Release 4.11 net/nfc/llcp_core.c

/*
 * Copyright (C) 2011  Intel Corporation. All rights reserved.
 * Copyright (C) 2014 Marvell International Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */


#define pr_fmt(fmt) "llcp: %s: " fmt, __func__

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/nfc.h>

#include "nfc.h"
#include "llcp.h"


static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};

static LIST_HEAD(llcp_devices);

static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);



void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
{
	write_lock(&l->lock);
	sk_add_node(sk, &l->head);
	write_unlock(&l->lock);
}

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void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
{
	write_lock(&l->lock);
	sk_del_node_init(sk);
	write_unlock(&l->lock);
}

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void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
{
	sock->remote_rw = LLCP_DEFAULT_RW;
	sock->remote_miu = LLCP_MAX_MIU + 1;
}

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static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
{
	struct nfc_llcp_local *local = sock->local;
	struct sk_buff *s, *tmp;

	pr_debug("%p\n", &sock->sk);

	skb_queue_purge(&sock->tx_queue);
	skb_queue_purge(&sock->tx_pending_queue);

	if (local == NULL)
		return;

	/* Search for local pending SKBs that are related to this socket */
	skb_queue_walk_safe(&local->tx_queue, s, tmp) {
		if (s->sk != &sock->sk)
			continue;

		skb_unlink(s, &local->tx_queue);
		kfree_skb(s);
	}
}

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static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
				    int err)
{
	struct sock *sk;
	struct hlist_node *tmp;
	struct nfc_llcp_sock *llcp_sock;

	skb_queue_purge(&local->tx_queue);

	write_lock(&local->sockets.lock);

	sk_for_each_safe(sk, tmp, &local->sockets.head) {
		llcp_sock = nfc_llcp_sock(sk);

		bh_lock_sock(sk);

		nfc_llcp_socket_purge(llcp_sock);

		if (sk->sk_state == LLCP_CONNECTED)
			nfc_put_device(llcp_sock->dev);

		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;
				bh_lock_sock(accept_sk);

				nfc_llcp_accept_unlink(accept_sk);

				if (err)
					accept_sk->sk_err = err;
				accept_sk->sk_state = LLCP_CLOSED;
				accept_sk->sk_state_change(sk);

				bh_unlock_sock(accept_sk);
			}
		}

		if (err)
			sk->sk_err = err;
		sk->sk_state = LLCP_CLOSED;
		sk->sk_state_change(sk);

		bh_unlock_sock(sk);

		sk_del_node_init(sk);
	}

	write_unlock(&local->sockets.lock);

	/* If we still have a device, we keep the RAW sockets alive */
	if (device == true)
		return;

	write_lock(&local->raw_sockets.lock);

	sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
		llcp_sock = nfc_llcp_sock(sk);

		bh_lock_sock(sk);

		nfc_llcp_socket_purge(llcp_sock);

		if (err)
			sk->sk_err = err;
		sk->sk_state = LLCP_CLOSED;
		sk->sk_state_change(sk);

		bh_unlock_sock(sk);

		sk_del_node_init(sk);
	}

	write_unlock(&local->raw_sockets.lock);
}

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struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
{
	kref_get(&local->ref);

	return local;
}

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static void local_cleanup(struct nfc_llcp_local *local)
{
	nfc_llcp_socket_release(local, false, ENXIO);
	del_timer_sync(&local->link_timer);
	skb_queue_purge(&local->tx_queue);
	cancel_work_sync(&local->tx_work);
	cancel_work_sync(&local->rx_work);
	cancel_work_sync(&local->timeout_work);
	kfree_skb(local->rx_pending);
	del_timer_sync(&local->sdreq_timer);
	cancel_work_sync(&local->sdreq_timeout_work);
	nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
}

