include/net/regulatory.h

   1 #ifndef __NET_REGULATORY_H
   2 #define __NET_REGULATORY_H
   3 /*
   4  * regulatory support structures
   5  *
   6  * Copyright 2008-2009  Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
   7  *
   8  * Permission to use, copy, modify, and/or distribute this software for any
   9  * purpose with or without fee is hereby granted, provided that the above
  10  * copyright notice and this permission notice appear in all copies.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  13  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  14  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  15  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  16  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  17  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  18  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  19  */
  20
  21 #include <linux/rcupdate.h>
  22
  23 /**
  24  * enum environment_cap - Environment parsed from country IE
  25  * @ENVIRON_ANY: indicates country IE applies to both indoor and
  26  *      outdoor operation.
  27  * @ENVIRON_INDOOR: indicates country IE applies only to indoor operation
  28  * @ENVIRON_OUTDOOR: indicates country IE applies only to outdoor operation
  29  */
  30 enum environment_cap {
  31         ENVIRON_ANY,
  32         ENVIRON_INDOOR,
  33         ENVIRON_OUTDOOR,
  34 };
  35
  36 /**
  37  * struct regulatory_request - used to keep track of regulatory requests
  38  *
  39  * @rcu_head: RCU head struct used to free the request
  40  * @wiphy_idx: this is set if this request's initiator is
  41  *      %REGDOM_SET_BY_COUNTRY_IE or %REGDOM_SET_BY_DRIVER. This
  42  *      can be used by the wireless core to deal with conflicts
  43  *      and potentially inform users of which devices specifically
  44  *      cased the conflicts.
  45  * @initiator: indicates who sent this request, could be any of
  46  *      of those set in nl80211_reg_initiator (%NL80211_REGDOM_SET_BY_*)
  47  * @alpha2: the ISO / IEC 3166 alpha2 country code of the requested
  48  *      regulatory domain. We have a few special codes:
  49  *      00 - World regulatory domain
  50  *      99 - built by driver but a specific alpha2 cannot be determined
  51  *      98 - result of an intersection between two regulatory domains
  52  *      97 - regulatory domain has not yet been configured
  53  * @dfs_region: If CRDA responded with a regulatory domain that requires
  54  *      DFS master operation on a known DFS region (NL80211_DFS_*),
  55  *      dfs_region represents that region. Drivers can use this and the
  56  *      @alpha2 to adjust their device's DFS parameters as required.
  57  * @user_reg_hint_type: if the @initiator was of type
  58  *      %NL80211_REGDOM_SET_BY_USER, this classifies the type
  59  *      of hint passed. This could be any of the %NL80211_USER_REG_HINT_*
  60  *      types.
  61  * @intersect: indicates whether the wireless core should intersect
  62  *      the requested regulatory domain with the presently set regulatory
  63  *      domain.
  64  * @processed: indicates whether or not this requests has already been
  65  *      processed. When the last request is processed it means that the
  66  *      currently regulatory domain set on cfg80211 is updated from
  67  *      CRDA and can be used by other regulatory requests. When a
  68  *      the last request is not yet processed we must yield until it
  69  *      is processed before processing any new requests.
  70  * @country_ie_checksum: checksum of the last processed and accepted
  71  *      country IE
  72  * @country_ie_env: lets us know if the AP is telling us we are outdoor,
  73  *      indoor, or if it doesn't matter
  74  * @list: used to insert into the reg_requests_list linked list
  75  */
  76 struct regulatory_request {
  77         struct rcu_head rcu_head;
  78         int wiphy_idx;
  79         enum nl80211_reg_initiator initiator;
  80         enum nl80211_user_reg_hint_type user_reg_hint_type;
  81         char alpha2[3];
  82         enum nl80211_dfs_regions dfs_region;
  83         bool intersect;
  84         bool processed;
  85         enum environment_cap country_ie_env;
  86         struct list_head list;
  87 };
  88
  89 /**
  90  * enum ieee80211_regulatory_flags - device regulatory flags
  91  *
  92  * @REGULATORY_CUSTOM_REG: tells us the driver for this device
  93  *      has its own custom regulatory domain and cannot identify the
  94  *      ISO / IEC 3166 alpha2 it belongs to. When this is enabled
  95  *      we will disregard the first regulatory hint (when the
  96  *      initiator is %REGDOM_SET_BY_CORE). Drivers that use
  97  *      wiphy_apply_custom_regulatory() should have this flag set
  98  *      or the regulatory core will set it for the wiphy.
