2011-09-18 15:19:35 +07:00
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/*
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* The NFC Controller Interface is the communication protocol between an
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* NFC Controller (NFCC) and a Device Host (DH).
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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2014-10-21 21:52:49 +07:00
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* Copyright (C) 2014 Marvell International Ltd.
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2011-09-18 15:19:35 +07:00
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*
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* Written by Ilan Elias <ilane@ti.com>
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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 version 2
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* as published by the Free Software Foundation
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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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2013-12-06 23:56:16 +07:00
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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2011-09-18 15:19:35 +07:00
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*
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*/
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2011-12-14 22:43:05 +07:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
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2011-11-30 02:37:32 +07:00
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2011-09-18 15:19:35 +07:00
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/wait.h>
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#include <linux/bitops.h>
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#include <linux/skbuff.h>
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#include "../nfc.h"
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#include <net/nfc/nci.h>
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#include <net/nfc/nci_core.h>
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#include <linux/nfc.h>
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/* Complete data exchange transaction and forward skb to nfc core */
|
2012-03-05 07:03:54 +07:00
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void nci_data_exchange_complete(struct nci_dev *ndev, struct sk_buff *skb,
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2015-02-02 04:26:08 +07:00
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__u8 conn_id, int err)
|
2011-09-18 15:19:35 +07:00
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|
{
|
2015-02-02 04:26:08 +07:00
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struct nci_conn_info *conn_info;
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data_exchange_cb_t cb;
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void *cb_context;
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conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
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if (!conn_info) {
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kfree_skb(skb);
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goto exit;
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}
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cb = conn_info->data_exchange_cb;
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cb_context = conn_info->data_exchange_cb_context;
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2011-09-18 15:19:35 +07:00
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2011-11-30 02:37:35 +07:00
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pr_debug("len %d, err %d\n", skb ? skb->len : 0, err);
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2011-09-18 15:19:35 +07:00
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2012-01-17 17:03:50 +07:00
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/* data exchange is complete, stop the data timer */
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del_timer_sync(&ndev->data_timer);
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clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
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2011-09-18 15:19:35 +07:00
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if (cb) {
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/* forward skb to nfc core */
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cb(cb_context, skb, err);
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} else if (skb) {
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2011-11-30 02:37:32 +07:00
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pr_err("no rx callback, dropping rx data...\n");
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2011-09-18 15:19:35 +07:00
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/* no waiting callback, free skb */
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kfree_skb(skb);
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}
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2011-09-22 15:36:19 +07:00
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2015-02-02 04:26:08 +07:00
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exit:
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2011-09-22 15:36:19 +07:00
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clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
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2011-09-18 15:19:35 +07:00
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}
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/* ----------------- NCI TX Data ----------------- */
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static inline void nci_push_data_hdr(struct nci_dev *ndev,
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2012-03-05 07:03:54 +07:00
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__u8 conn_id,
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struct sk_buff *skb,
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__u8 pbf)
|
2011-09-18 15:19:35 +07:00
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{
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struct nci_data_hdr *hdr;
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int plen = skb->len;
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|
|
|
|
networking: make skb_push & __skb_push return void pointers
It seems like a historic accident that these return unsigned char *,
and in many places that means casts are required, more often than not.
Make these functions return void * and remove all the casts across
the tree, adding a (u8 *) cast only where the unsigned char pointer
was used directly, all done with the following spatch:
@@
expression SKB, LEN;
typedef u8;
identifier fn = { skb_push, __skb_push, skb_push_rcsum };
@@
- *(fn(SKB, LEN))
+ *(u8 *)fn(SKB, LEN)
@@
expression E, SKB, LEN;
identifier fn = { skb_push, __skb_push, skb_push_rcsum };
type T;
@@
- E = ((T *)(fn(SKB, LEN)))
+ E = fn(SKB, LEN)
@@
expression SKB, LEN;
identifier fn = { skb_push, __skb_push, skb_push_rcsum };
@@
- fn(SKB, LEN)[0]
+ *(u8 *)fn(SKB, LEN)
Note that the last part there converts from push(...)[0] to the
more idiomatic *(u8 *)push(...).
