Return-path: Received: from mga11.intel.com ([192.55.52.93]:17932 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753678AbaA0KUZ (ORCPT ); Mon, 27 Jan 2014 05:20:25 -0500 From: Ilan Peer To: linux-wireless@vger.kernel.org Cc: wireless-regdb@lists.infradead.org, Ilan Peer Subject: [PATCH v3 3/6] cfg80211: Enable GO operation on additional channels Date: Mon, 27 Jan 2014 12:21:55 +0200 Message-Id: <1390818118-27261-4-git-send-email-ilan.peer@intel.com> (sfid-20140127_112147_514798_01405A03) In-Reply-To: <1390818118-27261-1-git-send-email-ilan.peer@intel.com> References: <1390818118-27261-1-git-send-email-ilan.peer@intel.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: Allow GO operation on a channel marked with IEEE80211_CHAN_GO_CONCURRENT iff there is an active station interface that is associated to an AP operating on the same channel in 2.4 or the same UNII band in 5.2 (assuming that the AP is an authorized master) Note that this is a permissive approach to the FCC definitions, that require a clear assessment that the device operating the AP is an authorized master, i.e., with radar detection and DFS capabilities. It is assumed that such restrictions are enforced by user space. Furthermore, it is assumed, that if the conditions that allowed for the operation of the GO on such a channel change, i.e., the station interface disconnected from the AP, it is the responsibility of user space to evacuate the GO from the channel. Signed-off-by: Ilan Peer --- include/net/cfg80211.h | 4 ++- include/net/regulatory.h | 4 +++ net/mac80211/ibss.c | 9 ++++-- net/wireless/Kconfig | 14 ++++++++++ net/wireless/chan.c | 68 ++++++++++++++++++++++++++++++++++++++++++++-- net/wireless/mesh.c | 3 +- net/wireless/nl80211.c | 11 +++++--- net/wireless/reg.c | 26 ++++++++++++++++++ net/wireless/reg.h | 12 ++++++++ net/wireless/trace.h | 11 +++++--- 10 files changed, 146 insertions(+), 16 deletions(-) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index dbc5490..317bd06 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -4520,12 +4520,14 @@ void cfg80211_report_obss_beacon(struct wiphy *wiphy, * cfg80211_reg_can_beacon - check if beaconing is allowed * @wiphy: the wiphy * @chandef: the channel definition + * @iftype: interface type * * Return: %true if there is no secondary channel or the secondary channel(s) * can be used for beaconing (i.e. is not a radar channel etc.) */ bool cfg80211_reg_can_beacon(struct wiphy *wiphy, - struct cfg80211_chan_def *chandef); + struct cfg80211_chan_def *chandef, + enum nl80211_iftype iftype); /* * cfg80211_ch_switch_notify - update wdev channel and notify userspace diff --git a/include/net/regulatory.h b/include/net/regulatory.h index b07cdc9..fab0c37 100644 --- a/include/net/regulatory.h +++ b/include/net/regulatory.h @@ -131,6 +131,9 @@ struct regulatory_request { * all country IE information processed by the regulatory core. This will * override %REGULATORY_COUNTRY_IE_FOLLOW_POWER as all country IEs will * be ignored. + * @REGULATORY_DISABLE_RELAX_NO_IR: for devices that do not wish to allow the + * NO_IR relaxation, which enables transmissions on channels on which + * otherwise initiating radiation is not allowed. */ enum ieee80211_regulatory_flags { REGULATORY_CUSTOM_REG = BIT(0), @@ -138,6 +141,7 @@ enum ieee80211_regulatory_flags { REGULATORY_DISABLE_BEACON_HINTS = BIT(2), REGULATORY_COUNTRY_IE_FOLLOW_POWER = BIT(3), REGULATORY_COUNTRY_IE_IGNORE = BIT(4), + REGULATORY_DISABLE_RELAX_NO_IR = BIT(5), }; struct ieee80211_freq_range { diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c index 771080e..3503ddb 100644 --- a/net/mac80211/ibss.c +++ b/net/mac80211/ibss.c @@ -263,7 +263,8 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, /* make a copy of the chandef, it could be modified below. */ chandef = *req_chandef; chan = chandef.chan; - if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) { + if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, + NL80211_IFTYPE_ADHOC)) { if (chandef.width == NL80211_CHAN_WIDTH_5 || chandef.width == NL80211_CHAN_WIDTH_10 || chandef.width == NL80211_CHAN_WIDTH_20_NOHT || @@ -275,7 +276,8 