  99  *      If you use regulatory_hint() *after* using
 100  *      wiphy_apply_custom_regulatory() the wireless core will
 101  *      clear the REGULATORY_CUSTOM_REG for your wiphy as it would be
 102  *      implied that the device somehow gained knowledge of its region.
 103  * @REGULATORY_STRICT_REG: tells us that the wiphy for this device
 104  *      has regulatory domain that it wishes to be considered as the
 105  *      superset for regulatory rules. After this device gets its regulatory
 106  *      domain programmed further regulatory hints shall only be considered
 107  *      for this device to enhance regulatory compliance, forcing the
 108  *      device to only possibly use subsets of the original regulatory
 109  *      rules. For example if channel 13 and 14 are disabled by this
 110  *      device's regulatory domain no user specified regulatory hint which
 111  *      has these channels enabled would enable them for this wiphy,
 112  *      the device's original regulatory domain will be trusted as the
 113  *      base. You can program the superset of regulatory rules for this
 114  *      wiphy with regulatory_hint() for cards programmed with an
 115  *      ISO3166-alpha2 country code. wiphys that use regulatory_hint()
 116  *      will have their wiphy->regd programmed once the regulatory
 117  *      domain is set, and all other regulatory hints will be ignored
 118  *      until their own regulatory domain gets programmed.
 119  * @REGULATORY_DISABLE_BEACON_HINTS: enable this if your driver needs to
 120  *      ensure that passive scan flags and beaconing flags may not be lifted by
 121  *      cfg80211 due to regulatory beacon hints. For more information on beacon
 122  *      hints read the documenation for regulatory_hint_found_beacon()
 123  * @REGULATORY_COUNTRY_IE_FOLLOW_POWER:  for devices that have a preference
 124  *      that even though they may have programmed their own custom power
 125  *      setting prior to wiphy registration, they want to ensure their channel
 126  *      power settings are updated for this connection with the power settings
 127  *      derived from the regulatory domain. The regulatory domain used will be
 128  *      based on the ISO3166-alpha2 from country IE provided through
 129  *      regulatory_hint_country_ie()
 130  * @REGULATORY_COUNTRY_IE_IGNORE: for devices that have a preference to ignore
 131  *      all country IE information processed by the regulatory core. This will
 132  *      override %REGULATORY_COUNTRY_IE_FOLLOW_POWER as all country IEs will
 133  *      be ignored.
 134  * @REGULATORY_ENABLE_RELAX_NO_IR: for devices that wish to allow the
 135  *      NO_IR relaxation, which enables transmissions on channels on which
 136  *      otherwise initiating radiation is not allowed. This will enable the
 137  *      relaxations enabled under the CFG80211_REG_RELAX_NO_IR configuration
 138  *      option
 139  * @REGULATORY_IGNORE_STALE_KICKOFF: the regulatory core will _not_ make sure
 140  *      all interfaces on this wiphy reside on allowed channels. If this flag
 141  *      is not set, upon a regdomain change, the interfaces are given a grace
 142  *      period (currently 60 seconds) to disconnect or move to an allowed
 143  *      channel. Interfaces on forbidden channels are forcibly disconnected.
 144  *      Currently these types of interfaces are supported for enforcement:
 145  *      NL80211_IFTYPE_ADHOC, NL80211_IFTYPE_STATION, NL80211_IFTYPE_AP,
 146  *      NL80211_IFTYPE_AP_VLAN, NL80211_IFTYPE_MONITOR,
 147  *      NL80211_IFTYPE_P2P_CLIENT, NL80211_IFTYPE_P2P_GO,
 148  *      NL80211_IFTYPE_P2P_DEVICE. The flag will be set by default if a device
 149  *      includes any modes unsupported for enforcement checking.
 150  * @REGULATORY_WIPHY_SELF_MANAGED: for devices that employ wiphy-specific
 151  *      regdom management. These devices will ignore all regdom changes not
 152  *      originating from their own wiphy.
