1444 lines
30 KiB
C
1444 lines
30 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/list.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 u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
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static struct list_head llcp_devices;
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void nfc_llcp_sock_link(struct llcp_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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void nfc_llcp_sock_unlink(struct llcp_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 nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
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{
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struct nfc_llcp_local *local = sock->local;
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struct sk_buff *s, *tmp;
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pr_debug("%p\n", &sock->sk);
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skb_queue_purge(&sock->tx_queue);
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skb_queue_purge(&sock->tx_pending_queue);
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if (local == NULL)
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return;
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/* Search for local pending SKBs that are related to this socket */
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skb_queue_walk_safe(&local->tx_queue, s, tmp) {
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if (s->sk != &sock->sk)
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continue;
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skb_unlink(s, &local->tx_queue);
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kfree_skb(s);
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}
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}
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static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen)
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{
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struct sock *sk;
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struct hlist_node *tmp;
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struct nfc_llcp_sock *llcp_sock;
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skb_queue_purge(&local->tx_queue);
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write_lock(&local->sockets.lock);
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sk_for_each_safe(sk, tmp, &local->sockets.head) {
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llcp_sock = nfc_llcp_sock(sk);
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bh_lock_sock(sk);
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nfc_llcp_socket_purge(llcp_sock);
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if (sk->sk_state == LLCP_CONNECTED)
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nfc_put_device(llcp_sock->dev);
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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,
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&llcp_sock->accept_queue,
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accept_queue) {
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accept_sk = &lsk->sk;
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bh_lock_sock(accept_sk);
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nfc_llcp_accept_unlink(accept_sk);
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accept_sk->sk_state = LLCP_CLOSED;
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bh_unlock_sock(accept_sk);
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sock_orphan(accept_sk);
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}
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if (listen == true) {
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bh_unlock_sock(sk);
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continue;
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}
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}
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/*
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* If we have a connection less socket bound, we keep it alive
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* if the device is still present.
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*/
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if (sk->sk_state == LLCP_BOUND && sk->sk_type == SOCK_DGRAM &&
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listen == true) {
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bh_unlock_sock(sk);
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continue;
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}
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sk->sk_state = LLCP_CLOSED;
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bh_unlock_sock(sk);
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sock_orphan(sk);
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sk_del_node_init(sk);
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}
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write_unlock(&local->sockets.lock);
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}
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struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
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{
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kref_get(&local->ref);
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return local;
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}
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static void local_release(struct kref *ref)
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{
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struct nfc_llcp_local *local;
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local = container_of(ref, struct nfc_llcp_local, ref);
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list_del(&local->list);
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nfc_llcp_socket_release(local, false);
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del_timer_sync(&local->link_timer);
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skb_queue_purge(&local->tx_queue);
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cancel_work_sync(&local->tx_work);
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cancel_work_sync(&local->rx_work);
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cancel_work_sync(&local->timeout_work);
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kfree_skb(local->rx_pending);
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kfree(local);
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}
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int nfc_llcp_local_put(struct nfc_llcp_local *local)
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{
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if (local == NULL)
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return 0;
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return kref_put(&local->ref, local_release);
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}
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static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
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u8 ssap, u8 dsap)
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{
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struct sock *sk;
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struct nfc_llcp_sock *llcp_sock, *tmp_sock;
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pr_debug("ssap dsap %d %d\n", ssap, dsap);
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if (ssap == 0 && dsap == 0)
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return NULL;
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read_lock(&local->sockets.lock);
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llcp_sock = NULL;
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sk_for_each(sk, &local->sockets.head) {
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tmp_sock = nfc_llcp_sock(sk);
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if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
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llcp_sock = tmp_sock;
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break;
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}
