %p flags 0x%x\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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pr_err("Invalid socket\n");
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return -EINVAL;
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}
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if (addr->service_name_len == 0 && addr->dsap == 0) {
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pr_err("Missing service name or dsap\n");
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return -EINVAL;
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}
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pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
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addr->target_idx, addr->nfc_protocol);
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lock_sock(sk);
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if (sk->sk_state == LLCP_CONNECTED) {
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ret = -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 == NULL) {
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ret = -ENODEV;
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goto error;
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}
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local = nfc_llcp_find_local(dev);
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if (local == NULL) {
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ret = -ENODEV;
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goto put_dev;
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}
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device_lock(&dev->dev);
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if (dev->dep_link_up == false) {
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ret = -ENOLINK;
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device_unlock(&dev->dev);
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goto put_dev;
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}
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device_unlock(&dev->dev);
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if (local->rf_mode == NFC_RF_INITIATOR &&
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addr->target_idx != local->target_idx) {
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ret = -ENOLINK;
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goto put_dev;
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}
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llcp_sock->dev = dev;
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llcp_sock->local = local;
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llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
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if (llcp_sock->ssap == LLCP_SAP_MAX) {
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ret = -ENOMEM;
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goto put_dev;
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}
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if (addr->service_name_len == 0)
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llcp_sock->dsap = addr->dsap;
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else
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llcp_sock->dsap = LLCP_SAP_SDP;
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llcp_sock->nfc_protocol = addr->nfc_protocol;
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llcp_sock->service_name_len = min_t(unsigned int,
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addr->service_name_len,
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NFC_LLCP_MAX_SERVICE_NAME);
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llcp_sock->service_name = kmemdup(addr->service_name,
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llcp_sock->service_name_len,
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GFP_KERNEL);
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local->sockets[llcp_sock->ssap] = llcp_sock;
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ret = nfc_llcp_send_connect(llcp_sock);
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if (ret)
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goto put_dev;
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sk->sk_state = LLCP_CONNECTED;
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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 ret;
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}
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static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
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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_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
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int ret;
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pr_debug("sock %p sk %p", sock, sk);
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ret = sock_error(sk);
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if (ret)
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return ret;
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if (msg->msg_flags & MSG_OOB)
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return -EOPNOTSUPP;
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lock_sock(sk);
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if (sk->sk_state != LLCP_CONNECTED) {
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release_sock(sk);
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return -ENOTCONN;
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}
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release_sock(sk);
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return nfc_llcp_send_i_frame(llcp_sock, msg, len);
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}
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static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
