/* * NFC Digital Protocol stack * Copyright (c) 2013, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope 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. * */ #define pr_fmt(fmt) "digital: %s: " fmt, __func__ #include "digital.h" #define DIGITAL_CMD_SENS_REQ 0x26 #define DIGITAL_CMD_ALL_REQ 0x52 #define DIGITAL_CMD_SEL_REQ_CL1 0x93 #define DIGITAL_CMD_SEL_REQ_CL2 0x95 #define DIGITAL_CMD_SEL_REQ_CL3 0x97 #define DIGITAL_SDD_REQ_SEL_PAR 0x20 #define DIGITAL_SDD_RES_CT 0x88 #define DIGITAL_SDD_RES_LEN 5 #define DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res) (!((sel_res) & 0x04)) #define DIGITAL_SEL_RES_IS_T2T(sel_res) (!((sel_res) & 0x60)) #define DIGITAL_SEL_RES_IS_NFC_DEP(sel_res) ((sel_res) & 0x40) #define DIGITAL_SENS_RES_IS_T1T(sens_res) (((sens_res) & 0x000C) == 0x000C) #define DIGITAL_SENS_RES_IS_VALID(sens_res) \ ((!((sens_res) & 0x1F00) && (((sens_res) & 0x000C) == 0x000C)) || \ (((sens_res) & 0x1F00) && ((sens_res) & 0x000C) != 0x000C)) #define DIGITAL_MIFARE_READ_RES_LEN 16 #define DIGITAL_MIFARE_ACK_RES 0x0A #define DIGITAL_CMD_SENSF_REQ 0x00 #define DIGITAL_CMD_SENSF_RES 0x01 #define DIGITAL_SENSF_RES_MIN_LENGTH 17 #define DIGITAL_SENSF_RES_RD_AP_B1 0x00 #define DIGITAL_SENSF_RES_RD_AP_B2 0x8F #define DIGITAL_SENSF_REQ_RC_NONE 0 #define DIGITAL_SENSF_REQ_RC_SC 1 #define DIGITAL_SENSF_REQ_RC_AP 2 struct digital_sdd_res { u8 nfcid1[4]; u8 bcc; } __packed; struct digital_sel_req { u8 sel_cmd; u8 b2; u8 nfcid1[4]; u8 bcc; } __packed; struct digital_sensf_req { u8 cmd; u8 sc1; u8 sc2; u8 rc; u8 tsn; } __packed; struct digital_sensf_res { u8 cmd; u8 nfcid2[8]; u8 pad0[2]; u8 pad1[3]; u8 mrti_check; u8 mrti_update; u8 pad2; u8 rd[2]; } __packed; static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev, struct nfc_target *target); static void digital_in_recv_sel_res(struct nfc_digital_dev *ddev, void *arg, struct sk_buff *resp) { struct nfc_target *target = arg; int rc; u8 sel_res; u8 nfc_proto; if (IS_ERR(resp)) { rc = PTR_ERR(resp); resp = NULL; goto exit; } if (!DIGITAL_DRV_CAPS_IN_CRC(ddev)) { rc = digital_skb_check_crc_a(resp); if (rc) { PROTOCOL_ERR("4.4.1.3"); goto exit; } } if (!resp->len) { rc = -EIO; goto exit; } sel_res = resp->data[0]; if (!DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res)) { rc = digital_in_send_sdd_req(ddev, target); if (rc) goto exit; goto exit_free_skb; } if (DIGITAL_SEL_RES_IS_T2T(sel_res)) { nfc_proto = NFC_PROTO_MIFARE; } else if (DIGITAL_SEL_RES_IS_NFC_DEP(sel_res)) { nfc_proto = NFC_PROTO_NFC_DEP; } else { rc = -EOPNOTSUPP; goto exit; } target->sel_res = sel_res; rc = digital_target_found(ddev, target, nfc_proto); exit: kfree(target); exit_free_skb: dev_kfree_skb(resp); if (rc) digital_poll_next_tech(ddev); } static int digital_in_send_sel_req(struct nfc_digital_dev *ddev, struct nfc_target *target, struct digital_sdd_res *sdd_res) { struct sk_buff *skb; struct digital_sel_req *sel_req; u8 sel_cmd; int rc; skb = digital_skb_alloc(ddev, sizeof(struct digital_sel_req)); if (!skb) return -ENOMEM; skb_put(skb, sizeof(struct digital_sel_req)); sel_req = (struct digital_sel_req *)skb->data; if (target->nfcid1_len <= 4) sel_cmd = DIGITAL_CMD_SEL_REQ_CL1; else if (target->nfcid1_len < 10) sel_cmd = DIGITAL_CMD_SEL_REQ_CL2; else sel_cmd = DIGITAL_CMD_SEL_REQ_CL3; sel_req->sel_cmd = sel_cmd; sel_req->b2 = 0x70; memcpy(sel_req->nfcid1, sdd_res->nfcid1, 4); sel_req->bcc = sdd_res->bcc; if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) { rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A); if (rc) goto exit; } else { digital_skb_add_crc_a(skb); } rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sel_res, target); exit: if (rc) kfree_skb(skb); return rc; } static void digital_in_recv_sdd_res(struct nfc_digital_dev *ddev, void *arg, struct sk_buff *resp) { struct nfc_target *target = arg; struct digital_sdd_res *sdd_res; int rc; u8 offset, size; u8 i, bcc; if (IS_ERR(resp)) { rc = PTR_ERR(resp); resp = NULL; goto exit; } if (resp->len < DIGITAL_SDD_RES_LEN) { PROTOCOL_ERR("4.7.2.8"); rc = -EINVAL; goto exit; } sdd_res = (struct digital_sdd_res *)resp->data; for (i = 0, bcc = 0; i < 4; i++) bcc ^= sdd_res->nfcid1[i]; if (bcc != sdd_res->bcc) { PROTOCOL_ERR("4.7.2.6"); rc = -EINVAL; goto exit; } if (sdd_res->nfcid1[0] == DIGITAL_SDD_RES_CT) { offset = 1; size = 3; } else { offset = 0; size = 4; } memcpy(target->nfcid1 + target->nfcid1_len, sdd_res->nfcid1 + offset, size); target->nfcid1_len += size; rc = digital_in_send_sel_req(ddev, target, sdd_res); exit: dev_kfree_skb(resp); if (rc) { kfree(target); digital_poll_next_tech(ddev); } } static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev, struct nfc_target *target) { int rc; struct sk_buff *skb; u8 sel_cmd; rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, NFC_DIGITAL_FRAMING_NFCA_STANDARD); if (rc) return rc; skb = digital_skb_alloc(ddev, 2); if (!skb) return -ENOMEM; if (target->nfcid1_len == 0) sel_cmd = DIGITAL_CMD_SEL_REQ_CL1; else if (target->nfcid1_len == 3) sel_cmd = DIGITAL_CMD_SEL_REQ_CL2; else sel_cmd = DIGITAL_CMD_SEL_REQ_CL3; *skb_put(skb, sizeof(u8)) = sel_cmd; *skb_put(skb, sizeof(u8)) = DIGITAL_SDD_REQ_SEL_PAR; return digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sdd_res, target); } static void digital_in_recv_sens_res(struct nfc_digital_dev *ddev, void *arg, struct sk_buff *resp) { struct nfc_target *target = NULL; u16 sens_res; int rc; if (IS_ERR(resp)) { rc = PTR_ERR(resp); resp = NULL; goto exit; } if (resp->len < sizeof(u16)) { rc = -EIO; goto exit; } target = kzalloc(sizeof(struct nfc_target), GFP_KERNEL); if (!target) { rc = -ENOMEM; goto exit; } memcpy(&target->sens_res, resp->data, sizeof(u16)); sens_res = be16_to_cpu(target->sens_res); if (!DIGITAL_SENS_RES_IS_VALID(sens_res)) { PROTOCOL_ERR("4.6.3.3"); rc = -EINVAL; goto exit; } if (DIGITAL_SENS_RES_IS_T1T(sens_res)) rc = digital_target_found(ddev, target, NFC_PROTO_JEWEL); else rc = digital_in_send_sdd_req(ddev, target); exit: dev_kfree_skb(resp); if (rc) { kfree(target); digital_poll_next_tech(ddev); } } int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech) { struct sk_buff *skb; int rc; rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, NFC_DIGITAL_RF_TECH_106A); if (rc) return rc; rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, NFC_DIGITAL_FRAMING_NFCA_SHORT); if (rc) return rc; skb = digital_skb_alloc(ddev, 1); if (!skb) return -ENOMEM; *skb_put(skb, sizeof(u8)) = DIGITAL_CMD_SENS_REQ; rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sens_res, NULL); if (rc) kfree_skb(skb); return rc; } int digital_in_recv_mifare_res(struct sk_buff *resp) { /* Successful READ command response is 16 data bytes + 2 CRC bytes long. * Since the driver can't differentiate a ACK/NACK response from a valid * READ response, the CRC calculation must be handled at digital level * even if the driver supports it for this technology. */ if (resp->len == DIGITAL_MIFARE_READ_RES_LEN + DIGITAL_CRC_LEN) { if (digital_skb_check_crc_a(resp)) { PROTOCOL_ERR("9.4.1.2"); return -EIO; } return 0; } /* ACK response (i.e. successful WRITE). */ if (resp->len == 1 && resp->data[0] == DIGITAL_MIFARE_ACK_RES) { resp->data[0] = 0; return 0; } /* NACK and any other responses are treated as error. */ return -EIO; } static void