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![Andy Shevchenko](/assets/img/avatar_default.png)
Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: David Vrabel <david.vrabel@csr.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
372 lines
10 KiB
C
372 lines
10 KiB
C
/*
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* Ultra Wide Band
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* Address management
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*
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* Copyright (C) 2005-2006 Intel Corporation
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* FIXME: docs
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*/
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/random.h>
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#include <linux/etherdevice.h>
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#include "uwb-internal.h"
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/** Device Address Management command */
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struct uwb_rc_cmd_dev_addr_mgmt {
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struct uwb_rccb rccb;
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u8 bmOperationType;
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u8 baAddr[6];
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} __attribute__((packed));
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/**
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* Low level command for setting/getting UWB radio's addresses
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*
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* @hwarc: HWA Radio Control interface instance
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* @bmOperationType:
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* Set/get, MAC/DEV (see WUSB1.0[8.6.2.2])
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* @baAddr: address buffer--assumed to have enough data to hold
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* the address type requested.
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* @reply: Pointer to reply buffer (can be stack allocated)
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* @returns: 0 if ok, < 0 errno code on error.
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*
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* @cmd has to be allocated because USB cannot grok USB or vmalloc
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* buffers depending on your combination of host architecture.
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*/
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static
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int uwb_rc_dev_addr_mgmt(struct uwb_rc *rc,
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u8 bmOperationType, const u8 *baAddr,
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struct uwb_rc_evt_dev_addr_mgmt *reply)
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{
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int result;
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struct uwb_rc_cmd_dev_addr_mgmt *cmd;
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result = -ENOMEM;
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cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
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if (cmd == NULL)
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goto error_kzalloc;
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cmd->rccb.bCommandType = UWB_RC_CET_GENERAL;
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cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_DEV_ADDR_MGMT);
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cmd->bmOperationType = bmOperationType;
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if (baAddr) {
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size_t size = 0;
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switch (bmOperationType >> 1) {
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case 0: size = 2; break;
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case 1: size = 6; break;
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default: BUG();
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}
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memcpy(cmd->baAddr, baAddr, size);
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}
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reply->rceb.bEventType = UWB_RC_CET_GENERAL;
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reply->rceb.wEvent = UWB_RC_CMD_DEV_ADDR_MGMT;
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result = uwb_rc_cmd(rc, "DEV-ADDR-MGMT",
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&cmd->rccb, sizeof(*cmd),
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&reply->rceb, sizeof(*reply));
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if (result < 0)
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goto error_cmd;
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if (result < sizeof(*reply)) {
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dev_err(&rc->uwb_dev.dev,
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"DEV-ADDR-MGMT: not enough data replied: "
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"%d vs %zu bytes needed\n", result, sizeof(*reply));
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result = -ENOMSG;
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} else if (reply->bResultCode != UWB_RC_RES_SUCCESS) {
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dev_err(&rc->uwb_dev.dev,
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"DEV-ADDR-MGMT: command execution failed: %s (%d)\n",
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uwb_rc_strerror(reply->bResultCode),
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reply->bResultCode);
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result = -EIO;
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} else
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result = 0;
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error_cmd:
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kfree(cmd);
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error_kzalloc:
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return result;
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}
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/**
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* Set the UWB RC MAC or device address.
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*
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* @rc: UWB Radio Controller
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* @_addr: Pointer to address to write [assumed to be either a
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* 'struct uwb_mac_addr *' or a 'struct uwb_dev_addr *'].
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* @type: Type of address to set (UWB_ADDR_DEV or UWB_ADDR_MAC).
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* @returns: 0 if ok, < 0 errno code on error.
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*
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* Some anal retentivity here: even if both 'struct
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* uwb_{dev,mac}_addr' have the actual byte array in the same offset
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* and I could just pass _addr to hwarc_cmd_dev_addr_mgmt(), I prefer
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* to use some syntatic sugar in case someday we decide to change the
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* format of the structs. The compiler will optimize it out anyway.
