*/
const struct ieee80211_regdomain *cfg80211_regdomain;
-/*
- * We use this as a place for the rd structure built from the
- * last parsed country IE to rest until CRDA gets back to us with
- * what it thinks should apply for the same country
- */
-static const struct ieee80211_regdomain *country_ie_regdomain;
-
/*
* Protects static reg.c components:
* - cfg80211_world_regdom
* - cfg80211_regdom
- * - country_ie_regdomain
* - last_request
*/
static DEFINE_MUTEX(reg_mutex);
return true;
}
-/**
- * country_ie_integrity_changes - tells us if the country IE has changed
- * @checksum: checksum of country IE of fields we are interested in
- *
- * If the country IE has not changed you can ignore it safely. This is
- * useful to determine if two devices are seeing two different country IEs
- * even on the same alpha2. Note that this will return false if no IE has
- * been set on the wireless core yet.
- */
-static bool country_ie_integrity_changes(u32 checksum)
-{
- /* If no IE has been set then the checksum doesn't change */
- if (unlikely(!last_request->country_ie_checksum))
- return false;
- if (unlikely(last_request->country_ie_checksum != checksum))
- return true;
- return false;
-}
-
static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
const struct ieee80211_regdomain *src_regd)
{
#undef ONE_GHZ_IN_KHZ
}
-/*
- * This is a work around for sanity checking ieee80211_channel_to_frequency()'s
- * work. ieee80211_channel_to_frequency() can for example currently provide a
- * 2 GHz channel when in fact a 5 GHz channel was desired. An example would be
- * an AP providing channel 8 on a country IE triplet when it sent this on the
- * 5 GHz band, that channel is designed to be channel 8 on 5 GHz, not a 2 GHz
- * channel.
- *
- * This can be removed once ieee80211_channel_to_frequency() takes in a band.
- */
-static bool chan_in_band(int chan, enum ieee80211_band band)
-{
- int center_freq = ieee80211_channel_to_frequency(chan);
-
- switch (band) {
- case IEEE80211_BAND_2GHZ:
- if (center_freq <= 2484)
- return true;
- return false;
- case IEEE80211_BAND_5GHZ:
- if (center_freq >= 5005)
- return true;
- return false;
- default:
- return false;
- }
-}
-
-/*
- * Some APs may send a country IE triplet for each channel they
- * support and while this is completely overkill and silly we still
- * need to support it. We avoid making a single rule for each channel
- * though and to help us with this we use this helper to find the
- * actual subband end channel. These type of country IE triplet
- * scenerios are handled then, all yielding two regulaotry rules from
- * parsing a country IE:
- *
- * [1]
- * [2]
- * [36]
- * [40]
- *
- * [1]
- * [2-4]
- * [5-12]
- * [36]
- * [40-44]
- *
- * [1-4]
- * [5-7]
- * [36-44]
- * [48-64]
- *
- * [36-36]
- * [40-40]
- * [44-44]
- * [48-48]
- * [52-52]
- * [56-56]
- * [60-60]
- * [64-64]
- * [100-100]
- * [104-104]
- * [108-108]
- * [112-112]
- * [116-116]
- * [120-120]
- * [124-124]
- * [128-128]
- * [132-132]
- * [136-136]
- * [140-140]
- *
- * Returns 0 if the IE has been found to be invalid in the middle
- * somewhere.
