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![Samuel Ortiz](/assets/img/avatar_default.png)
We do not add the newline to the pr_fmt macro, in order to give more flexibility to the caller and to keep the logging style consistent with the rest of the NFC and kernel code. Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
729 lines
15 KiB
C
729 lines
15 KiB
C
/*
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* NFC Digital Protocol stack
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* Copyright (c) 2013, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#define pr_fmt(fmt) "digital: %s: " fmt, __func__
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#include "digital.h"
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#define DIGITAL_NFC_DEP_FRAME_DIR_OUT 0xD4
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#define DIGITAL_NFC_DEP_FRAME_DIR_IN 0xD5
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#define DIGITAL_NFC_DEP_NFCA_SOD_SB 0xF0
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#define DIGITAL_CMD_ATR_REQ 0x00
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#define DIGITAL_CMD_ATR_RES 0x01
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#define DIGITAL_CMD_PSL_REQ 0x04
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#define DIGITAL_CMD_PSL_RES 0x05
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#define DIGITAL_CMD_DEP_REQ 0x06
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#define DIGITAL_CMD_DEP_RES 0x07
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#define DIGITAL_ATR_REQ_MIN_SIZE 16
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#define DIGITAL_ATR_REQ_MAX_SIZE 64
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#define DIGITAL_NFCID3_LEN ((u8)8)
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#define DIGITAL_LR_BITS_PAYLOAD_SIZE_254B 0x30
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#define DIGITAL_GB_BIT 0x02
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#define DIGITAL_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0)
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#define DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT 0x10
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#define DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
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((pfb) & DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT)
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#define DIGITAL_NFC_DEP_MI_BIT_SET(pfb) ((pfb) & 0x10)
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#define DIGITAL_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08)
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#define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & 0x04)
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#define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03)
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#define DIGITAL_NFC_DEP_PFB_I_PDU 0x00
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#define DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU 0x40
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#define DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU 0x80
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struct digital_atr_req {
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u8 dir;
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u8 cmd;
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u8 nfcid3[10];
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u8 did;
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u8 bs;
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u8 br;
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u8 pp;
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u8 gb[0];
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} __packed;
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struct digital_atr_res {
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u8 dir;
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u8 cmd;
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u8 nfcid3[10];
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u8 did;
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u8 bs;
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u8 br;
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u8 to;
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u8 pp;
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u8 gb[0];
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} __packed;
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struct digital_psl_req {
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u8 dir;
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u8 cmd;
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u8 did;
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u8 brs;
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u8 fsl;
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} __packed;
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struct digital_psl_res {
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u8 dir;
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u8 cmd;
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u8 did;
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} __packed;
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struct digital_dep_req_res {
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u8 dir;
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u8 cmd;
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u8 pfb;
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} __packed;
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static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg,
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struct sk_buff *resp);
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static void digital_skb_push_dep_sod(struct nfc_digital_dev *ddev,
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struct sk_buff *skb)
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{
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skb_push(skb, sizeof(u8));
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skb->data[0] = skb->len;
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if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)
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*skb_push(skb, sizeof(u8)) = DIGITAL_NFC_DEP_NFCA_SOD_SB;
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}
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static int digital_skb_pull_dep_sod(struct nfc_digital_dev *ddev,
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struct sk_buff *skb)
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{
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u8 size;
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if (skb->len < 2)
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return -EIO;
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if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)
