From 0ad8acaf434d360ad99813d981a68e605d6c8179 Mon Sep 17 00:00:00 2001 From: "Luis R. Rodriguez" Date: Tue, 24 Mar 2009 21:21:08 -0400 Subject: cfg80211: fix NULL pointer deference in reg_device_remove() We won't ever get here as regulatory_hint_core() can only fail on -ENOMEM and in that case we don't initialize cfg80211 but this is technically correct code. This is actually good for stable, where we don't check for -ENOMEM failure on __regulatory_hint()'s failure. Cc: stable@kernel.org Reported-by: Quentin Armitage Signed-off-by: Luis R. Rodriguez Signed-off-by: John W. Linville --- net/wireless/reg.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'net') diff --git a/net/wireless/reg.c b/net/wireless/reg.c index 6327e1617ac..6c1993d9990 100644 --- a/net/wireless/reg.c +++ b/net/wireless/reg.c @@ -2095,11 +2095,12 @@ int set_regdom(const struct ieee80211_regdomain *rd) /* Caller must hold cfg80211_mutex */ void reg_device_remove(struct wiphy *wiphy) { - struct wiphy *request_wiphy; + struct wiphy *request_wiphy = NULL; assert_cfg80211_lock(); - request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); + if (last_request) + request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx); kfree(wiphy->regd); if (!last_request || !request_wiphy) -- cgit v1.2.3-18-g5258 From b3631286aca3f54427ca0eb950981e9753866f6c Mon Sep 17 00:00:00 2001 From: Vasanthakumar Thiagarajan Date: Wed, 25 Mar 2009 18:10:18 +0530 Subject: mac80211: Fix bug in getting rx status for frames pending in reorder buffer Currently rx status for frames which are completed from reorder buffer is taken from it's cb area which is not always right, cb is not holding the rx status when driver uses mac80211's non-irq rx handler to pass it's received frames. This results in dropping almost all frames from reorder buffer when security is enabled by doing double decryption (first in hw, second in sw because of wrong rx status). This patch copies rx status into cb area before the frame is put into reorder buffer. After this patch, there is a significant improvement in throughput with ath9k + WPA2(AES). Signed-off-by: Vasanthakumar Thiagarajan Acked-by: Johannes Berg Cc: stable@kernel.org Signed-off-by: John W. Linville --- net/mac80211/rx.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) (limited to 'net') diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 64ebe664eff..5fa7aedd90e 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -29,6 +29,7 @@ static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, struct tid_ampdu_rx *tid_agg_rx, struct sk_buff *skb, + struct ieee80211_rx_status *status, u16 mpdu_seq_num, int bar_req); /* @@ -1688,7 +1689,7 @@ ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) /* manage reordering buffer according to requested */ /* sequence number */ rcu_read_lock(); - ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, + ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, NULL, start_seq_num, 1); rcu_read_unlock(); return RX_DROP_UNUSABLE; @@ -2293,6 +2294,7 @@ static inline u16 seq_sub(u16 sq1, u16 sq2) static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, struct tid_ampdu_rx *tid_agg_rx, struct sk_buff *skb, + struct ieee80211_rx_status *rxstatus, u16 mpdu_seq_num, int bar_req) { @@ -2374,6 +2376,8 @@ static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, /* put the frame in the reordering buffer */ tid_agg_rx->reorder_buf[index] = skb; + memcpy(tid_agg_rx->reorder_buf[index]->cb, rxstatus, + sizeof(*rxstatus)); tid_agg_rx->stored_mpdu_num++; /* release the buffer until next missing frame */ index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) @@ -2399,7 +2403,8 @@ static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, } static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, - struct sk_buff *skb) + struct sk_buff *skb, + struct ieee80211_rx_status *status) { struct ieee80211_hw *hw = &local->hw; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; @@ -2448,7 +2453,7 @@ static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, /* according to mpdu sequence number deal with reordering buffer */ mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; - ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, + ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, status, mpdu_seq_num, 0); end_reorder: return ret; @@ -2512,7 +2517,7 @@ void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, return; } - if (!ieee80211_rx_reorder_ampdu(local, skb)) + if (!ieee80211_rx_reorder_ampdu(local, skb, status)) __ieee80211_rx_handle_packet(hw, skb, status, rate); rcu_read_unlock(); -- cgit v1.2.3-18-g5258 From 47afbaf5af9454a7a1a64591e20cbfcc27ca67a8 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Tue, 7 Apr 2009 15:22:28 +0200 Subject: mac80211: correct wext transmit power handler Wext makes no assumptions about the contents of data->txpower.fixed and data->txpower.value