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static void local_release(struct kref *ref)
{
	struct nfc_llcp_local *local;

	local = container_of(ref, struct nfc_llcp_local, ref);

	list_del(&local->list);
	local_cleanup(local);
	kfree(local);
}

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int nfc_llcp_local_put(struct nfc_llcp_local *local)
{
	if (local == NULL)
		return 0;

	return kref_put(&local->ref, local_release);
}

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static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
					       u8 ssap, u8 dsap)
{
	struct sock *sk;
	struct nfc_llcp_sock *llcp_sock, *tmp_sock;

	pr_debug("ssap dsap %d %d\n", ssap, dsap);

	if (ssap == 0 && dsap == 0)
		return NULL;

	read_lock(&local->sockets.lock);

	llcp_sock = NULL;

	sk_for_each(sk, &local->sockets.head) {
		tmp_sock = nfc_llcp_sock(sk);

		if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
			llcp_sock = tmp_sock;
			break;
		}
	}

	read_unlock(&local->sockets.lock);

	if (llcp_sock == NULL)
		return NULL;

	sock_hold(&llcp_sock->sk);

	return llcp_sock;
}

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static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
{
	sock_put(&sock->sk);
}

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static void nfc_llcp_timeout_work(struct work_struct *work)
{
	struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
						    timeout_work);

	nfc_dep_link_down(local->dev);
}

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static void nfc_llcp_symm_timer(unsigned long data)
{
	struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;

	pr_err("SYMM timeout\n");

	schedule_work(&local->timeout_work);
}

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static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
{
	unsigned long time;
	HLIST_HEAD(nl_sdres_list);
	struct hlist_node *n;
	struct nfc_llcp_sdp_tlv *sdp;
	struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
						    sdreq_timeout_work);

	mutex_lock(&local->sdreq_lock);

	time = jiffies - msecs_to_jiffies(3 * local->remote_lto);

	hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
		if (time_after(sdp->time, time))
			continue;

		sdp->sap = LLCP_SDP_UNBOUND;

		hlist_del(&sdp->node);

		hlist_add_head(&sdp->node, &nl_sdres_list);
	}

	if (!hlist_empty(&local->pending_sdreqs))
		mod_timer(&local->sdreq_timer,
			  jiffies + msecs_to_jiffies(3 * local->remote_lto));

	mutex_unlock(&local->sdreq_lock);

	if (!hlist_empty(&nl_sdres_list))
		nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
}

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static void nfc_llcp_sdreq_timer(unsigned long data)
{
	struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;

	schedule_work(&local->sdreq_timeout_work);
}

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struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
{
	struct nfc_llcp_local *local;

	list_for_each_entry(local, &llcp_devices, list)
		if (local->dev == dev)
			return local;

	pr_debug("No device found\n");

	return NULL;
}

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static char *wks[] = {
	NULL,
	NULL, /* SDP */
	"urn:nfc:sn:ip",
	"urn:nfc:sn:obex",
	"urn:nfc:sn:snep",
};



static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
{
	int sap, num_wks;

	pr_debug("%s\n", service_name);

	if (service_name == NULL)
		return -EINVAL;

	num_wks = ARRAY_SIZE(wks);

	for (sap = 0; sap < num_wks; sap++) {
		if (wks[sap] == NULL)
			continue;

		if (strncmp(wks[sap], service_name, service_name_len) == 0)
			return sap;
	}

	return -EINVAL;
}

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static

struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
					    u8 *sn, size_t sn_len)
{
	struct sock *sk;
	struct nfc_llcp_sock *llcp_sock, *tmp_sock;

	pr_debug("sn %zd %p\n", sn_len, sn);

	if (sn == NULL || sn_len == 0)
		return NULL;

	read_lock(&local->sockets.lock);

	llcp_sock = NULL;

	sk_for_each(sk, &local->sockets.head) {
		tmp_sock = nfc_llcp_sock(sk);

		pr_debug("llcp sock %p\n", tmp_sock);

