net/wireless/sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * This file provides /sys/class/ieee80211/<wiphy name>/
   4  * and some default attributes.
   5  *
   6  * Copyright 2005-2006  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2006       Johannes Berg <johannes@sipsolutions.net>
   8  * Copyright (C) 2020-2021 Intel Corporation
   9  */
  10
  11 #include <linux/device.h>
  12 #include <linux/module.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/nl80211.h>
  15 #include <linux/rtnetlink.h>
  16 #include <net/cfg80211.h>
  17 #include "sysfs.h"
  18 #include "core.h"
  19 #include "rdev-ops.h"
  20
  21 static inline struct cfg80211_registered_device *dev_to_rdev(
  22         struct device *dev)
  23 {
  24         return container_of(dev, struct cfg80211_registered_device, wiphy.dev);
  25 }
  26
  27 #define SHOW_FMT(name, fmt, member)                                     \
  28 static ssize_t name ## _show(struct device *dev,                        \
  29                               struct device_attribute *attr,            \
  30                               char *buf)                                \
  31 {                                                                       \
  32         return sprintf(buf, fmt "\n", dev_to_rdev(dev)->member);        \
  33 }                                                                       \
  34 static DEVICE_ATTR_RO(name)
  35
  36 SHOW_FMT(index, "%d", wiphy_idx);
  37 SHOW_FMT(macaddress, "%pM", wiphy.perm_addr);
  38 SHOW_FMT(address_mask, "%pM", wiphy.addr_mask);
  39
  40 static ssize_t name_show(struct device *dev,
  41                          struct device_attribute *attr,
  42                          char *buf)
  43 {
  44         struct wiphy *wiphy = &dev_to_rdev(dev)->wiphy;
  45
  46         return sprintf(buf, "%s\n", wiphy_name(wiphy));
  47 }
  48 static DEVICE_ATTR_RO(name);
  49
  50 static ssize_t addresses_show(struct device *dev,
  51                               struct device_attribute *attr,
  52                               char *buf)
  53 {
  54         struct wiphy *wiphy = &dev_to_rdev(dev)->wiphy;
  55         char *start = buf;
  56         int i;
  57
  58         if (!wiphy->addresses)
  59                 return sprintf(buf, "%pM\n", wiphy->perm_addr);
  60
  61         for (i = 0; i < wiphy->n_addresses; i++)
  62                 buf += sprintf(buf, "%pM\n", wiphy->addresses[i].addr);
  63
  64         return buf - start;
  65 }
  66 static DEVICE_ATTR_RO(addresses);
  67
  68 static struct attribute *ieee80211_attrs[] = {
  69         &dev_attr_index.attr,
  70         &dev_attr_macaddress.attr,
  71         &dev_attr_address_mask.attr,
  72         &dev_attr_addresses.attr,
  73         &dev_attr_name.attr,
  74         NULL,
  75 };
  76 ATTRIBUTE_GROUPS(ieee80211);
  77
  78 static void wiphy_dev_release(struct device *dev)
  79 {
  80         struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
  81
  82         cfg80211_dev_free(rdev);
  83 }
  84
  85 #ifdef CONFIG_PM_SLEEP
  86 static void cfg80211_leave_all(struct cfg80211_registered_device *rdev)
  87 {
  88         struct wireless_dev *wdev;
  89
  90         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
  91                 cfg80211_leave(rdev, wdev);
  92 }
  93
  94 static int wiphy_suspend(struct device *dev)
  95 {
  96         struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
  97         int ret = 0;
  98
  99         rdev->suspend_at = ktime_get_boottime_seconds();
 100
 101         rtnl_lock();
 102         wiphy_lock(&rdev->wiphy);
 103         if (rdev->wiphy.registered) {
 104                 if (!rdev->wiphy.wowlan_config) {
 105                         cfg80211_leave_all(rdev);
 106                         cfg80211_process_rdev_events(rdev);
 107                 }
 108                 if (rdev->ops->suspend)
 109                         ret = rdev_suspend(rdev, rdev->wiphy.wowlan_config);
 110                 if (ret == 1) {
 111                         /* Driver refuse to configure wowlan */
 112                         cfg80211_leave_all(rdev);
 113                         cfg80211_process_rdev_events(rdev);
 114                         ret = rdev_suspend(rdev, NULL);
 115                 }
 116         }
 117         wiphy_unlock(&rdev->wiphy);
 118         rtnl_unlock();
 119
 120         return ret;
 121 }
 122
 123 static int wiphy_resume(struct device *dev)
 124 {
 125         struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
 126         int ret = 0;
 127
 128         /* Age scan results with time spent in suspend */
 129         cfg80211_bss_age(rdev, ktime_get_boottime_seconds() - rdev->suspend_at);
 130
 131         rtnl_lock();
 132         wiphy_lock(&rdev->wiphy);
 133         if (rdev->wiphy.registered && rdev->ops->resume)
 134                 ret = rdev_resume(rdev);
 135         wiphy_unlock(&rdev->wiphy);
 136
 137         if (ret)
 138                 cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 139
 140         rtnl_unlock();
 141
 142         return ret;
 143 }
 144
 145 static SIMPLE_DEV_PM_OPS(wiphy_pm_ops, wiphy_suspend, wiphy_resume);
 146 #define WIPHY_PM_OPS (&wiphy_pm_ops)
 147 #else
 148 #define WIPHY_PM_OPS NULL
 149 #endif
 150
 151 static const void *wiphy_namespace(struct device *d)
 152 {
 153         struct wiphy *wiphy = container_of(d, struct wiphy, dev);
 154
 155         return wiphy_net(wiphy);
 156 }
 157
 158 struct class ieee80211_class = {
 159         .name = "ieee80211",
 160         .owner = THIS_MODULE,
 161         .dev_release = wiphy_dev_release,
 162         .dev_groups = ieee80211_groups,
 163         .pm = WIPHY_PM_OPS,
 164         .ns_type = &net_ns_type_operations,
 165         .namespace = wiphy_namespace,
 166 };
 167
 168 int wiphy_sysfs_init(void)
 169 {
 170         return class_register(&ieee80211_class);
 171 }
 172
 173 void wiphy_sysfs_exit(void)
 174 {
 175         class_unregister(&ieee80211_class);
 176 }