From ab6a44ce1da48d35fe7ec95fa068aa617bd7e8dd Mon Sep 17 00:00:00 2001 From: "John W. Linville" Date: Mon, 6 Jun 2011 14:35:27 -0400 Subject: Revert "mac80211: Skip tailroom reservation for full HW-crypto devices" This reverts commit aac6af5534fade2b18682a0b9efad1a6c04c34c6. Conflicts: net/mac80211/key.c That commit has a race that causes a warning, as documented in the thread here: http://marc.info/?l=linux-wireless&m=130717684914101&w=2 Signed-off-by: John W. Linville --- net/mac80211/ieee80211_i.h | 3 --- net/mac80211/key.c | 21 ++------------------- net/mac80211/tx.c | 7 ++++++- 3 files changed, 8 insertions(+), 23 deletions(-) (limited to 'net') diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 2025af52b195..090b0ec1e056 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -775,9 +775,6 @@ struct ieee80211_local { int tx_headroom; /* required headroom for hardware/radiotap */ - /* count for keys needing tailroom space allocation */ - int crypto_tx_tailroom_needed_cnt; - /* Tasklet and skb queue to process calls from IRQ mode. All frames * added to skb_queue will be processed, but frames in * skb_queue_unreliable may be dropped if the total length of these diff --git a/net/mac80211/key.c b/net/mac80211/key.c index 31afd712930d..f825e2f0a57e 100644 --- a/net/mac80211/key.c +++ b/net/mac80211/key.c @@ -101,11 +101,6 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) if (!ret) { key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; - - if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || - (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))) - key->local->crypto_tx_tailroom_needed_cnt--; - return 0; } @@ -161,10 +156,6 @@ static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) key->conf.keyidx, sta ? sta->addr : bcast_addr, ret); key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; - - if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || - (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))) - key->local->crypto_tx_tailroom_needed_cnt++; } void ieee80211_key_removed(struct ieee80211_key_conf *key_conf) @@ -403,10 +394,8 @@ static void __ieee80211_key_destroy(struct ieee80211_key *key) ieee80211_aes_key_free(key->u.ccmp.tfm); if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC) ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); - if (key->local) { + if (key->local) ieee80211_debugfs_key_remove(key); - key->local->crypto_tx_tailroom_needed_cnt--; - } kfree(key); } @@ -468,8 +457,6 @@ int ieee80211_key_link(struct ieee80211_key *key, ieee80211_debugfs_key_add(key); - key->local->crypto_tx_tailroom_needed_cnt++; - ret = ieee80211_key_enable_hw_accel(key); mutex_unlock(&sdata->local->key_mtx); @@ -511,12 +498,8 @@ void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) mutex_lock(&sdata->local->key_mtx); - sdata->local->crypto_tx_tailroom_needed_cnt = 0; - - list_for_each_entry(key, &sdata->key_list, list) { - sdata->local->crypto_tx_tailroom_needed_cnt++; + list_for_each_entry(key, &sdata->key_list, list) ieee80211_key_enable_hw_accel(key); - } mutex_unlock(&sdata->local->key_mtx); } diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 64e0f7587e6d..3104c844b544 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -1480,7 +1480,12 @@ static int ieee80211_skb_resize(struct ieee80211_local *local, { int tail_need = 0; - if (may_encrypt && local->crypto_tx_tailroom_needed_cnt) { + /* + * This could be optimised, devices that do full hardware + * crypto (including TKIP MMIC) need no tailroom... But we + * have no drivers for such devices currently. + */ + if (may_encrypt) { tail_need = IEEE80211_ENCRYPT_TAILROOM; tail_need -= skb_tailroom(skb); tail_need = max_t(int, tail_need, 0); -- cgit v1.2.3-59-g8ed1b From bb77f6341728624314f488ebd8b4c69f2caa33ea Mon Sep 17 00:00:00 2001 From: "John W. Linville" Date: Tue, 7 Jun 2011 14:03:08 -0400 Subject: Revert "mac80211: stop queues before rate control updation" This reverts commit 1d38c16ce4156f63b45abbd09dd28ca2ef5172b4. The mac80211 maintainer raised complaints about abuse of the CSA stop reason, and about whether this patch actually serves its intended purpose at all. Signed-off-by: John W. Linville --- net/mac80211/mlme.c | 6 ------ 1 file changed, 6 deletions(-) (limited to 'net') diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 