diff options
Diffstat (limited to 'net/wireless/reg.c')
| -rw-r--r-- | net/wireless/reg.c | 625 |
1 files changed, 12 insertions, 613 deletions
diff --git a/net/wireless/reg.c b/net/wireless/reg.c index 1ac2bdd46ecf..678d0bd433f0 100644 --- a/net/wireless/reg.c +++ b/net/wireless/reg.c @@ -67,17 +67,9 @@ static struct platform_device *reg_pdev; 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); @@ -275,25 +267,6 @@ static bool is_user_regdom_saved(void) 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) { @@ -506,471 +479,6 @@ static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, } /* - * 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 */ @@ -1191,7 +699,6 @@ static int freq_reg_info_regd(struct wiphy *wiphy, return -EINVAL; } -EXPORT_SYMBOL(freq_reg_info); int freq_reg_info(struct wiphy *wiphy, u32 center_freq, @@ -1205,6 +712,7 @@ int freq_reg_info(struct wiphy *wiphy, reg_rule, NULL); } +EXPORT_SYMBOL(freq_reg_info); /* * Note that right now we assume the desired channel bandwidth @@ -1243,41 +751,8 @@ static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band, 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; @@ -2010,7 +1485,7 @@ EXPORT_SYMBOL(regulatory_hint); /* 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; @@ -2026,13 +1501,17 @@ static bool reg_same_country_ie_hint(struct wiphy *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; } @@ -2048,7 +1527,6 @@ void regulatory_hint_11d(struct wiphy *wiphy, { struct ieee80211_regdomain *rd = NULL; char alpha2[2]; - u32 checksum = 0; enum environment_cap env = ENVIRON_ANY; struct regulatory_request *request; @@ -2064,14 +1542,6 @@ void regulatory_hint_11d(struct wiphy *wiphy, 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]; @@ -2090,12 +1560,6 @@ void regulatory_hint_11d(struct wiphy *wiphy, 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 @@ -2105,24 +1569,17 @@ void regulatory_hint_11d(struct wiphy *wiphy, * 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); @@ -2383,33 +1840,6 @@ static void print_regdomain_info(const struct ieee80211_regdomain *rd) 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) { @@ -2521,34 +1951,6 @@ 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; @@ -2688,9 +2090,6 @@ void /* __init_or_exit */ regulatory_exit(void) reset_regdomains(); - kfree(country_ie_regdomain); - country_ie_regdomain = NULL; - kfree(last_request); platform_device_unregister(reg_pdev); |