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skb_pull(skb, sizeof(u8));
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size = skb->data[0];
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if (size != skb->len)
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return -EIO;
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skb_pull(skb, sizeof(u8));
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return 0;
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}
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static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg,
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struct sk_buff *resp)
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{
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struct nfc_target *target = arg;
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struct digital_atr_res *atr_res;
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u8 gb_len;
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int rc;
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if (IS_ERR(resp)) {
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rc = PTR_ERR(resp);
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resp = NULL;
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goto exit;
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}
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rc = ddev->skb_check_crc(resp);
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if (rc) {
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PROTOCOL_ERR("14.4.1.6");
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goto exit;
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}
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rc = digital_skb_pull_dep_sod(ddev, resp);
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if (rc) {
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PROTOCOL_ERR("14.4.1.2");
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goto exit;
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}
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if (resp->len < sizeof(struct digital_atr_res)) {
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rc = -EIO;
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goto exit;
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}
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gb_len = resp->len - sizeof(struct digital_atr_res);
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atr_res = (struct digital_atr_res *)resp->data;
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rc = nfc_set_remote_general_bytes(ddev->nfc_dev, atr_res->gb, gb_len);
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if (rc)
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goto exit;
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rc = nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE,
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NFC_RF_INITIATOR);
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ddev->curr_nfc_dep_pni = 0;
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exit:
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dev_kfree_skb(resp);
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if (rc)
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ddev->curr_protocol = 0;
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}
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int digital_in_send_atr_req(struct nfc_digital_dev *ddev,
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struct nfc_target *target, __u8 comm_mode, __u8 *gb,
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size_t gb_len)
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{
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struct sk_buff *skb;
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struct digital_atr_req *atr_req;
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uint size;
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size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len;
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if (size > DIGITAL_ATR_REQ_MAX_SIZE) {
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PROTOCOL_ERR("14.6.1.1");
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return -EINVAL;
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}
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skb = digital_skb_alloc(ddev, size);
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if (!skb)
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return -ENOMEM;
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skb_put(skb, sizeof(struct digital_atr_req));
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atr_req = (struct digital_atr_req *)skb->data;
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memset(atr_req, 0, sizeof(struct digital_atr_req));
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atr_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
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atr_req->cmd = DIGITAL_CMD_ATR_REQ;
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if (target->nfcid2_len)
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memcpy(atr_req->nfcid3, target->nfcid2,
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max(target->nfcid2_len, DIGITAL_NFCID3_LEN));
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else
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get_random_bytes(atr_req->nfcid3, DIGITAL_NFCID3_LEN);
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atr_req->did = 0;
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atr_req->bs = 0;
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atr_req->br = 0;
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atr_req->pp = DIGITAL_LR_BITS_PAYLOAD_SIZE_254B;
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if (gb_len) {
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atr_req->pp |= DIGITAL_GB_BIT;
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memcpy(skb_put(skb, gb_len), gb, gb_len);
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}
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digital_skb_push_dep_sod(ddev, skb);
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ddev->skb_add_crc(skb);
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digital_in_send_cmd(ddev, skb, 500, digital_in_recv_atr_res, target);
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return 0;
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}
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static int digital_in_send_rtox(struct nfc_digital_dev *ddev,
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struct digital_data_exch *data_exch, u8 rtox)
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{
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struct digital_dep_req_res *dep_req;
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struct sk_buff *skb;
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int rc;
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skb = digital_skb_alloc(ddev, 1);