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}
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read_unlock(&local->sockets.lock);
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if (llcp_sock == NULL)
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return NULL;
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sock_hold(&llcp_sock->sk);
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return llcp_sock;
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}
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static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
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{
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sock_put(&sock->sk);
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}
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static void nfc_llcp_timeout_work(struct work_struct *work)
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{
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struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
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timeout_work);
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nfc_dep_link_down(local->dev);
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}
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static void nfc_llcp_symm_timer(unsigned long data)
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{
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struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
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pr_err("SYMM timeout\n");
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schedule_work(&local->timeout_work);
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}
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struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
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{
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struct nfc_llcp_local *local, *n;
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list_for_each_entry_safe(local, n, &llcp_devices, list)
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if (local->dev == dev)
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return local;
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pr_debug("No device found\n");
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return NULL;
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}
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static char *wks[] = {
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NULL,
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NULL, /* SDP */
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"urn:nfc:sn:ip",
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"urn:nfc:sn:obex",
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"urn:nfc:sn:snep",
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};
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static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
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{
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int sap, num_wks;
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pr_debug("%s\n", service_name);
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if (service_name == NULL)
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return -EINVAL;
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num_wks = ARRAY_SIZE(wks);
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for (sap = 0; sap < num_wks; sap++) {
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if (wks[sap] == NULL)
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continue;
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if (strncmp(wks[sap], service_name, service_name_len) == 0)
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return sap;
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}
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return -EINVAL;
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}
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static
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struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
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u8 *sn, size_t sn_len)
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{
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struct sock *sk;
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struct nfc_llcp_sock *llcp_sock, *tmp_sock;
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pr_debug("sn %zd %p\n", sn_len, sn);
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if (sn == NULL || sn_len == 0)
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return NULL;
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read_lock(&local->sockets.lock);
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llcp_sock = NULL;
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sk_for_each(sk, &local->sockets.head) {
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tmp_sock = nfc_llcp_sock(sk);
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pr_debug("llcp sock %p\n", tmp_sock);
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if (tmp_sock->sk.sk_type == SOCK_STREAM &&
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tmp_sock->sk.sk_state != LLCP_LISTEN)
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continue;
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if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
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tmp_sock->sk.sk_state != LLCP_BOUND)
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continue;
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if (tmp_sock->service_name == NULL ||
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tmp_sock->service_name_len == 0)
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continue;
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if (tmp_sock->service_name_len != sn_len)
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continue;
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if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
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llcp_sock = tmp_sock;
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break;
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}
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}
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read_unlock(&local->sockets.lock);
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pr_debug("Found llcp sock %p\n", llcp_sock);
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return llcp_sock;
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}
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u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
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struct nfc_llcp_sock *sock)
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{
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mutex_lock(&local->sdp_lock);
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if (sock->service_name != NULL && sock->service_name_len > 0) {
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int ssap = nfc_llcp_wks_sap(sock->service_name,
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sock->service_name_len);
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if (ssap > 0) {
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pr_debug("WKS %d\n", ssap);
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/* This is a WKS, let's check if it's free */
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if (local->local_wks & BIT(ssap)) {
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mutex_unlock(&local->sdp_lock);
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return LLCP_SAP_MAX;
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}
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set_bit(ssap, &local->local_wks);
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mutex_unlock(&local->sdp_lock);
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return ssap;
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}
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/*
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* Check if there already is a non WKS socket bound
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* to this service name.
