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reg.c
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/*
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2008-2011 Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/**
* DOC: Wireless regulatory infrastructure
*
* The usual implementation is for a driver to read a device EEPROM to
* determine which regulatory domain it should be operating under, then
* looking up the allowable channels in a driver-local table and finally
* registering those channels in the wiphy structure.
*
* Another set of compliance enforcement is for drivers to use their
* own compliance limits which can be stored on the EEPROM. The host
* driver or firmware may ensure these are used.
*
* In addition to all this we provide an extra layer of regulatory
* conformance. For drivers which do not have any regulatory
* information CRDA provides the complete regulatory solution.
* For others it provides a community effort on further restrictions
* to enhance compliance.
*
* Note: When number of rules --> infinity we will not be able to
* index on alpha2 any more, instead we'll probably have to
* rely on some SHA1 checksum of the regdomain for example.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/ctype.h>
#include <linux/nl80211.h>
#include <linux/platform_device.h>
#include <linux/moduleparam.h>
#include <net/cfg80211.h>
#include "core.h"
#include "reg.h"
#include "regdb.h"
#include "nl80211.h"
#ifdef CONFIG_CFG80211_REG_DEBUG
#define REG_DBG_PRINT(format, args...) \
printk(KERN_DEBUG pr_fmt(format), ##args)
#else
#define REG_DBG_PRINT(args...)
#endif
enum reg_request_treatment {
REG_REQ_OK,
REG_REQ_IGNORE,
REG_REQ_INTERSECT,
REG_REQ_ALREADY_SET,
};
static struct regulatory_request core_request_world = {
.initiator = NL80211_REGDOM_SET_BY_CORE,
.alpha2[0] = '0',
.alpha2[1] = '0',
.intersect = false,
.processed = true,
.country_ie_env = ENVIRON_ANY,
};
/*
* Receipt of information from last regulatory request,
* protected by RTNL (and can be accessed with RCU protection)
*/
static struct regulatory_request __rcu *last_request =
(void __rcu *)&core_request_world;
/* To trigger userspace events */
static struct platform_device *reg_pdev;
static struct device_type reg_device_type = {
.uevent = reg_device_uevent,
};
/*
* Central wireless core regulatory domains, we only need two,
* the current one and a world regulatory domain in case we have no
* information to give us an alpha2.
* (protected by RTNL, can be read under RCU)
*/
const struct ieee80211_regdomain __rcu *cfg80211_regdomain;
/*
* Number of devices that registered to the core
* that support cellular base station regulatory hints
* (protected by RTNL)
*/
static int reg_num_devs_support_basehint;
static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
{
return rtnl_dereference(cfg80211_regdomain);
}
static const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy)
{
return rtnl_dereference(wiphy->regd);
}
static void rcu_free_regdom(const struct ieee80211_regdomain *r)
{
if (!r)
return;
kfree_rcu((struct ieee80211_regdomain *)r, rcu_head);
}
static struct regulatory_request *get_last_request(void)
{
return rcu_dereference_rtnl(last_request);
}
/* Used to queue up regulatory hints */
static LIST_HEAD(reg_requests_list);
static spinlock_t reg_requests_lock;
/* Used to queue up beacon hints for review */
static LIST_HEAD(reg_pending_beacons);
static spinlock_t reg_pending_beacons_lock;
/* Used to keep track of processed beacon hints */
static LIST_HEAD(reg_beacon_list);
struct reg_beacon {
struct list_head list;
struct ieee80211_channel chan;
};
static void reg_todo(struct work_struct *work);
static DECLARE_WORK(reg_work, reg_todo);