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if (!skb)
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return -ENOMEM;
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*skb_put(skb, 1) = rtox;
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skb_push(skb, sizeof(struct digital_dep_req_res));
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dep_req = (struct digital_dep_req_res *)skb->data;
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dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
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dep_req->cmd = DIGITAL_CMD_DEP_REQ;
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dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU |
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DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT;
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digital_skb_push_dep_sod(ddev, skb);
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ddev->skb_add_crc(skb);
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rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res,
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data_exch);
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return rc;
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}
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static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg,
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struct sk_buff *resp)
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{
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struct digital_data_exch *data_exch = arg;
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struct digital_dep_req_res *dep_res;
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u8 pfb;
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uint size;
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int rc;
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if (IS_ERR(resp)) {
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rc = PTR_ERR(resp);
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resp = NULL;
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goto exit;
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}
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rc = ddev->skb_check_crc(resp);
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if (rc) {
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PROTOCOL_ERR("14.4.1.6");
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goto error;
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}
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rc = digital_skb_pull_dep_sod(ddev, resp);
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if (rc) {
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PROTOCOL_ERR("14.4.1.2");
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goto exit;
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}
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dep_res = (struct digital_dep_req_res *)resp->data;
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if (resp->len < sizeof(struct digital_dep_req_res) ||
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dep_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN ||
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dep_res->cmd != DIGITAL_CMD_DEP_RES) {
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rc = -EIO;
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goto error;
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}
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pfb = dep_res->pfb;
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switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) {
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case DIGITAL_NFC_DEP_PFB_I_PDU:
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if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) {
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PROTOCOL_ERR("14.12.3.3");
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rc = -EIO;
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goto error;
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}
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ddev->curr_nfc_dep_pni =
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DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1);
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rc = 0;
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break;
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case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU:
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pr_err("Received a ACK/NACK PDU\n");
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rc = -EIO;
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goto error;
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case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU:
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if (!DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) {
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rc = -EINVAL;
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goto error;
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}
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rc = digital_in_send_rtox(ddev, data_exch, resp->data[3]);
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if (rc)
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goto error;
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kfree_skb(resp);
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return;
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}
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if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb)) {
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pr_err("MI bit set. Chained PDU not supported\n");
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rc = -EIO;
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goto error;
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}
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size = sizeof(struct digital_dep_req_res);
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if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb))
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size++;
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if (size > resp->len) {
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rc = -EIO;
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goto error;
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}
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skb_pull(resp, size);
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exit:
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data_exch->cb(data_exch->cb_context, resp, rc);
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error:
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kfree(data_exch);
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if (rc)
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kfree_skb(resp);
