1041 lines
22 KiB
C
1041 lines
22 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, see <http://www.gnu.org/licenses/>.
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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 int sock_wait_state(struct sock *sk, int state, unsigned long timeo)
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{
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DECLARE_WAITQUEUE(wait, current);
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int err = 0;
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pr_debug("sk %p", sk);
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add_wait_queue(sk_sleep(sk), &wait);
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set_current_state(TASK_INTERRUPTIBLE);
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while (sk->sk_state != state) {
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if (!timeo) {
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err = -EINPROGRESS;
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break;
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}
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if (signal_pending(current)) {
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err = 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(sk);
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set_current_state(TASK_INTERRUPTIBLE);
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err = sock_error(sk);
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if (err)
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break;
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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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return err;
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}
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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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if (!addr || addr->sa_family != AF_NFC)
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return -EINVAL;
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pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
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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 = nfc_llcp_local_get(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_SAP_MAX) {
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ret = -EADDRINUSE;
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goto put_dev;
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}
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llcp_sock->reserved_ssap = llcp_sock->ssap;
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nfc_llcp_sock_link(&local->sockets, sk);
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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_raw_sock_bind(struct socket *sock, struct sockaddr *addr,
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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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if (!addr || addr->sa_family != AF_NFC)
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return -EINVAL;
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pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
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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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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 = nfc_llcp_local_get(local);
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llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
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nfc_llcp_sock_link(&local->raw_sockets, sk);
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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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static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
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char __user *optval, unsigned int optlen)
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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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u32 opt;
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int err = 0;
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pr_debug("%p optname %d\n", sk, optname);
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if (level != SOL_NFC)
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return -ENOPROTOOPT;
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lock_sock(sk);
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switch (optname) {
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case NFC_LLCP_RW:
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if (sk->sk_state == LLCP_CONNECTED ||
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sk->sk_state == LLCP_BOUND ||
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sk->sk_state == LLCP_LISTEN) {
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err = -EINVAL;
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break;
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}
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if (get_user(opt, (u32 __user *) optval)) {
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err = -EFAULT;
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break;
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}
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if (opt > LLCP_MAX_RW) {
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err = -EINVAL;
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break;
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}
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llcp_sock->rw = (u8) opt;
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break;
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case NFC_LLCP_MIUX:
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if (sk->sk_state == LLCP_CONNECTED ||
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sk->sk_state == LLCP_BOUND ||
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sk->sk_state == LLCP_LISTEN) {
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err = -EINVAL;
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break;
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}
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if (get_user(opt, (u32 __user *) optval)) {
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err = -EFAULT;
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break;
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}
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if (opt > LLCP_MAX_MIUX) {
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err = -EINVAL;
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break;
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}
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llcp_sock->miux = cpu_to_be16((u16) opt);
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break;
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default:
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err = -ENOPROTOOPT;
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break;
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}
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release_sock(sk);
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pr_debug("%p rw %d miux %d\n", llcp_sock,
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llcp_sock->rw, llcp_sock->miux);
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return err;
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}
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static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
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char __user *optval, int __user *optlen)
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{
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struct nfc_llcp_local *local;
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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 len, err = 0;
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u16 miux, remote_miu;
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u8 rw;
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pr_debug("%p optname %d\n", sk, optname);
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if (level != SOL_NFC)
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return -ENOPROTOOPT;
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if (get_user(len, optlen))
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return -EFAULT;
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local = llcp_sock->local;
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if (!local)
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return -ENODEV;
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len = min_t(u32, len, sizeof(u32));
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lock_sock(sk);
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switch (optname) {
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case NFC_LLCP_RW:
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rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;
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if (put_user(rw, (u32 __user *) optval))
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err = -EFAULT;
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break;
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case NFC_LLCP_MIUX:
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miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ?
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be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux);
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if (put_user(miux, (u32 __user *) optval))
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err = -EFAULT;
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break;
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case NFC_LLCP_REMOTE_MIU:
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remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ?