static void reg_timeout_work(struct work_struct *work);
static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
/* We keep a static world regulatory domain in case of the absence of CRDA */
static const struct ieee80211_regdomain world_regdom = {
.n_reg_rules = 6,
.alpha2 = "00",
.reg_rules = {
/* IEEE 802.11b/g, channels 1..11 */
REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
/* IEEE 802.11b/g, channels 12..13. */
REG_RULE(2467-10, 2472+10, 40, 6, 20,
NL80211_RRF_PASSIVE_SCAN |
NL80211_RRF_NO_IBSS),
/* IEEE 802.11 channel 14 - Only JP enables
* this and for 802.11b only */
REG_RULE(2484-10, 2484+10, 20, 6, 20,
NL80211_RRF_PASSIVE_SCAN |
NL80211_RRF_NO_IBSS |
NL80211_RRF_NO_OFDM),
/* IEEE 802.11a, channel 36..48 */
REG_RULE(5180-10, 5240+10, 80, 6, 20,
NL80211_RRF_PASSIVE_SCAN |
NL80211_RRF_NO_IBSS),
/* NB: 5260 MHz - 5700 MHz requires DFS */
/* IEEE 802.11a, channel 149..165 */
REG_RULE(5745-10, 5825+10, 80, 6, 20,
NL80211_RRF_PASSIVE_SCAN |
NL80211_RRF_NO_IBSS),
/* IEEE 802.11ad (60gHz), channels 1..3 */
REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
}
};
/* protected by RTNL */
static const struct ieee80211_regdomain *cfg80211_world_regdom =
&world_regdom;
static char *ieee80211_regdom = "00";
static char user_alpha2[2];
module_param(ieee80211_regdom, charp, 0444);
MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
static void reset_regdomains(bool full_reset,
const struct ieee80211_regdomain *new_regdom)
{
const struct ieee80211_regdomain *r;
struct regulatory_request *lr;
ASSERT_RTNL();
r = get_cfg80211_regdom();
/* avoid freeing static information or freeing something twice */
if (r == cfg80211_world_regdom)
r = NULL;
if (cfg80211_world_regdom == &world_regdom)
cfg80211_world_regdom = NULL;
if (r == &world_regdom)
r = NULL;
rcu_free_regdom(r);
rcu_free_regdom(cfg80211_world_regdom);
cfg80211_world_regdom = &world_regdom;
rcu_assign_pointer(cfg80211_regdomain, new_regdom);
if (!full_reset)
return;
lr = get_last_request();
if (lr != &core_request_world && lr)
kfree_rcu(lr, rcu_head);
rcu_assign_pointer(last_request, &core_request_world);
}
/*
* Dynamic world regulatory domain requested by the wireless
* core upon initialization
*/
static void update_world_regdomain(const struct ieee80211_regdomain *rd)
{
struct regulatory_request *lr;
lr = get_last_request();
WARN_ON(!lr);
reset_regdomains(false, rd);
cfg80211_world_regdom = rd;
}
bool is_world_regdom(const char *alpha2)
{
if (!alpha2)
return false;
return alpha2[0] == '0' && alpha2[1] == '0';
}
static bool is_alpha2_set(const char *alpha2)
{
if (!alpha2)
return false;
return alpha2[0] && alpha2[1];
}
static bool is_unknown_alpha2(const char *alpha2)
{
if (!alpha2)
return false;
/*
* Special case where regulatory domain was built by driver
* but a specific alpha2 cannot be determined
*/
return alpha2[0] == '9' && alpha2[1] == '9';
}
static bool is_intersected_alpha2(const char *alpha2)
{
if (!alpha2)
return false;
/*
* Special case where regulatory domain is the
* result of an intersection between two regulatory domain
* structures
*/
return alpha2[0] == '9' && alpha2[1] == '8';
}
static bool is_an_alpha2(const char *alpha2)
{
if (!alpha2)
return false;
return isalpha(alpha2[0]) && isalpha(alpha2[1]);
}
static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
{
if (!alpha2_x || !alpha2_y)
return false;
return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1];
}
static bool regdom_changes(const char *alpha2)
{
const struct ieee80211_regdomain *r = get_cfg80211_regdom();
if (!r)
return true;
return !alpha2_equal(r->alpha2, alpha2);
}
/*
* The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
* you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
* has ever been issued.