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16 19:29:23 +07:00
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hdr = skb_push(skb, NCI_DATA_HDR_SIZE);
|
2011-09-18 15:19:35 +07:00
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hdr->conn_id = conn_id;
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hdr->rfu = 0;
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hdr->plen = plen;
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nci_mt_set((__u8 *)hdr, NCI_MT_DATA_PKT);
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nci_pbf_set((__u8 *)hdr, pbf);
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}
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|
2015-10-22 16:11:34 +07:00
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int nci_conn_max_data_pkt_payload_size(struct nci_dev *ndev, __u8 conn_id)
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{
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struct nci_conn_info *conn_info;
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conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
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if (!conn_info)
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return -EPROTO;
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return conn_info->max_pkt_payload_len;
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}
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EXPORT_SYMBOL(nci_conn_max_data_pkt_payload_size);
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|
2011-09-18 15:19:35 +07:00
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static int nci_queue_tx_data_frags(struct nci_dev *ndev,
|
2012-03-05 07:03:54 +07:00
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|
__u8 conn_id,
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struct sk_buff *skb) {
|
2015-02-02 04:26:08 +07:00
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|
|
struct nci_conn_info *conn_info;
|
2011-09-18 15:19:35 +07:00
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int total_len = skb->len;
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unsigned char *data = skb->data;
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unsigned long flags;
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struct sk_buff_head frags_q;
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struct sk_buff *skb_frag;
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int frag_len;
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int rc = 0;
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|
2011-11-30 02:37:35 +07:00
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pr_debug("conn_id 0x%x, total_len %d\n", conn_id, total_len);
|
2011-09-18 15:19:35 +07:00
|
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|
2015-02-02 04:26:08 +07:00
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conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
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if (!conn_info) {
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rc = -EPROTO;
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goto free_exit;
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}
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2011-09-18 15:19:35 +07:00
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__skb_queue_head_init(&frags_q);
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while (total_len) {
|
2011-11-09 17:09:14 +07:00
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frag_len =
|
2015-02-02 04:26:08 +07:00
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min_t(int, total_len, conn_info->max_pkt_payload_len);
|
2011-09-18 15:19:35 +07:00
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skb_frag = nci_skb_alloc(ndev,
|
2012-03-05 07:03:54 +07:00
|
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(NCI_DATA_HDR_SIZE + frag_len),
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|
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GFP_KERNEL);
|
2011-09-18 15:19:35 +07:00
|
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|
if (skb_frag == NULL) {
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|
rc = -ENOMEM;
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|
|
|
goto free_exit;
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|
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|
}
|
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|
skb_reserve(skb_frag, NCI_DATA_HDR_SIZE);
|
|
|
|
|
|
|
|
/* first, copy the data */
|
networking: introduce and use skb_put_data()
A common pattern with skb_put() is to just want to memcpy()
some data into the new space, introduce skb_put_data() for
this.
An spatch similar to the one for skb_put_zero() converts many
of the places using it:
@@
identifier p, p2;
expression len, skb, data;
type t, t2;
@@
(
-p = skb_put(skb, len);
+p = skb_put_data(skb, data, len);
|
-p = (t)skb_put(skb, len);
+p = skb_put_data(skb, data, len);
)
(
p2 = (t2)p;
-memcpy(p2, data, len);
|
-memcpy(p, data, len);
)
@@
type t, t2;
identifier p, p2;
expression skb, data;
@@
t *p;
...
(
-p = skb_put(skb, sizeof(t));
+p = skb_put_data(skb, data, sizeof(t));
|
-p = (t *)skb_put(skb, sizeof(t));
+p = skb_put_data(skb, data, sizeof(t));
)
(
p2 = (t2)p;
-memcpy(p2, data, sizeof(*p));
|
-memcpy(p, data, sizeof(*p));
)
@@
expression skb, len, data;
@@
-memcpy(skb_put(skb, len), data, len);
+skb_put_data(skb, data, len);
(again, manually post-processed to retain some comments)
Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16 19:29:20 +07:00
|
|
|
skb_put_data(skb_frag, data, frag_len);
|
2011-09-18 15:19:35 +07:00
|
|
|
|
|
|
|
/* second, set the header */
|
|
|
|
nci_push_data_hdr(ndev, conn_id, skb_frag,
|
2012-03-05 07:03:54 +07:00
|
|
|
((total_len == frag_len) ?
|
|
|
|
(NCI_PBF_LAST) : (NCI_PBF_CONT)));
|
2011-09-18 15:19:35 +07:00
|
|
|
|
|
|
|
__skb_queue_tail(&frags_q, skb_frag);
|
|
|
|
|
|
|
|
data += frag_len;
|
|
|
|
total_len -= frag_len;
|
|
|
|
|
2011-11-30 02:37:33 +07:00
|
|
|
pr_debug("frag_len %d, remaining total_len %d\n",
|
|
|
|
frag_len, total_len);
|
2011-09-18 15:19:35 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
/* queue all fragments atomically */
|
|
|
|
spin_lock_irqsave(&ndev->tx_q.lock, flags);
|
|
|
|
|
|
|
|
while ((skb_frag = __skb_dequeue(&frags_q)) != NULL)
|
|
|
|
__skb_queue_tail(&ndev->tx_q, skb_frag);
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&ndev->tx_q.lock, flags);
|
|
|
|
|
|
|
|
/* free the original skb */
|
|
|
|
kfree_skb(skb);
|
|
|
|
|
|
|
|
goto exit;
|
|
|
|
|
|
|
|
free_exit:
|
|
|
|
while ((skb_frag = __skb_dequeue(&frags_q)) != NULL)
|
|
|
|
kfree_skb(skb_frag);
|
|
|
|
|
|
|
|
exit:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Send NCI data */
|
|
|
|
int nci_send_data(struct nci_dev *ndev, __u8 conn_id, struct sk_buff *skb)
|
|
|
|
{
|
2015-02-02 04:26:08 +07:00
|
|
|
struct nci_conn_info *conn_info;
|
2011-09-18 15:19:35 +07:00
|
|
|
int rc = 0;
|
|
|
|
|
2011-11-30 02:37:35 +07:00
|
|
|
pr_debug("conn_id 0x%x, plen %d\n", conn_id, skb->len);
|
2011-09-18 15:19:35 +07:00
|
|
|
|
2015-02-02 04:26:08 +07:00
|
|
|
conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
|
|
|
|
if (!conn_info) {
|
|
|
|
rc = -EPROTO;
|
|
|
|
goto free_exit;
|
|
|
|
}
|
|
|
|
|
2011-09-18 15:19:35 +07:00
|
|
|
/* check if the packet need to be fragmented */
|
2015-02-02 04:26:08 +07:00
|
|
|
if (skb->len <= conn_info->max_pkt_payload_len) {
|
2011-09-18 15:19:35 +07:00
|
|
|
/* no need to fragment packet */
|
|
|
|
nci_push_data_hdr(ndev, conn_id, skb, NCI_PBF_LAST);
|
|
|
|
|
|
|
|
skb_queue_tail(&ndev->tx_q, skb);
|
|
|
|
} else {
|
|
|
|
/* fragment packet and queue the fragments */
|
|
|
|
rc = nci_queue_tx_data_frags(ndev, conn_id, skb);
|
|
|
|
if (rc) {
|
2011-11-30 02:37:32 +07:00
|
|
|
pr_err("failed to fragment tx data packet\n");
|
2011-09-18 15:19:35 +07:00
|
|
|
goto free_exit;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-02-02 04:26:08 +07:00
|
|
|
ndev->cur_conn_id = conn_id;
|
2011-09-18 15:19:35 +07:00
|
|
|
queue_work(ndev->tx_wq, &ndev->tx_work);
|
|
|
|
|
|
|
|
goto exit;
|
|
|
|
|
|
|
|
free_exit:
|
|
|
|
kfree_skb(skb);
|
|
|
|
|
|
|
|
exit:
|
|
|
|
return rc;
|
|
|
|
}
|
2015-10-22 16:11:33 +07:00
|
|
|
EXPORT_SYMBOL(nci_send_data);
|
2011-09-18 15:19:35 +07:00
|
|
|
|
|
|
|
/* ----------------- NCI RX Data ----------------- */
|
|
|
|
|
|
|
|
static void nci_add_rx_data_frag(struct nci_dev *ndev,
|
2012-03-05 07:03:54 +07:00
|
|
|
struct sk_buff *skb,
|
2015-02-02 04:26:08 +07:00
|
|
|
__u8 pbf, __u8 conn_id, __u8 status)
|
2011-09-18 15:19:35 +07:00
|
|
|
{
|
|
|
|
int reassembly_len;
|
|
|
|
int err = 0;
|
|
|
|
|
2014-12-03 03:27:47 +07:00
|
|
|
if (status) {
|
|
|
|
err = status;
|
|
|
|
goto exit;
|
|
|
|
}
|
|
|
|
|
2011-09-18 15:19:35 +07:00
|
|
|
if (ndev->rx_data_reassembly) {
|
|
|
|
reassembly_len = ndev->rx_data_reassembly->len;
|
|
|
|
|
|
|
|
/* first, make enough room for the already accumulated data */
|
|
|
|
if (skb_cow_head(skb, reassembly_len)) {
|
2011-11-30 02:37:32 +07:00
|
|
|
pr_err("error adding room for accumulated rx data\n");
|
2011-09-18 15:19:35 +07:00
|
|
|
|
|
|
|
kfree_skb(skb);
|
2012-05-07 17:31:24 +07:00
|
|
|
skb = NULL;
|
2011-09-18 15:19:35 +07:00
|
|
|
|
|
|
|
kfree_skb(ndev->rx_data_reassembly);
|
2012-05-07 17:31:24 +07:00
|
|
|
ndev->rx_data_reassembly = NULL;
|
2011-09-18 15:19:35 +07:00
|
|
|
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* second, combine the two fragments */
|
|
|
|
memcpy(skb_push(skb, reassembly_len),
|
2012-03-05 07:03:54 +07:00
|
|
|
ndev->rx_data_reassembly->data,
|
|
|
|
reassembly_len);
|
2011-09-18 15:19:35 +07:00
|
|
|
|
|
|
|
/* third, free old reassembly */
|
|
|
|
kfree_skb(ndev->rx_data_reassembly);
|
2012-05-07 17:31:24 +07:00
|
|
|
ndev->rx_data_reassembly = NULL;
|
2011-09-18 15:19:35 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
if (pbf == NCI_PBF_CONT) {
|
|
|
|
/* need to wait for next fragment, store skb and exit */
|
|
|
|
ndev->rx_data_reassembly = skb;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