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local->remote_miu : llcp_sock->remote_miu;
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if (put_user(remote_miu, (u32 __user *) optval))
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err = -EFAULT;
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break;
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case NFC_LLCP_REMOTE_LTO:
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if (put_user(local->remote_lto / 10, (u32 __user *) optval))
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err = -EFAULT;
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break;
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case NFC_LLCP_REMOTE_RW:
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if (put_user(llcp_sock->remote_rw, (u32 __user *) optval))
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err = -EFAULT;
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break;
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default:
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err = -ENOPROTOOPT;
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break;
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}
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release_sock(sk);
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if (put_user(len, optlen))
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return -EFAULT;
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return err;
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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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list_del_init(&lsk->accept_queue);
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sock_put(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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sk_acceptq_removed(parent);
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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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|
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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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|
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timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
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|
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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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|
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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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|
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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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|
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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);
|
|
remove_wait_queue(sk_sleep(sk), &wait);
|
|
|
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if (ret)
|
|
goto error;
|
|
|
|
newsock->state = SS_CONNECTED;
|
|
|
|
pr_debug("new socket %p\n", new_sk);
|
|
|
|
error:
|
|
release_sock(sk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
|
|
int *len, int peer)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
|
|
DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
|
|
|
|
if (llcp_sock == NULL || llcp_sock->dev == NULL)
|
|
return -EBADFD;
|
|
|
|
pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
|
|
llcp_sock->dsap, llcp_sock->ssap);
|
|
|
|
memset(llcp_addr, 0, sizeof(*llcp_addr));
|
|
*len = sizeof(struct sockaddr_nfc_llcp);
|
|
|
|
lock_sock(sk);
|
|
if (!llcp_sock->dev) {
|
|
release_sock(sk);
|
|
return -EBADFD;
|
|
}
|
|
llcp_addr->sa_family = AF_NFC;
|
|
llcp_addr->dev_idx = llcp_sock->dev->idx;
|
|
llcp_addr->target_idx = llcp_sock->target_idx;
|
|
llcp_addr->nfc_protocol = llcp_sock->nfc_protocol;
|
|
llcp_addr->dsap = llcp_sock->dsap;
|
|
llcp_addr->ssap = llcp_sock->ssap;
|
|
llcp_addr->service_name_len = llcp_sock->service_name_len;
|
|
memcpy(llcp_addr->service_name, llcp_sock->service_name,
|
|
llcp_addr->service_name_len);
|
|
release_sock(sk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned int llcp_accept_poll(struct sock *parent)
|
|
{
|
|
struct nfc_llcp_sock *llcp_sock, *parent_sock;
|
|
struct sock *sk;
|
|
|
|
parent_sock = nfc_llcp_sock(parent);
|
|
|
|
list_for_each_entry(llcp_sock, &parent_sock->accept_queue,
|
|
accept_queue) {
|
|
sk = &llcp_sock->sk;
|
|
|
|
if (sk->sk_state == LLCP_CONNECTED)
|
|
return POLLIN | POLLRDNORM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
|
|
poll_table *wait)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
unsigned int mask = 0;
|
|
|
|
pr_debug("%p\n", sk);
|
|
|
|
sock_poll_wait(file, sk_sleep(sk), wait);
|
|
|
|
if (sk->sk_state == LLCP_LISTEN)
|
|
return llcp_accept_poll(sk);
|
|
|
|
if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
|
|
mask |= POLLERR |
|
|
(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
|
|
|
|
if (!skb_queue_empty(&sk->sk_receive_queue))
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
if (sk->sk_state == LLCP_CLOSED)
|
|
mask |= POLLHUP;
|
|
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
|
mask |= POLLRDHUP | POLLIN | POLLRDNORM;
|
|
|
|
if (sk->sk_shutdown == SHUTDOWN_MASK)
|
|
mask |= POLLHUP;
|
|
|
|
if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED)
|
|
mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
|
|
else
|
|
sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
|
|
|
|
pr_debug("mask 0x%x\n", mask);
|
|
|
|
return mask;
|
|
}
|
|
|
|
static int llcp_sock_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct nfc_llcp_local *local;
|
|
struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
|
|
int err = 0;
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
pr_debug("%p\n", sk);
|
|
|
|
local = llcp_sock->local;
|
|
if (local == NULL) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
lock_sock(sk);
|
|
|
|
/* Send a DISC */
|
|
if (sk->sk_state == LLCP_CONNECTED)
|
|
nfc_llcp_send_disconnect(llcp_sock);
|
|
|
|
if (sk->sk_state == LLCP_LISTEN) {
|
|
struct nfc_llcp_sock *lsk, *n;
|
|
struct sock *accept_sk;
|
|
|
|
list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
|
|
accept_queue) {
|
|
accept_sk = &lsk->sk;
|
|
lock_sock(accept_sk);
|
|
|
|
nfc_llcp_send_disconnect(lsk);
|
|
nfc_llcp_accept_unlink(accept_sk);
|
|
|
|
release_sock(accept_sk);
|
|
}
|
|
}
|
|
|
|
if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
|
|
nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
|
|
|
|
release_sock(sk);
|
|
|
|
/* Keep this sock alive and therefore do not remove it from the sockets
|
|
* list until the DISC PDU has been actually sent. Otherwise we would
|
|
* reply with DM PDUs before sending the DISC one.