*/
static bool is_user_regdom_saved(void)
{
if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
return false;
/* This would indicate a mistake on the design */
if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2),
"Unexpected user alpha2: %c%c\n",
user_alpha2[0], user_alpha2[1]))
return false;
return true;
}
static const struct ieee80211_regdomain *
reg_copy_regd(const struct ieee80211_regdomain *src_regd)
{
struct ieee80211_regdomain *regd;
int size_of_regd;
unsigned int i;
size_of_regd =
sizeof(struct ieee80211_regdomain) +
src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule);
regd = kzalloc(size_of_regd, GFP_KERNEL);
if (!regd)
return ERR_PTR(-ENOMEM);
memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
for (i = 0; i < src_regd->n_reg_rules; i++)
memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
sizeof(struct ieee80211_reg_rule));
return regd;
}
#ifdef CONFIG_CFG80211_INTERNAL_REGDB
struct reg_regdb_search_request {
char alpha2[2];
struct list_head list;
};
static LIST_HEAD(reg_regdb_search_list);
static DEFINE_MUTEX(reg_regdb_search_mutex);
static void reg_regdb_search(struct work_struct *work)
{
struct reg_regdb_search_request *request;
const struct ieee80211_regdomain *curdom, *regdom = NULL;
int i;
rtnl_lock();
mutex_lock(®_regdb_search_mutex);
while (!list_empty(®_regdb_search_list)) {
request = list_first_entry(®_regdb_search_list,
struct reg_regdb_search_request,
list);
list_del(&request->list);
for (i = 0; i < reg_regdb_size; i++) {
curdom = reg_regdb[i];
if (alpha2_equal(request->alpha2, curdom->alpha2)) {
regdom = reg_copy_regd(curdom);
break;
}
}
kfree(request);
}
mutex_unlock(®_regdb_search_mutex);
if (!IS_ERR_OR_NULL(regdom))
set_regdom(regdom);
rtnl_unlock();
}
static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
static void reg_regdb_query(const char *alpha2)
{
struct reg_regdb_search_request *request;
if (!alpha2)
return;
request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
if (!request)
return;
memcpy(request->alpha2, alpha2, 2);
mutex_lock(®_regdb_search_mutex);
list_add_tail(&request->list, ®_regdb_search_list);
mutex_unlock(®_regdb_search_mutex);
schedule_work(®_regdb_work);
}
/* Feel free to add any other sanity checks here */
static void reg_regdb_size_check(void)
{
/* We should ideally BUILD_BUG_ON() but then random builds would fail */
WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it...");
}
#else
static inline void reg_regdb_size_check(void) {}
static inline void reg_regdb_query(const char *alpha2) {}
#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
/*
* This lets us keep regulatory code which is updated on a regulatory
* basis in userspace. Country information is filled in by
* reg_device_uevent
*/
static int call_crda(const char *alpha2)
{
if (!is_world_regdom((char *) alpha2))
pr_info("Calling CRDA for country: %c%c\n",
alpha2[0], alpha2[1]);
else
pr_info("Calling CRDA to update world regulatory domain\n");
/* query internal regulatory database (if it exists) */
reg_regdb_query(alpha2);
return kobject_uevent(®_pdev->dev.kobj, KOBJ_CHANGE);
}
static bool reg_is_valid_request(const char *alpha2)
{
struct regulatory_request *lr = get_last_request();
if (!lr || lr->processed)
return false;
return alpha2_equal(lr->alpha2, alpha2);
}
/* Sanity check on a regulatory rule */
static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
{
const struct ieee80211_freq_range *freq_range = &rule->freq_range;
u32 freq_diff;
if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
return false;
if (freq_range->start_freq_khz > freq_range->end_freq_khz)
return false;
freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
freq_range->max_bandwidth_khz > freq_diff)
return false;
return true;
}
static bool is_valid_rd(const struct ieee80211_regdomain *rd)
{
const struct ieee80211_reg_rule *reg_rule = NULL;
unsigned int i;
if (!rd->n_reg_rules)
return false;
if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
return false;
for (i = 0; i < rd->n_reg_rules; i++) {
reg_rule = &rd->reg_rules[i];
if (!is_valid_reg_rule(reg_rule))
return false;
}
return true;
}
static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
u32 center_freq_khz, u32 bw_khz)
{
u32 start_freq_khz, end_freq_khz;
start_freq_khz = center_freq_khz - (bw_khz/2);
end_freq_khz = center_freq_khz + (bw_khz/2);
if (start_freq_khz >= freq_range->start_freq_khz &&
end_freq_khz <= freq_range->end_freq_khz)
return true;
return false;
}
/**
* freq_in_rule_band - tells us if a frequency is in a frequency band
* @freq_range: frequency rule we want to query
* @freq_khz: frequency we are inquiring about
*
* This lets us know if a specific frequency rule is or is not relevant to
* a specific frequency's band. Bands are device specific and artificial
* definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
* however it is safe for now to assume that a frequency rule should not be
* part of a frequency's band if the start freq or end freq are off by more
* than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
* 60 GHz band.
* This resolution can be lowered and should be considered as we add
* regulatory rule support for other "bands".