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*/
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if (nfc_llcp_sock_from_sn(local, sock->service_name,
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sock->service_name_len) != NULL) {
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mutex_unlock(&local->sdp_lock);
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return LLCP_SAP_MAX;
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}
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mutex_unlock(&local->sdp_lock);
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return LLCP_SDP_UNBOUND;
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} else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
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if (!test_bit(sock->ssap, &local->local_wks)) {
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set_bit(sock->ssap, &local->local_wks);
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mutex_unlock(&local->sdp_lock);
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return sock->ssap;
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}
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}
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mutex_unlock(&local->sdp_lock);
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return LLCP_SAP_MAX;
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}
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u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
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{
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u8 local_ssap;
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mutex_lock(&local->sdp_lock);
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local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
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if (local_ssap == LLCP_LOCAL_NUM_SAP) {
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mutex_unlock(&local->sdp_lock);
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return LLCP_SAP_MAX;
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}
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set_bit(local_ssap, &local->local_sap);
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mutex_unlock(&local->sdp_lock);
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return local_ssap + LLCP_LOCAL_SAP_OFFSET;
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}
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void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
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{
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u8 local_ssap;
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unsigned long *sdp;
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if (ssap < LLCP_WKS_NUM_SAP) {
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local_ssap = ssap;
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sdp = &local->local_wks;
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} else if (ssap < LLCP_LOCAL_NUM_SAP) {
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atomic_t *client_cnt;
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local_ssap = ssap - LLCP_WKS_NUM_SAP;
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sdp = &local->local_sdp;
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client_cnt = &local->local_sdp_cnt[local_ssap];
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pr_debug("%d clients\n", atomic_read(client_cnt));
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mutex_lock(&local->sdp_lock);
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if (atomic_dec_and_test(client_cnt)) {
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struct nfc_llcp_sock *l_sock;
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pr_debug("No more clients for SAP %d\n", ssap);
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clear_bit(local_ssap, sdp);
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/* Find the listening sock and set it back to UNBOUND */
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l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
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if (l_sock) {
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l_sock->ssap = LLCP_SDP_UNBOUND;
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nfc_llcp_sock_put(l_sock);
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}
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}
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mutex_unlock(&local->sdp_lock);
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return;
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} else if (ssap < LLCP_MAX_SAP) {
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local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
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sdp = &local->local_sap;
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} else {
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return;
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}
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mutex_lock(&local->sdp_lock);
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clear_bit(local_ssap, sdp);
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mutex_unlock(&local->sdp_lock);
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}
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static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
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{
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u8 ssap;
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mutex_lock(&local->sdp_lock);
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ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
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if (ssap == LLCP_SDP_NUM_SAP) {
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mutex_unlock(&local->sdp_lock);
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return LLCP_SAP_MAX;
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}
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pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
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set_bit(ssap, &local->local_sdp);
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mutex_unlock(&local->sdp_lock);
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return LLCP_WKS_NUM_SAP + ssap;
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}
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static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
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{
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u8 *gb_cur, *version_tlv, version, version_length;
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u8 *lto_tlv, lto_length;
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u8 *wks_tlv, wks_length;
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u8 *miux_tlv, miux_length;
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u8 gb_len = 0;
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int ret = 0;
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version = LLCP_VERSION_11;
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version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
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1, &version_length);
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gb_len += version_length;
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lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length);
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gb_len += lto_length;
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pr_debug("Local wks 0x%lx\n", local->local_wks);
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wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
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&wks_length);
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gb_len += wks_length;
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miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
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&miux_length);
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gb_len += miux_length;
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gb_len += ARRAY_SIZE(llcp_magic);
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if (gb_len > NFC_MAX_GT_LEN) {