 153  *      A self-managed wiphys only employs regulatory information obtained from
 154  *      the FW and driver and does not use other cfg80211 sources like
 155  *      beacon-hints, country-code IEs and hints from other devices on the same
 156  *      system. Conversely, a self-managed wiphy does not share its regulatory
 157  *      hints with other devices in the system. If a system contains several
 158  *      devices, one or more of which are self-managed, there might be
 159  *      contradictory regulatory settings between them. Usage of flag is
 160  *      generally discouraged. Only use it if the FW/driver is incompatible
 161  *      with non-locally originated hints.
 162  *      This flag is incompatible with the flags: %REGULATORY_CUSTOM_REG,
 163  *      %REGULATORY_STRICT_REG, %REGULATORY_COUNTRY_IE_FOLLOW_POWER,
 164  *      %REGULATORY_COUNTRY_IE_IGNORE and %REGULATORY_DISABLE_BEACON_HINTS.
 165  *      Mixing any of the above flags with this flag will result in a failure
 166  *      to register the wiphy. This flag implies
 167  *      %REGULATORY_DISABLE_BEACON_HINTS and %REGULATORY_COUNTRY_IE_IGNORE.
 168  */
 169 enum ieee80211_regulatory_flags {
 170         REGULATORY_CUSTOM_REG                   = BIT(0),
 171         REGULATORY_STRICT_REG                   = BIT(1),
 172         REGULATORY_DISABLE_BEACON_HINTS         = BIT(2),
 173         REGULATORY_COUNTRY_IE_FOLLOW_POWER      = BIT(3),
 174         REGULATORY_COUNTRY_IE_IGNORE            = BIT(4),
 175         REGULATORY_ENABLE_RELAX_NO_IR           = BIT(5),
 176         REGULATORY_IGNORE_STALE_KICKOFF         = BIT(6),
 177         REGULATORY_WIPHY_SELF_MANAGED           = BIT(7),
 178 };
 179
 180 struct ieee80211_freq_range {
 181         u32 start_freq_khz;
 182         u32 end_freq_khz;
 183         u32 max_bandwidth_khz;
 184 };
 185
 186 struct ieee80211_power_rule {
 187         u32 max_antenna_gain;
 188         u32 max_eirp;
 189 };
 190
 191 struct ieee80211_reg_rule {
 192         struct ieee80211_freq_range freq_range;
 193         struct ieee80211_power_rule power_rule;
 194         u32 flags;
 195         u32 dfs_cac_ms;
 196 };
 197
 198 struct ieee80211_regdomain {
 199         struct rcu_head rcu_head;
 200         u32 n_reg_rules;
 201         char alpha2[3];
 202         enum nl80211_dfs_regions dfs_region;
 203         struct ieee80211_reg_rule reg_rules[];
 204 };
 205
 206 #define MHZ_TO_KHZ(freq) ((freq) * 1000)
 207 #define KHZ_TO_MHZ(freq) ((freq) / 1000)
 208 #define DBI_TO_MBI(gain) ((gain) * 100)
 209 #define MBI_TO_DBI(gain) ((gain) / 100)
 210 #define DBM_TO_MBM(gain) ((gain) * 100)
 211 #define MBM_TO_DBM(gain) ((gain) / 100)
 212
 213 #define REG_RULE_EXT(start, end, bw, gain, eirp, dfs_cac, reg_flags)    \
 214 {                                                                       \
 215         .freq_range.start_freq_khz = MHZ_TO_KHZ(start),                 \
 216         .freq_range.end_freq_khz = MHZ_TO_KHZ(end),                     \
 217         .freq_range.max_bandwidth_khz = MHZ_TO_KHZ(bw),                 \
 218         .power_rule.max_antenna_gain = DBI_TO_MBI(gain),                \
 219         .power_rule.max_eirp = DBM_TO_MBM(eirp),                        \
 220         .flags = reg_flags,                                             \
 221         .dfs_cac_ms = dfs_cac,                                          \
 222 }
 223
 224 #define REG_RULE(start, end, bw, gain, eirp, reg_flags) \
 225         REG_RULE_EXT(start, end, bw, gain, eirp, 0, reg_flags)
 226
 227 #endif