digital_in_recv_sensf_res(struct nfc_digital_dev *ddev, void *arg, struct sk_buff *resp) { int rc; u8 proto; struct nfc_target target; struct digital_sensf_res *sensf_res; if (IS_ERR(resp)) { rc = PTR_ERR(resp); resp = NULL; goto exit; } if (resp->len < DIGITAL_SENSF_RES_MIN_LENGTH) { rc = -EIO; goto exit; } if (!DIGITAL_DRV_CAPS_IN_CRC(ddev)) { rc = digital_skb_check_crc_f(resp); if (rc) { PROTOCOL_ERR("6.4.1.8"); goto exit; } } skb_pull(resp, 1); memset(&target, 0, sizeof(struct nfc_target)); sensf_res = (struct digital_sensf_res *)resp->data; memcpy(target.sensf_res, sensf_res, resp->len); target.sensf_res_len = resp->len; memcpy(target.nfcid2, sensf_res->nfcid2, NFC_NFCID2_MAXSIZE); target.nfcid2_len = NFC_NFCID2_MAXSIZE; if (target.nfcid2[0] == DIGITAL_SENSF_NFCID2_NFC_DEP_B1 && target.nfcid2[1] == DIGITAL_SENSF_NFCID2_NFC_DEP_B2) proto = NFC_PROTO_NFC_DEP; else proto = NFC_PROTO_FELICA; rc = digital_target_found(ddev, &target, proto); exit: dev_kfree_skb(resp); if (rc) digital_poll_next_tech(ddev); } int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech) { struct digital_sensf_req *sensf_req; struct sk_buff *skb; int rc; u8 size; rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech); if (rc) return rc; rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, NFC_DIGITAL_FRAMING_NFCF); if (rc) return rc; size = sizeof(struct digital_sensf_req); skb = digital_skb_alloc(ddev, size); if (!skb) return -ENOMEM; skb_put(skb, size); sensf_req = (struct digital_sensf_req *)skb->data; sensf_req->cmd = DIGITAL_CMD_SENSF_REQ; sensf_req->sc1 = 0xFF; sensf_req->sc2 = 0xFF; sensf_req->rc = 0; sensf_req->tsn = 0; *skb_push(skb, 1) = size + 1; if (!DIGITAL_DRV_CAPS_IN_CRC(ddev)) digital_skb_add_crc_f(skb); rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sensf_res, NULL); if (rc) kfree_skb(skb); return rc; } static int digital_tg_send_sel_res(struct nfc_digital_dev *ddev) { struct sk_buff *skb; int rc; skb = digital_skb_alloc(ddev, 1); if (!skb) return -ENOMEM; *skb_put(skb, 1) = DIGITAL_SEL_RES_NFC_DEP; if (!DIGITAL_DRV_CAPS_TG_CRC(ddev)) digital_skb_add_crc_a(skb); rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_atr_req, NULL); if (rc) kfree_skb(skb); return rc; } static void digital_tg_recv_sel_req(struct nfc_digital_dev *ddev, void *arg, struct sk_buff *resp) { int rc; if (IS_ERR(resp)) { rc = PTR_ERR(resp); resp = NULL; goto exit; } if (!DIGITAL_DRV_CAPS_TG_CRC(ddev)) { rc = digital_skb_check_crc_a(resp); if (rc) { PROTOCOL_ERR("4.4.1.3"); goto exit; } } /* Silently ignore SEL_REQ content and send a SEL_RES for NFC-DEP */ rc = digital_tg_send_sel_res(ddev); exit: if (rc) digital_poll_next_tech(ddev); dev_kfree_skb(resp); } static int digital_tg_send_sdd_res(struct nfc_digital_dev *ddev) { struct sk_buff *skb; struct digital_sdd_res *sdd_res; int rc, i; skb = digital_skb_alloc(ddev, sizeof(struct digital_sdd_res)); if (!skb) return -ENOMEM; skb_put(skb, sizeof(struct digital_sdd_res)); sdd_res = (struct digital_sdd_res *)skb->data; sdd_res->nfcid1[0] = 0x08; get_random_bytes(sdd_res->nfcid1 + 1, 3); sdd_res->bcc = 0; for (i = 0; i < 4; i++) sdd_res->bcc ^= sdd_res->nfcid1[i]; rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_sel_req, NULL); if (rc) kfree_skb(skb); return rc; } static void digital_tg_recv_sdd_req(struct nfc_digital_dev *ddev, void *arg, struct sk_buff *resp) { u8 *sdd_req; int rc; if (IS_ERR(resp)) { rc = PTR_ERR(resp); resp = NULL; goto exit; } sdd_req = resp->data; if (resp->len < 2 || sdd_req[0] != DIGITAL_CMD_SEL_REQ_CL1 || sdd_req[1] != DIGITAL_SDD_REQ_SEL_PAR) { rc = -EINVAL; goto exit; } rc = digital_tg_send_sdd_res(ddev); exit: if (rc) digital_poll_next_tech(ddev); dev_kfree_skb(resp); } static int digital_tg_send_sens_res(struct nfc_digital_dev *ddev) { struct sk_buff *skb; u8 *sens_res; int rc; skb = digital_skb_alloc(ddev, 2); if (!skb) return -ENOMEM; sens_res = skb_put(skb, 2); sens_res[0] = (DIGITAL_SENS_RES_NFC_DEP >> 8) & 0xFF; sens_res[1] = DIGITAL_SENS_RES_NFC_DEP & 0xFF; rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_sdd_req, NULL); if (rc) kfree_skb(skb); return rc; } void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg, struct sk_buff *resp) { u8 sens_req; int rc; if (IS_ERR(resp)) { rc = PTR_ERR(resp); resp = NULL; goto exit; } sens_req = resp->data[0]; if (!resp->len || (sens_req != DIGITAL_CMD_SENS_REQ && sens_req != DIGITAL_CMD_ALL_REQ)) { rc = -EINVAL; goto exit; } rc = digital_tg_send_sens_res(ddev); exit: if (rc) digital_poll_next_tech(ddev); dev_kfree_skb(resp); } static int digital_tg_send_sensf_res(struct nfc_digital_dev *ddev, struct digital_sensf_req *sensf_req) { struct sk_buff *skb; u8 size; int rc; struct digital_sensf_res *sensf_res; size = sizeof(struct digital_sensf_res); if (sensf_req->rc != DIGITAL_SENSF_REQ_RC_NONE) size -= sizeof(sensf_res->rd); skb = digital_skb_alloc(ddev, size); if (!skb) return -ENOMEM; skb_put(skb, size); sensf_res = (struct digital_sensf_res *)skb->data; memset(sensf_res, 0, size); sensf_res->cmd = DIGITAL_CMD_SENSF_RES; sensf_res->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1; sensf_res->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2; get_random_bytes(&sensf_res->nfcid2[2], 6); switch (sensf_req->rc) { case DIGITAL_SENSF_REQ_RC_SC: sensf_res->rd[0] = sensf_req->sc1; sensf_res->rd[1] = sensf_req->sc2; break; case DIGITAL_SENSF_REQ_RC_AP: sensf_res->rd[0] = DIGITAL_SENSF_RES_RD_AP_B1; sensf_res->rd[1] = DIGITAL_SENSF_RES_RD_AP_B2; break; } *skb_push(skb, sizeof(u8)) = size + 1; if (!DIGITAL_DRV_CAPS_TG_CRC(ddev)) digital_skb_add_crc_f(skb); rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_atr_req, NULL); if (rc) kfree_skb(skb); return rc; } void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg, struct sk_buff *resp) { struct digital_sensf_req *sensf_req; int rc; if (IS_ERR(resp)) { rc = PTR_ERR(resp); resp = NULL; goto exit; } if (!DIGITAL_DRV_CAPS_TG_CRC(ddev)) { rc = digital_skb_check_crc_f(resp); if (rc) { PROTOCOL_ERR("6.4.1.8"); goto exit; } } if (resp->len != sizeof(struct digital_sensf_req) + 1) { rc = -EINVAL; goto exit; } skb_pull(resp, 1); sensf_req = (struct digital_sensf_req *)resp->data; if (sensf_req->cmd != DIGITAL_CMD_SENSF_REQ) { rc = -EINVAL; goto exit; } rc = digital_tg_send_sensf_res(ddev, sensf_req); exit: if (rc) digital_poll_next_tech(ddev); dev_kfree_skb(resp); } int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech) { int rc; rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech); if (rc) return rc; rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, NFC_DIGITAL_FRAMING_NFCA_NFC_DEP); if (rc) return rc; return digital_tg_listen(ddev, 300, digital_tg_recv_sens_req, NULL); } int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech) { int rc; u8 *nfcid2; rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech); if (rc) return rc; rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, NFC_DIGITAL_FRAMING_NFCF_NFC_DEP); if (rc) return rc; nfcid2 = kzalloc(NFC_NFCID2_MAXSIZE, GFP_KERNEL); if (!nfcid2) return -ENOMEM; nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1; nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2; get_random_bytes(nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2); return digital_tg_listen(ddev, 300, digital_tg_recv_sensf_req, nfcid2); }