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ret = -EINVAL;
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goto out;
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}
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gb_cur = local->gb;
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memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
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gb_cur += ARRAY_SIZE(llcp_magic);
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memcpy(gb_cur, version_tlv, version_length);
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gb_cur += version_length;
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memcpy(gb_cur, lto_tlv, lto_length);
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gb_cur += lto_length;
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memcpy(gb_cur, wks_tlv, wks_length);
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gb_cur += wks_length;
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memcpy(gb_cur, miux_tlv, miux_length);
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gb_cur += miux_length;
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local->gb_len = gb_len;
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out:
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kfree(version_tlv);
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kfree(lto_tlv);
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kfree(wks_tlv);
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kfree(miux_tlv);
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return ret;
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}
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u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
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{
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struct nfc_llcp_local *local;
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local = nfc_llcp_find_local(dev);
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if (local == NULL) {
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*general_bytes_len = 0;
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return NULL;
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}
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|
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nfc_llcp_build_gb(local);
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*general_bytes_len = local->gb_len;
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return local->gb;
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}
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|
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int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
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{
|
|
struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
|
|
|
|
if (local == NULL) {
|
|
pr_err("No LLCP device\n");
|
|
return -ENODEV;
|
|
}
|
|
if (gb_len < 3)
|
|
return -EINVAL;
|
|
|
|
memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
|
|
memcpy(local->remote_gb, gb, gb_len);
|
|
local->remote_gb_len = gb_len;
|
|
|
|
if (memcmp(local->remote_gb, llcp_magic, 3)) {
|
|
pr_err("MAC does not support LLCP\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return nfc_llcp_parse_gb_tlv(local,
|
|
&local->remote_gb[3],
|
|
local->remote_gb_len - 3);
|
|
}
|
|
|
|
static u8 nfc_llcp_dsap(struct sk_buff *pdu)
|
|
{
|
|
return (pdu->data[0] & 0xfc) >> 2;
|
|
}
|
|
|
|
static u8 nfc_llcp_ptype(struct sk_buff *pdu)
|
|
{
|
|
return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
|
|
}
|
|
|
|
static u8 nfc_llcp_ssap(struct sk_buff *pdu)
|
|
{
|
|
return pdu->data[1] & 0x3f;
|
|
}
|
|
|
|
static u8 nfc_llcp_ns(struct sk_buff *pdu)
|
|
{
|
|
return pdu->data[2] >> 4;
|
|
}
|
|
|
|
static u8 nfc_llcp_nr(struct sk_buff *pdu)
|
|
{
|
|
return pdu->data[2] & 0xf;
|
|
}
|
|
|
|
static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
|
|
{
|
|
pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
|
|
sock->send_n = (sock->send_n + 1) % 16;
|
|
sock->recv_ack_n = (sock->recv_n - 1) % 16;
|
|
}
|
|
|
|
void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
|
|
struct sk_buff *skb, u8 direction)
|
|
{
|
|
struct sk_buff *skb_copy = NULL, *nskb;
|
|
struct sock *sk;
|
|
u8 *data;
|
|
|
|
read_lock(&local->raw_sockets.lock);
|
|
|
|
sk_for_each(sk, &local->raw_sockets.head) {
|
|
if (sk->sk_state != LLCP_BOUND)
|
|
continue;
|
|
|
|
if (skb_copy == NULL) {
|
|
skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
|
|
GFP_ATOMIC);
|
|
|
|
if (skb_copy == NULL)
|
|
continue;
|
|
|
|
data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
|
|
|
|
data[0] = local->dev ? local->dev->idx : 0xFF;
|
|
data[1] = direction;
|
|
}
|
|
|
|
nskb = skb_clone(skb_copy, GFP_ATOMIC);
|
|
if (!nskb)
|
|
continue;
|
|
|
|
if (sock_queue_rcv_skb(sk, nskb))
|
|
kfree_skb(nskb);
|
|
}
|
|
|
|
read_unlock(&local->raw_sockets.lock);
|
|
|
|
kfree_skb(skb_copy);
|
|
}
|
|
|
|
static void nfc_llcp_tx_work(struct work_struct *work)
|
|
{
|
|
struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
|
|
tx_work);
|
|
struct sk_buff *skb;
|
|
struct sock *sk;
|
|
struct nfc_llcp_sock *llcp_sock;
|
|
|
|
skb = skb_dequeue(&local->tx_queue);
|
|
if (skb != NULL) {
|
|
sk = skb->sk;
|
|
llcp_sock = nfc_llcp_sock(sk);
|
|
|
|
if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
|
|
nfc_llcp_send_symm(local->dev);
|
|
} else {
|
|
struct sk_buff *copy_skb = NULL;
|
|
u8 ptype = nfc_llcp_ptype(skb);
|
|
int ret;
|
|
|
|
pr_debug("Sending pending skb\n");
|
|
print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
|
|
DUMP_PREFIX_OFFSET, 16, 1,
|
|
skb->data, skb->len, true);
|
|
|
|
if (ptype == LLCP_PDU_I)
|
|
copy_skb = skb_copy(skb, GFP_ATOMIC);
|
|
|
|
__net_timestamp(skb);
|
|
|
|
nfc_llcp_send_to_raw_sock(local, skb,
|
|
NFC_LLCP_DIRECTION_TX);
|
|
|
|
ret = nfc_data_exchange(local->dev, local->target_idx,
|
|
skb, nfc_llcp_recv, local);
|
|
|
|
if (ret) {
|
|
kfree_skb(copy_skb);
|
|
goto out;
|
|
}
|
|
|
|
if (ptype == LLCP_PDU_I && copy_skb)
|
|
skb_queue_tail(&llcp_sock->tx_pending_queue,
|
|
copy_skb);
|
|
}
|
|
} else {
|
|
nfc_llcp_send_symm(local->dev);
|
|
}
|
|
|
|
out:
|
|
mod_timer(&local->link_timer,
|
|
jiffies + msecs_to_jiffies(2 * local->remote_lto));
|
|
}
|
|
|
|
static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
|
|
u8 ssap)
|
|
{
|
|
struct sock *sk;
|
|
struct nfc_llcp_sock *llcp_sock;
|
|
|
|
read_lock(&local->connecting_sockets.lock);
|
|
|
|
sk_for_each(sk, &local->connecting_sockets.head) {
|
|
llcp_sock = nfc_llcp_sock(sk);
|
|
|
|
if (llcp_sock->ssap == ssap) {
|
|
sock_hold(&llcp_sock->sk);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
llcp_sock = NULL;
|
|
|
|
out:
|
|
read_unlock(&local->connecting_sockets.lock);
|
|
|
|
return llcp_sock;
|
|
}
|
|
|
|
static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
|
|
u8 *sn, size_t sn_len)
|
|
{
|
|
struct nfc_llcp_sock *llcp_sock;
|
|
|
|
llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
|
|
|
|
if (llcp_sock == NULL)
|
|
return NULL;
|
|
|
|
sock_hold(&llcp_sock->sk);
|
|
|
|
return llcp_sock;
|
|
}
|
|
|
|
static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
|
|
{
|
|
u8 *tlv = &skb->data[2], type, length;
|
|
size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
|
|
|
|
while (offset < tlv_array_len) {
|
|
type = tlv[0];
|
|
length = tlv[1];
|
|
|
|
pr_debug("type 0x%x length %d\n", type, length);
|
|
|
|
if (type == LLCP_TLV_SN) {
|
|
*sn_len = length;
|
|
return &tlv[2];
|
|
}
|
|
|
|
offset += length + 2;
|
|
tlv += length + 2;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct nfc_llcp_sock *llcp_sock;
|
|
struct nfc_llcp_ui_cb *ui_cb;
|
|
u8 dsap, ssap;
|
|
|
|
dsap = nfc_llcp_dsap(skb);
|
|
ssap = nfc_llcp_ssap(skb);
|
|
|
|
ui_cb = nfc_llcp_ui_skb_cb(skb);
|
|
ui_cb->dsap = dsap;
|
|
ui_cb->ssap = ssap;
|
|
|
|
printk("%s %d %d\n", __func__, dsap, ssap);
|
|
|
|
pr_debug("%d %d\n", dsap, ssap);
|
|
|
|
/* We're looking for a bound socket, not a client one */
|
|
llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
|
|
if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
|
|
return;
|
|
|
|
/* There is no sequence with UI frames */
|
|
skb_pull(skb, LLCP_HEADER_SIZE);
|
|
if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
|
|
/*
|
|
* UI frames will be freed from the socket layer, so we
|
|
* need to keep them alive until someone receives them.