**/
static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
u32 freq_khz)
{
#define ONE_GHZ_IN_KHZ 1000000
/*
* From 802.11ad: directional multi-gigabit (DMG):
* Pertaining to operation in a frequency band containing a channel
* with the Channel starting frequency above 45 GHz.
*/
u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
return true;
if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
return true;
return false;
#undef ONE_GHZ_IN_KHZ
}
/*
* Helper for regdom_intersect(), this does the real
* mathematical intersection fun
*/
static int reg_rules_intersect(const struct ieee80211_reg_rule *rule1,
const struct ieee80211_reg_rule *rule2,
struct ieee80211_reg_rule *intersected_rule)
{
const struct ieee80211_freq_range *freq_range1, *freq_range2;
struct ieee80211_freq_range *freq_range;
const struct ieee80211_power_rule *power_rule1, *power_rule2;
struct ieee80211_power_rule *power_rule;
u32 freq_diff;
freq_range1 = &rule1->freq_range;
freq_range2 = &rule2->freq_range;
freq_range = &intersected_rule->freq_range;
power_rule1 = &rule1->power_rule;
power_rule2 = &rule2->power_rule;
power_rule = &intersected_rule->power_rule;
freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
freq_range2->start_freq_khz);
freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
freq_range2->end_freq_khz);
freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
freq_range2->max_bandwidth_khz);
freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
if (freq_range->max_bandwidth_khz > freq_diff)
freq_range->max_bandwidth_khz = freq_diff;
power_rule->max_eirp = min(power_rule1->max_eirp,
power_rule2->max_eirp);
power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
power_rule2->max_antenna_gain);
intersected_rule->flags = rule1->flags | rule2->flags;
if (!is_valid_reg_rule(intersected_rule))
return -EINVAL;
return 0;
}
/**
* regdom_intersect - do the intersection between two regulatory domains
* @rd1: first regulatory domain
* @rd2: second regulatory domain
*
* Use this function to get the intersection between two regulatory domains.
* Once completed we will mark the alpha2 for the rd as intersected, "98",
* as no one single alpha2 can represent this regulatory domain.
*
* Returns a pointer to the regulatory domain structure which will hold the
* resulting intersection of rules between rd1 and rd2. We will
* kzalloc() this structure for you.
*/
static struct ieee80211_regdomain *
regdom_intersect(const struct ieee80211_regdomain *rd1,
const struct ieee80211_regdomain *rd2)
{
int r, size_of_regd;
unsigned int x, y;
unsigned int num_rules = 0, rule_idx = 0;
const struct ieee80211_reg_rule *rule1, *rule2;
struct ieee80211_reg_rule *intersected_rule;
struct ieee80211_regdomain *rd;
/* This is just a dummy holder to help us count */
struct ieee80211_reg_rule dummy_rule;
if (!rd1 || !rd2)
return NULL;
/*
* First we get a count of the rules we'll need, then we actually
* build them. This is to so we can malloc() and free() a
* regdomain once. The reason we use reg_rules_intersect() here
* is it will return -EINVAL if the rule computed makes no sense.
* All rules that do check out OK are valid.
*/
for (x = 0; x < rd1->n_reg_rules; x++) {
rule1 = &rd1->reg_rules[x];
for (y = 0; y < rd2->n_reg_rules; y++) {
rule2 = &rd2->reg_rules[y];
if (!reg_rules_intersect(rule1, rule2, &dummy_rule))
num_rules++;
}
}
if (!num_rules)
return NULL;
size_of_regd = sizeof(struct ieee80211_regdomain) +
num_rules * sizeof(struct ieee80211_reg_rule);
rd = kzalloc(size_of_regd, GFP_KERNEL);
if (!rd)
return NULL;
for (x = 0; x < rd1->n_reg_rules && rule_idx < num_rules; x++) {
rule1 = &rd1->reg_rules[x];
for (y = 0; y < rd2->n_reg_rules && rule_idx < num_rules; y++) {
rule2 = &rd2->reg_rules[y];
/*
* This time around instead of using the stack lets
* write to the target rule directly saving ourselves
* a memcpy()
*/
intersected_rule = &rd->reg_rules[rule_idx];
r = reg_rules_intersect(rule1, rule2, intersected_rule);
/*
* No need to memset here the intersected rule here as
* we're not using the stack anymore
*/
if (r)
continue;
rule_idx++;
}
}
if (rule_idx != num_rules) {
kfree(rd);
return NULL;
}
rd->n_reg_rules = num_rules;
rd->alpha2[0] = '9';
rd->alpha2[1] = '8';
return rd;
}
/*
* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
* want to just have the channel structure use these
*/
static u32 map_regdom_flags(u32 rd_flags)
{
u32 channel_flags = 0;
if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
if (rd_flags & NL80211_RRF_NO_IBSS)
channel_flags |= IEEE80211_CHAN_NO_IBSS;
if (rd_flags & NL80211_RRF_DFS)
channel_flags |= IEEE80211_CHAN_RADAR;
if (rd_flags & NL80211_RRF_NO_OFDM)
channel_flags |= IEEE80211_CHAN_NO_OFDM;
return channel_flags;
}
static const struct ieee80211_reg_rule *
freq_reg_info_regd(struct wiphy *wiphy, u32 center_freq,
const struct ieee80211_regdomain *regd)
{
int i;
bool band_rule_found = false;
bool bw_fits = false;
if (!regd)
return ERR_PTR(-EINVAL);
for (i = 0; i < regd->n_reg_rules; i++) {
const struct ieee80211_reg_rule *rr;
const struct ieee80211_freq_range *fr = NULL;
rr = ®d->reg_rules[i];
fr = &rr->freq_range;
/*
* We only need to know if one frequency rule was
* was in center_freq's band, that's enough, so lets
* not overwrite it once found
*/
if (!band_rule_found)
band_rule_found = freq_in_rule_band(fr, center_freq);
bw_fits = reg_does_bw_fit(fr, center_freq, MHZ_TO_KHZ(20));
if (band_rule_found && bw_fits)
return rr;
}
if (!band_rule_found)
return ERR_PTR(-ERANGE);
return ERR_PTR(-EINVAL);
}
const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
u32 center_freq)
{
const struct ieee80211_regdomain *regd;
struct regulatory_request *lr = get_last_request();
/*
* Follow the driver's regulatory domain, if present, unless a country
* IE has been processed or a user wants to help complaince further
*/
if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
lr->initiator != NL80211_REGDOM_SET_BY_USER &&
wiphy->regd)
regd = get_wiphy_regdom(wiphy);
else
regd = get_cfg80211_regdom();
return freq_reg_info_regd(wiphy, center_freq, regd);
}
EXPORT_SYMBOL(freq_reg_info);
#ifdef CONFIG_CFG80211_REG_DEBUG
static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
{
switch (initiator) {
case NL80211_REGDOM_SET_BY_CORE:
return "Set by core";
case NL80211_REGDOM_SET_BY_USER:
return "Set by user";
case NL80211_REGDOM_SET_BY_DRIVER:
return "Set by driver";
case NL80211_REGDOM_SET_BY_COUNTRY_IE:
return "Set by country IE";
default:
WARN_ON(1);
return "Set by bug";
}
}
static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
const struct ieee80211_reg_rule *reg_rule)
{
const struct ieee80211_power_rule *power_rule;
const struct ieee80211_freq_range *freq_range;
char max_antenna_gain[32];
power_rule = ®_rule->power_rule;
freq_range = ®_rule->freq_range;
if (!power_rule->max_antenna_gain)
snprintf(max_antenna_gain, 32, "N/A");
else
snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
REG_DBG_PRINT("Updating information on frequency %d MHz with regulatory rule:\n",
chan->center_freq);
REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n",
freq_range->start_freq_khz, freq_range->end_freq_khz,
freq_range->max_bandwidth_khz, max_antenna_gain,
power_rule->max_eirp);
}
#else
static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
const struct ieee80211_reg_rule *reg_rule)
{
return;
}
#endif
/*
* Note that right now we assume the desired channel bandwidth
* is always 20 MHz for each individual channel (HT40 uses 20 MHz
* per channel, the primary and the extension channel).
*/
static void handle_channel(struct wiphy *wiphy,
enum nl80211_reg_initiator initiator,
struct ieee80211_channel *chan)
{
u32 flags, bw_flags = 0;
const struct ieee80211_reg_rule *reg_rule = NULL;
const struct ieee80211_power_rule *power_rule = NULL;
const struct ieee80211_freq_range *freq_range = NULL;
struct wiphy *request_wiphy = NULL;
struct regulatory_request *lr = get_last_request();
request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
flags = chan->orig_flags;
reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
if (IS_ERR(reg_rule)) {
/*
* We will disable all channels that do not match our
* received regulatory rule unless the hint is coming
* from a Country IE and the Country IE had no information
* about a band. The IEEE 802.11 spec allows for an AP
* to send only a subset of the regulatory rules allowed,
* so an AP in the US that only supports 2.4 GHz may only send
* a country IE with information for the 2.4 GHz band
* while 5 GHz is still supported.
