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Commit 447b27c4 authored by Christophe Ricard's avatar Christophe Ricard Committed by Samuel Ortiz
Browse files

NFC: Forward NFC_EVT_TRANSACTION to user space 



NFC_EVT_TRANSACTION is sent through netlink in order for a
specific application running on a secure element to notify
userspace of an event. Typically the secure element application
counterpart on the host could interpret that event and act
upon it.

Forwarded information contains:
- SE host generating the event
- Application IDentifier doing the operation
- Applications parameters

Signed-off-by: default avatarChristophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 8ae01f79

include/net/nfc/nfc.h

+27 −0
Original line number Diff line number Diff line
@@ -135,6 +135,31 @@ struct nfc_se { 
	u16 state;

};



/**

 * nfc_evt_transaction - A struct for NFC secure element event transaction.

 *

 * @aid: The application identifier triggering the event

 *

 * @aid_len: The application identifier length [5:16]

 *

 * @params: The application parameters transmitted during the transaction

 *

 * @params_len: The applications parameters length [0:255]

 *

 */

#define NFC_MIN_AID_LENGTH	5

#define	NFC_MAX_AID_LENGTH	16

#define NFC_MAX_PARAMS_LENGTH	255



#define NFC_EVT_TRANSACTION_AID_TAG	0x81

#define NFC_EVT_TRANSACTION_PARAMS_TAG	0x82

struct nfc_evt_transaction {

	u32 aid_len;

	u8 aid[NFC_MAX_AID_LENGTH];

	u8 params_len;

	u8 params[NFC_MAX_PARAMS_LENGTH];

} __packed;



struct nfc_genl_data {

	u32 poll_req_portid;

	struct mutex genl_data_mutex;
@@ -262,6 +287,8 @@ int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb); 


void nfc_driver_failure(struct nfc_dev *dev, int err);



int nfc_se_transaction(struct nfc_dev *dev, u8 se_idx,

		       struct nfc_evt_transaction *evt_transaction);

int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type);

int nfc_remove_se(struct nfc_dev *dev, u32 se_idx);

struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx);

include/uapi/linux/nfc.h

+1 −0
Original line number Diff line number Diff line
@@ -183,6 +183,7 @@ enum nfc_attrs { 
	NFC_ATTR_SE_APDU,

	NFC_ATTR_TARGET_ISO15693_DSFID,

	NFC_ATTR_TARGET_ISO15693_UID,

	NFC_ATTR_SE_PARAMS,

/* private: internal use only */

	__NFC_ATTR_AFTER_LAST

};

net/nfc/core.c

+21 −0
Original line number Diff line number Diff line
@@ -932,6 +932,27 @@ int nfc_remove_se(struct nfc_dev *dev, u32 se_idx) 
}

EXPORT_SYMBOL(nfc_remove_se);



int nfc_se_transaction(struct nfc_dev *dev, u8 se_idx,

		       struct nfc_evt_transaction *evt_transaction)

{

	int rc;



	pr_debug("transaction: %x\n", se_idx);



	device_lock(&dev->dev);



	if (!evt_transaction) {

		rc = -EPROTO;

		goto out;

	}



	rc = nfc_genl_se_transaction(dev, se_idx, evt_transaction);

out:

	device_unlock(&dev->dev);

	return rc;

}

EXPORT_SYMBOL(nfc_se_transaction);



static void nfc_release(struct device *d)

{

	struct nfc_dev *dev = to_nfc_dev(d);

net/nfc/netlink.c

+47 −0
Original line number Diff line number Diff line
@@ -497,6 +497,53 @@ int nfc_genl_se_removed(struct nfc_dev *dev, u32 se_idx) 
	return -EMSGSIZE;

}



int nfc_genl_se_transaction(struct nfc_dev *dev, u8 se_idx,

			    struct nfc_evt_transaction *evt_transaction)

{

	struct nfc_se *se;

	struct sk_buff *msg;

	void *hdr;



	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);

	if (!msg)

		return -ENOMEM;



	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,

			  NFC_EVENT_SE_TRANSACTION);

	if (!hdr)

		goto free_msg;



	se = nfc_find_se(dev, se_idx);

	if (!se)

		goto free_msg;



	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||

	    nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||

	    nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type) ||

	    nla_put(msg, NFC_ATTR_SE_AID, evt_transaction->aid_len,

		    evt_transaction->aid) ||

	    nla_put(msg, NFC_ATTR_SE_PARAMS, evt_transaction->params_len,

		    evt_transaction->params))

		goto nla_put_failure;



	/* evt_transaction is no more used */

	devm_kfree(&dev->dev, evt_transaction);



	genlmsg_end(msg, hdr);



	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);



	return 0;



nla_put_failure:

	genlmsg_cancel(msg, hdr);

free_msg:

	/* evt_transaction is no more used */

	devm_kfree(&dev->dev, evt_transaction);

	nlmsg_free(msg);

	return -EMSGSIZE;

}



static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,

				u32 portid, u32 seq,

				struct netlink_callback *cb,

net/nfc/nfc.h

+2 −0
Original line number Diff line number Diff line
@@ -100,6 +100,8 @@ int nfc_genl_llc_send_sdres(struct nfc_dev *dev, struct hlist_head *sdres_list); 


int nfc_genl_se_added(struct nfc_dev *dev, u32 se_idx, u16 type);

int nfc_genl_se_removed(struct nfc_dev *dev, u32 se_idx);

int nfc_genl_se_transaction(struct nfc_dev *dev, u8 se_idx,

			    struct nfc_evt_transaction *evt_transaction);



struct nfc_dev *nfc_get_device(unsigned int idx);