From c4a9fafc77a5318f5ed26c509bbcddf03e18c201 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Wed, 17 Oct 2012 13:56:19 +0200 Subject: cfg80211: fix antenna gain handling No driver initializes chan->max_antenna_gain to something sensible, and the only place where it is being used right now is inside ath9k. This leads to ath9k potentially using less tx power than it can use, which can decrease performance/range in some rare cases. Rather than going through every single driver, this patch initializes chan->orig_mag in wiphy_register(), ignoring whatever value the driver left in there. If a driver for some reason wishes to limit it independent from regulatory rulesets, it can do so internally. Signed-off-by: Felix Fietkau Cc: stable@vger.kernel.org Signed-off-by: Johannes Berg diff --git a/net/wireless/core.c b/net/wireless/core.c index 443d4d7..3f72530 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -526,8 +526,7 @@ int wiphy_register(struct wiphy *wiphy) for (i = 0; i < sband->n_channels; i++) { sband->channels[i].orig_flags = sband->channels[i].flags; - sband->channels[i].orig_mag = - sband->channels[i].max_antenna_gain; + sband->channels[i].orig_mag = INT_MAX; sband->channels[i].orig_mpwr = sband->channels[i].max_power; sband->channels[i].band = band; -- cgit v0.10.2 From 279f0f55249820d8129470c0e104084b252f26f3 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Wed, 17 Oct 2012 13:56:20 +0200 Subject: cfg80211: fix initialization of chan->max_reg_power A few places touch chan->max_power based on updated tx power rules, but forget to do the same to chan->max_reg_power. Signed-off-by: Felix Fietkau Signed-off-by: Johannes Berg diff --git a/net/wireless/reg.c b/net/wireless/reg.c index 3b8cbbc..bcc7d7e 100644 --- a/net/wireless/reg.c +++ b/net/wireless/reg.c @@ -908,7 +908,7 @@ static void handle_channel(struct wiphy *wiphy, map_regdom_flags(reg_rule->flags) | bw_flags; chan->max_antenna_gain = chan->orig_mag = (int) MBI_TO_DBI(power_rule->max_antenna_gain); - chan->max_power = chan->orig_mpwr = + chan->max_reg_power = chan->max_power = chan->orig_mpwr = (int) MBM_TO_DBM(power_rule->max_eirp); return; } @@ -1331,7 +1331,8 @@ static void handle_channel_custom(struct wiphy *wiphy, chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); - chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp); + chan->max_reg_power = chan->max_power = + (int) MBM_TO_DBM(power_rule->max_eirp); } static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band, -- cgit v0.10.2 From 9690fb169b433a66485c808e4fc352b8a0f8d866 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 24 Oct 2012 14:19:53 +0200 Subject: mac80211: use blacklist for duplicate IE check Instead of the current whitelist which accepts duplicates only for the quiet and vendor IEs, use a blacklist of all IEs (that we currently parse) that can't be duplicated. This avoids detecting a beacon as corrupt in the future when new IEs are added that can be duplicated. Cc: stable@vger.kernel.org Signed-off-by: Paul Stewart Signed-off-by: Johannes Berg diff --git a/net/mac80211/util.c b/net/mac80211/util.c index 22ca350..e6e4bda 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -643,13 +643,41 @@ u32 ieee802_11_parse_elems_crc(u8 *start, size_t len, break; } - if (id != WLAN_EID_VENDOR_SPECIFIC && - id != WLAN_EID_QUIET && - test_bit(id, seen_elems)) { - elems->parse_error = true; - left -= elen; - pos += elen; - continue; + switch (id) { + case WLAN_EID_SSID: + case WLAN_EID_SUPP_RATES: + case WLAN_EID_FH_PARAMS: + case WLAN_EID_DS_PARAMS: + case WLAN_EID_CF_PARAMS: + case WLAN_EID_TIM: + case WLAN_EID_IBSS_PARAMS: + case WLAN_EID_CHALLENGE: + case WLAN_EID_RSN: + case WLAN_EID_ERP_INFO: + case WLAN_EID_EXT_SUPP_RATES: + case WLAN_EID_HT_CAPABILITY: + case WLAN_EID_HT_OPERATION: + case WLAN_EID_VHT_CAPABILITY: + case WLAN_EID_VHT_OPERATION: + case WLAN_EID_MESH_ID: + case WLAN_EID_MESH_CONFIG: + case WLAN_EID_PEER_MGMT: + case WLAN_EID_PREQ: + case WLAN_EID_PREP: + case WLAN_EID_PERR: + case WLAN_EID_RANN: + case WLAN_EID_CHANNEL_SWITCH: + case WLAN_EID_EXT_CHANSWITCH_ANN: + case WLAN_EID_COUNTRY: + case WLAN_EID_PWR_CONSTRAINT: + case WLAN_EID_TIMEOUT_INTERVAL: + if (test_bit(id, seen_elems)) { + elems->parse_error = true; + left -= elen; + pos += elen; + continue; + } + break; } if (calc_crc && id < 64 && (filter & (1ULL << id))) -- cgit v0.10.2 From 555cb715be8ef98b8ec362b23dfc254d432a35b1 Mon Sep 17 00:00:00 2001 From: Javier Cardona Date: Wed, 24 Oct 2012 12:43:30 -0700 Subject: mac80211: Only process mesh config header on frames that RA_MATCH Doing otherwise is wrong, and may wreak havoc on the mpp tables, specially if the frame is encrypted. Cc: stable@vger.kernel.org Reported-by: Chaoxing Lin Signed-off-by: Javier Cardona Signed-off-by: Johannes Berg diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 61c621e..1222127 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -1897,7 +1897,8 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata)) return RX_DROP_MONITOR; - if (!ieee80211_is_data(hdr->frame_control)) + if (!ieee80211_is_data(hdr->frame_control) || + !(status->rx_flags & IEEE80211_RX_RA_MATCH)) return RX_CONTINUE; if (!mesh_hdr->ttl) @@ -1941,9 +1942,6 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) } skb_set_queue_mapping(skb, q); - if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) - goto out; - if (!--mesh_hdr->ttl) { IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); return RX_DROP_MONITOR; -- cgit v0.10.2 From 2ac64cd17f9af6d6adaa921bd9846a3c9bb9235c Mon Sep 17 00:00:00 2001 From: Javier Cardona Date: Wed, 24 Oct 2012 12:43:31 -0700 Subject: mac80211: Don't drop frames received with mesh ttl == 1 Prior this fix, those frames were not received, nor forwarded. Fix this to receive and not forward. Signed-off-by: Javier Cardona Signed-off-by: Johannes Berg diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 1222127..f73e0dd 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -1944,7 +1944,7 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) if (!--mesh_hdr->ttl) { IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); - return RX_DROP_MONITOR; + goto out; } if (!ifmsh->mshcfg.dot11MeshForwarding) -- cgit v0.10.2 From f7fbf70ee9db6da6033ae50d100e017ac1f26555 Mon Sep 17 00:00:00 2001 From: Javier Cardona Date: Thu, 25 Oct 2012 11:10:18 -0700 Subject: mac80211: don't inspect Sequence Control field on control frames Per IEEE Std. 802.11-2012, Sec 8.2.4.4.1, the sequence Control field is not present in control frames. We noticed this problem when processing Block Ack Requests. Cc: stable@vger.kernel.org Signed-off-by: Javier Cardona Signed-off-by: Javier Lopez Signed-off-by: Johannes Berg diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index f73e0dd..c6865f2 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -1462,6 +1462,10 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) hdr = (struct ieee80211_hdr *)rx->skb->data; fc = hdr->frame_control; + + if (ieee80211_is_ctl(fc)) + return RX_CONTINUE; + sc = le16_to_cpu(hdr->seq_ctrl); frag = sc & IEEE80211_SCTL_FRAG; -- cgit v0.10.2 From badecb001a310408d3473b1fc2ed5aefd0bc92a9 Mon Sep 17 00:00:00 2001 From: Antonio Quartulli Date: Fri, 26 Oct 2012 18:54:25 +0200 Subject: mac80211: fix SSID copy on IBSS JOIN The 'ssid' field of the cfg80211_ibss_params is a u8 pointer and its length is likely to be less than IEEE80211_MAX_SSID_LEN most of the time. This patch fixes the ssid copy in ieee80211_ibss_join() by using the SSID length to prevent it from reading beyond the string. Cc: stable@vger.kernel.org Signed-off-by: Antonio Quartulli [rewrapped commit message, small rewording] Signed-off-by: Johannes Berg diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c index 5f3620f..bf87c70 100644 --- a/net/mac80211/ibss.c +++ b/net/mac80211/ibss.c @@ -1108,7 +1108,7 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; sdata->u.ibss.ibss_join_req = jiffies; - memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); + memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); sdata->u.ibss.ssid_len = params->ssid_len; mutex_unlock(&sdata->u.ibss.mtx); -- cgit v0.10.2 From 7dd111e8ee10cc6816669eabcad3334447673236 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Thu, 25 Oct 2012 21:51:59 +0200 Subject: wireless: drop invalid mesh address extension frames The mesh header can have address extension by a 4th or a 5th and 6th address, but never both. Drop