exit:
|
2015-02-02 04:26:08 +07:00
|
|
|
if (ndev->nfc_dev->rf_mode == NFC_RF_TARGET) {
|
2014-10-21 21:52:49 +07:00
|
|
|
/* Data received in Target mode, forward to nfc core */
|
|
|
|
err = nfc_tm_data_received(ndev->nfc_dev, skb);
|
|
|
|
if (err)
|
|
|
|
pr_err("unable to handle received data\n");
|
|
|
|
} else {
|
2015-02-02 04:26:08 +07:00
|
|
|
nci_data_exchange_complete(ndev, skb, conn_id, err);
|
2014-10-21 21:52:49 +07:00
|
|
|
}
|
2011-09-18 15:19:35 +07:00
|
|
|
}
|
|
|
|
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/* Rx Data packet */
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void nci_rx_data_packet(struct nci_dev *ndev, struct sk_buff *skb)
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{
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__u8 pbf = nci_pbf(skb->data);
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2014-12-03 03:27:47 +07:00
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__u8 status = 0;
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2015-02-02 04:26:08 +07:00
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__u8 conn_id = nci_conn_id(skb->data);
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struct nci_conn_info *conn_info;
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2011-09-18 15:19:35 +07:00
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2011-11-30 02:37:35 +07:00
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pr_debug("len %d\n", skb->len);
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2011-09-18 15:19:35 +07:00
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2011-11-30 02:37:33 +07:00
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pr_debug("NCI RX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
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nci_pbf(skb->data),
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nci_conn_id(skb->data),
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nci_plen(skb->data));
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2011-09-18 15:19:35 +07:00
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2015-02-02 04:26:08 +07:00
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conn_info = nci_get_conn_info_by_conn_id(ndev, nci_conn_id(skb->data));
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if (!conn_info)
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return;
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2011-09-18 15:19:35 +07:00
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/* strip the nci data header */
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skb_pull(skb, NCI_DATA_HDR_SIZE);
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2014-07-23 00:48:40 +07:00
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if (ndev->target_active_prot == NFC_PROTO_MIFARE ||
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ndev->target_active_prot == NFC_PROTO_JEWEL ||
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ndev->target_active_prot == NFC_PROTO_FELICA ||
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ndev->target_active_prot == NFC_PROTO_ISO15693) {
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2011-09-18 15:19:35 +07:00
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/* frame I/F => remove the status byte */
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2014-07-23 00:48:40 +07:00
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pr_debug("frame I/F => remove the status byte\n");
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2014-12-03 03:27:47 +07:00
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status = skb->data[skb->len - 1];
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2011-09-18 15:19:35 +07:00
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skb_trim(skb, (skb->len - 1));
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}
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2015-02-02 04:26:08 +07:00
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nci_add_rx_data_frag(ndev, skb, pbf, conn_id, nci_to_errno(status));
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2011-09-18 15:19:35 +07:00
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}
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