456cccf26b51..d595265d6c22 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -232,9 +232,6 @@ static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata, WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type)); } - ieee80211_stop_queues_by_reason(&sdata->local->hw, - IEEE80211_QUEUE_STOP_REASON_CSA); - /* channel_type change automatically detected */ ieee80211_hw_config(local, 0); @@ -248,9 +245,6 @@ static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata, rcu_read_unlock(); } - ieee80211_wake_queues_by_reason(&sdata->local->hw, - IEEE80211_QUEUE_STOP_REASON_CSA); - ht_opmode = le16_to_cpu(hti->operation_mode); /* if bss configuration changed store the new one */ -- cgit v1.2.3-59-g8ed1b From 57a27e1d6a3bb9ad4efeebd3a8c71156d6207536 Mon Sep 17 00:00:00 2001 From: Luciano Coelho Date: Tue, 7 Jun 2011 20:42:26 +0300 Subject: nl80211: fix overflow in ssid_len When one of the SSID's length passed in a scan or sched_scan request is larger than 255, there will be an overflow in the u8 that is used to store the length before checking. This causes the check to fail and we overrun the buffer when copying the SSID. Fix this by checking the nl80211 attribute length before copying it to the struct. This is a follow up for the previous commit 208c72f4fe44fe09577e7975ba0e7fa0278f3d03, which didn't fix the problem entirely. Reported-by: Ido Yariv Signed-off-by: Luciano Coelho Signed-off-by: John W. Linville --- net/wireless/nl80211.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) (limited to 'net') diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 88a565f130a5..98fa8eb6cc4b 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -3406,11 +3406,11 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info) i = 0; if (info->attrs[NL80211_ATTR_SCAN_SSIDS]) { nla_for_each_nested(attr, info->attrs[NL80211_ATTR_SCAN_SSIDS], tmp) { - request->ssids[i].ssid_len = nla_len(attr); - if (request->ssids[i].ssid_len > IEEE80211_MAX_SSID_LEN) { + if (nla_len(attr) > IEEE80211_MAX_SSID_LEN) { err = -EINVAL; goto out_free; } + request->ssids[i].ssid_len = nla_len(attr); memcpy(request->ssids[i].ssid, nla_data(attr), nla_len(attr)); i++; } @@ -3572,12 +3572,11 @@ static int nl80211_start_sched_scan(struct sk_buff *skb, if (info->attrs[NL80211_ATTR_SCAN_SSIDS]) { nla_for_each_nested(attr, info->attrs[NL80211_ATTR_SCAN_SSIDS], tmp) { - request->ssids[i].ssid_len = nla_len(attr); - if (request->ssids[i].ssid_len > - IEEE80211_MAX_SSID_LEN) { + if (nla_len(attr) > IEEE80211_MAX_SSID_LEN) { err = -EINVAL; goto out_free; } + request->ssids[i].ssid_len = nla_len(attr); memcpy(request->ssids[i].ssid, nla_data(attr), nla_len(attr)); i++; -- cgit v1.2.3-59-g8ed1b From f3209bea110cade12e2b133da8b8499689cb0e2e Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 8 Jun 2011 13:27:29 +0200 Subject: mac80211: fix IBSS teardown race Ignacy reports that sometimes after leaving an IBSS joining a new one didn't work because there still were stations on the list. He fixed it by flushing stations when attempting to join a new IBSS, but this shouldn't be happening in the first case. When I looked into it I saw a race condition in teardown that could cause stations to be added after flush, and thus cause this situation. Ignacy confirms that after applying my patch he hasn't seen this happen again. Reported-by: Ignacy Gawedzki Debugged-by: Ignacy Gawedzki Tested-by: Ignacy Gawedzki Cc: stable@kernel.org Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- net/mac80211/ibss.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'net') diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c index 421eaa6b0c2b..56c24cabf26d 100644 --- a/net/mac80211/ibss.c +++ b/net/mac80211/ibss.c @@ -965,6 +965,10 @@ int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) mutex_lock(&sdata->u.ibss.mtx); + sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; + memset(sdata->u.ibss.bssid, 0, ETH_ALEN); + sdata->u.ibss.ssid_len = 0; + active_ibss = ieee80211_sta_active_ibss(sdata); if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { @@ -999,8 +1003,6 @@ int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) kfree_skb(skb); skb_queue_purge(&sdata->skb_queue); - memset(sdata->u.ibss.bssid, 0, ETH_ALEN); - sdata->u.ibss.ssid_len = 0; del_timer_sync(&sdata->u.ibss.timer); -- cgit v1.2.3-59-g8ed1b