diff options
Diffstat (limited to 'net/nfc')
| -rw-r--r-- | net/nfc/Kconfig | 14 | ||||
| -rw-r--r-- | net/nfc/Makefile | 2 | ||||
| -rw-r--r-- | net/nfc/core.c | 22 | ||||
| -rw-r--r-- | net/nfc/digital.h | 170 | ||||
| -rw-r--r-- | net/nfc/digital_core.c | 737 | ||||
| -rw-r--r-- | net/nfc/digital_dep.c | 729 | ||||
| -rw-r--r-- | net/nfc/digital_technology.c | 770 | ||||
| -rw-r--r-- | net/nfc/nci/spi.c | 239 | ||||
| -rw-r--r-- | net/nfc/netlink.c | 91 | ||||
| -rw-r--r-- | net/nfc/rawsock.c | 7 |
10 files changed, 2627 insertions, 154 deletions
diff --git a/net/nfc/Kconfig b/net/nfc/Kconfig index 5948b2f..6e0fa0c 100644 --- a/net/nfc/Kconfig +++ b/net/nfc/Kconfig @@ -14,6 +14,20 @@ menuconfig NFC To compile this support as a module, choose M here: the module will be called nfc. +config NFC_DIGITAL + depends on NFC + select CRC_CCITT + select CRC_ITU_T + tristate "NFC Digital Protocol stack support" + default n + help + Say Y if you want to build NFC digital protocol stack support. + This is needed by NFC chipsets whose firmware only implement + the NFC analog layer. + + To compile this support as a module, choose M here: the module will + be called nfc_digital. + source "net/nfc/nci/Kconfig" source "net/nfc/hci/Kconfig" diff --git a/net/nfc/Makefile b/net/nfc/Makefile index a76f453..2555ff8 100644 --- a/net/nfc/Makefile +++ b/net/nfc/Makefile @@ -5,7 +5,9 @@ obj-$(CONFIG_NFC) += nfc.o obj-$(CONFIG_NFC_NCI) += nci/ obj-$(CONFIG_NFC_HCI) += hci/ +obj-$(CONFIG_NFC_DIGITAL) += nfc_digital.o nfc-objs := core.o netlink.o af_nfc.o rawsock.o llcp_core.o llcp_commands.o \ llcp_sock.o +nfc_digital-objs := digital_core.o digital_technology.o digital_dep.o diff --git a/net/nfc/core.c b/net/nfc/core.c index e92923c..8725291 100644 --- a/net/nfc/core.c +++ b/net/nfc/core.c @@ -384,6 +384,19 @@ int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx, { dev->dep_link_up = true; + if (!dev->active_target) { + struct nfc_target *target; + + target = nfc_find_target(dev, target_idx); + if (target == NULL) + return -ENOTCONN; + + dev->active_target = target; + } + + dev->polling = false; + dev->rf_mode = rf_mode; + nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode); return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode); @@ -536,7 +549,7 @@ error: return rc; } -static struct nfc_se *find_se(struct nfc_dev *dev, u32 se_idx) +struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx) { struct nfc_se *se, *n; @@ -546,6 +559,7 @@ static struct nfc_se *find_se(struct nfc_dev *dev, u32 se_idx) return NULL; } +EXPORT_SYMBOL(nfc_find_se); int nfc_enable_se(struct nfc_dev *dev, u32 se_idx) { @@ -577,7 +591,7 @@ int nfc_enable_se(struct nfc_dev *dev, u32 se_idx) goto error; } - se = find_se(dev, se_idx); + se = nfc_find_se(dev, se_idx); if (!se) { rc = -EINVAL; goto error; @@ -622,7 +636,7 @@ int nfc_disable_se(struct nfc_dev *dev, u32 se_idx) goto error; } - se = find_se(dev, se_idx); + se = nfc_find_se(dev, se_idx); if (!se) { rc = -EINVAL; goto error; @@ -881,7 +895,7 @@ int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type) pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx); - se = find_se(dev, se_idx); + se = nfc_find_se(dev, se_idx); if (se) return -EALREADY; diff --git a/net/nfc/digital.h b/net/nfc/digital.h new file mode 100644 index 0000000..08b29b5 --- /dev/null +++ b/net/nfc/digital.h @@ -0,0 +1,170 @@ +/* + * 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. + * + */ + +#ifndef __DIGITAL_H +#define __DIGITAL_H + +#include <net/nfc/nfc.h> +#include <net/nfc/digital.h> + +#include <linux/crc-ccitt.h> +#include <linux/crc-itu-t.h> + +#define PROTOCOL_ERR(req) pr_err("%d: NFC Digital Protocol error: %s\n", \ + __LINE__, req) + +#define DIGITAL_CMD_IN_SEND 0 +#define DIGITAL_CMD_TG_SEND 1 +#define DIGITAL_CMD_TG_LISTEN 2 +#define DIGITAL_CMD_TG_LISTEN_MDAA 3 + +#define DIGITAL_MAX_HEADER_LEN 7 +#define DIGITAL_CRC_LEN 2 + +#define DIGITAL_SENSF_NFCID2_NFC_DEP_B1 0x01 +#define DIGITAL_SENSF_NFCID2_NFC_DEP_B2 0xFE + +#define DIGITAL_SENS_RES_NFC_DEP 0x0100 +#define DIGITAL_SEL_RES_NFC_DEP 0x40 +#define DIGITAL_SENSF_FELICA_SC 0xFFFF + +#define DIGITAL_DRV_CAPS_IN_CRC(ddev) \ + ((ddev)->driver_capabilities & NFC_DIGITAL_DRV_CAPS_IN_CRC) +#define DIGITAL_DRV_CAPS_TG_CRC(ddev) \ + ((ddev)->driver_capabilities & NFC_DIGITAL_DRV_CAPS_TG_CRC) + +struct digital_data_exch { + data_exchange_cb_t cb; + void *cb_context; +}; + +struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev, + unsigned int len); + +int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type, + struct sk_buff *skb, struct digital_tg_mdaa_params *params, + u16 timeout, nfc_digital_cmd_complete_t cmd_cb, + void *cb_context); + +int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param); +static inline int digital_in_send_cmd(struct nfc_digital_dev *ddev, + struct sk_buff *skb, u16 timeout, + nfc_digital_cmd_complete_t cmd_cb, + void *cb_context) +{ + return digital_send_cmd(ddev, DIGITAL_CMD_IN_SEND, skb, NULL, timeout, + cmd_cb, cb_context); +} + +void digital_poll_next_tech(struct nfc_digital_dev *ddev); + +int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech); +int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech); + +int digital_target_found(struct nfc_digital_dev *ddev, + struct nfc_target *target, u8 protocol); + +int digital_in_recv_mifare_res(struct sk_buff *resp); + +int digital_in_send_atr_req(struct nfc_digital_dev *ddev, + struct nfc_target *target, __u8 comm_mode, __u8 *gb, + size_t gb_len); +int digital_in_send_dep_req(struct nfc_digital_dev *ddev, + struct nfc_target *target, struct sk_buff *skb, + struct digital_data_exch *data_exch); + +int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param); +static inline int digital_tg_send_cmd(struct nfc_digital_dev *ddev, + struct sk_buff *skb, u16 timeout, + nfc_digital_cmd_complete_t cmd_cb, void *cb_context) +{ + return digital_send_cmd(ddev, DIGITAL_CMD_TG_SEND, skb, NULL, timeout, + cmd_cb, cb_context); +} + +void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg, + struct sk_buff *resp); + +void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg, + struct sk_buff *resp); + +static inline int digital_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, + nfc_digital_cmd_complete_t cb, void *arg) +{ + return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN, NULL, NULL, + timeout, cb, arg); +} + +void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg, + struct sk_buff *resp); + +int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb); + +int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech); +int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech); + +typedef u16 (*crc_func_t)(u16, const u8 *, size_t); + +#define CRC_A_INIT 0x6363 +#define CRC_B_INIT 0xFFFF +#define CRC_F_INIT 0x0000 + +void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init, + u8 bitwise_inv, u8 msb_first); + +static inline void digital_skb_add_crc_a(struct sk_buff *skb) +{ + digital_skb_add_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0); +} + +static inline void digital_skb_add_crc_b(struct sk_buff *skb) +{ + digital_skb_add_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0); +} + +static inline void digital_skb_add_crc_f(struct sk_buff *skb) +{ + digital_skb_add_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1); +} + +static inline void digital_skb_add_crc_none(struct sk_buff *skb) +{ + return; +} + +int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func, + u16 crc_init, u8 bitwise_inv, u8 msb_first); + +static inline int digital_skb_check_crc_a(struct sk_buff *skb) +{ + return digital_skb_check_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0); +} + +static inline int digital_skb_check_crc_b(struct sk_buff *skb) +{ + return digital_skb_check_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0); +} + +static inline int digital_skb_check_crc_f(struct sk_buff *skb) +{ + return digital_skb_check_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1); +} + +static inline int digital_skb_check_crc_none(struct sk_buff *skb) +{ + return 0; +} + +#endif /* __DIGITAL_H */ diff --git a/net/nfc/digital_core.c b/net/nfc/digital_core.c new file mode 100644 index 0000000..09fc954 --- /dev/null +++ b/net/nfc/digital_core.c @@ -0,0 +1,737 @@ +/* + * 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 <linux/module.h> + +#include "digital.h" + +#define DIGITAL_PROTO_NFCA_RF_TECH \ + (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | NFC_PROTO_NFC_DEP_MASK) + +#define DIGITAL_PROTO_NFCF_RF_TECH \ + (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK) + +struct digital_cmd { + struct list_head queue; + + u8 type; + u8 pending; + + u16 timeout; + struct sk_buff *req; + struct sk_buff *resp; + struct digital_tg_mdaa_params *mdaa_params; + + nfc_digital_cmd_complete_t cmd_cb; + void *cb_context; +}; + +struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev, + unsigned int len) +{ + struct sk_buff *skb; + + skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom, + GFP_KERNEL); + if (skb) + skb_reserve(skb, ddev->tx_headroom); + + return skb; +} + +void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init, + u8 bitwise_inv, u8 msb_first) +{ + u16 crc; + + crc = crc_func(init, skb->data, skb->len); + + if (bitwise_inv) + crc = ~crc; + + if (msb_first) + crc = __fswab16(crc); + + *skb_put(skb, 1) = crc & 0xFF; + *skb_put(skb, 1) = (crc >> 8) & 0xFF; +} + +int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func, + u16 crc_init, u8 bitwise_inv, u8 msb_first) +{ + int rc; + u16 crc; + + if (skb->len <= 2) + return -EIO; + + crc = crc_func(crc_init, skb->data, skb->len - 2); + + if (bitwise_inv) + crc = ~crc; + + if (msb_first) + crc = __swab16(crc); + + rc = (skb->data[skb->len - 2] - (crc & 0xFF)) + + (skb->data[skb->len - 1] - ((crc >> 8) & 0xFF)); + + if (rc) + return -EIO; + + skb_trim(skb, skb->len - 2); + + return 0; +} + +static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on) +{ + ddev->ops->switch_rf(ddev, on); +} + +static inline void digital_abort_cmd(struct nfc_digital_dev *ddev) +{ + ddev->ops->abort_cmd(ddev); +} + +static void digital_wq_cmd_complete(struct work_struct *work) +{ + struct digital_cmd *cmd; + struct nfc_digital_dev *ddev = container_of(work, + struct nfc_digital_dev, + cmd_complete_work); + + mutex_lock(&ddev->cmd_lock); + + cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd, + queue); + if (!cmd) { + mutex_unlock(&ddev->cmd_lock); + return; + } + + list_del(&cmd->queue); + + mutex_unlock(&ddev->cmd_lock); + + if (!IS_ERR(cmd->resp)) + print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1, + cmd->resp->data, cmd->resp->len, false); + + cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp); + + kfree(cmd->mdaa_params); + kfree(cmd); + + schedule_work(&ddev->cmd_work); +} + +static void digital_send_cmd_complete(struct nfc_digital_dev *ddev, + void *arg, struct sk_buff *resp) +{ + struct digital_cmd *cmd = arg; + + cmd->resp = resp; + + schedule_work(&ddev->cmd_complete_work); +} + +static void digital_wq_cmd(struct work_struct *work) +{ + int rc; + struct digital_cmd *cmd; + struct digital_tg_mdaa_params *params; + struct nfc_digital_dev *ddev = container_of(work, + struct nfc_digital_dev, + cmd_work); + + mutex_lock(&ddev->cmd_lock); + + cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd, + queue); + if (!cmd || cmd->pending) { + mutex_unlock(&ddev->cmd_lock); + return; + } + + mutex_unlock(&ddev->cmd_lock); + + if (cmd->req) + print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1, + cmd->req->data, cmd->req->len, false); + + switch (cmd->type) { + case DIGITAL_CMD_IN_SEND: + rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout, + digital_send_cmd_complete, cmd); + break; + + case DIGITAL_CMD_TG_SEND: + rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout, + digital_send_cmd_complete, cmd); + break; + + case DIGITAL_CMD_TG_LISTEN: + rc = ddev->ops->tg_listen(ddev, cmd->timeout, + digital_send_cmd_complete, cmd); + break; + + case DIGITAL_CMD_TG_LISTEN_MDAA: + params = cmd->mdaa_params; + + rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout, + digital_send_cmd_complete, cmd); + break; + + default: + pr_err("Unknown cmd type %d\n", cmd->type); + return; + } + + if (!rc) + return; + + pr_err("in_send_command returned err %d\n", rc); + + mutex_lock(&ddev->cmd_lock); + list_del(&cmd->queue); + mutex_unlock(&ddev->cmd_lock); + + kfree_skb(cmd->req); + kfree(cmd->mdaa_params); + kfree(cmd); + + schedule_work(&ddev->cmd_work); +} + +int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type, + struct sk_buff *skb, struct digital_tg_mdaa_params *params, + u16 timeout, nfc_digital_cmd_complete_t cmd_cb, + void *cb_context) +{ + struct digital_cmd *cmd; + + cmd = kzalloc(sizeof(struct digital_cmd), GFP_KERNEL); + if (!cmd) + return -ENOMEM; + + cmd->type = cmd_type; + cmd->timeout = timeout; + cmd->req = skb; + cmd->mdaa_params = params; + cmd->cmd_cb = cmd_cb; + cmd->cb_context = cb_context; + INIT_LIST_HEAD(&cmd->queue); + + mutex_lock(&ddev->cmd_lock); + list_add_tail(&cmd->queue, &ddev->cmd_queue); + mutex_unlock(&ddev->cmd_lock); + + schedule_work(&ddev->cmd_work); + + return 0; +} + +int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param) +{ + int rc; + + rc = ddev->ops->in_configure_hw(ddev, type, param); + if (rc) + pr_err("in_configure_hw failed: %d\n", rc); + + return rc; +} + +int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param) +{ + int rc; + + rc = ddev->ops->tg_configure_hw(ddev, type, param); + if (rc) + pr_err("tg_configure_hw failed: %d\n", rc); + + return rc; +} + +static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech) +{ + struct digital_tg_mdaa_params *params; + + params = kzalloc(sizeof(struct digital_tg_mdaa_params), GFP_KERNEL); + if (!params) + return -ENOMEM; + + params->sens_res = DIGITAL_SENS_RES_NFC_DEP; + get_random_bytes(params->nfcid1, sizeof(params->nfcid1)); + params->sel_res = DIGITAL_SEL_RES_NFC_DEP; + + params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1; + params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2; + get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2); + params->sc = DIGITAL_SENSF_FELICA_SC; + + return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params, + 500, digital_tg_recv_atr_req, NULL); +} + +int digital_target_found(struct nfc_digital_dev *ddev, + struct nfc_target *target, u8 protocol) +{ + int rc; + u8 framing; + u8 rf_tech; + int (*check_crc)(struct sk_buff *skb); + void (*add_crc)(struct sk_buff *skb); + + rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech; + + switch (protocol) { + case NFC_PROTO_JEWEL: + framing = NFC_DIGITAL_FRAMING_NFCA_T1T; + check_crc = digital_skb_check_crc_b; + add_crc = digital_skb_add_crc_b; + break; + + case NFC_PROTO_MIFARE: + framing = NFC_DIGITAL_FRAMING_NFCA_T2T; + check_crc = digital_skb_check_crc_a; + add_crc = digital_skb_add_crc_a; + break; + + case NFC_PROTO_FELICA: + framing = NFC_DIGITAL_FRAMING_NFCF_T3T; + check_crc = digital_skb_check_crc_f; + add_crc = digital_skb_add_crc_f; + break; + + case NFC_PROTO_NFC_DEP: + if (rf_tech == NFC_DIGITAL_RF_TECH_106A) { + framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP; + check_crc = digital_skb_check_crc_a; + add_crc = digital_skb_add_crc_a; + } else { + framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP; + check_crc = digital_skb_check_crc_f; + add_crc = digital_skb_add_crc_f; + } + break; + + default: + pr_err("Invalid protocol %d\n", protocol); + return -EINVAL; + } + + pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol); + + ddev->curr_rf_tech = rf_tech; + ddev->curr_protocol = protocol; + + if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) { + ddev->skb_add_crc = digital_skb_add_crc_none; + ddev->skb_check_crc = digital_skb_check_crc_none; + } else { + ddev->skb_add_crc = add_crc; + ddev->skb_check_crc = check_crc; + } + + rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing); + if (rc) + return rc; + + target->supported_protocols = (1 << protocol); + rc = nfc_targets_found(ddev->nfc_dev, target, 1); + if (rc) + return rc; + + ddev->poll_tech_count = 0; + + return 0; +} + +void digital_poll_next_tech(struct nfc_digital_dev *ddev) +{ + digital_switch_rf(ddev, 0); + + mutex_lock(&ddev->poll_lock); + + if (!ddev->poll_tech_count) { + mutex_unlock(&ddev->poll_lock); + return; + } + + ddev->poll_tech_index = (ddev->poll_tech_index + 1) % + ddev->poll_tech_count; + + mutex_unlock(&ddev->poll_lock); + + schedule_work(&ddev->poll_work); +} + +static void digital_wq_poll(struct work_struct *work) +{ + int rc; + struct digital_poll_tech *poll_tech; + struct nfc_digital_dev *ddev = container_of(work, + struct nfc_digital_dev, + poll_work); + mutex_lock(&ddev->poll_lock); + + if (!ddev->poll_tech_count) { + mutex_unlock(&ddev->poll_lock); + return; + } + + poll_tech = &ddev->poll_techs[ddev->poll_tech_index]; + + mutex_unlock(&ddev->poll_lock); + + rc = poll_tech->poll_func(ddev, poll_tech->rf_tech); + if (rc) + digital_poll_next_tech(ddev); +} + +static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech, + digital_poll_t poll_func) +{ + struct digital_poll_tech *poll_tech; + + if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX) + return; + + poll_tech = &ddev->poll_techs[ddev->poll_tech_count++]; + + poll_tech->rf_tech = rf_tech; + poll_tech->poll_func = poll_func; +} + +/** + * start_poll operation + * + * For every supported protocol, the corresponding polling function is added + * to the table of polling technologies (ddev->poll_techs[]) using + * digital_add_poll_tech(). + * When a polling function fails (by timeout or protocol error) the next one is + * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work). + */ +static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols, + __u32 tm_protocols) +{ + struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); + u32 matching_im_protocols, matching_tm_protocols; + + pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols, + tm_protocols, ddev->protocols); + + matching_im_protocols = ddev->protocols & im_protocols; + matching_tm_protocols = ddev->protocols & tm_protocols; + + if (!matching_im_protocols && !matching_tm_protocols) { + pr_err("Unknown protocol\n"); + return -EINVAL; + } + + if (ddev->poll_tech_count) { + pr_err("Already polling\n"); + return -EBUSY; + } + + if (ddev->curr_protocol) { + pr_err("A target is already active\n"); + return -EBUSY; + } + + ddev->poll_tech_count = 0; + ddev->poll_tech_index = 0; + + if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH) + digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A, + digital_in_send_sens_req); + + if (im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) { + digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F, + digital_in_send_sensf_req); + + digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F, + digital_in_send_sensf_req); + } + + if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) { + if (ddev->ops->tg_listen_mdaa) { + digital_add_poll_tech(ddev, 0, + digital_tg_listen_mdaa); + } else { + digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A, + digital_tg_listen_nfca); + + digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F, + digital_tg_listen_nfcf); + + digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F, + digital_tg_listen_nfcf); + } + } + + if (!ddev->poll_tech_count) { + pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n", + matching_im_protocols, matching_tm_protocols); + return -EINVAL; + } + + schedule_work(&ddev->poll_work); + + return 0; +} + +static void digital_stop_poll(struct nfc_dev *nfc_dev) +{ + struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); + + mutex_lock(&ddev->poll_lock); + + if (!ddev->poll_tech_count) { + pr_err("Polling operation was not running\n"); + mutex_unlock(&ddev->poll_lock); + return; + } + + ddev->poll_tech_count = 0; + + mutex_unlock(&ddev->poll_lock); + + cancel_work_sync(&ddev->poll_work); + + digital_abort_cmd(ddev); +} + +static int digital_dev_up(struct nfc_dev *nfc_dev) +{ + struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); + + digital_switch_rf(ddev, 1); + + return 0; +} + +static int digital_dev_down(struct nfc_dev *nfc_dev) +{ + struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); + + digital_switch_rf(ddev, 0); + + return 0; +} + +static int digital_dep_link_up(struct nfc_dev *nfc_dev, + struct nfc_target *target, + __u8 comm_mode, __u8 *gb, size_t gb_len) +{ + struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); + + return digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len); +} + +static int digital_dep_link_down(struct nfc_dev *nfc_dev) +{ + struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); + + ddev->curr_protocol = 0; + + return 0; +} + +static int digital_activate_target(struct nfc_dev *nfc_dev, + struct nfc_target *target, __u32 protocol) +{ + return 0; +} + +static void digital_deactivate_target(struct nfc_dev *nfc_dev, + struct nfc_target *target) +{ + struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); + + ddev->curr_protocol = 0; +} + +static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb) +{ + struct nfc_digital_dev *ddev = nfc_get_drvdata(dev); + + return digital_tg_send_dep_res(ddev, skb); +} + +static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg, + struct sk_buff *resp) +{ + struct digital_data_exch *data_exch = arg; + int rc; + + if (IS_ERR(resp)) { + rc = PTR_ERR(resp); + goto done; + } + + if (ddev->curr_protocol == NFC_PROTO_MIFARE) + rc = digital_in_recv_mifare_res(resp); + else + rc = ddev->skb_check_crc(resp); + + if (rc) { + kfree_skb(resp); + resp = NULL; + } + +done: + data_exch->cb(data_exch->cb_context, resp, rc); + + kfree(data_exch); +} + +static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target, + struct sk_buff *skb, data_exchange_cb_t cb, + void *cb_context) +{ + struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); + struct digital_data_exch *data_exch; + + data_exch = kzalloc(sizeof(struct digital_data_exch), GFP_KERNEL); + if (!data_exch) { + pr_err("Failed to allocate data_exch struct\n"); + return -ENOMEM; + } + + data_exch->cb = cb; + data_exch->cb_context = cb_context; + + if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) + return digital_in_send_dep_req(ddev, target, skb, data_exch); + + ddev->skb_add_crc(skb); + + return digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete, + data_exch); +} + +static struct nfc_ops digital_nfc_ops = { + .dev_up = digital_dev_up, + .dev_down = digital_dev_down, + .start_poll = digital_start_poll, + .stop_poll = digital_stop_poll, + .dep_link_up = digital_dep_link_up, + .dep_link_down = digital_dep_link_down, + .activate_target = digital_activate_target, + .deactivate_target = digital_deactivate_target, + .tm_send = digital_tg_send, + .im_transceive = digital_in_send, +}; + +struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops, + __u32 supported_protocols, + __u32 driver_capabilities, + int tx_headroom, int tx_tailroom) +{ + struct nfc_digital_dev *ddev; + + if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen || + !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd || + !ops->switch_rf) + return NULL; + + ddev = kzalloc(sizeof(struct nfc_digital_dev), GFP_KERNEL); + if (!ddev) + return NULL; + + ddev->driver_capabilities = driver_capabilities; + ddev->ops = ops; + + mutex_init(&ddev->cmd_lock); + INIT_LIST_HEAD(&ddev->cmd_queue); + + INIT_WORK(&ddev->cmd_work, digital_wq_cmd); + INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete); + + mutex_init(&ddev->poll_lock); + INIT_WORK(&ddev->poll_work, digital_wq_poll); + + if (supported_protocols & NFC_PROTO_JEWEL_MASK) + ddev->protocols |= NFC_PROTO_JEWEL_MASK; + if (supported_protocols & NFC_PROTO_MIFARE_MASK) + ddev->protocols |= NFC_PROTO_MIFARE_MASK; + if (supported_protocols & NFC_PROTO_FELICA_MASK) + ddev->protocols |= NFC_PROTO_FELICA_MASK; + if (supported_protocols & NFC_PROTO_NFC_DEP_MASK) + ddev->protocols |= NFC_PROTO_NFC_DEP_MASK; + + ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN; + ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN; + + ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols, + ddev->tx_headroom, + ddev->tx_tailroom); + if (!ddev->nfc_dev) { + pr_err("nfc_allocate_device failed\n"); + goto free_dev; + } + + nfc_set_drvdata(ddev->nfc_dev, ddev); + + return ddev; + +free_dev: + kfree(ddev); + + return NULL; +} +EXPORT_SYMBOL(nfc_digital_allocate_device); + +void nfc_digital_free_device(struct nfc_digital_dev *ddev) +{ + nfc_free_device(ddev->nfc_dev); + kfree(ddev); +} +EXPORT_SYMBOL(nfc_digital_free_device); + +int nfc_digital_register_device(struct nfc_digital_dev *ddev) +{ + return nfc_register_device(ddev->nfc_dev); +} +EXPORT_SYMBOL(nfc_digital_register_device); + +void nfc_digital_unregister_device(struct nfc_digital_dev *ddev) +{ + struct digital_cmd *cmd, *n; + + nfc_unregister_device(ddev->nfc_dev); + + mutex_lock(&ddev->poll_lock); + ddev->poll_tech_count = 0; + mutex_unlock(&ddev->poll_lock); + + cancel_work_sync(&ddev->poll_work); + cancel_work_sync(&ddev->cmd_work); + cancel_work_sync(&ddev->cmd_complete_work); + + list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) { + list_del(&cmd->queue); + kfree(cmd->mdaa_params); + kfree(cmd); + } +} +EXPORT_SYMBOL(nfc_digital_unregister_device); + +MODULE_LICENSE("GPL"); diff --git a/net/nfc/digital_dep.c b/net/nfc/digital_dep.c new file mode 100644 index 0000000..07bbc24 --- /dev/null +++ b/net/nfc/digital_dep.c @@ -0,0 +1,729 @@ +/* + * 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_NFC_DEP_FRAME_DIR_OUT 0xD4 +#define DIGITAL_NFC_DEP_FRAME_DIR_IN 0xD5 + +#define DIGITAL_NFC_DEP_NFCA_SOD_SB 0xF0 + +#define DIGITAL_CMD_ATR_REQ 0x00 +#define DIGITAL_CMD_ATR_RES 0x01 +#define DIGITAL_CMD_PSL_REQ 0x04 +#define DIGITAL_CMD_PSL_RES 0x05 +#define DIGITAL_CMD_DEP_REQ 0x06 +#define DIGITAL_CMD_DEP_RES 0x07 + +#define DIGITAL_ATR_REQ_MIN_SIZE 16 +#define DIGITAL_ATR_REQ_MAX_SIZE 64 + +#define DIGITAL_NFCID3_LEN ((u8)8) +#define DIGITAL_LR_BITS_PAYLOAD_SIZE_254B 0x30 +#define DIGITAL_GB_BIT 0x02 + +#define DIGITAL_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0) + +#define DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT 0x10 + +#define DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb) \ + ((pfb) & DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT) +#define DIGITAL_NFC_DEP_MI_BIT_SET(pfb) ((pfb) & 0x10) +#define DIGITAL_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08) +#define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & 0x04) +#define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03) + +#define DIGITAL_NFC_DEP_PFB_I_PDU 0x00 +#define DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU 0x40 +#define DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU 0x80 + +struct digital_atr_req { + u8 dir; + u8 cmd; + u8 nfcid3[10]; + u8 did; + u8 bs; + u8 br; + u8 pp; + u8 gb[0]; +} __packed; + +struct digital_atr_res { + u8 dir; + u8 cmd; + u8 nfcid3[10]; + u8 did; + u8 bs; + u8 br; + u8 to; + u8 pp; + u8 gb[0]; +} __packed; + +struct digital_psl_req { + u8 dir; + u8 cmd; + u8 did; + u8 brs; + u8 fsl; +} __packed; + +struct digital_psl_res { + u8 dir; + u8 cmd; + u8 did; +} __packed; + +struct digital_dep_req_res { + u8 dir; + u8 cmd; + u8 pfb; +} __packed; + +static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, + struct sk_buff *resp); + +static void digital_skb_push_dep_sod(struct nfc_digital_dev *ddev, + struct sk_buff *skb) +{ + skb_push(skb, sizeof(u8)); + + skb->data[0] = skb->len; + + if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) + *skb_push(skb, sizeof(u8)) = DIGITAL_NFC_DEP_NFCA_SOD_SB; +} + +static int digital_skb_pull_dep_sod(struct nfc_digital_dev *ddev, + struct sk_buff *skb) +{ + u8 size; + + if (skb->len < 2) + return -EIO; + + if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) + skb_pull(skb, sizeof(u8)); + + size = skb->data[0]; + if (size != skb->len) + return -EIO; + + skb_pull(skb, sizeof(u8)); + + return 0; +} + +static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg, + struct sk_buff *resp) +{ + struct nfc_target *target = arg; + struct digital_atr_res *atr_res; + u8 gb_len; + int rc; + + 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; + } + + if (resp->len < sizeof(struct digital_atr_res)) { + rc = -EIO; + goto exit; + } + + gb_len = resp->len - sizeof(struct digital_atr_res); + + atr_res = (struct digital_atr_res *)resp->data; + + rc = nfc_set_remote_general_bytes(ddev->nfc_dev, atr_res->gb, gb_len); + if (rc) + goto exit; + + rc = nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, + NFC_RF_INITIATOR); + + ddev->curr_nfc_dep_pni = 0; + +exit: + dev_kfree_skb(resp); + + if (rc) + ddev->curr_protocol = 0; +} + +int digital_in_send_atr_req(struct nfc_digital_dev *ddev, + struct nfc_target *target, __u8 comm_mode, __u8 *gb, + size_t gb_len) +{ + struct sk_buff *skb; + struct digital_atr_req *atr_req; + uint size; + + size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len; + + if (size > DIGITAL_ATR_REQ_MAX_SIZE) { + PROTOCOL_ERR("14.6.1.1"); + return -EINVAL; + } + + skb = digital_skb_alloc(ddev, size); + if (!skb) + return -ENOMEM; + + skb_put(skb, sizeof(struct digital_atr_req)); + + atr_req = (struct digital_atr_req *)skb->data; + memset(atr_req, 0, sizeof(struct digital_atr_req)); + + atr_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; + atr_req->cmd = DIGITAL_CMD_ATR_REQ; + if (target->nfcid2_len) + memcpy(atr_req->nfcid3, target->nfcid2, + max(target->nfcid2_len, DIGITAL_NFCID3_LEN)); + else + get_random_bytes(atr_req->nfcid3, DIGITAL_NFCID3_LEN); + + atr_req->did = 0; + atr_req->bs = 0; + atr_req->br = 0; + + atr_req->pp = DIGITAL_LR_BITS_PAYLOAD_SIZE_254B; + + if (gb_len) { + atr_req->pp |= DIGITAL_GB_BIT; + memcpy(skb_put(skb, gb_len), gb, gb_len); + } + + digital_skb_push_dep_sod(ddev, skb); + + ddev->skb_add_crc(skb); + + digital_in_send_cmd(ddev, skb, 500, digital_in_recv_atr_res, target); + + return 0; +} + +static int digital_in_send_rtox(struct nfc_digital_dev *ddev, + struct digital_data_exch *data_exch, u8 rtox) +{ + struct digital_dep_req_res *dep_req; + struct sk_buff *skb; + int rc; + + skb = digital_skb_alloc(ddev, 1); + if (!skb) + return -ENOMEM; + + *skb_put(skb, 1) = rtox; + + skb_push(skb, sizeof(struct digital_dep_req_res)); + + dep_req = (struct digital_dep_req_res *)skb->data; + + dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; + dep_req->cmd = DIGITAL_CMD_DEP_REQ; + dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU | + DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT; + + digital_skb_push_dep_sod(ddev, skb); + + ddev->skb_add_crc(skb); + + rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, + data_exch); + + return rc; +} + +static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, + struct sk_buff *resp) +{ + struct digital_data_exch *data_exch = arg; + struct digital_dep_req_res *dep_res; + u8 pfb; + uint size; + int rc; + + 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 error; + } + + rc = digital_skb_pull_dep_sod(ddev, resp); + if (rc) { + PROTOCOL_ERR("14.4.1.2"); + goto exit; + } + + dep_res = (struct digital_dep_req_res *)resp->data; + + if (resp->len < sizeof(struct digital_dep_req_res) || + dep_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN || + dep_res->cmd != DIGITAL_CMD_DEP_RES) { + rc = -EIO; + goto error; + } + + pfb = dep_res->pfb; + + switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { + case DIGITAL_NFC_DEP_PFB_I_PDU: + if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { + PROTOCOL_ERR("14.12.3.3"); + rc = -EIO; + goto error; + } + + ddev->curr_nfc_dep_pni = + DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); + rc = 0; + break; + + case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: + pr_err("Received a ACK/NACK PDU\n"); + rc = -EIO; + goto error; + + case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: + if (!DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { + rc = -EINVAL; + goto error; + } + + rc = digital_in_send_rtox(ddev, data_exch, resp->data[3]); + if (rc) + goto error; + + kfree_skb(resp); + return; + } + + if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb)) { + pr_err("MI bit set. Chained PDU not supported\n"); + rc = -EIO; + goto error; + } + + size = sizeof(struct digital_dep_req_res); + + if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) + size++; + + if (size > resp->len) { + rc = -EIO; + goto error; + } + + skb_pull(resp, size); + +exit: + data_exch->cb(data_exch->cb_context, resp, rc); + +error: + kfree(data_exch); + + if (rc) + kfree_skb(resp); +} + +int digital_in_send_dep_req(struct nfc_digital_dev *ddev, + struct nfc_target *target, struct sk_buff *skb, + struct digital_data_exch *data_exch) +{ + struct digital_dep_req_res *dep_req; + + skb_push(skb, sizeof(struct digital_dep_req_res)); + + dep_req = (struct digital_dep_req_res *)skb->data; + dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; + dep_req->cmd = DIGITAL_CMD_DEP_REQ; + dep_req->pfb = ddev->curr_nfc_dep_pni; + + digital_skb_push_dep_sod(ddev, skb); + + ddev->skb_add_crc(skb); + + return digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, + data_exch); +} + +static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, + struct sk_buff *resp) +{ + int rc; + struct digital_dep_req_res *dep_req; + size_t size; + + 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; + } + + size = sizeof(struct digital_dep_req_res); + dep_req = (struct digital_dep_req_res *)resp->data; + + if (resp->len < size || dep_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || + dep_req->cmd != DIGITAL_CMD_DEP_REQ) { + rc = -EIO; + goto exit; + } + + if (DIGITAL_NFC_DEP_DID_BIT_SET(dep_req->pfb)) + size++; + + if (resp->len < size) { + rc = -EIO; + goto exit; + } + + switch (DIGITAL_NFC_DEP_PFB_TYPE(dep_req->pfb)) { + case DIGITAL_NFC_DEP_PFB_I_PDU: + pr_debug("DIGITAL_NFC_DEP_PFB_I_PDU\n"); + ddev->curr_nfc_dep_pni = DIGITAL_NFC_DEP_PFB_PNI(dep_req->pfb); + break; + case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: + pr_err("Received a ACK/NACK PDU\n"); + rc = -EINVAL; + goto exit; + break; + case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: + pr_err("Received a SUPERVISOR PDU\n"); + rc = -EINVAL; + goto exit; + break; + } + + skb_pull(resp, size); + + rc = nfc_tm_data_received(ddev->nfc_dev, resp); + +exit: + if (rc) + kfree_skb(resp); +} + +int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb) +{ + struct digital_dep_req_res *dep_res; + + skb_push(skb, sizeof(struct digital_dep_req_res)); + dep_res = (struct digital_dep_req_res *)skb->data; + + dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; + dep_res->cmd = DIGITAL_CMD_DEP_RES; + dep_res->pfb = ddev->curr_nfc_dep_pni; + + digital_skb_push_dep_sod(ddev, skb); + + ddev->skb_add_crc(skb); + + return digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, + NULL); +} + +static void digital_tg_send_psl_res_complete(struct nfc_digital_dev *ddev, + void *arg, struct sk_buff *resp) +{ + u8 rf_tech = PTR_ERR(arg); + + if (IS_ERR(resp)) + return; + + digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech); + + digital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL); + + dev_kfree_skb(resp); +} + +static int digital_tg_send_psl_res(struct nfc_digital_dev *ddev, u8 did, + u8 rf_tech) +{ + struct digital_psl_res *psl_res; + struct sk_buff *skb; + int rc; + + skb = digital_skb_alloc(ddev, sizeof(struct digital_psl_res)); + if (!skb) + return -ENOMEM; + + skb_put(skb, sizeof(struct digital_psl_res)); + + psl_res = (struct digital_psl_res *)skb->data; + + psl_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; + psl_res->cmd = DIGITAL_CMD_PSL_RES; + psl_res->did = did; + + digital_skb_push_dep_sod(ddev, skb); + + ddev->skb_add_crc(skb); + + 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); +} diff --git a/net/nfc/digital_technology.c b/net/nfc/digital_technology.c new file mode 100644 index 0000000..251c8c7 --- /dev/null +++ b/net/nfc/digital_technology.c @@ -0,0 +1,770 @@ +/* + * 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) & 0x0C00) == 0x0C00) +#define DIGITAL_SENS_RES_IS_VALID(sens_res) \ + ((!((sens_res) & 0x001F) && (((sens_res) & 0x0C00) == 0x0C00)) || \ + (((sens_res) & 0x001F) && ((sens_res) & 0x0C00) != 0x0C00)) + +#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; + 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; + } + + target->sens_res = __le16_to_cpu(*(__le16 *)resp->data); + + if (!DIGITAL_SENS_RES_IS_VALID(target->sens_res)) { + PROTOCOL_ERR("4.6.3.3"); + rc = -EINVAL; + goto exit; + } + + if (DIGITAL_SENS_RES_IS_T1T(target->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); +} diff --git a/net/nfc/nci/spi.c b/net/nfc/nci/spi.c index c7cf37b..f1d426f 100644 --- a/net/nfc/nci/spi.c +++ b/net/nfc/nci/spi.c @@ -21,11 +21,8 @@ #include <linux/export.h> #include <linux/spi/spi.h> #include <linux/crc-ccitt.h> -#include <linux/nfc.h> #include <net/nfc/nci_core.h> -#define NCI_SPI_HDR_LEN 4 -#define NCI_SPI_CRC_LEN 2 #define NCI_SPI_ACK_SHIFT 6 #define NCI_SPI_MSB_PAYLOAD_MASK 0x3F @@ -41,54 +38,48 @@ #define CRC_INIT 0xFFFF -static int nci_spi_open(struct nci_dev *nci_dev) -{ - struct nci_spi_dev *ndev = nci_get_drvdata(nci_dev); - - return ndev->ops->open(ndev); -} - -static int nci_spi_close(struct nci_dev *nci_dev) -{ - struct nci_spi_dev *ndev = nci_get_drvdata(nci_dev); - - return ndev->ops->close(ndev); -} - -static int __nci_spi_send(struct nci_spi_dev *ndev, struct sk_buff *skb) +static int __nci_spi_send(struct nci_spi *nspi, struct sk_buff *skb, + int cs_change) { struct spi_message m; struct spi_transfer t; - t.tx_buf = skb->data; - t.len = skb->len; - t.cs_change = 0; - t.delay_usecs = ndev->xfer_udelay; + memset(&t, 0, sizeof(struct spi_transfer)); + /* a NULL skb means we just want the SPI chip select line to raise */ + if (skb) { + t.tx_buf = skb->data; + t.len = skb->len; + } else { + /* still set tx_buf non NULL to make the driver happy */ + t.tx_buf = &t; + t.len = 0; + } + t.cs_change = cs_change; + t.delay_usecs = nspi->xfer_udelay; spi_message_init(&m); spi_message_add_tail(&t, &m); - return spi_sync(ndev->spi, &m); + return spi_sync(nspi->spi, &m); } -static int nci_spi_send(struct nci_dev *nci_dev, struct sk_buff *skb) +int nci_spi_send(struct nci_spi *nspi, + struct completion *write_handshake_completion, + struct sk_buff *skb) { - struct nci_spi_dev *ndev = nci_get_drvdata(nci_dev); unsigned int payload_len = skb->len; unsigned char *hdr; int ret; long completion_rc; - ndev->ops->deassert_int(ndev); - /* add the NCI SPI header to the start of the buffer */ hdr = skb_push(skb, NCI_SPI_HDR_LEN); hdr[0] = NCI_SPI_DIRECT_WRITE; - hdr[1] = ndev->acknowledge_mode; + hdr[1] = nspi->acknowledge_mode; hdr[2] = payload_len >> 8; hdr[3] = payload_len & 0xFF; - if (ndev->acknowledge_mode == NCI_SPI_CRC_ENABLED) { + if (nspi->acknowledge_mode == NCI_SPI_CRC_ENABLED) { u16 crc; crc = crc_ccitt(CRC_INIT, skb->data, skb->len); @@ -96,123 +87,77 @@ static int nci_spi_send(struct nci_dev *nci_dev, struct sk_buff *skb) *skb_put(skb, 1) = crc & 0xFF; } - ret = __nci_spi_send(ndev, skb); + if (write_handshake_completion) { + /* Trick SPI driver to raise chip select */ + ret = __nci_spi_send(nspi, NULL, 1); + if (ret) + goto done; - kfree_skb(skb); - ndev->ops->assert_int(ndev); + /* wait for NFC chip hardware handshake to complete */ + if (wait_for_completion_timeout(write_handshake_completion, + msecs_to_jiffies(1000)) == 0) { + ret = -ETIME; + goto done; + } + } - if (ret != 0 || ndev->acknowledge_mode == NCI_SPI_CRC_DISABLED) + ret = __nci_spi_send(nspi, skb, 0); + if (ret != 0 || nspi->acknowledge_mode == NCI_SPI_CRC_DISABLED) goto done; - init_completion(&ndev->req_completion); - completion_rc = - wait_for_completion_interruptible_timeout(&ndev->req_completion, - NCI_SPI_SEND_TIMEOUT); + init_completion(&nspi->req_completion); + completion_rc = wait_for_completion_interruptible_timeout( + &nspi->req_completion, + NCI_SPI_SEND_TIMEOUT); - if (completion_rc <= 0 || ndev->req_result == ACKNOWLEDGE_NACK) + if (completion_rc <= 0 || nspi->req_result == ACKNOWLEDGE_NACK) ret = -EIO; done: + kfree_skb(skb); + return ret; } - -static struct nci_ops nci_spi_ops = { - .open = nci_spi_open, - .close = nci_spi_close, - .send = nci_spi_send, -}; +EXPORT_SYMBOL_GPL(nci_spi_send); /* ---- Interface to NCI SPI drivers ---- */ /** - * nci_spi_allocate_device - allocate a new nci spi device + * nci_spi_allocate_spi - allocate a new nci spi * * @spi: SPI device - * @ops: device operations - * @supported_protocols: NFC protocols supported by the device - * @supported_se: NFC Secure Elements supported by the device - * @acknowledge_mode: Acknowledge mode used by the device + * @acknowledge_mode: Acknowledge mode used by the NFC device * @delay: delay between transactions in us + * @ndev: nci dev to send incoming nci frames to */ -struct nci_spi_dev *nci_spi_allocate_device(struct spi_device *spi, - struct nci_spi_ops *ops, - u32 supported_protocols, - u32 supported_se, - u8 acknowledge_mode, - unsigned int delay) +struct nci_spi *nci_spi_allocate_spi(struct spi_device *spi, + u8 acknowledge_mode, unsigned int delay, + struct nci_dev *ndev) { - struct nci_spi_dev *ndev; - int tailroom = 0; + struct nci_spi *nspi; - if (!ops->open || !ops->close || !ops->assert_int || !ops->deassert_int) + nspi = devm_kzalloc(&spi->dev, sizeof(struct nci_spi), GFP_KERNEL); + if (!nspi) return NULL; - if (!supported_protocols) - return NULL; - - ndev = devm_kzalloc(&spi->dev, sizeof(struct nci_dev), GFP_KERNEL); - if (!ndev) - return NULL; + nspi->acknowledge_mode = acknowledge_mode; + nspi->xfer_udelay = delay; - ndev->ops = ops; - ndev->acknowledge_mode = acknowledge_mode; - ndev->xfer_udelay = delay; + nspi->spi = spi; + nspi->ndev = ndev; - if (acknowledge_mode == NCI_SPI_CRC_ENABLED) - tailroom += NCI_SPI_CRC_LEN; - - ndev->nci_dev = nci_allocate_device(&nci_spi_ops, supported_protocols, - NCI_SPI_HDR_LEN, tailroom); - if (!ndev->nci_dev) - return NULL; - - nci_set_drvdata(ndev->nci_dev, ndev); - - return ndev; + return nspi; } -EXPORT_SYMBOL_GPL(nci_spi_allocate_device); +EXPORT_SYMBOL_GPL(nci_spi_allocate_spi); -/** - * nci_spi_free_device - deallocate nci spi device - * - * @ndev: The nci spi device to deallocate - */ -void nci_spi_free_device(struct nci_spi_dev *ndev) -{ - nci_free_device(ndev->nci_dev); -} -EXPORT_SYMBOL_GPL(nci_spi_free_device); - -/** - * nci_spi_register_device - register a nci spi device in the nfc subsystem - * - * @pdev: The nci spi device to register - */ -int nci_spi_register_device(struct nci_spi_dev *ndev) -{ - return nci_register_device(ndev->nci_dev); -} -EXPORT_SYMBOL_GPL(nci_spi_register_device); - -/** - * nci_spi_unregister_device - unregister a nci spi device in the nfc subsystem - * - * @dev: The nci spi device to unregister - */ -void nci_spi_unregister_device(struct nci_spi_dev *ndev) -{ - nci_unregister_device(ndev->nci_dev); -} -EXPORT_SYMBOL_GPL(nci_spi_unregister_device); - -static int send_acknowledge(struct nci_spi_dev *ndev, u8 acknowledge) +static int send_acknowledge(struct nci_spi *nspi, u8 acknowledge) { struct sk_buff *skb; unsigned char *hdr; u16 crc; int ret; - skb = nci_skb_alloc(ndev->nci_dev, 0, GFP_KERNEL); + skb = nci_skb_alloc(nspi->ndev, 0, GFP_KERNEL); /* add the NCI SPI header to the start of the buffer */ hdr = skb_push(skb, NCI_SPI_HDR_LEN); @@ -225,14 +170,14 @@ static int send_acknowledge(struct nci_spi_dev *ndev, u8 acknowledge) *skb_put(skb, 1) = crc >> 8; *skb_put(skb, 1) = crc & 0xFF; - ret = __nci_spi_send(ndev, skb); + ret = __nci_spi_send(nspi, skb, 0); kfree_skb(skb); return ret; } -static struct sk_buff *__nci_spi_recv_frame(struct nci_spi_dev *ndev) +static struct sk_buff *__nci_spi_read(struct nci_spi *nspi) { struct sk_buff *skb; struct spi_message m; @@ -242,43 +187,49 @@ static struct sk_buff *__nci_spi_recv_frame(struct nci_spi_dev *ndev) int ret; spi_message_init(&m); + + memset(&tx, 0, sizeof(struct spi_transfer)); req[0] = NCI_SPI_DIRECT_READ; - req[1] = ndev->acknowledge_mode; + req[1] = nspi->acknowledge_mode; tx.tx_buf = req; tx.len = 2; tx.cs_change = 0; spi_message_add_tail(&tx, &m); + + memset(&rx, 