|
|
*/
|
|
skb_get(skb);
|
|
} else {
|
|
pr_err("Receive queue is full\n");
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
nfc_llcp_sock_put(llcp_sock);
|
|
}
|
|
|
|
static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct sock *new_sk, *parent;
|
|
struct nfc_llcp_sock *sock, *new_sock;
|
|
u8 dsap, ssap, reason;
|
|
|
|
dsap = nfc_llcp_dsap(skb);
|
|
ssap = nfc_llcp_ssap(skb);
|
|
|
|
pr_debug("%d %d\n", dsap, ssap);
|
|
|
|
if (dsap != LLCP_SAP_SDP) {
|
|
sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
|
|
if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
|
|
reason = LLCP_DM_NOBOUND;
|
|
goto fail;
|
|
}
|
|
} else {
|
|
u8 *sn;
|
|
size_t sn_len;
|
|
|
|
sn = nfc_llcp_connect_sn(skb, &sn_len);
|
|
if (sn == NULL) {
|
|
reason = LLCP_DM_NOBOUND;
|
|
goto fail;
|
|
}
|
|
|
|
pr_debug("Service name length %zu\n", sn_len);
|
|
|
|
sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
|
|
if (sock == NULL) {
|
|
reason = LLCP_DM_NOBOUND;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
lock_sock(&sock->sk);
|
|
|
|
parent = &sock->sk;
|
|
|
|
if (sk_acceptq_is_full(parent)) {
|
|
reason = LLCP_DM_REJ;
|
|
release_sock(&sock->sk);
|
|
sock_put(&sock->sk);
|
|
goto fail;
|
|
}
|
|
|
|
if (sock->ssap == LLCP_SDP_UNBOUND) {
|
|
u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
|
|
|
|
pr_debug("First client, reserving %d\n", ssap);
|
|
|
|
if (ssap == LLCP_SAP_MAX) {
|
|
reason = LLCP_DM_REJ;
|
|
release_sock(&sock->sk);
|
|
sock_put(&sock->sk);
|
|
goto fail;
|
|
}
|
|
|
|
sock->ssap = ssap;
|
|
}
|
|
|
|
new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
|
|
if (new_sk == NULL) {
|
|
reason = LLCP_DM_REJ;
|
|
release_sock(&sock->sk);
|
|
sock_put(&sock->sk);
|
|
goto fail;
|
|
}
|
|
|
|
new_sock = nfc_llcp_sock(new_sk);
|
|
new_sock->dev = local->dev;
|
|
new_sock->local = nfc_llcp_local_get(local);
|
|
new_sock->miu = local->remote_miu;
|
|
new_sock->nfc_protocol = sock->nfc_protocol;
|
|
new_sock->dsap = ssap;
|
|
new_sock->target_idx = local->target_idx;
|
|
new_sock->parent = parent;
|
|
new_sock->ssap = sock->ssap;
|
|
if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
|
|
atomic_t *client_count;
|
|
|
|
pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
|
|
|
|
client_count =
|
|
&local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
|
|
|
|
atomic_inc(client_count);
|
|
new_sock->reserved_ssap = sock->ssap;
|
|
}
|
|
|
|
nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
|
|
skb->len - LLCP_HEADER_SIZE);
|
|
|
|
pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
|
|
|
|
nfc_llcp_sock_link(&local->sockets, new_sk);
|
|
|
|
nfc_llcp_accept_enqueue(&sock->sk, new_sk);
|
|
|
|
nfc_get_device(local->dev->idx);
|
|
|
|
new_sk->sk_state = LLCP_CONNECTED;
|
|
|
|
/* Wake the listening processes */
|
|
parent->sk_data_ready(parent, 0);
|
|
|
|
/* Send CC */
|
|
nfc_llcp_send_cc(new_sock);
|
|
|
|
release_sock(&sock->sk);
|
|
sock_put(&sock->sk);
|
|
|
|
return;
|
|
|
|
fail:
|
|
/* Send DM */
|
|
nfc_llcp_send_dm(local, dsap, ssap, reason);
|
|
}
|
|
|
|
int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
|
|
{
|
|
int nr_frames = 0;
|
|
struct nfc_llcp_local *local = sock->local;
|
|
|
|
pr_debug("Remote ready %d tx queue len %d remote rw %d",
|
|
sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
|
|
sock->rw);
|
|
|
|
/* Try to queue some I frames for transmission */
|
|
while (sock->remote_ready &&
|
|
skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
|
|
struct sk_buff *pdu;
|
|
|
|
pdu = skb_dequeue(&sock->tx_queue);
|
|
if (pdu == NULL)
|
|
break;
|
|
|
|
/* Update N(S)/N(R) */
|
|
nfc_llcp_set_nrns(sock, pdu);
|
|
|
|
skb_queue_tail(&local->tx_queue, pdu);
|
|
nr_frames++;
|
|
}
|
|
|
|
return nr_frames;
|
|
}
|
|
|
|
static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct nfc_llcp_sock *llcp_sock;
|
|
struct sock *sk;
|
|
u8 dsap, ssap, ptype, ns, nr;
|
|
|
|
ptype = nfc_llcp_ptype(skb);
|
|
dsap = nfc_llcp_dsap(skb);
|
|
ssap = nfc_llcp_ssap(skb);
|
|
ns = nfc_llcp_ns(skb);
|
|
nr = nfc_llcp_nr(skb);
|
|
|
|
pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
|
|
|
|
llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
|
|
if (llcp_sock == NULL) {
|
|
nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
|
|
return;
|
|
}
|
|
|
|
sk = &llcp_sock->sk;
|
|
lock_sock(sk);
|
|
if (sk->sk_state == LLCP_CLOSED) {
|
|
release_sock(sk);
|
|
nfc_llcp_sock_put(llcp_sock);
|
|
}
|
|
|
|
/* Pass the payload upstream */
|
|
if (ptype == LLCP_PDU_I) {
|
|
pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
|
|
|
|
if (ns == llcp_sock->recv_n)
|
|
llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
|
|
else
|
|
pr_err("Received out of sequence I PDU\n");
|
|
|
|
skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
|
|
if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
|
|
/*
|
|
* I frames will be freed from the socket layer, so we
|
|
* need to keep them alive until someone receives them.