|
|
*/
|
|
if (sk->sk_state == LLCP_DISCONNECTING)
|
|
return err;
|
|
|
|
if (sock->type == SOCK_RAW)
|
|
nfc_llcp_sock_unlink(&local->raw_sockets, sk);
|
|
else
|
|
nfc_llcp_sock_unlink(&local->sockets, sk);
|
|
|
|
out:
|
|
sock_orphan(sk);
|
|
sock_put(sk);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
|
|
int len, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
|
|
struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
|
|
struct nfc_dev *dev;
|
|
struct nfc_llcp_local *local;
|
|
int ret = 0;
|
|
|
|
pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
|
|
|
|
if (!addr || len < sizeof(struct sockaddr_nfc) ||
|
|
addr->sa_family != AF_NFC)
|
|
return -EINVAL;
|
|
|
|
if (addr->service_name_len == 0 && addr->dsap == 0)
|
|
return -EINVAL;
|
|
|
|
pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
|
|
addr->target_idx, addr->nfc_protocol);
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_state == LLCP_CONNECTED) {
|
|
ret = -EISCONN;
|
|
goto error;
|
|
}
|
|
|
|
dev = nfc_get_device(addr->dev_idx);
|
|
if (dev == NULL) {
|
|
ret = -ENODEV;
|
|
goto error;
|
|
}
|
|
|
|
local = nfc_llcp_find_local(dev);
|
|
if (local == NULL) {
|
|
ret = -ENODEV;
|
|
goto put_dev;
|
|
}
|
|
|
|
device_lock(&dev->dev);
|
|
if (dev->dep_link_up == false) {
|
|
ret = -ENOLINK;
|
|
device_unlock(&dev->dev);
|
|
goto put_dev;
|
|
}
|
|
device_unlock(&dev->dev);
|
|
|
|
if (local->rf_mode == NFC_RF_INITIATOR &&
|
|
addr->target_idx != local->target_idx) {
|
|
ret = -ENOLINK;
|
|
goto put_dev;
|
|
}
|
|
|
|
llcp_sock->dev = dev;
|
|
llcp_sock->local = nfc_llcp_local_get(local);
|
|
llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
|
|
if (llcp_sock->ssap == LLCP_SAP_MAX) {
|
|
ret = -ENOMEM;
|
|
goto put_dev;
|
|
}
|
|
|
|
llcp_sock->reserved_ssap = llcp_sock->ssap;
|
|
|
|
if (addr->service_name_len == 0)
|
|
llcp_sock->dsap = addr->dsap;
|
|
else
|
|
llcp_sock->dsap = LLCP_SAP_SDP;
|
|
llcp_sock->nfc_protocol = addr->nfc_protocol;
|
|
llcp_sock->service_name_len = min_t(unsigned int,
|
|
addr->service_name_len,
|
|
NFC_LLCP_MAX_SERVICE_NAME);
|
|
llcp_sock->service_name = kmemdup(addr->service_name,
|
|
llcp_sock->service_name_len,
|
|
GFP_KERNEL);
|
|
|
|
nfc_llcp_sock_link(&local->connecting_sockets, sk);
|
|
|
|
ret = nfc_llcp_send_connect(llcp_sock);
|
|
if (ret)
|
|
goto sock_unlink;
|
|
|
|
sk->sk_state = LLCP_CONNECTING;
|
|
|
|
ret = sock_wait_state(sk, LLCP_CONNECTED,
|
|
sock_sndtimeo(sk, flags & O_NONBLOCK));
|
|
if (ret && ret != -EINPROGRESS)
|
|
goto sock_unlink;
|
|
|
|
release_sock(sk);
|
|
|
|
return ret;
|
|
|
|
sock_unlink:
|
|
nfc_llcp_put_ssap(local, llcp_sock->ssap);
|
|
|
|
nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
|
|
|
|
put_dev:
|
|
nfc_put_device(dev);
|
|
|
|
error:
|
|
release_sock(sk);
|
|
return ret;
|
|
}
|
|
|
|
static int llcp_sock_sendmsg(struct socket *sock, struct msghdr *msg,
|
|
size_t len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
|
|
int ret;
|
|
|
|
pr_debug("sock %p sk %p", sock, sk);
|
|
|
|
ret = sock_error(sk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (msg->msg_flags & MSG_OOB)
|
|
return -EOPNOTSUPP;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_type == SOCK_DGRAM) {
|
|
DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr,
|
|
msg->msg_name);
|
|
|
|
if (msg->msg_namelen < sizeof(*addr)) {
|
|
release_sock(sk);
|
|
return -EINVAL;
|
|
}
|
|
|
|
release_sock(sk);
|
|
|
|
return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
|
|
msg, len);
|
|
}
|
|
|
|
if (sk->sk_state != LLCP_CONNECTED) {
|
|
release_sock(sk);
|
|
return -ENOTCONN;
|
|
}
|
|
|
|
release_sock(sk);
|
|
|
|
return nfc_llcp_send_i_frame(llcp_sock, msg, len);
|
|
}
|
|
|
|
static int llcp_sock_recvmsg(struct socket *sock, struct msghdr *msg,
|
|
size_t len, int flags)
|
|
{
|
|
int noblock = flags & MSG_DONTWAIT;
|
|
