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 
dev_to_rdev(struct device * dev)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 
name_show(struct device * dev,struct device_attribute * attr,char * buf)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 
addresses_show(struct device * dev,struct device_attribute * attr,char * buf)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 
wiphy_dev_release(struct device * dev)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
cfg80211_leave_all(struct cfg80211_registered_device * rdev)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 
wiphy_suspend(struct device * dev)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 
wiphy_resume(struct device * dev)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 
wiphy_namespace(struct device * d)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 
wiphy_sysfs_init(void)168 int wiphy_sysfs_init(void)
169 {
170 	return class_register(&ieee80211_class);
171 }
172 
wiphy_sysfs_exit(void)173 void wiphy_sysfs_exit(void)
174 {
175 	class_unregister(&ieee80211_class);
176 }
177