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}
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int digital_in_send_dep_req(struct nfc_digital_dev *ddev,
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struct nfc_target *target, struct sk_buff *skb,
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struct digital_data_exch *data_exch)
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{
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struct digital_dep_req_res *dep_req;
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skb_push(skb, sizeof(struct digital_dep_req_res));
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dep_req = (struct digital_dep_req_res *)skb->data;
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dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
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dep_req->cmd = DIGITAL_CMD_DEP_REQ;
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dep_req->pfb = ddev->curr_nfc_dep_pni;
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digital_skb_push_dep_sod(ddev, skb);
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ddev->skb_add_crc(skb);
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return digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res,
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data_exch);
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}
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static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg,
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struct sk_buff *resp)
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{
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int rc;
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struct digital_dep_req_res *dep_req;
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size_t size;
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if (IS_ERR(resp)) {
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rc = PTR_ERR(resp);
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resp = NULL;
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goto exit;
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}
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rc = ddev->skb_check_crc(resp);
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if (rc) {
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PROTOCOL_ERR("14.4.1.6");
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goto exit;
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}
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rc = digital_skb_pull_dep_sod(ddev, resp);
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if (rc) {
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PROTOCOL_ERR("14.4.1.2");
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goto exit;
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}
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size = sizeof(struct digital_dep_req_res);
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dep_req = (struct digital_dep_req_res *)resp->data;
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if (resp->len < size || dep_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT ||
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dep_req->cmd != DIGITAL_CMD_DEP_REQ) {
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rc = -EIO;
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goto exit;
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}
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if (DIGITAL_NFC_DEP_DID_BIT_SET(dep_req->pfb))
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size++;
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if (resp->len < size) {
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rc = -EIO;
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goto exit;
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}
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switch (DIGITAL_NFC_DEP_PFB_TYPE(dep_req->pfb)) {
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case DIGITAL_NFC_DEP_PFB_I_PDU:
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pr_debug("DIGITAL_NFC_DEP_PFB_I_PDU\n");
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ddev->curr_nfc_dep_pni = DIGITAL_NFC_DEP_PFB_PNI(dep_req->pfb);
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break;
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case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU:
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pr_err("Received a ACK/NACK PDU\n");
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rc = -EINVAL;
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goto exit;
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break;
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case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU:
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pr_err("Received a SUPERVISOR PDU\n");
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rc = -EINVAL;
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goto exit;
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break;
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}
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skb_pull(resp, size);
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rc = nfc_tm_data_received(ddev->nfc_dev, resp);
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exit:
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if (rc)
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kfree_skb(resp);
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}
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int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb)
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{
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struct digital_dep_req_res *dep_res;
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skb_push(skb, sizeof(struct digital_dep_req_res));
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dep_res = (struct digital_dep_req_res *)skb->data;
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dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN;
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dep_res->cmd = DIGITAL_CMD_DEP_RES;
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dep_res->pfb = ddev->curr_nfc_dep_pni;
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digital_skb_push_dep_sod(ddev, skb);
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ddev->skb_add_crc(skb);
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return digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req,
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NULL);
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}
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static void digital_tg_send_psl_res_complete(struct nfc_digital_dev *ddev,
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void *arg, struct sk_buff *resp)
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{