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*/
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static int uwb_rc_addr_set(struct uwb_rc *rc,
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const void *_addr, enum uwb_addr_type type)
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{
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int result;
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u8 bmOperationType = 0x1; /* Set address */
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const struct uwb_dev_addr *dev_addr = _addr;
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const struct uwb_mac_addr *mac_addr = _addr;
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struct uwb_rc_evt_dev_addr_mgmt reply;
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const u8 *baAddr;
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result = -EINVAL;
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switch (type) {
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case UWB_ADDR_DEV:
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baAddr = dev_addr->data;
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break;
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case UWB_ADDR_MAC:
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baAddr = mac_addr->data;
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bmOperationType |= 0x2;
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break;
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default:
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return result;
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}
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return uwb_rc_dev_addr_mgmt(rc, bmOperationType, baAddr, &reply);
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}
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/**
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* Get the UWB radio's MAC or device address.
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*
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* @rc: UWB Radio Controller
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* @_addr: Where to write the address data [assumed to be either a
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* 'struct uwb_mac_addr *' or a 'struct uwb_dev_addr *'].
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* @type: Type of address to get (UWB_ADDR_DEV or UWB_ADDR_MAC).
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* @returns: 0 if ok (and *_addr set), < 0 errno code on error.
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*
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* See comment in uwb_rc_addr_set() about anal retentivity in the
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* type handling of the address variables.
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*/
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static int uwb_rc_addr_get(struct uwb_rc *rc,
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void *_addr, enum uwb_addr_type type)
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{
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int result;
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u8 bmOperationType = 0x0; /* Get address */
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struct uwb_rc_evt_dev_addr_mgmt evt;
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struct uwb_dev_addr *dev_addr = _addr;
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struct uwb_mac_addr *mac_addr = _addr;
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u8 *baAddr;
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result = -EINVAL;
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switch (type) {
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case UWB_ADDR_DEV:
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baAddr = dev_addr->data;
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break;
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case UWB_ADDR_MAC:
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bmOperationType |= 0x2;
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baAddr = mac_addr->data;
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break;
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default:
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return result;
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}
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result = uwb_rc_dev_addr_mgmt(rc, bmOperationType, baAddr, &evt);
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if (result == 0)
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switch (type) {
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case UWB_ADDR_DEV:
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memcpy(&dev_addr->data, evt.baAddr,
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sizeof(dev_addr->data));
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break;
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case UWB_ADDR_MAC:
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memcpy(&mac_addr->data, evt.baAddr,
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sizeof(mac_addr->data));
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break;
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default: /* shut gcc up */
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BUG();
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}
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return result;
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}
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/** Get @rc's MAC address to @addr */
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int uwb_rc_mac_addr_get(struct uwb_rc *rc,
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struct uwb_mac_addr *addr) {
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return uwb_rc_addr_get(rc, addr, UWB_ADDR_MAC);
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}
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EXPORT_SYMBOL_GPL(uwb_rc_mac_addr_get);
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/** Get @rc's device address to @addr */
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int uwb_rc_dev_addr_get(struct uwb_rc *rc,
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struct uwb_dev_addr *addr) {
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return uwb_rc_addr_get(rc, addr, UWB_ADDR_DEV);
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}
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EXPORT_SYMBOL_GPL(uwb_rc_dev_addr_get);
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/** Set @rc's address to @addr */
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int uwb_rc_mac_addr_set(struct uwb_rc *rc,
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const struct uwb_mac_addr *addr)
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{
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int result = -EINVAL;
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mutex_lock(&rc->uwb_dev.mutex);
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result = uwb_rc_addr_set(rc, addr, UWB_ADDR_MAC);
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mutex_unlock(&rc->uwb_dev.mutex);
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return result;
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}
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/** Set @rc's address to @addr */
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int uwb_rc_dev_addr_set(struct uwb_rc *rc,
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const struct uwb_dev_addr *addr)
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{
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int result = -EINVAL;
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mutex_lock(&rc->uwb_dev.mutex);
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result = uwb_rc_addr_set(rc, addr, UWB_ADDR_DEV);
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rc->uwb_dev.dev_addr = *addr;
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mutex_unlock(&rc->uwb_dev.mutex);
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return result;
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}
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/* Returns !0 if given address is already assigned to device. */
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int __uwb_mac_addr_assigned_check(struct device *dev, void *_addr)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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struct uwb_mac_addr *addr = _addr;
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if (!uwb_mac_addr_cmp(addr, &uwb_dev->mac_addr))
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return !0;
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return 0;
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}
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/* Returns !0 if given address is already assigned to device. */
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int __uwb_dev_addr_assigned_check(struct device *dev, void *_addr)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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struct uwb_dev_addr *addr = _addr;
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if (!uwb_dev_addr_cmp(addr, &uwb_dev->dev_addr))
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return !0;
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return 0;
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}
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/**
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* uwb_dev_addr_assign - assigned a generated DevAddr to a radio controller
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* @rc: the (local) radio controller device requiring a new DevAddr
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*
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* A new DevAddr is required when:
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* - first setting up a radio controller
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* - if the hardware reports a DevAddr conflict
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*
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* The DevAddr is randomly generated in the generated DevAddr range
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* [0x100, 0xfeff]. The number of devices in a beacon group is limited
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* by mMaxBPLength (96) so this address space will never be exhausted.