		if (tmp_sock->sk.sk_type == SOCK_STREAM &&
		    tmp_sock->sk.sk_state != LLCP_LISTEN)
			continue;

		if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
		    tmp_sock->sk.sk_state != LLCP_BOUND)
			continue;

		if (tmp_sock->service_name == NULL ||
		    tmp_sock->service_name_len == 0)
			continue;

		if (tmp_sock->service_name_len != sn_len)
			continue;

		if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
			llcp_sock = tmp_sock;
			break;
		}
	}

	read_unlock(&local->sockets.lock);

	pr_debug("Found llcp sock %p\n", llcp_sock);

	return llcp_sock;
}

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u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
			 struct nfc_llcp_sock *sock)
{
	mutex_lock(&local->sdp_lock);

	if (sock->service_name != NULL && sock->service_name_len > 0) {
		int ssap = nfc_llcp_wks_sap(sock->service_name,
					    sock->service_name_len);

		if (ssap > 0) {
			pr_debug("WKS %d\n", ssap);

			/* This is a WKS, let's check if it's free */
			if (local->local_wks & BIT(ssap)) {
				mutex_unlock(&local->sdp_lock);

				return LLCP_SAP_MAX;
			}

			set_bit(ssap, &local->local_wks);
			mutex_unlock(&local->sdp_lock);

			return ssap;
		}

		/*
                 * Check if there already is a non WKS socket bound
                 * to this service name.
                 */
		if (nfc_llcp_sock_from_sn(local, sock->service_name,
					  sock->service_name_len) != NULL) {
			mutex_unlock(&local->sdp_lock);

			return LLCP_SAP_MAX;
		}

		mutex_unlock(&local->sdp_lock);

		return LLCP_SDP_UNBOUND;

	} else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
		if (!test_bit(sock->ssap, &local->local_wks)) {
			set_bit(sock->ssap, &local->local_wks);
			mutex_unlock(&local->sdp_lock);

			return sock->ssap;
		}
	}

	mutex_unlock(&local->sdp_lock);

	return LLCP_SAP_MAX;
}

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u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
{
	u8 local_ssap;

	mutex_lock(&local->sdp_lock);

	local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
	if (local_ssap == LLCP_LOCAL_NUM_SAP) {
		mutex_unlock(&local->sdp_lock);
		return LLCP_SAP_MAX;
	}

	set_bit(local_ssap, &local->local_sap);

	mutex_unlock(&local->sdp_lock);

	return local_ssap + LLCP_LOCAL_SAP_OFFSET;
}

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void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
{
	u8 local_ssap;
	unsigned long *sdp;

	if (ssap < LLCP_WKS_NUM_SAP) {
		local_ssap = ssap;
		sdp = &local->local_wks;
	} else if (ssap < LLCP_LOCAL_NUM_SAP) {
		atomic_t *client_cnt;

		local_ssap = ssap - LLCP_WKS_NUM_SAP;
		sdp = &local->local_sdp;
		client_cnt = &local->local_sdp_cnt[local_ssap];

		pr_debug("%d clients\n", atomic_read(client_cnt));

		mutex_lock(&local->sdp_lock);

		if (atomic_dec_and_test(client_cnt)) {
			struct nfc_llcp_sock *l_sock;

			pr_debug("No more clients for SAP %d\n", ssap);

			clear_bit(local_ssap, sdp);

			/* Find the listening sock and set it back to UNBOUND */
			l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
			if (l_sock) {
				l_sock->ssap = LLCP_SDP_UNBOUND;
				nfc_llcp_sock_put(l_sock);
			}
		}

		mutex_unlock(&local->sdp_lock);

		return;
	} else if (ssap < LLCP_MAX_SAP) {
		local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
		sdp = &local->local_sap;
	} else {
		return;
	}

	mutex_lock(&local->sdp_lock);

	clear_bit(local_ssap, sdp);

	mutex_unlock(&local->sdp_lock);
}

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static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
{
	u8 ssap;

	mutex_lock(&local->sdp_lock);

	ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
	if (ssap == LLCP_SDP_NUM_SAP) {
		mutex_unlock(&local->sdp_lock);

		return LLCP_SAP_MAX;
	}

	pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);

	set_bit(ssap, &local->local_sdp);

	mutex_unlock(&local->sdp_lock);

	return LLCP_WKS_NUM_SAP + ssap;
}

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static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
{
	u8 *gb_cur, *version_tlv, version, version_length;
	u8 *lto_tlv, lto_length;
	u8 *wks_tlv, wks_length;
	u8 *miux_tlv, miux_length;
	__be16 wks = cpu_to_be16(local->local_wks);
	u8 gb_len = 0;
	int ret = 0;

	version = LLCP_VERSION_11;
	version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
					 1, &version_length);
	gb_len += version_length;

	lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
	gb_len += lto_length;

	pr_debug("Local wks 0x%lx\n", local->local_wks);
	wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
	gb_len += wks_length;

	miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
				      &miux_length);
	gb_len += miux_length;

	gb_len += ARRAY_SIZE(llcp_magic);

	if (gb_len > NFC_MAX_GT_LEN) {
		ret = -EINVAL;
		goto out;
	}

	gb_cur = local->gb;

	memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
	gb_cur += ARRAY_SIZE(llcp_magic);

	memcpy(gb_cur, version_tlv, version_length);
	gb_cur += version_length;

	memcpy(gb_cur, lto_tlv, lto_length);
	gb_cur += lto_length;

	memcpy(gb_cur, wks_tlv, wks_length);
	gb_cur += wks_length;

	memcpy(gb_cur, miux_tlv, miux_length);
	gb_cur += miux_length;

	local->gb_len = gb_len;

out:
	kfree(version_tlv);
	kfree(lto_tlv);
	kfree(wks_tlv);
	kfree(miux_tlv);

	return ret;
}

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u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
{
	struct nfc_llcp_local *local;

	local = nfc_llcp_find_local(dev);
	if (local == NULL) {
		*general_bytes_len = 0;
		return NULL;
	}

	nfc_llcp_build_gb(local);

	*general_bytes_len = local->gb_len;

	return local->gb;
}

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int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
{
	struct nfc_llcp_local *local;

	if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
		return -EINVAL;

	local = nfc_llcp_find_local(dev);
	if (local == NULL) {
		pr_err("No LLCP device\n");
		return -ENODEV;
	}

	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);
}

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3
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static u8 nfc_llcp_dsap(struct sk_buff *pdu)
{
	return (pdu->data[0] & 0xfc) >> 2;
}

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static u8 nfc_llcp_ptype(struct sk_buff *pdu)
{
	return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
}

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static u8 nfc_llcp_ssap(struct sk_buff *pdu)
{
	return pdu->data[1] & 0x3f;
}

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static u8 nfc_llcp_ns(struct sk_buff *pdu)
{
	return pdu->data[2] >> 4;
}

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static u8 nfc_llcp_nr(struct sk_buff *pdu)
{
	return pdu->data[2] & 0xf;
}

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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;
}

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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_fclone(skb, NFC_RAW_HEADER_SIZE,
						      GFP_ATOMIC, true);

			if (skb_copy == NULL)
				continue;

			data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);

			data[0] = local->dev ? local->dev->idx : 0xFF;
			data[1] = direction & 0x01;
			data[1] |= (RAW_PAYLOAD_LLCP << 1);
		}

		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);
}

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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) {
			kfree_skb(skb);
			nfc_llcp_send_symm(local->dev);
		} else if (llcp_sock && !llcp_sock->remote_ready) {
			skb_queue_head(&local->tx_queue, skb);
			nfc_llcp_send_symm(local->dev);
		} else {
			struct sk_buff *copy_skb = NULL;
			u8 ptype = nfc_llcp_ptype(skb);
			int ret