when data->txpower.disabled is set, so do not update the user-requested power level while disabling. Also, when wext configures a really _fixed_ power output [1], we should reject it instead of limiting it to the regulatory constraint. If the user wants to set a _limit_ [2] then we should honour that. [1] iwconfig wlan0 txpower 20dBm fixed [2] iwconfig wlan0 txpower 10dBm This fixes http://www.intellinuxwireless.org/bugzilla/show_bug.cgi?id=1942 Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- net/mac80211/main.c | 2 +- net/mac80211/wext.c | 41 +++++++++++++++++++++++++++++++++-------- 2 files changed, 34 insertions(+), 9 deletions(-) (limited to 'net') diff --git a/net/mac80211/main.c b/net/mac80211/main.c index a6f1d8a869b..fbcbed6cad0 100644 --- a/net/mac80211/main.c +++ b/net/mac80211/main.c @@ -258,7 +258,7 @@ int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) (chan->max_power - local->power_constr_level) : chan->max_power; - if (local->user_power_level) + if (local->user_power_level >= 0) power = min(power, local->user_power_level); if (local->hw.conf.power_level != power) { diff --git a/net/mac80211/wext.c b/net/mac80211/wext.c index deb4ecec122..ce9115c1815 100644 --- a/net/mac80211/wext.c +++ b/net/mac80211/wext.c @@ -417,6 +417,7 @@ static int ieee80211_ioctl_siwtxpower(struct net_device *dev, { struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); struct ieee80211_channel* chan = local->hw.conf.channel; + bool reconf = false; u32 reconf_flags = 0; int new_power_level; @@ -427,14 +428,38 @@ static int ieee80211_ioctl_siwtxpower(struct net_device *dev, if (!chan) return -EINVAL; - if (data->txpower.fixed) - new_power_level = min(data->txpower.value, chan->max_power); - else /* Automatic power level setting */ - new_power_level = chan->max_power; + /* only change when not disabling */ + if (!data->txpower.disabled) { + if (data->txpower.fixed) { + if (data->txpower.value < 0) + return -EINVAL; + new_power_level = data->txpower.value; + /* + * Debatable, but we cannot do a fixed power + * level above the regulatory constraint. + * Use "iwconfig wlan0 txpower 15dBm" instead. + */ + if (new_power_level > chan->max_power) + return -EINVAL; + } else { + /* + * Automatic power level setting, max being the value + * passed in from userland. + */ + if (data->txpower.value < 0) + new_power_level = -1; + else + new_power_level = data->txpower.value; + } + + reconf = true; - local->user_power_level = new_power_level; - if (local->hw.conf.power_level != new_power_level) - reconf_flags |= IEEE80211_CONF_CHANGE_POWER; + /* + * ieee80211_hw_config() will limit to the channel's + * max power and possibly power constraint from AP. + */ + local->user_power_level = new_power_level; + } if (local->hw.conf.radio_enabled != !(data->txpower.disabled)) { local->hw.conf.radio_enabled = !(data->txpower.disabled); @@ -442,7 +467,7 @@ static int ieee80211_ioctl_siwtxpower(struct net_device *dev, ieee80211_led_radio(local, local->hw.conf.radio_enabled); } - if (reconf_flags) + if (reconf || reconf_flags) ieee80211_hw_config(local, reconf_flags); return 0; -- cgit v1.2.3-18-g5258 From a860402d8f1756dae48cdcabe153c974116fc37e Mon Sep 17 00:00:00 2001 From: Michael Buesch Date: Wed, 15 Apr 2009 14:41:22 -0400 Subject: mac80211: quiet beacon loss messages On Sunday 05 April 2009 11:29:38 Michael Buesch wrote: > On Sunday 05 April 2009 11:23:59 Jaswinder Singh Rajput wrote: > > With latest linus tree I am getting, .config file attached: > > > > [ 22.895051] r8169: eth0: link down > > [ 22.897564] ADDRCONF(NETDEV_UP): eth0: link is not ready > > [ 22.928047] ADDRCONF(NETDEV_UP): wlan0: link is not ready > > [ 22.982292] libvirtd used greatest stack depth: 4200 bytes left > > [ 63.709879] wlan0: authenticate with AP 00:11:95:9e:df:f6 > > [ 63.712096] wlan0: authenticated > > [ 63.712127] wlan0: associate with AP 00:11:95:9e:df:f6 > > [ 63.726831] wlan0: RX AssocResp from 00:11:95:9e:df:f6 (capab=0x471 status=0 aid=1) > > [ 63.726855] wlan0: associated > > [ 63.730093] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready > > [ 74.296087] wlan0: no IPv6 routers present > > [ 79.349044] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 119.358200] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 179.354292] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 259.366044] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 359.348292] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 361.953459] packagekitd used greatest stack depth: 4160 bytes left > > [ 478.824258] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 598.813343] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 718.817292] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 838.824567] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 958.815402] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 