|
|
*/
|
|
skb_get(skb);
|
|
} else {
|
|
pr_err("Receive queue is full\n");
|
|
kfree_skb(skb);
|
|
}
|
|
}
|
|
|
|
/* Remove skbs from the pending queue */
|
|
if (llcp_sock->send_ack_n != nr) {
|
|
struct sk_buff *s, *tmp;
|
|
u8 n;
|
|
|
|
llcp_sock->send_ack_n = nr;
|
|
|
|
/* Remove and free all skbs until ns == nr */
|
|
skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
|
|
n = nfc_llcp_ns(s);
|
|
|
|
skb_unlink(s, &llcp_sock->tx_pending_queue);
|
|
kfree_skb(s);
|
|
|
|
if (n == nr)
|
|
break;
|
|
}
|
|
|
|
/* Re-queue the remaining skbs for transmission */
|
|
skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
|
|
s, tmp) {
|
|
skb_unlink(s, &llcp_sock->tx_pending_queue);
|
|
skb_queue_head(&local->tx_queue, s);
|
|
}
|
|
}
|
|
|
|
if (ptype == LLCP_PDU_RR)
|
|
llcp_sock->remote_ready = true;
|
|
else if (ptype == LLCP_PDU_RNR)
|
|
llcp_sock->remote_ready = false;
|
|
|
|
if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
|
|
nfc_llcp_send_rr(llcp_sock);
|
|
|
|
release_sock(sk);
|
|
nfc_llcp_sock_put(llcp_sock);
|
|
}
|
|
|
|
static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct nfc_llcp_sock *llcp_sock;
|
|
struct sock *sk;
|
|
u8 dsap, ssap;
|
|
|
|
dsap = nfc_llcp_dsap(skb);
|
|
ssap = nfc_llcp_ssap(skb);
|
|
|
|
llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
|
|
if (llcp_sock == NULL) {
|
|
nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
|
|
return;
|
|
}
|
|
|
|
sk = &llcp_sock->sk;
|
|
lock_sock(sk);
|
|
|
|
nfc_llcp_socket_purge(llcp_sock);
|
|
|
|
if (sk->sk_state == LLCP_CLOSED) {
|
|
release_sock(sk);
|
|
nfc_llcp_sock_put(llcp_sock);
|
|
}
|
|
|
|
if (sk->sk_state == LLCP_CONNECTED) {
|
|
nfc_put_device(local->dev);
|
|
sk->sk_state = LLCP_CLOSED;
|
|
sk->sk_state_change(sk);
|
|
}
|
|
|
|
nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
|
|
|
|
release_sock(sk);
|
|
nfc_llcp_sock_put(llcp_sock);
|
|
}
|
|
|
|
static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
|
|
{
|
|
struct nfc_llcp_sock *llcp_sock;
|
|
struct sock *sk;
|
|
u8 dsap, ssap;
|
|
|
|
dsap = nfc_llcp_dsap(skb);
|
|
ssap = nfc_llcp_ssap(skb);
|
|
|
|
llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
|
|
if (llcp_sock == NULL) {
|
|
pr_err("Invalid CC\n");
|
|
nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
|
|
|
|
return;
|
|
}
|
|
|
|
sk = &llcp_sock->sk;
|
|
|
|
/* Unlink from connecting and link to the client array */
|
|
nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
|
|
nfc_llcp_sock_link(&local->sockets, sk);
|
|
llcp_sock->dsap = ssap;
|
|
|
|
nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
|
|
skb->len - LLCP_HEADER_SIZE);
|
|
|
|
sk->sk_state = LLCP_CONNECTED;
|
|
sk->sk_state_change(sk);
|
|
|
|
nfc_llcp_sock_put(llcp_sock);
|
|
}
|
|
|
|
static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
|
|
{
|
|
struct nfc_llcp_sock *llcp_sock;
|
|
struct sock *sk;
|
|
u8 dsap, ssap, reason;
|
|
|
|
dsap = nfc_llcp_dsap(skb);
|
|
ssap = nfc_llcp_ssap(skb);
|
|
reason = skb->data[2];
|
|
|
|
pr_debug("%d %d reason %d\n", ssap, dsap, reason);
|
|
|
|
switch (reason) {
|
|
case LLCP_DM_NOBOUND:
|
|
case LLCP_DM_REJ:
|
|
llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
|
|
break;
|
|
|
|
default:
|
|
llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
|
|
break;
|
|
}
|
|
|
|
if (llcp_sock == NULL) {
|
|
pr_debug("Already closed\n");
|
|
return;
|
|
}
|
|
|
|
sk = &llcp_sock->sk;
|
|
|
|
sk->sk_err = ENXIO;
|
|
sk->sk_state = LLCP_CLOSED;
|
|
