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419 lines
8.9 KiB
419 lines
8.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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 <[email protected]> |
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* Lauro Ramos Venancio <[email protected]> |
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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_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 put_dev; |
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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_hardirq()); |
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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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.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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.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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if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
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return -EPERM; |
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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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} |
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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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