- */
-static int max_subband_chan(enum ieee80211_band band,
- int orig_cur_chan,
- int orig_end_channel,
- s8 orig_max_power,
- u8 **country_ie,
- u8 *country_ie_len)
-{
- u8 *triplets_start = *country_ie;
- u8 len_at_triplet = *country_ie_len;
- int end_subband_chan = orig_end_channel;
-
- /*
- * We'll deal with padding for the caller unless
- * its not immediate and we don't process any channels
- */
- if (*country_ie_len == 1) {
- *country_ie += 1;
- *country_ie_len -= 1;
- return orig_end_channel;
- }
-
- /* Move to the next triplet and then start search */
- *country_ie += 3;
- *country_ie_len -= 3;
-
- if (!chan_in_band(orig_cur_chan, band))
- return 0;
-
- while (*country_ie_len >= 3) {
- int end_channel = 0;
- struct ieee80211_country_ie_triplet *triplet =
- (struct ieee80211_country_ie_triplet *) *country_ie;
- int cur_channel = 0, next_expected_chan;
-
- /* means last triplet is completely unrelated to this one */
- if (triplet->ext.reg_extension_id >=
- IEEE80211_COUNTRY_EXTENSION_ID) {
- *country_ie -= 3;
- *country_ie_len += 3;
- break;
- }
-
- if (triplet->chans.first_channel == 0) {
- *country_ie += 1;
- *country_ie_len -= 1;
- if (*country_ie_len != 0)
- return 0;
- break;
- }
-
- if (triplet->chans.num_channels == 0)
- return 0;
-
- /* Monitonically increasing channel order */
- if (triplet->chans.first_channel <= end_subband_chan)
- return 0;
-
- if (!chan_in_band(triplet->chans.first_channel, band))
- return 0;
-
- /* 2 GHz */
- if (triplet->chans.first_channel <= 14) {
- end_channel = triplet->chans.first_channel +
- triplet->chans.num_channels - 1;
- }
- else {
- end_channel = triplet->chans.first_channel +
- (4 * (triplet->chans.num_channels - 1));
- }
-
- if (!chan_in_band(end_channel, band))
- return 0;
-
- if (orig_max_power != triplet->chans.max_power) {
- *country_ie -= 3;
- *country_ie_len += 3;
- break;
- }
-
- cur_channel = triplet->chans.first_channel;
-
- /* The key is finding the right next expected channel */
- if (band == IEEE80211_BAND_2GHZ)
- next_expected_chan = end_subband_chan + 1;
- else
- next_expected_chan = end_subband_chan + 4;
-
- if (cur_channel != next_expected_chan) {
- *country_ie -= 3;
- *country_ie_len += 3;
- break;
- }
-
- end_subband_chan = end_channel;
-
- /* Move to the next one */
- *country_ie += 3;
- *country_ie_len -= 3;
-
- /*
- * Padding needs to be dealt with if we processed
- * some channels.
- */
- if (*country_ie_len == 1) {
- *country_ie += 1;
- *country_ie_len -= 1;
- break;
- }
-
- /* If seen, the IE is invalid */
- if (*country_ie_len == 2)
- return 0;
- }
-
- if (end_subband_chan == orig_end_channel) {
- *country_ie = triplets_start;
- *country_ie_len = len_at_triplet;
- return orig_end_channel;
- }
-
- return end_subband_chan;
-}
-
-/*
- * Converts a country IE to a regulatory domain. A regulatory domain
- * structure has a lot of information which the IE doesn't yet have,
- * so for the other values we use upper max values as we will intersect
- * with our userspace regulatory agent to get lower bounds.
- */
-static struct ieee80211_regdomain *country_ie_2_rd(
- enum ieee80211_band band,
- u8 *country_ie,
- u8 country_ie_len,
- u32 *checksum)
-{
- struct ieee80211_regdomain *rd = NULL;
- unsigned int i = 0;
- char alpha2[2];
- u32 flags = 0;
- u32 num_rules = 0, size_of_regd = 0;
- u8 *triplets_start = NULL;
- u8 len_at_triplet = 0;
- /* the last channel we have registered in a subband (triplet) */
- int last_sub_max_channel = 0;
-
- *checksum = 0xDEADBEEF;
-
- /* Country IE requirements */
- BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN ||
- country_ie_len & 0x01);
-
- alpha2[0] = country_ie[0];
- alpha2[1] = country_ie[1];
-
- /*
- * Third octet can be:
- * 'I' - Indoor
- * 'O' - Outdoor
- *
- * anything else we assume is no restrictions
- */
- if (country_ie[2] == 'I')
- flags = NL80211_RRF_NO_OUTDOOR;
- else if (country_ie[2] == 'O')
- flags = NL80211_RRF_NO_INDOOR;
-
- country_ie += 3;
- country_ie_len -= 3;
-
- triplets_start = country_ie;
- len_at_triplet = country_ie_len;
-
- *checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8);
-
- /*
- * We need to build a reg rule for each triplet, but first we must
- * calculate the number of reg rules we will need. We will need one
- * for each channel subband
- */
- while (country_ie_len >= 3) {
- int end_channel = 0;
- struct ieee80211_country_ie_triplet *triplet =
- (struct ieee80211_country_ie_triplet *) country_ie;
- int cur_sub_max_channel = 0, cur_channel = 0;
-
- if (triplet->ext.reg_extension_id >=
- IEEE80211_COUNTRY_EXTENSION_ID) {
- country_ie += 3;
- country_ie_len -= 3;
- continue;
- }
-
- /*
- * APs can add padding to make length divisible
- * by two, required by the spec.