1078.848434] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 1198.822913] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 1318.824931] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 1438.814157] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 1558.827336] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 1678.823011] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 1798.830589] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 1918.828044] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 2038.827224] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 2116.517152] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 2158.840243] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > [ 2278.827427] wlan0: beacon loss from AP 00:11:95:9e:df:f6 - sending probe request > > > I think this message should only show if CONFIG_MAC80211_VERBOSE_DEBUG is set. > It's kind of expected that we lose a beacon once in a while, so we shouldn't print > verbose messages to the kernel log (even if they are KERN_DEBUG). > > And besides that, I think one can easily remotely trigger this message and flood the logs. > So it should probably _also_ be ratelimited. Something like this: Signed-off-by: Michael Buesch --- net/mac80211/mlme.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) (limited to 'net') diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 7ecda9d59d8..1b14d0204dd 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -945,9 +945,13 @@ void ieee80211_beacon_loss_work(struct work_struct *work) u.mgd.beacon_loss_work); struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; - printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM " - "- sending probe request\n", sdata->dev->name, - sdata->u.mgd.bssid); +#ifdef CONFIG_MAC80211_VERBOSE_DEBUG + if (net_ratelimit()) { + printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM " + "- sending probe request\n", sdata->dev->name, + sdata->u.mgd.bssid); + } +#endif ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL; ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid, @@ -1007,9 +1011,13 @@ static void ieee80211_associated(struct ieee80211_sub_if_data *sdata) (local->hw.conf.flags & IEEE80211_CONF_PS)) && time_after(jiffies, ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) { - printk(KERN_DEBUG "%s: beacon loss from AP %pM " - "- sending probe request\n", - sdata->dev->name, ifmgd->bssid); +#ifdef CONFIG_MAC80211_VERBOSE_DEBUG + if (net_ratelimit()) { + printk(KERN_DEBUG "%s: beacon loss from AP %pM " + "- sending probe request\n", + sdata->dev->name, ifmgd->bssid); + } +#endif ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL; ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid, ifmgd->ssid_len, NULL, 0); -- cgit v1.2.3-18-g5258 From 23a99840d571a237845fd0906bce78e7c76be650 Mon Sep 17 00:00:00 2001 From: Gerrit Renker Date: Tue, 14 Apr 2009 06:32:56 +0200 Subject: mac80211: Fragmentation threshold (typo) mac80211: Fragmentation threshold (typo) ieee80211_ioctl_siwfrag() sets the fragmentation_threshold to 2352 when frame fragmentation is to be disabled, yet the corresponding 'get' function tests for 2353 bytes instead. This causes user-space tools to display a fragmentation threshold of 2352 bytes even if fragmentation has been disabled. Signed-off-by: Gerrit Renker Signed-off-by: John W. Linville --- net/mac80211/wext.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net') diff --git a/net/mac80211/wext.c b/net/mac80211/wext.c index ce9115c1815..959aa8379cc 100644 --- a/net/mac80211/wext.c +++ b/net/mac80211/wext.c @@ -555,7 +555,7 @@ static int ieee80211_ioctl_giwfrag(struct net_device *dev, struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); frag->value = local->fragmentation_threshold; - frag->disabled = (frag->value >= IEEE80211_MAX_RTS_THRESHOLD); + frag->disabled = (frag->value >= IEEE80211_MAX_FRAG_THRESHOLD); frag->fixed = 1; return 0; -- cgit v1.2.3-18-g5258 From 7181d4673710888b6d7084b37b9d77ed4f4e41b2 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 15 Apr 2009 21:33:15 +0200 Subject: mac80211: avoid crashing when no scan sdata Using the scan_sdata variable here is terribly wrong, if there has never been a scan then we fail. However, we need a bandaid... Signed-off-by: Johannes Berg Cc: stable@kernel.org [2.6.29] Signed-off-by: John W. Linville --- net/mac80211/mlme.