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struct msghdr *msg, size_t len, 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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unsigned int copied, rlen;
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struct sk_buff *skb, *cskb;
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int err = 0;
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pr_debug("%p %zu\n", sk, len);
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lock_sock(sk);
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if (sk->sk_state == LLCP_CLOSED &&
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skb_queue_empty(&sk->sk_receive_queue)) {
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release_sock(sk);
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return 0;
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}
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release_sock(sk);
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if (flags & (MSG_OOB))
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return -EOPNOTSUPP;
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skb = skb_recv_datagram(sk, flags, noblock, &err);
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if (!skb) {
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pr_err("Recv datagram failed state %d %d %d",
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sk->sk_state, err, sock_error(sk));
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if (sk->sk_shutdown & RCV_SHUTDOWN)
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return 0;
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return err;
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}
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rlen = skb->len; /* real length of skb */
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copied = min_t(unsigned int, rlen, len);
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cskb = skb;
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if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
|
|
if (!(flags & MSG_PEEK))
|
|
skb_queue_head(&sk->sk_receive_queue, skb);
|
|
return -EFAULT;
|
|
}
|
|
|
|
/* Mark read part of skb as used */
|
|
if (!(flags & MSG_PEEK)) {
|
|
|
|
/* SOCK_STREAM: re-queue skb if it contains unreceived data */
|
|
if (sk->sk_type == SOCK_STREAM) {
|
|
skb_pull(skb, copied);
|
|
if (skb->len) {
|
|
skb_queue_head(&sk->sk_receive_queue, skb);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
/* XXX Queue backlogged skbs */
|
|
|
|
done:
|
|
/* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
|
|
if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
|
|
copied = rlen;
|
|
|
|
return copied;
|
|
}
|
|
|
|
static const struct proto_ops llcp_sock_ops = {
|
|
.family = PF_NFC,
|
|
.owner = THIS_MODULE,
|
|
.bind = llcp_sock_bind,
|
|
.connect = llcp_sock_connect,
|
|
.release = llcp_sock_release,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = llcp_sock_accept,
|
|
.getname = llcp_sock_getname,
|
|
.poll = llcp_sock_poll,
|
|
.ioctl = sock_no_ioctl,
|
|
.listen = llcp_sock_listen,
|
|
.shutdown = sock_no_shutdown,
|
|
.setsockopt = sock_no_setsockopt,
|
|
.getsockopt = sock_no_getsockopt,
|
|
.sendmsg = llcp_sock_sendmsg,
|
|
.recvmsg = llcp_sock_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
};
|
|
|
|
static void llcp_sock_destruct(struct sock *sk)
|
|
{
|
|
struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
|
|
|
|
pr_debug("%p\n", sk);
|
|
|
|
if (sk->sk_state == LLCP_CONNECTED)
|
|
nfc_put_device(llcp_sock->dev);
|
|
|
|
skb_queue_purge(&sk->sk_receive_queue);
|
|
|
|
nfc_llcp_sock_free(llcp_sock);
|
|
|
|
if (!sock_flag(sk, SOCK_DEAD)) {
|
|
pr_err("Freeing alive NFC LLCP socket %p\n", sk);
|
|
return;
|
|
}
|
|
}
|
|
|
|
struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
|
|
{
|
|
struct sock *sk;
|
|
struct nfc_llcp_sock *llcp_sock;
|
|
|
|
sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
|
|
if (!sk)
|
|
return NULL;
|
|
|
|
llcp_sock = nfc_llcp_sock(sk);
|
|
|
|
sock_init_data(sock, sk);
|
|
sk->sk_state = LLCP_CLOSED;
|
|
sk->sk_protocol = NFC_SOCKPROTO_LLCP;
|
|
sk->sk_type = type;
|
|
sk->sk_destruct = llcp_sock_destruct;
|
|
|
|
llcp_sock->ssap = 0;
|
|
llcp_sock->dsap = LLCP_SAP_SDP;
|
|
llcp_sock->send_n = llcp_sock->send_ack_n = 0;
|
|
llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
|
|
llcp_sock->remote_ready = 1;
|
|
skb_queue_head_init(&llcp_sock->tx_queue);
|
|
skb_queue_head_init(&llcp_sock->tx_pending_queue);
|
|
skb_queue_head_init(&llcp_sock->tx_backlog_queue);
|
|
INIT_LIST_HEAD(&llcp_sock->list);
|
|
INIT_LIST_HEAD(&llcp_sock->accept_queue);
|
|
|
|
if (sock != NULL)
|
|
sock->state = SS_UNCONNECTED;
|
|
|
|
return sk;
|
|
}
|
|
|
|
void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
|
|
{
|
|
struct nfc_llcp_local *local = sock->local;
|
|
|
|
kfree(sock->service_name);
|
|
|
|
skb_queue_purge(&sock->tx_queue);
|
|
skb_queue_purge(&sock->tx_pending_queue);
|
|
skb_queue_purge(&sock->tx_backlog_queue);
|
|
|
|
list_del_init(&sock->accept_queue);
|
|
|
|
if (local != NULL && sock == local->sockets[sock->ssap])
|
|
local->sockets[sock->ssap] = NULL;
|
|
else
|
|
list_del_init(&sock->list);
|
|
|
|
sock->parent = NULL;
|
|
}
|
|
|
|
static int llcp_sock_create(struct net *net, struct socket *sock,
|
|
const struct nfc_protocol *nfc_proto)
|
|
{
|
|
struct sock *sk;
|
|
|
|
pr_debug("%p\n", sock);
|
|
|
|
if (sock->type != SOCK_STREAM && sock->type != SOCK_DGRAM)
|
|
return -ESOCKTNOSUPPORT;
|
|
|
|
sock->ops = &llcp_sock_ops;
|
|
|
|
sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
|
|
if (sk == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct nfc_protocol llcp_nfc_proto = {
|
|
.id = NFC_SOCKPROTO_LLCP,
|
|
.proto = &llcp_sock_proto,
|
|
.owner = THIS_MODULE,
|
|
.create = llcp_sock_create
|
|
};
|
|
|
|
int __init nfc_llcp_sock_init(void)
|
|
{
|
|
return nfc_proto_register(&llcp_nfc_proto);
|
|
}
|
|
|
|
void nfc_llcp_sock_exit(void)
|
|
{
|
|
nfc_proto_unregister(&llcp_nfc_proto);
|
|
}
|