sk->sk_state_change(sk);
|
|
|
|
nfc_llcp_sock_put(llcp_sock);
|
|
}
|
|
|
|
static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct nfc_llcp_sock *llcp_sock;
|
|
u8 dsap, ssap, *tlv, type, length, tid, sap;
|
|
u16 tlv_len, offset;
|
|
char *service_name;
|
|
size_t service_name_len;
|
|
|
|
dsap = nfc_llcp_dsap(skb);
|
|
ssap = nfc_llcp_ssap(skb);
|
|
|
|
pr_debug("%d %d\n", dsap, ssap);
|
|
|
|
if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
|
|
pr_err("Wrong SNL SAP\n");
|
|
return;
|
|
}
|
|
|
|
tlv = &skb->data[LLCP_HEADER_SIZE];
|
|
tlv_len = skb->len - LLCP_HEADER_SIZE;
|
|
offset = 0;
|
|
|
|
while (offset < tlv_len) {
|
|
type = tlv[0];
|
|
length = tlv[1];
|
|
|
|
switch (type) {
|
|
case LLCP_TLV_SDREQ:
|
|
tid = tlv[2];
|
|
service_name = (char *) &tlv[3];
|
|
service_name_len = length - 1;
|
|
|
|
pr_debug("Looking for %.16s\n", service_name);
|
|
|
|
if (service_name_len == strlen("urn:nfc:sn:sdp") &&
|
|
!strncmp(service_name, "urn:nfc:sn:sdp",
|
|
service_name_len)) {
|
|
sap = 1;
|
|
goto send_snl;
|
|
}
|
|
|
|
llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
|
|
service_name_len);
|
|
if (!llcp_sock) {
|
|
sap = 0;
|
|
goto send_snl;
|
|
}
|
|
|
|
/*
|
|
* We found a socket but its ssap has not been reserved
|
|
* yet. We need to assign it for good and send a reply.
|
|
* The ssap will be freed when the socket is closed.
|
|
*/
|
|
if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
|
|
atomic_t *client_count;
|
|
|
|
sap = nfc_llcp_reserve_sdp_ssap(local);
|
|
|
|
pr_debug("Reserving %d\n", sap);
|
|
|
|
if (sap == LLCP_SAP_MAX) {
|
|
sap = 0;
|
|
goto send_snl;
|
|
}
|
|
|
|
client_count =
|
|
&local->local_sdp_cnt[sap -
|
|
LLCP_WKS_NUM_SAP];
|
|
|
|
atomic_inc(client_count);
|
|
|
|
llcp_sock->ssap = sap;
|
|
llcp_sock->reserved_ssap = sap;
|
|
} else {
|
|
sap = llcp_sock->ssap;
|
|
}
|
|
|
|
pr_debug("%p %d\n", llcp_sock, sap);
|
|
|
|
send_snl:
|
|
nfc_llcp_send_snl(local, tid, sap);
|
|
break;
|
|
|
|
default:
|
|
pr_err("Invalid SNL tlv value 0x%x\n", type);
|
|
break;
|
|
}
|
|
|
|
offset += length + 2;
|
|
tlv += length + 2;
|
|
}
|
|
}
|
|
|
|
static void nfc_llcp_rx_work(struct work_struct *work)
|
|
{
|
|
struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
|
|
rx_work);
|
|
u8 dsap, ssap, ptype;
|
|
struct sk_buff *skb;
|
|
|
|
skb = local->rx_pending;
|
|
if (skb == NULL) {
|
|
pr_debug("No pending SKB\n");
|
|
return;
|
|
}
|
|
|
|
ptype = nfc_llcp_ptype(skb);
|
|
dsap = nfc_llcp_dsap(skb);
|
|
ssap = nfc_llcp_ssap(skb);
|
|
|
|
pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
|
|
|
|
if (ptype != LLCP_PDU_SYMM)
|
|
print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
|
|
16, 1, skb->data, skb->len, true);
|
|
|
|
__net_timestamp(skb);
|
|
|
|
nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
|
|
|
|
switch (ptype) {
|
|
case LLCP_PDU_SYMM:
|
|
pr_debug("SYMM\n");
|
|
break;
|
|
|
|
case LLCP_PDU_UI:
|
|
pr_debug("UI\n");
|
|
nfc_llcp_recv_ui(local, skb);
|
|
break;
|
|
|
|
case LLCP_PDU_CONNECT:
|
|
pr_debug("CONNECT\n");
|
|
nfc_llcp_recv_connect(local, skb);
|
|
break;
|
|
|
|
case LLCP_PDU_DISC:
|
|
pr_debug("DISC\n");
|
|
nfc_llcp_recv_disc(local, skb);
|
|
break;
|
|
|
|
case LLCP_PDU_CC:
|
|
pr_debug("CC\n");
|
|
nfc_llcp_recv_cc(local, skb);
|
|
break;
|
|
|
|
case LLCP_PDU_DM:
|
|
pr_debug("DM\n");
|
|
nfc_llcp_recv_dm(local, skb);
|
|
break;
|
|
|
|
case LLCP_PDU_SNL:
|
|
pr_debug("SNL\n");
|
|
nfc_llcp_recv_snl(local, skb);
|
|
break;
|
|
|
|