0, sizeof(struct spi_transfer)); rx.rx_buf = resp_hdr; rx.len = 2; rx.cs_change = 1; spi_message_add_tail(&rx, &m); - ret = spi_sync(ndev->spi, &m); + ret = spi_sync(nspi->spi, &m); if (ret) return NULL; - if (ndev->acknowledge_mode == NCI_SPI_CRC_ENABLED) + if (nspi->acknowledge_mode == NCI_SPI_CRC_ENABLED) rx_len = ((resp_hdr[0] & NCI_SPI_MSB_PAYLOAD_MASK) << 8) + resp_hdr[1] + NCI_SPI_CRC_LEN; else rx_len = (resp_hdr[0] << 8) | resp_hdr[1]; - skb = nci_skb_alloc(ndev->nci_dev, rx_len, GFP_KERNEL); + skb = nci_skb_alloc(nspi->ndev, rx_len, GFP_KERNEL); if (!skb) return NULL; spi_message_init(&m); + + memset(&rx, 0, sizeof(struct spi_transfer)); rx.rx_buf = skb_put(skb, rx_len); rx.len = rx_len; rx.cs_change = 0; - rx.delay_usecs = ndev->xfer_udelay; + rx.delay_usecs = nspi->xfer_udelay; spi_message_add_tail(&rx, &m); - ret = spi_sync(ndev->spi, &m); + ret = spi_sync(nspi->spi, &m); if (ret) goto receive_error; - if (ndev->acknowledge_mode == NCI_SPI_CRC_ENABLED) { + if (nspi->acknowledge_mode == NCI_SPI_CRC_ENABLED) { *skb_push(skb, 1) = resp_hdr[1]; *skb_push(skb, 1) = resp_hdr[0]; } @@ -318,61 +269,53 @@ static u8 nci_spi_get_ack(struct sk_buff *skb) } /** - * nci_spi_recv_frame - receive frame from NCI SPI drivers + * nci_spi_read - read frame from NCI SPI drivers * - * @ndev: The nci spi device + * @nspi: The nci spi * Context: can sleep * * This call may only be used from a context that may sleep. The sleep * is non-interruptible, and has no timeout. * - * It returns zero on success, else a negative error code. + * It returns an allocated skb containing the frame on success, or NULL. */ -int nci_spi_recv_frame(struct nci_spi_dev *ndev) +struct sk_buff *nci_spi_read(struct nci_spi *nspi) { struct sk_buff *skb; - int ret = 0; - - ndev->ops->deassert_int(ndev); /* Retrieve frame from SPI */ - skb = __nci_spi_recv_frame(ndev); - if (!skb) { - ret = -EIO; + skb = __nci_spi_read(nspi); + if (!skb) goto done; - } - if (ndev->acknowledge_mode == NCI_SPI_CRC_ENABLED) { + if (nspi->acknowledge_mode == NCI_SPI_CRC_ENABLED) { if (!nci_spi_check_crc(skb)) { - send_acknowledge(ndev, ACKNOWLEDGE_NACK); + send_acknowledge(nspi, ACKNOWLEDGE_NACK); goto done; } /* In case of acknowledged mode: if ACK or NACK received, * unblock completion of latest frame sent. */ - ndev->req_result = nci_spi_get_ack(skb); - if (ndev->req_result) - complete(&ndev->req_completion); + nspi->req_result = nci_spi_get_ack(skb); + if (nspi->req_result) + complete(&nspi->req_completion); } /* If there is no payload (ACK/NACK only frame), * free the socket buffer */ - if (skb->len == 0) { + if (!skb->len) { kfree_skb(skb); + skb = NULL; goto done; } - if (ndev->acknowledge_mode == NCI_SPI_CRC_ENABLED) - send_acknowledge(ndev, ACKNOWLEDGE_ACK); - - /* Forward skb to NCI core layer */ - ret = nci_recv_frame(ndev->nci_dev, skb); + if (nspi->acknowledge_mode == NCI_SPI_CRC_ENABLED) + send_acknowledge(nspi, ACKNOWLEDGE_ACK); done: - ndev->ops->assert_int(ndev); - return ret; + return skb; } -EXPORT_SYMBOL_GPL(nci_spi_recv_frame); +EXPORT_SYMBOL_GPL(nci_spi_read); diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c index 68063b2..84b7e3e 100644 --- a/net/nfc/netlink.c +++ b/net/nfc/netlink.c @@ -58,6 +58,7 @@ static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = { [NFC_ATTR_LLC_SDP] = { .type = NLA_NESTED }, [NFC_ATTR_FIRMWARE_NAME] = { .type = NLA_STRING, .len = NFC_FIRMWARE_NAME_MAXSIZE }, + [NFC_ATTR_SE_APDU] = { .type = NLA_BINARY }, }; static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = { @@ -1278,6 +1279,91 @@ static int nfc_genl_dump_ses_done(struct netlink_callback *cb) return 0; } +struct se_io_ctx { + u32 dev_idx; + u32 se_idx; +}; + +static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err) +{ + struct se_io_ctx *ctx = context; + struct sk_buff *msg; + void *hdr; + + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!msg) { + kfree(ctx); + return; + } + + hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, + NFC_CMD_SE_IO); + if (!hdr) + goto free_msg; + + if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) || + nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) || + nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu)) + goto nla_put_failure; + + genlmsg_end(msg, hdr); + + genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL); + + kfree(ctx); + + return; + +nla_put_failure: + genlmsg_cancel(msg, hdr); +free_msg: + nlmsg_free(msg); + kfree(ctx); + + return; +} + +static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info) +{ + struct nfc_dev *dev; + struct se_io_ctx *ctx; + u32 dev_idx, se_idx; + u8 *apdu; + size_t apdu_len; + + if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || + !info->attrs[NFC_ATTR_SE_INDEX] || + !info->attrs[NFC_ATTR_SE_APDU]) + return -EINVAL; + + dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); + se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]); + + dev = nfc_get_device(dev_idx); + if (!dev) + return -ENODEV; + + if (!dev->ops || !dev->ops->se_io) + return -ENOTSUPP; + + apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]); + if (apdu_len == 0) + return -EINVAL; + + apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]); + if (!apdu) + return -EINVAL; + + ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->dev_idx = dev_idx; + ctx->se_idx = se_idx; + + return dev->ops->se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx); +} + static struct genl_ops nfc_genl_ops[] = { { .cmd = NFC_CMD_GET_DEVICE, @@ -1358,6 +1444,11 @@ static struct genl_ops nfc_genl_ops[] = { .done = nfc_genl_dump_ses_done, .policy = nfc_genl_policy, }, + { + .cmd = NFC_CMD_SE_IO, + .doit = nfc_genl_se_io, + .policy = nfc_genl_policy, + }, }; diff --git a/net/nfc/rawsock.c b/net/nfc/rawsock.c index 313bf1b..cd958b3 100644 --- a/net/nfc/rawsock.c +++ b/net/nfc/rawsock.c @@ -142,11 +142,11 @@ static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb, err = rawsock_add_header(skb); if (err) - goto error; + goto error_skb; err = sock_queue_rcv_skb(sk, skb); if (err) - goto error; + goto error_skb; spin_lock_bh(&sk->sk_write_queue.lock); if (!skb_queue_empty(&sk->sk_write_queue)) @@ -158,6 +158,9 @@ static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb, sock_put(sk); return; +error_skb: + kfree_skb(skb); + error: rawsock_report_error(sk, err); sock_put(sk); |