such frames in 802.11 -> 802.3 conversion along with any frames that have the wrong extension. Cc: stable@vger.kernel.org Reviewed-by: Javier Cardona Signed-off-by: Johannes Berg diff --git a/net/wireless/util.c b/net/wireless/util.c index ef35f4e..45a09de 100644 --- a/net/wireless/util.c +++ b/net/wireless/util.c @@ -312,18 +312,15 @@ EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) { int ae = meshhdr->flags & MESH_FLAGS_AE; - /* 7.1.3.5a.2 */ + /* 802.11-2012, 8.2.4.7.3 */ switch (ae) { + default: case 0: return 6; case MESH_FLAGS_AE_A4: return 12; case MESH_FLAGS_AE_A5_A6: return 18; - case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6): - return 24; - default: - return 6; } } @@ -373,6 +370,8 @@ int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, /* make sure meshdr->flags is on the linear part */ if (!pskb_may_pull(skb, hdrlen + 1)) return -1; + if (meshdr->flags & MESH_FLAGS_AE_A4) + return -1; if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { skb_copy_bits(skb, hdrlen + offsetof(struct ieee80211s_hdr, eaddr1), @@ -397,6 +396,8 @@ int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, /* make sure meshdr->flags is on the linear part */ if (!pskb_may_pull(skb, hdrlen + 1)) return -1; + if (meshdr->flags & MESH_FLAGS_AE_A5_A6) + return -1; if (meshdr->flags & MESH_FLAGS_AE_A4) skb_copy_bits(skb, hdrlen + offsetof(struct ieee80211s_hdr, eaddr1), -- cgit v0.10.2 From 4a4f1a5808c8bb0b72a4f6e5904c53fb8c9cd966 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 26 Oct 2012 00:33:36 +0200 Subject: mac80211: check management frame header length Due to pskb_may_pull() checking the skb length, all non-management frames are checked on input whether their 802.11 header is fully present. Also add that check for management frames and remove a check that is now duplicate. This prevents accessing skb data beyond the frame end. Cc: stable@vger.kernel.org Signed-off-by: Johannes Berg diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index c6865f2..99cdee1 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -1470,7 +1470,6 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) frag = sc & IEEE80211_SCTL_FRAG; if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || - (rx->skb)->len < 24 || is_multicast_ether_addr(hdr->addr1))) { /* not fragmented */ goto out; @@ -2915,10 +2914,15 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) local->dot11ReceivedFragmentCount++; - if (ieee80211_is_mgmt(fc)) - err = skb_linearize(skb); - else + if (ieee80211_is_mgmt(fc)) { + /* drop frame if too short for header */ + if (skb->len < ieee80211_hdrlen(fc)) + err = -ENOBUFS; + else + err = skb_linearize(skb); + } else { err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); + } if (err) { dev_kfree_skb(skb); -- cgit v0.10.2 From 9b395bc3be1cebf0144a127c7e67d56dbdac0930 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 26 Oct 2012 00:36:40 +0200 Subject: mac80211: verify that skb data is present A number of places in the mesh code don't check that the frame data is present and in the skb header when trying to access. Add those checks and the necessary pskb_may_pull() calls. This prevents accessing data that doesn't actually exist. To do this, export ieee80211_get_mesh_hdrlen() to be able to use it in mac80211. Cc: stable@vger.kernel.org Signed-off-by: Johannes Berg diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index f8cd4cf..7d5b600 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -2652,6 +2652,15 @@ unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb); unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc); /** + * ieee80211_get_mesh_hdrlen - get mesh extension header length + * @meshhdr: the mesh extension header, only the flags field + * (first byte) will be accessed + * Returns the length of the extension header, which is always at + * least 6 bytes and at most 18 if address 5 and 6 are present. + */ +unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr); + +/** * DOC: Data path helpers * * In addition to generic utilities, cfg80211 also offers diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 99cdee1..265a032d 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -531,6 +531,11 @@ ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) if (ieee80211_is_action(hdr->frame_control)) { u8 category; + + /* make sure category field is present */ + if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE) + return RX_DROP_MONITOR; + mgmt = (struct ieee80211_mgmt *)hdr; category = mgmt->u.action.category; if (category != WLAN_CATEGORY_MESH_ACTION && @@ -1892,6 +1897,20 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) hdr = (struct ieee80211_hdr *) skb->data; hdrlen = ieee80211_hdrlen(hdr->frame_control); + + /* make sure fixed part of mesh header is there, also checks skb len */ + if (!pskb_may_pull(rx->skb, hdrlen + 6)) + return RX_DROP_MONITOR; + + mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); + + /* make sure full mesh header is there, also checks skb len */ + if (!pskb_may_pull(rx->skb, + hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr))) + return RX_DROP_MONITOR; + + /* reload pointers */ + hdr = (struct ieee80211_hdr *) skb->data; mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); /* frame is in RMC, don't forward */ @@ -1915,9 +1934,12 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) if (is_multicast_ether_addr(hdr->addr1)) { mpp_addr = hdr->addr3; proxied_addr = mesh_hdr->eaddr1; - } else { + } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) { + /* has_a4 already checked in ieee80211_rx_mesh_check */ mpp_addr = hdr->addr4; proxied_addr = mesh_hdr->eaddr2; + } else { + return RX_DROP_MONITOR; } rcu_read_lock(); @@ -2354,6 +2376,10 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx) } break; case WLAN_CATEGORY_SELF_PROTECTED: + if (len < (IEEE80211_MIN_ACTION_SIZE + + sizeof(mgmt->u.action.u.self_prot.action_code))) + break; + switch (mgmt->u.action.u.self_prot.action_code) { case WLAN_SP_MESH_PEERING_OPEN: case WLAN_SP_MESH_PEERING_CLOSE: @@ -2372,6 +2398,10 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx) } break; case WLAN_CATEGORY_MESH_ACTION: + if (len < (IEEE80211_MIN_ACTION_SIZE + + sizeof(mgmt->u.action.u.mesh_action.action_code))) + break; + if (!ieee80211_vif_is_mesh(&sdata->vif)) break; if (mesh_action_is_path_sel(mgmt) && diff --git a/net/wireless/util.c b/net/wireless/util.c index 45a09de..2762e83 100644 --- a/net/wireless/util.c +++ b/net/wireless/util.c @@ -309,7 +309,7 @@ unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb) } EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); -static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) +unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) { int ae = meshhdr->flags & MESH_FLAGS_AE; /* 802.11-2012, 8.2.4.7.3 */ @@ -323,6 +323,7 @@ static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) return 18; } } +EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen); int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, enum nl80211_iftype iftype) -- cgit v0.10.2 From 6dbda2d00d466225f9db1dc695ff852443f28832 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 26 Oct 2012 00:41:23 +0200 Subject: mac80211: make sure data is accessible in EAPOL check The code to allow EAPOL frames even when the station isn't yet marked associated needs to check that the incoming frame is long enough and due to paged RX it also can't assume skb->data contains the right data, it must use skb_copy_bits(). Fix this to avoid using data that doesn't really exist. Cc: stable@vger.kernel.org Signed-off-by: Johannes Berg diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 265a032d..00ade7f 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -888,14 +888,16 @@ ieee80211_rx_h_check(struct ieee80211_rx_data *rx) */ if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION && ieee80211_is_data_present(hdr->frame_control)) { - u16 ethertype; - u8 *payload; - - payload = rx->skb->data + - ieee80211_hdrlen(hdr->frame_control); - ethertype = (payload[6] << 8) | payload[7]; - if (cpu_to_be16(ethertype) == - rx->sdata->control_port_protocol) + unsigned int hdrlen; + __be16 ethertype; + + hdrlen = ieee80211_hdrlen(hdr->frame_control); + + if (rx->skb->len < hdrlen + 8) + return RX_DROP_MONITOR; + + skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2); + if (ethertype == rx->sdata->control_port_protocol) return RX_CONTINUE; } -- cgit v0.10.2