struct sock *sk = sock->sk;
|
|
unsigned int copied, rlen;
|
|
struct sk_buff *skb, *cskb;
|
|
int err = 0;
|
|
|
|
pr_debug("%p %zu\n", sk, len);
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_state == LLCP_CLOSED &&
|
|
skb_queue_empty(&sk->sk_receive_queue)) {
|
|
release_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
release_sock(sk);
|
|
|
|
if (flags & (MSG_OOB))
|
|
return -EOPNOTSUPP;
|
|
|
|
skb = skb_recv_datagram(sk, flags, noblock, &err);
|
|
if (!skb) {
|
|
pr_err("Recv datagram failed state %d %d %d",
|
|
sk->sk_state, err, sock_error(sk));
|
|
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
|
return 0;
|
|
|
|
return err;
|
|
}
|
|
|
|
rlen = skb->len; /* real length of skb */
|
|
copied = min_t(unsigned int, rlen, len);
|
|
|
|
cskb = skb;
|
|
if (skb_copy_datagram_msg(cskb, 0, msg, copied)) {
|
|
if (!(flags & MSG_PEEK))
|
|
skb_queue_head(&sk->sk_receive_queue, skb);
|
|
return -EFAULT;
|
|
}
|
|
|
|
sock_recv_timestamp(msg, sk, skb);
|
|
|
|
if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
|
|
struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
|
|
DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr,
|
|
msg->msg_name);
|
|
|
|
msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
|
|
|
|
pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
|
|
|
|
memset(sockaddr, 0, sizeof(*sockaddr));
|
|
sockaddr->sa_family = AF_NFC;
|
|
sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
|
|
sockaddr->dsap = ui_cb->dsap;
|
|
sockaddr->ssap = ui_cb->ssap;
|
|
}
|
|
|
|
/* 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 ||
|
|
sk->sk_type == SOCK_DGRAM ||
|
|
sk->sk_type == SOCK_RAW) {
|
|
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 = nfc_llcp_setsockopt,
|
|
.getsockopt = nfc_llcp_getsockopt,
|
|
.sendmsg = llcp_sock_sendmsg,
|
|
.recvmsg = llcp_sock_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
};
|
|
|
|
static const struct proto_ops llcp_rawsock_ops = {
|
|
.family = PF_NFC,
|
|
.owner = THIS_MODULE,
|
|
.bind = llcp_raw_sock_bind,
|
|
.connect = sock_no_connect,
|
|
.release = llcp_sock_release,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = llcp_sock_getname,
|
|
.poll = llcp_sock_poll,
|
|
.ioctl = sock_no_ioctl,
|
|
.listen = sock_no_listen,
|
|
.shutdown = sock_no_shutdown,
|
|
.setsockopt = sock_no_setsockopt,
|
|
.getsockopt = sock_no_getsockopt,
|
|
.sendmsg = sock_no_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, int kern)
|
|
{
|
|
struct sock *sk;
|
|
struct nfc_llcp_sock *llcp_sock;
|
|
|
|
sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto, kern);
|
|
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->rw = LLCP_MAX_RW + 1;
|
|
llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
|
|
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;
|
|
llcp_sock->reserved_ssap = LLCP_SAP_MAX;
|
|
nfc_llcp_socket_remote_param_init(llcp_sock);
|
|
skb_queue_head_init(&llcp_sock->tx_queue);
|
|
skb_queue_head_init(&llcp_sock->tx_pending_queue);
|
|
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)
|
|
{
|
|
kfree(sock->service_name);
|
|
|
|
skb_queue_purge(&sock->tx_queue);
|
|
skb_queue_purge(&sock->tx_pending_queue);
|
|
|
|
list_del_init(&sock->accept_queue);
|
|
|
|
sock->parent = NULL;
|
|
|
|
nfc_llcp_local_put(sock->local);
|
|
}
|
|
|
|
static int llcp_sock_create(struct net *net, struct socket *sock,
|
|
const struct nfc_protocol *nfc_proto, int kern)
|
|
{
|
|
struct sock *sk;
|
|
|
|
pr_debug("%p\n", sock);
|
|
|
|
if (sock->type != SOCK_STREAM &&
|
|
sock->type != SOCK_DGRAM &&
|
|
sock->type != SOCK_RAW)
|
|
return -ESOCKTNOSUPPORT;
|
|
|
|
if (sock->type == SOCK_RAW)
|
|
sock->ops = &llcp_rawsock_ops;
|
|
else
|
|
sock->ops = &llcp_sock_ops;
|
|
|
|
sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern);
|
|
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);
|
|
}
|