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u8 rf_tech = PTR_ERR(arg);
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if (IS_ERR(resp))
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return;
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digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech);
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digital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL);
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dev_kfree_skb(resp);
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}
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static int digital_tg_send_psl_res(struct nfc_digital_dev *ddev, u8 did,
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u8 rf_tech)
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{
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struct digital_psl_res *psl_res;
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struct sk_buff *skb;
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int rc;
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skb = digital_skb_alloc(ddev, sizeof(struct digital_psl_res));
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if (!skb)
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return -ENOMEM;
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skb_put(skb, sizeof(struct digital_psl_res));
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psl_res = (struct digital_psl_res *)skb->data;
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psl_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN;
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psl_res->cmd = DIGITAL_CMD_PSL_RES;
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psl_res->did = did;
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digital_skb_push_dep_sod(ddev, skb);
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ddev->skb_add_crc(skb);
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|
|
rc = digital_tg_send_cmd(ddev, skb, 0, digital_tg_send_psl_res_complete,
|
|
ERR_PTR(rf_tech));
|
|
|
|
if (rc)
|
|
kfree_skb(skb);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void digital_tg_recv_psl_req(struct nfc_digital_dev *ddev, void *arg,
|
|
struct sk_buff *resp)
|
|
{
|
|
int rc;
|
|
struct digital_psl_req *psl_req;
|
|
u8 rf_tech;
|
|
u8 dsi;
|
|
|
|
if (IS_ERR(resp)) {
|
|
rc = PTR_ERR(resp);
|
|
resp = NULL;
|
|
goto exit;
|
|
}
|
|
|
|
rc = ddev->skb_check_crc(resp);
|
|
if (rc) {
|
|
PROTOCOL_ERR("14.4.1.6");
|
|
goto exit;
|
|
}
|
|
|
|
rc = digital_skb_pull_dep_sod(ddev, resp);
|
|
if (rc) {
|
|
PROTOCOL_ERR("14.4.1.2");
|
|
goto exit;
|
|
}
|
|
|
|
psl_req = (struct digital_psl_req *)resp->data;
|
|
|
|
if (resp->len != sizeof(struct digital_psl_req) ||
|
|
psl_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT ||
|
|
psl_req->cmd != DIGITAL_CMD_PSL_REQ) {
|
|
rc = -EIO;
|
|
goto exit;
|
|
}
|
|
|
|
dsi = (psl_req->brs >> 3) & 0x07;
|
|
switch (dsi) {
|
|
case 0:
|
|
rf_tech = NFC_DIGITAL_RF_TECH_106A;
|
|
break;
|
|
case 1:
|
|
rf_tech = NFC_DIGITAL_RF_TECH_212F;
|
|
break;
|
|
case 2:
|
|
rf_tech = NFC_DIGITAL_RF_TECH_424F;
|
|
break;
|
|
default:
|
|
pr_err("Unsuported dsi value %d\n", dsi);
|
|
goto exit;
|
|
}
|
|
|
|
rc = digital_tg_send_psl_res(ddev, psl_req->did, rf_tech);
|
|
|
|
exit:
|
|
kfree_skb(resp);
|
|
}
|
|
|
|
static void digital_tg_send_atr_res_complete(struct nfc_digital_dev *ddev,
|
|
void *arg, struct sk_buff *resp)
|
|
{
|
|
int offset;
|
|
|
|
if (IS_ERR(resp)) {
|
|
digital_poll_next_tech(ddev);
|
|
return;
|
|
}
|
|
|
|
offset = 2;
|
|
if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB)
|
|
offset++;
|
|
|
|
if (resp->data[offset] == DIGITAL_CMD_PSL_REQ)
|
|
digital_tg_recv_psl_req(ddev, arg, resp);
|
|
else
|
|
digital_tg_recv_dep_req(ddev, arg, resp);
|
|
}
|
|
|
|
static int digital_tg_send_atr_res(struct nfc_digital_dev *ddev,
|
|
struct digital_atr_req *atr_req)
|
|
{
|
|
struct digital_atr_res *atr_res;
|
|
struct sk_buff *skb;
|
|
u8 *gb;
|
|
size_t gb_len;
|
|
int rc;
|
|
|
|
gb = nfc_get_local_general_bytes(ddev->nfc_dev, &gb_len);
|
|
if (!gb)
|
|
gb_len = 0;
|
|
|
|
skb = digital_skb_alloc(ddev, sizeof(struct digital_atr_res) + gb_len);
|
|
if (!skb)
|
|
return -ENOMEM;
|
|
|
|
skb_put(skb, sizeof(struct digital_atr_res));
|
|
atr_res = (struct digital_atr_res *)skb->data;
|
|
|
|
memset(atr_res, 0, sizeof(struct digital_atr_res));
|
|
|
|
atr_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN;
|
|
atr_res->cmd = DIGITAL_CMD_ATR_RES;
|
|
memcpy(atr_res->nfcid3, atr_req->nfcid3, sizeof(atr_req->nfcid3));
|
|
atr_res->to = 8;
|
|
atr_res->pp = DIGITAL_LR_BITS_PAYLOAD_SIZE_254B;
|
|
if (gb_len) {
|
|
skb_put(skb, gb_len);
|
|
|
|
atr_res->pp |= DIGITAL_GB_BIT;
|
|
memcpy(atr_res->gb, gb, gb_len);
|
|
}
|
|
|
|
digital_skb_push_dep_sod(ddev, skb);
|
|
|
|
ddev->skb_add_crc(skb);
|
|
|
|
rc = digital_tg_send_cmd(ddev, skb, 999,
|
|
digital_tg_send_atr_res_complete, NULL);
|
|
if (rc) {
|
|
kfree_skb(skb);
|
|
return rc;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg,
|
|
struct sk_buff *resp)
|
|
{
|
|
int rc;
|
|
struct digital_atr_req *atr_req;
|
|
size_t gb_len, min_size;
|
|
|
|
if (IS_ERR(resp)) {
|
|
rc = PTR_ERR(resp);
|
|
resp = NULL;
|
|
goto exit;
|
|
}
|
|
|
|
if (!resp->len) {
|
|
rc = -EIO;
|
|
goto exit;
|
|
}
|
|
|
|
if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) {
|
|
min_size = DIGITAL_ATR_REQ_MIN_SIZE + 2;
|
|
|
|
ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_106A;
|
|
ddev->skb_add_crc = digital_skb_add_crc_a;
|
|
ddev->skb_check_crc = digital_skb_check_crc_a;
|
|
} else {
|
|
min_size = DIGITAL_ATR_REQ_MIN_SIZE + 1;
|
|
|
|
ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_212F;
|
|
ddev->skb_add_crc = digital_skb_add_crc_f;
|
|
ddev->skb_check_crc = digital_skb_check_crc_f;
|
|
}
|
|
|
|
if (resp->len < min_size) {
|
|
rc = -EIO;
|
|
goto exit;
|
|
}
|
|
|
|
if (DIGITAL_DRV_CAPS_TG_CRC(ddev)) {
|
|
ddev->skb_add_crc = digital_skb_add_crc_none;
|
|
ddev->skb_check_crc = digital_skb_check_crc_none;
|
|
}
|
|
|
|
rc = ddev->skb_check_crc(resp);
|
|
if (rc) {
|
|
PROTOCOL_ERR("14.4.1.6");
|
|
goto exit;
|
|
}
|
|
|
|
rc = digital_skb_pull_dep_sod(ddev, resp);
|
|
if (rc) {
|
|
PROTOCOL_ERR("14.4.1.2");
|
|
goto exit;
|
|
}
|
|
|
|
atr_req = (struct digital_atr_req *)resp->data;
|
|
|
|
if (atr_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT ||
|
|
atr_req->cmd != DIGITAL_CMD_ATR_REQ) {
|
|
rc = -EINVAL;
|
|
goto exit;
|
|
}
|
|
|
|
rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
|
|
NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED);
|
|
if (rc)
|
|
goto exit;
|
|
|
|
rc = digital_tg_send_atr_res(ddev, atr_req);
|
|
if (rc)
|
|
goto exit;
|
|
|
|
gb_len = resp->len - sizeof(struct digital_atr_req);
|
|
rc = nfc_tm_activated(ddev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
|
|
NFC_COMM_PASSIVE, atr_req->gb, gb_len);
|
|
if (rc)
|
|
goto exit;
|
|
|
|
ddev->poll_tech_count = 0;
|
|
|
|
rc = 0;
|
|
exit:
|
|
if (rc)
|
|
digital_poll_next_tech(ddev);
|
|
|
|
dev_kfree_skb(resp);
|
|
}
|