*/
if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
PTR_ERR(reg_rule) == -ERANGE)
return;
REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
chan->flags |= IEEE80211_CHAN_DISABLED;
return;
}
chan_reg_rule_print_dbg(chan, reg_rule);
power_rule = ®_rule->power_rule;
freq_range = ®_rule->freq_range;
if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
bw_flags = IEEE80211_CHAN_NO_HT40;
if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(80))
bw_flags |= IEEE80211_CHAN_NO_80MHZ;
if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(160))
bw_flags |= IEEE80211_CHAN_NO_160MHZ;
if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
request_wiphy && request_wiphy == wiphy &&
request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
/*
* This guarantees the driver's requested regulatory domain
* will always be used as a base for further regulatory
* settings
*/
chan->flags = chan->orig_flags =
map_regdom_flags(reg_rule->flags) | bw_flags;
chan->max_antenna_gain = chan->orig_mag =
(int) MBI_TO_DBI(power_rule->max_antenna_gain);
chan->max_reg_power = chan->max_power = chan->orig_mpwr =
(int) MBM_TO_DBM(power_rule->max_eirp);
return;
}
chan->dfs_state = NL80211_DFS_USABLE;
chan->dfs_state_entered = jiffies;
chan->beacon_found = false;
chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
chan->max_antenna_gain =
min_t(int, chan->orig_mag,
MBI_TO_DBI(power_rule->max_antenna_gain));
chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
if (chan->orig_mpwr) {
/*
* Devices that have their own custom regulatory domain
* but also use WIPHY_FLAG_STRICT_REGULATORY will follow the
* passed country IE power settings.
*/
if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY &&
wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
chan->max_power = chan->max_reg_power;
else
chan->max_power = min(chan->orig_mpwr,
chan->max_reg_power);
} else
chan->max_power = chan->max_reg_power;
}
static void handle_band(struct wiphy *wiphy,
enum nl80211_reg_initiator initiator,
struct ieee80211_supported_band *sband)
{
unsigned int i;
if (!sband)
return;
for (i = 0; i < sband->n_channels; i++)
handle_channel(wiphy, initiator, &sband->channels[i]);
}
static bool reg_request_cell_base(struct regulatory_request *request)
{
if (request->initiator != NL80211_REGDOM_SET_BY_USER)
return false;
return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
}
bool reg_last_request_cell_base(void)
{
return reg_request_cell_base(get_last_request());
}
#ifdef CONFIG_CFG80211_CERTIFICATION_ONUS
/* Core specific check */
static enum reg_request_treatment
reg_ignore_cell_hint(struct regulatory_request *pending_request)
{
struct regulatory_request *lr = get_last_request();
if (!reg_num_devs_support_basehint)
return REG_REQ_IGNORE;
if (reg_request_cell_base(lr) &&
!regdom_changes(pending_request->alpha2))
return REG_REQ_ALREADY_SET;
return REG_REQ_OK;
}
/* Device specific check */
static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
{
return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
}
#else
static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
{
return REG_REQ_IGNORE;
}
static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
{
return true;
}
#endif
static bool ignore_reg_update(struct wiphy *wiphy,
enum nl80211_reg_initiator initiator)
{
struct regulatory_request *lr = get_last_request();
if (!lr) {
REG_DBG_PRINT("Ignoring regulatory request %s since last_request is not set\n",
reg_initiator_name(initiator));
return true;
}
if (initiator == NL80211_REGDOM_SET_BY_CORE &&
wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
REG_DBG_PRINT("Ignoring regulatory request %s since the driver uses its own custom regulatory domain\n",
reg_initiator_name(initiator));
return true;
}
/*
* wiphy->regd will be set once the device has its own
* desired regulatory domain set
*/
if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
!is_world_regdom(lr->alpha2)) {
REG_DBG_PRINT("Ignoring regulatory request %s since the driver requires its own regulatory domain to be set first\n",
reg_initiator_name(initiator));
return true;
}
if (reg_request_cell_base(lr))
return reg_dev_ignore_cell_hint(wiphy);
return false;
}