- */
- if (triplet->chans.first_channel == 0) {
- country_ie++;
- country_ie_len--;
- /* This is expected to be at the very end only */
- if (country_ie_len != 0)
- return NULL;
- break;
- }
-
- if (triplet->chans.num_channels == 0)
- return NULL;
-
- if (!chan_in_band(triplet->chans.first_channel, band))
- return NULL;
-
- /* 2 GHz */
- if (band == IEEE80211_BAND_2GHZ)
- end_channel = triplet->chans.first_channel +
- triplet->chans.num_channels - 1;
- else
- /*
- * 5 GHz -- For example in country IEs if the first
- * channel given is 36 and the number of channels is 4
- * then the individual channel numbers defined for the
- * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
- * and not 36, 37, 38, 39.
- *
- * See: http://tinyurl.com/11d-clarification
- */
- end_channel = triplet->chans.first_channel +
- (4 * (triplet->chans.num_channels - 1));
-
- cur_channel = triplet->chans.first_channel;
-
- /*
- * Enhancement for APs that send a triplet for every channel
- * or for whatever reason sends triplets with multiple channels
- * separated when in fact they should be together.
- */
- end_channel = max_subband_chan(band,
- cur_channel,
- end_channel,
- triplet->chans.max_power,
- &country_ie,
- &country_ie_len);
- if (!end_channel)
- return NULL;
-
- if (!chan_in_band(end_channel, band))
- return NULL;
-
- cur_sub_max_channel = end_channel;
-
- /* Basic sanity check */
- if (cur_sub_max_channel < cur_channel)
- return NULL;
-
- /*
- * Do not allow overlapping channels. Also channels
- * passed in each subband must be monotonically
- * increasing
- */
- if (last_sub_max_channel) {
- if (cur_channel <= last_sub_max_channel)
- return NULL;
- if (cur_sub_max_channel <= last_sub_max_channel)
- return NULL;
- }
-
- /*
- * When dot11RegulatoryClassesRequired is supported
- * we can throw ext triplets as part of this soup,
- * for now we don't care when those change as we
- * don't support them
- */
- *checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) |
- ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) |
- ((triplet->chans.max_power ^ cur_sub_max_channel) << 24);
-
- last_sub_max_channel = cur_sub_max_channel;
-
- num_rules++;
-
- if (country_ie_len >= 3) {
- country_ie += 3;
- country_ie_len -= 3;
- }
-
- /*
- * Note: this is not a IEEE requirement but
- * simply a memory requirement
- */
- if (num_rules > NL80211_MAX_SUPP_REG_RULES)
- return NULL;
- }
-
- country_ie = triplets_start;
- country_ie_len = len_at_triplet;
-
- 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;
-
- rd->n_reg_rules = num_rules;
- rd->alpha2[0] = alpha2[0];
- rd->alpha2[1] = alpha2[1];
-
- /* This time around we fill in the rd */
- while (country_ie_len >= 3) {
- int end_channel = 0;
- struct ieee80211_country_ie_triplet *triplet =
- (struct ieee80211_country_ie_triplet *) country_ie;
- struct ieee80211_reg_rule *reg_rule = NULL;
- struct ieee80211_freq_range *freq_range = NULL;
- struct ieee80211_power_rule *power_rule = NULL;
-
- /*
- * Must parse if dot11RegulatoryClassesRequired is true,
- * we don't support this yet
- */
- if (triplet->ext.reg_extension_id >=
- IEEE80211_COUNTRY_EXTENSION_ID) {
- country_ie += 3;
- country_ie_len -= 3;
- continue;
- }
-
- if (triplet->chans.first_channel == 0) {
- country_ie++;
- country_ie_len--;
- break;
- }
-
- reg_rule = &rd->reg_rules[i];
- freq_range = ®_rule->freq_range;
- power_rule = ®_rule->power_rule;
-
- reg_rule->flags = flags;
-
- /* 2 GHz */
- if (band == IEEE80211_BAND_2GHZ)
- end_channel = triplet->chans.first_channel +
- triplet->chans.num_channels -1;
- else
- end_channel = triplet->chans.first_channel +
- (4 * (triplet->chans.num_channels - 1));
-
- end_channel = max_subband_chan(band,
- triplet->chans.first_channel,
- end_channel,
- triplet->chans.max_power,
- &country_ie,
- &country_ie_len);
-
- /*
- * The +10 is since the regulatory domain expects
- * the actual band edge, not the center of freq for
- * its start and end freqs, assuming 20 MHz bandwidth on
- * the channels passed
- */
- freq_range->start_freq_khz =
- MHZ_TO_KHZ(ieee80211_channel_to_frequency(
- triplet->chans.first_channel) - 10);
- freq_range->end_freq_khz =
- MHZ_TO_KHZ(ieee80211_channel_to_frequency(
- end_channel) + 10);
-
- /*
- * These are large arbitrary values we use to intersect later.