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*
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* [ECMA-368] 17.1.1, 17.16.
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*/
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int uwb_rc_dev_addr_assign(struct uwb_rc *rc)
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{
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struct uwb_dev_addr new_addr;
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do {
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get_random_bytes(new_addr.data, sizeof(new_addr.data));
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} while (new_addr.data[0] == 0x00 || new_addr.data[0] == 0xff
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|| __uwb_dev_addr_assigned(rc, &new_addr));
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return uwb_rc_dev_addr_set(rc, &new_addr);
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}
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/**
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* uwbd_evt_handle_rc_dev_addr_conflict - handle a DEV_ADDR_CONFLICT event
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* @evt: the DEV_ADDR_CONFLICT notification from the radio controller
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*
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* A new (non-conflicting) DevAddr is assigned to the radio controller.
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*
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* [ECMA-368] 17.1.1.1.
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*/
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int uwbd_evt_handle_rc_dev_addr_conflict(struct uwb_event *evt)
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{
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struct uwb_rc *rc = evt->rc;
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return uwb_rc_dev_addr_assign(rc);
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}
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/*
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* Print the 48-bit EUI MAC address of the radio controller when
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* reading /sys/class/uwb_rc/XX/mac_address
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*/
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static ssize_t uwb_rc_mac_addr_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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struct uwb_rc *rc = uwb_dev->rc;
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struct uwb_mac_addr addr;
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ssize_t result;
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mutex_lock(&rc->uwb_dev.mutex);
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result = uwb_rc_addr_get(rc, &addr, UWB_ADDR_MAC);
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mutex_unlock(&rc->uwb_dev.mutex);
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if (result >= 0) {
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result = uwb_mac_addr_print(buf, UWB_ADDR_STRSIZE, &addr);
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buf[result++] = '\n';
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}
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return result;
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}
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/*
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* Parse a 48 bit address written to /sys/class/uwb_rc/XX/mac_address
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* and if correct, set it.
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*/
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static ssize_t uwb_rc_mac_addr_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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struct uwb_rc *rc = uwb_dev->rc;
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struct uwb_mac_addr addr;
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ssize_t result;
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result = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx\n",
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&addr.data[0], &addr.data[1], &addr.data[2],
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&addr.data[3], &addr.data[4], &addr.data[5]);
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if (result != 6) {
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result = -EINVAL;
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goto out;
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}
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if (is_multicast_ether_addr(addr.data)) {
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dev_err(&rc->uwb_dev.dev, "refusing to set multicast "
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"MAC address %s\n", buf);
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result = -EINVAL;
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goto out;
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}
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result = uwb_rc_mac_addr_set(rc, &addr);
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if (result == 0)
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rc->uwb_dev.mac_addr = addr;
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out:
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return result < 0 ? result : size;
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}
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DEVICE_ATTR(mac_address, S_IRUGO | S_IWUSR, uwb_rc_mac_addr_show, uwb_rc_mac_addr_store);
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/** Print @addr to @buf, @return bytes written */
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size_t __uwb_addr_print(char *buf, size_t buf_size, const unsigned char *addr,
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int type)
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{
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size_t result;
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if (type)
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result = scnprintf(buf, buf_size, "%pM", addr);
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else
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result = scnprintf(buf, buf_size, "%02x:%02x",
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addr[1], addr[0]);
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return result;
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}
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EXPORT_SYMBOL_GPL(__uwb_addr_print);
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