case LLCP_PDU_I:
|
|
case LLCP_PDU_RR:
|
|
case LLCP_PDU_RNR:
|
|
pr_debug("I frame\n");
|
|
nfc_llcp_recv_hdlc(local, skb);
|
|
break;
|
|
|
|
}
|
|
|
|
schedule_work(&local->tx_work);
|
|
kfree_skb(local->rx_pending);
|
|
local->rx_pending = NULL;
|
|
}
|
|
|
|
static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
|
|
{
|
|
local->rx_pending = skb;
|
|
del_timer(&local->link_timer);
|
|
schedule_work(&local->rx_work);
|
|
}
|
|
|
|
void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
|
|
{
|
|
struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
|
|
|
|
pr_debug("Received an LLCP PDU\n");
|
|
if (err < 0) {
|
|
pr_err("err %d\n", err);
|
|
return;
|
|
}
|
|
|
|
__nfc_llcp_recv(local, skb);
|
|
}
|
|
|
|
int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
|
|
{
|
|
struct nfc_llcp_local *local;
|
|
|
|
local = nfc_llcp_find_local(dev);
|
|
if (local == NULL)
|
|
return -ENODEV;
|
|
|
|
__nfc_llcp_recv(local, skb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void nfc_llcp_mac_is_down(struct nfc_dev *dev)
|
|
{
|
|
struct nfc_llcp_local *local;
|
|
|
|
local = nfc_llcp_find_local(dev);
|
|
if (local == NULL)
|
|
return;
|
|
|
|
/* Close and purge all existing sockets */
|
|
nfc_llcp_socket_release(local, true);
|
|
}
|
|
|
|
void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
|
|
u8 comm_mode, u8 rf_mode)
|
|
{
|
|
struct nfc_llcp_local *local;
|
|
|
|
pr_debug("rf mode %d\n", rf_mode);
|
|
|
|
local = nfc_llcp_find_local(dev);
|
|
if (local == NULL)
|
|
return;
|
|
|
|
local->target_idx = target_idx;
|
|
local->comm_mode = comm_mode;
|
|
local->rf_mode = rf_mode;
|
|
|
|
if (rf_mode == NFC_RF_INITIATOR) {
|
|
pr_debug("Queueing Tx work\n");
|
|
|
|
schedule_work(&local->tx_work);
|
|
} else {
|
|
mod_timer(&local->link_timer,
|
|
jiffies + msecs_to_jiffies(local->remote_lto));
|
|
}
|
|
}
|
|
|
|
int nfc_llcp_register_device(struct nfc_dev *ndev)
|
|
{
|
|
struct nfc_llcp_local *local;
|
|
|
|
local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
|
|
if (local == NULL)
|
|
return -ENOMEM;
|
|
|
|
local->dev = ndev;
|
|
INIT_LIST_HEAD(&local->list);
|
|
kref_init(&local->ref);
|
|
mutex_init(&local->sdp_lock);
|
|
init_timer(&local->link_timer);
|
|
local->link_timer.data = (unsigned long) local;
|
|
local->link_timer.function = nfc_llcp_symm_timer;
|
|
|
|
skb_queue_head_init(&local->tx_queue);
|
|
INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
|
|
|
|
local->rx_pending = NULL;
|
|
INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
|
|
|
|
INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
|
|
|
|
rwlock_init(&local->sockets.lock);
|
|
rwlock_init(&local->connecting_sockets.lock);
|
|
rwlock_init(&local->raw_sockets.lock);
|
|
|
|
local->lto = 150; /* 1500 ms */
|
|
local->rw = LLCP_MAX_RW;
|
|
local->miux = cpu_to_be16(LLCP_MAX_MIUX);
|
|
|
|
nfc_llcp_build_gb(local);
|
|
|
|
local->remote_miu = LLCP_DEFAULT_MIU;
|
|
local->remote_lto = LLCP_DEFAULT_LTO;
|
|
|
|
list_add(&local->list, &llcp_devices);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void nfc_llcp_unregister_device(struct nfc_dev *dev)
|
|
{
|
|
struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
|
|
|
|
if (local == NULL) {
|
|
pr_debug("No such device\n");
|
|
return;
|
|
}
|
|
|
|
nfc_llcp_local_put(local);
|
|
}
|
|
|
|
int __init nfc_llcp_init(void)
|
|
{
|
|
INIT_LIST_HEAD(&llcp_devices);
|
|
|
|
return nfc_llcp_sock_init();
|
|
}
|
|
|
|
void nfc_llcp_exit(void)
|
|
{
|
|
nfc_llcp_sock_exit();
|
|
}
|