- * Increment this if we ever support >= 40 MHz channels
- * in IEEE 802.11
- */
- freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40);
- power_rule->max_antenna_gain = DBI_TO_MBI(100);
- power_rule->max_eirp = DBM_TO_MBM(triplet->chans.max_power);
-
- i++;
-
- if (country_ie_len >= 3) {
- country_ie += 3;
- country_ie_len -= 3;
- }
-
- BUG_ON(i > NL80211_MAX_SUPP_REG_RULES);
- }
-
- return rd;
-}
-
-
/*
* Helper for regdom_intersect(), this does the real
* mathematical intersection fun
return -EINVAL;
}
-EXPORT_SYMBOL(freq_reg_info);
int freq_reg_info(struct wiphy *wiphy,
u32 center_freq,
reg_rule,
NULL);
}
+EXPORT_SYMBOL(freq_reg_info);
/*
* Note that right now we assume the desired channel bandwidth
desired_bw_khz,
®_rule);
- if (r) {
- /*
- * This means no regulatory rule was found in the country IE
- * with a frequency range on the center_freq's band, since
- * IEEE-802.11 allows for a country IE to have a subset of the
- * regulatory information provided in a country we ignore
- * disabling the channel unless at least one reg rule was
- * found on the center_freq's band. For details see this
- * clarification:
- *
- * http://tinyurl.com/11d-clarification
- */
- if (r == -ERANGE &&
- last_request->initiator ==
- NL80211_REGDOM_SET_BY_COUNTRY_IE) {
- REG_DBG_PRINT("cfg80211: Leaving channel %d MHz "
- "intact on %s - no rule found in band on "
- "Country IE\n",
- chan->center_freq, wiphy_name(wiphy));
- } else {
- /*
- * In this case we know the country IE has at least one reg rule
- * for the band so we respect its band definitions
- */
- if (last_request->initiator ==
- NL80211_REGDOM_SET_BY_COUNTRY_IE)
- REG_DBG_PRINT("cfg80211: Disabling "
- "channel %d MHz on %s due to "
- "Country IE\n",
- chan->center_freq, wiphy_name(wiphy));
- flags |= IEEE80211_CHAN_DISABLED;
- chan->flags = flags;
- }
+ if (r)
return;
- }
power_rule = ®_rule->power_rule;
freq_range = ®_rule->freq_range;
/* Caller must hold reg_mutex */
static bool reg_same_country_ie_hint(struct wiphy *wiphy,
- u32 country_ie_checksum)
+ char *alpha2, enum environment_cap env)
{
struct wiphy *request_wiphy;
return false;
if (likely(request_wiphy != wiphy))
- return !country_ie_integrity_changes(country_ie_checksum);
+ return (last_request->alpha2[0] == alpha2[0] &&
+ last_request->alpha2[1] == alpha2[1] &&
+ last_request->country_ie_env == env);
/*
* We should not have let these through at this point, they
* should have been picked up earlier by the first alpha2 check
* on the device
*/
- if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum)))
+ if (WARN_ON((last_request->alpha2[0] == alpha2[0] &&
+ last_request->alpha2[1] == alpha2[1] &&
+ last_request->country_ie_env == env )))
return true;
return false;
}
{
struct ieee80211_regdomain *rd = NULL;
char alpha2[2];
- u32 checksum = 0;
enum environment_cap env = ENVIRON_ANY;
struct regulatory_request *request;
if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
goto out;
- /*
- * Pending country IE processing, this can happen after we
- * call CRDA and wait for a response if a beacon was received before
- * we were able to process the last regulatory_hint_11d() call
- */
- if (country_ie_regdomain)
- goto out;
-
alpha2[0] = country_ie[0];