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, chandef.width = NL80211_CHAN_WIDTH_20; chandef.center_freq1 = chan->center_freq; /* check again for downgraded chandef */ - if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) { + if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, + NL80211_IFTYPE_ADHOC)) { sdata_info(sdata, "Failed to join IBSS, beacons forbidden\n"); return; @@ -868,7 +870,8 @@ ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, goto disconnect; } - if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef)) { + if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, + NL80211_IFTYPE_ADHOC)) { sdata_info(sdata, "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", ifibss->bssid, diff --git a/net/wireless/Kconfig b/net/wireless/Kconfig index 81c05e4..6335590 100644 --- a/net/wireless/Kconfig +++ b/net/wireless/Kconfig @@ -102,6 +102,20 @@ config CFG80211_REG_CELLULAR_HINTS This option adds support for drivers that can receive regulatory hints from cellular base stations +config CFG80211_REG_RELAX_NO_IR + bool "cfg80211 support for NO_IR relaxation" + depends on CFG80211_CERTIFICATION_ONUS + ---help--- + This option enables relaxation of the NO_IR flag. The relaxation + allows initiating radiation on channels that are marked with the + NO_IR flag which forbids transmissions on the channel. + + For example, enabling this option allows the operation of a P2P + group owner on channels marked with NO_IR if there is an additional + BSS interface which is connected to an AP which is assumed to be + an authorized master, i.e., with radar detection support and DFS + capabilities + config CFG80211_DEFAULT_PS bool "enable powersave by default" depends on CFG80211 diff --git a/net/wireless/chan.c b/net/wireless/chan.c index 78559b5..87a9d0e 100644 --- a/net/wireless/chan.c +++ b/net/wireless/chan.c @@ -605,15 +605,77 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy, } EXPORT_SYMBOL(cfg80211_chandef_usable); +/* + * For GO only, check if the channel can be used under permissive conditions + * mandated by the some regulatory bodies, i.e., the channel is marked with + * IEEE80211_CHAN_GO_CONCURRENT and there is an additional station interface + * associated to an AP on the same channel or on the same UNII band + * (assuming that the AP is an authorized master). + */ +static bool cfg80211_go_permissive_chan(struct cfg80211_registered_device *rdev, + struct ieee80211_channel *chan) +{ + struct wireless_dev *wdev_iter; + + ASSERT_RTNL(); + + if (!(chan->flags & IEEE80211_CHAN_GO_CONCURRENT)) + return false; + + list_for_each_entry(wdev_iter, &rdev->wdev_list, list) { + struct ieee80211_channel *other_chan = NULL; + int r1, r2; + + if (wdev_iter->iftype != NL80211_IFTYPE_STATION || + !netif_running(wdev_iter->netdev)) + continue; + + wdev_lock(wdev_iter); + if (wdev_iter->current_bss) + other_chan = wdev_iter->current_bss->pub.channel; + wdev_unlock(wdev_iter); + + if (!other_chan) + continue; + + if (chan == other_chan) + return true; + + if (chan->band != IEEE80211_BAND_5GHZ) + continue; + + r1 = cfg80211_get_unii(chan->center_freq); + r2 = cfg80211_get_unii(other_chan->center_freq); + + if (r1 != -EINVAL && r1 == r2) + return true; + } + + return false; +} + bool cfg80211_reg_can_beacon(struct wiphy *wiphy, - struct cfg80211_chan_def *chandef) + struct cfg80211_chan_def *chandef, + enum nl80211_iftype iftype) { + struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); bool res; u32 prohibited_flags = IEEE80211_CHAN_DISABLED | - IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR; - trace_cfg80211_reg_can_beacon(wiphy, chandef); + trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype); + + /* + * Under certain conditions suggested by the some regulatory bodies + * a GO can operate on channels marked with IEEE80211_NO_IR + * so set this flag only if such relaxations are not enabled and + * the conditions are not met. + */ + if (iftype != NL80211_IFTYPE_P2P_GO || + !config_enabled(CONFIG_CFG80211_REG_RELAX_NO_IR) || + (wiphy->regulatory_flags & REGULATORY_DISABLE_RELAX_NO_IR) || + !cfg80211_go_permissive_chan(rdev, chandef->chan)) + prohibited_flags |= IEEE80211_CHAN_NO_IR; if (cfg80211_chandef_dfs_required(wiphy, chandef) > 0 && cfg80211_chandef_dfs_available(wiphy, chandef)) { diff --git a/net/wireless/mesh.c b/net/wireless/mesh.c index 8858624..93c4d42 100644 --- a/net/wireless/mesh.c +++ b/net/wireless/mesh.c @@ -175,7 +175,8 @@ int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev, scan_width); } - if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef)) + if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef, + NL80211_IFTYPE_MESH_POINT)) return -EINVAL; err = cfg80211_chandef_dfs_required(wdev->wiphy, &setup->chandef); diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 3c1587f..b37b36e 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -1914,7 +1914,7 @@ static int __nl80211_set_channel(struct cfg80211_registered_device *rdev, result = -EBUSY; break; } - if (!cfg80211_reg_can_beacon(&rdev->wiphy, &chandef)) { + if (!cfg80211_reg_can_beacon(&rdev->wiphy, &chandef, iftype)) { result = -EINVAL; break; } @@ -3263,7 +3263,8 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info) } else if (!nl80211_get_ap_channel(rdev, ¶ms)) return -EINVAL; - if (!cfg80211_reg_can_beacon(&rdev->wiphy, ¶ms.chandef)) + if (!cfg80211_reg_can_beacon(&rdev->wiphy, ¶ms.chandef, + wdev->iftype)) return -EINVAL; err = cfg80211_chandef_dfs_required(wdev->wiphy, ¶ms.chandef); @@ -5852,7 +5853,8 @@ skip_beacons: if (err) return err; - if (!cfg80211_reg_can_beacon(&rdev->wiphy, ¶ms.chandef)) + if (!cfg80211_reg_can_beacon(&rdev->wiphy, ¶ms.chandef, + wdev->iftype)) return -EINVAL; if (dev->ieee80211_ptr->iftype == NL80211_IFTYPE_AP || @@ -6623,7 +6625,8 @@ static int nl80211_join_ibss(struct sk_buff *skb, struct genl_info *info) if (err) return err; - if (!cfg80211_reg_can_beacon(&rdev->wiphy, &ibss.chandef)) + if (!cfg80211_reg_can_beacon(&rdev->wiphy, &ibss.chandef, + NL80211_IFTYPE_ADHOC)) return -EINVAL; switch (ibss.chandef.width) { diff --git a/net/wireless/reg.c b/net/wireless/reg.c index 8a81913..ec38f5d 100644 --- a/net/wireless/reg.c +++ b/net/wireless/reg.c @@ -2489,6 +2489,32 @@ static void reg_timeout_work(struct work_struct *work) rtnl_unlock(); } +int cfg80211_get_unii(int freq) +{ + /* UNII-1 */ + if (freq >= 5150 && freq <= 5250) + return 0; + + /* UNII-2A */ + if (freq > 5250 && freq <= 5350) + return 1; + + /* UNII-2B */ + if (freq > 5350 && freq <= 5470) + return 2; + + /* UNII-2C */ + if (freq > 5470 && freq <= 5725) + return 3; + + /* UNII-3 */ + if (freq > 5725 && freq <= 5825) + return 4; + + WARN_ON(1); + return -EINVAL; +} + int __init regulatory_init(void) { int err = 0; diff --git a/net/wireless/reg.h b/net/wireless/reg.h index 02bd8f4..4d44cd4 100644 --- a/net/wireless/reg.h +++ b/net/wireless/reg.h @@ -103,4 +103,16 @@ void regulatory_hint_country_ie(struct wiphy *wiphy, */ void regulatory_hint_disconnect(void); +/** + * cfg80211_get_unii - get the U-NII band for the frequency + * @freq: the frequency for which we want to get the UNII band. + + * Get a value specifying the U-NII band frequency belongs to. + * U-NII bands are defined by the FCC in C.F.R 47 part 15. + * + * Returns -EINVAL if freq is invalid, 0 for UNII-1, 1 for UNII-2A, + * 2 for UNII-2B, 3 for UNII-2C and 4 for UNII-3. + */ +int cfg80211_get_unii(int freq); + #endif /* __NET_WIRELESS_REG_H */ diff --git a/net/wireless/trace.h b/net/wireless/trace.h index fbcc23e..3ba80c1 100644 --- a/net/wireless/trace.h +++ b/net/wireless/trace.h @@ -2189,18 +2189,21 @@ TRACE_EVENT(cfg80211_cqm_rssi_notify, ); TRACE_EVENT(cfg80211_reg_can_beacon, - TP_PROTO(struct wiphy *wiphy, struct cfg80211_chan_def *chandef), - TP_ARGS(wiphy, chandef), + TP_PROTO(struct wiphy *wiphy, struct cfg80211_chan_def *chandef, + enum nl80211_iftype iftype), + TP_ARGS(wiphy, chandef, iftype), TP_STRUCT__entry( WIPHY_ENTRY CHAN_DEF_ENTRY + __field(enum nl80211_iftype, iftype) ), TP_fast_assign( WIPHY_ASSIGN; CHAN_DEF_ASSIGN(chandef); + __entry->iftype = iftype; ), - TP_printk(WIPHY_PR_FMT ", " CHAN_DEF_PR_FMT, - WIPHY_PR_ARG, CHAN_DEF_PR_ARG) + TP_printk(WIPHY_PR_FMT ", " CHAN_DEF_PR_FMT ", iftype=%d", + WIPHY_PR_ARG, CHAN_DEF_PR_ARG, __entry->iftype) ); TRACE_EVENT(cfg80211_chandef_dfs_required, -- 1.7.10.4