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'net') diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 1b14d0204dd..dc60804d6dd 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -2113,12 +2113,13 @@ void ieee80211_dynamic_ps_enable_work(struct work_struct *work) struct ieee80211_local *local = container_of(work, struct ieee80211_local, dynamic_ps_enable_work); + /* XXX: using scan_sdata is completely broken! */ struct ieee80211_sub_if_data *sdata = local->scan_sdata; if (local->hw.conf.flags & IEEE80211_CONF_PS) return; - if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) + if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK && sdata) ieee80211_send_nullfunc(local, sdata, 1); local->hw.conf.flags |= IEEE80211_CONF_PS; -- cgit v1.2.3-18-g5258 From 160002fe845218f5789a26954048592c3920ac7b Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Thu, 16 Apr 2009 12:15:38 +0200 Subject: cfg80211: copy hold when replacing BSS When we receive a probe response frame we can replace the BSS struct in our list -- but if that struct is held then we need to hold the new one as well. We really should fix this completely and not replace the struct, but this is a bandaid for now. Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- net/wireless/scan.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'net') diff --git a/net/wireless/scan.c b/net/wireless/scan.c index 2a00e362f5f..4c77669275e 100644 --- a/net/wireless/scan.c +++ b/net/wireless/scan.c @@ -364,6 +364,8 @@ cfg80211_bss_update(struct cfg80211_registered_device *dev, list_replace(&found->list, &res->list); rb_replace_node(&found->rbn, &res->rbn, &dev->bss_tree); + /* XXX: workaround */ + res->hold = found->hold; kref_put(&found->ref, bss_release); found = res; } else if (found) { -- cgit v1.2.3-18-g5258 From cd1658f592a60d028dd2e48d86724b737a82cab0 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Thu, 16 Apr 2009 15:00:58 +0200 Subject: cfg80211: do not replace BSS structs Instead, allocate extra IE memory if necessary. Normally, this isn't even necessary since there's enough space. This is a better way of correcting the "held BSS can disappear" issue, but also a lot more code. It is also necessary for proper auth/assoc BSS handling in the future. Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- net/wireless/core.h | 2 +- net/wireless/scan.c | 42 +++++++++++++++++++++++++++++++++--------- 2 files changed, 34 insertions(+), 10 deletions(-) (limited to 'net') diff --git a/net/wireless/core.h b/net/wireless/core.h index d43daa236ef..0a592e4295f 100644 --- a/net/wireless/core.h +++ b/net/wireless/core.h @@ -90,7 +90,7 @@ struct cfg80211_internal_bss { struct rb_node rbn; unsigned long ts; struct kref ref; - bool hold; + bool hold, ies_allocated; /* must be last because of priv member */ struct cfg80211_bss pub; diff --git a/net/wireless/scan.c b/net/wireless/scan.c index 4c77669275e..2ae65b39b52 100644 --- a/net/wireless/scan.c +++ b/net/wireless/scan.c @@ -58,6 +58,10 @@ static void bss_release(struct kref *ref) bss = container_of(ref, struct cfg80211_internal_bss, ref); if (bss->pub.free_priv) bss->pub.free_priv(&bss->pub); + + if (bss->ies_allocated) + kfree(bss->pub.information_elements); + kfree(bss); } @@ -360,21 +364,41 @@ cfg80211_bss_update(struct cfg80211_registered_device *dev, found = rb_find_bss(dev, res); - if (found && overwrite) { - list_replace(&found->list, &res->list); - rb_replace_node(&found->rbn, &res->rbn, - &dev->bss_tree); - /* XXX: workaround */ - res->hold = found->hold; - kref_put(&found->ref, bss_release); - found = res; - } else if (found) { + if (found) { kref_get(&found->ref); found->pub.beacon_interval = res->pub.beacon_interval; found->pub.tsf = res->pub.tsf; found->pub.signal = res->pub.signal; found->pub.capability = res->pub.capability; found->ts = res->ts; + + /* overwrite IEs */ + if (overwrite) { + size_t used = dev->wiphy.bss_priv_size + sizeof(*res); + size_t ielen = res->pub.len_information_elements; + + if (ksize(found) >= used + ielen) { + memcpy(found->pub.information_elements, + res->pub.information_elements, ielen); + found->pub.len_information_elements = ielen; + } else { + u8 *ies = found->pub.information_elements; + + if (found->ies_allocated) { + if (ksize(ies) < ielen) + ies = krealloc(ies, ielen, + GFP_ATOMIC); + } else + ies = kmalloc(ielen, GFP_ATOMIC); + + if (ies) { + memcpy(ies, res->pub.information_elements, ielen); + found->ies_allocated = true; + found->pub.information_elements = ies; + } + } + } + kref_put(&res->ref, bss_release); } else { /* this "consumes" the reference */ -- cgit v1.2.3-18-g5258 From 60375541f7c8a577b977d344565259776c3acfc1 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 17 Apr 2009 00:54:23 +0200 Subject: mac80211: validate TIM IE length The TIM IE must not be shorter than 4 bytes, so verify that when parsing it. Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- net/mac80211/mlme.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'net') diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index dc60804d6dd..1619e0cd26e 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -441,6 +441,9 @@ static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid) u8 index, indexn1, indexn2; struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim; + if (unlikely(!tim || elems->tim_len < 4)) + return false; + aid &= 0x3fff; index = aid / 8; mask = 1 << (aid & 7); -- cgit v1.2.3-18-g5258