alpha2[1] = country_ie[1];
wiphy_idx_valid(last_request->wiphy_idx)))
goto out;
- rd = country_ie_2_rd(band, country_ie, country_ie_len, &checksum);
- if (!rd) {
- REG_DBG_PRINT("cfg80211: Ignoring bogus country IE\n");
- goto out;
- }
-
/*
* This will not happen right now but we leave it here for the
* the future when we want to add suspend/resume support and having
* If we hit this before we add this support we want to be informed of
* it as it would indicate a mistake in the current design
*/
- if (WARN_ON(reg_same_country_ie_hint(wiphy, checksum)))
+ if (WARN_ON(reg_same_country_ie_hint(wiphy, alpha2, env)))
goto free_rd_out;
request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
if (!request)
goto free_rd_out;
- /*
- * We keep this around for when CRDA comes back with a response so
- * we can intersect with that
- */
- country_ie_regdomain = rd;
-
request->wiphy_idx = get_wiphy_idx(wiphy);
- request->alpha2[0] = rd->alpha2[0];
- request->alpha2[1] = rd->alpha2[1];
+ request->alpha2[0] = alpha2[0];
+ request->alpha2[1] = alpha2[1];
request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
- request->country_ie_checksum = checksum;
request->country_ie_env = env;
mutex_unlock(®_mutex);
print_rd_rules(rd);
}
-#ifdef CONFIG_CFG80211_REG_DEBUG
-static void reg_country_ie_process_debug(
- const struct ieee80211_regdomain *rd,
- const struct ieee80211_regdomain *country_ie_regdomain,
- const struct ieee80211_regdomain *intersected_rd)
-{
- printk(KERN_DEBUG "cfg80211: Received country IE:\n");
- print_regdomain_info(country_ie_regdomain);
- printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n");
- print_regdomain_info(rd);
- if (intersected_rd) {
- printk(KERN_DEBUG "cfg80211: We intersect both of these "
- "and get:\n");
- print_regdomain_info(intersected_rd);
- return;
- }
- printk(KERN_DEBUG "cfg80211: Intersection between both failed\n");
-}
-#else
-static inline void reg_country_ie_process_debug(
- const struct ieee80211_regdomain *rd,
- const struct ieee80211_regdomain *country_ie_regdomain,
- const struct ieee80211_regdomain *intersected_rd)
-{
-}
-#endif
-
/* Takes ownership of rd only if it doesn't fail */
static int __set_regdom(const struct ieee80211_regdomain *rd)
{
return 0;
}
- /*
- * Country IE requests are handled a bit differently, we intersect
- * the country IE rd with what CRDA believes that country should have
- */
-
- /*
- * Userspace could have sent two replies with only
- * one kernel request. By the second reply we would have
- * already processed and consumed the country_ie_regdomain.
- */
- if (!country_ie_regdomain)
- return -EALREADY;
- BUG_ON(rd == country_ie_regdomain);
-
- /*
- * Intersect what CRDA returned and our what we
- * had built from the Country IE received
- */
-
- intersected_rd = regdom_intersect(rd, country_ie_regdomain);
-
- reg_country_ie_process_debug(rd,
- country_ie_regdomain,
- intersected_rd);
-
- kfree(country_ie_regdomain);
- country_ie_regdomain = NULL;
-
if (!intersected_rd)
return -EINVAL;
reset_regdomains();
- kfree(country_ie_regdomain);
- country_ie_regdomain = NULL;
-
kfree(last_request);
platform_device_unregister(reg_pdev);
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff