[PATCH v2] mac80211: Encrypt "Group addressed privacy" action frames
From: Masashi Honma <hidden>
Date: 2016-06-21 15:25:50
Subsystem:
802.11 (including cfg80211/nl80211), mac80211, the rest · Maintainers:
Johannes Berg, Linus Torvalds
Previously, the action frames to group address was not encrypted. But [1] "Table 8-38 Category values" indicates "Mesh" and "Multihop" category action frames should be encrypted (Group addressed privacy == yes). And the encyption key should be MGTK ([1] 10.13 Group addressed robust management frame procedures). So this patch modifies the code to make it suitable for spec. [1] IEEE Std 802.11-2012 Signed-off-by: Masashi Honma <redacted> --- include/linux/ieee80211.h | 20 ++++++++++++++++++++ net/mac80211/tx.c | 7 +++++-- 2 files changed, 25 insertions(+), 2 deletions(-)
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index b118744..3ff7d3f 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h@@ -19,6 +19,7 @@ #include <linux/types.h> #include <linux/if_ether.h> +#include <linux/etherdevice.h> #include <asm/byteorder.h> #include <asm/unaligned.h>
@@ -2487,6 +2488,25 @@ static inline bool ieee80211_is_public_action(struct ieee80211_hdr *hdr, } /** + * ieee80211_is_group_privacy_action - check if frame is a group addressed + * privacy action frame + * @hdr: the frame + */ +static inline bool ieee80211_is_group_privacy_action(struct ieee80211_hdr *hdr) +{ + struct ieee80211_mgmt *mgmt; + + if (!ieee80211_is_action(hdr->frame_control) || + !is_multicast_ether_addr(hdr->addr1)) + return false; + + mgmt = (struct ieee80211_mgmt *)hdr; + + return mgmt->u.action.category == WLAN_CATEGORY_MESH_ACTION || + mgmt->u.action.category == WLAN_CATEGORY_MULTIHOP_ACTION; +} + +/** * ieee80211_tu_to_usec - convert time units (TU) to microseconds * @tu: the TUs */
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 2030443..5ad205e 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c@@ -590,6 +590,9 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) else if (tx->sta && (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) tx->key = key; + else if (ieee80211_is_group_privacy_action(hdr) && + (key = rcu_dereference(tx->sdata->default_multicast_key))) + tx->key = key; else if (ieee80211_is_mgmt(hdr->frame_control) && is_multicast_ether_addr(hdr->addr1) && ieee80211_is_robust_mgmt_frame(tx->skb) &&
@@ -608,7 +611,6 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) bool skip_hw = false; /* TODO: add threshold stuff again */ - switch (tx->key->conf.cipher) { case WLAN_CIPHER_SUITE_WEP40: case WLAN_CIPHER_SUITE_WEP104:
@@ -622,7 +624,8 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) case WLAN_CIPHER_SUITE_GCMP_256: if (!ieee80211_is_data_present(hdr->frame_control) && !ieee80211_use_mfp(hdr->frame_control, tx->sta, - tx->skb)) + tx->skb) && + !ieee80211_is_group_privacy_action(hdr)) tx->key = NULL; else skip_hw = (tx->key->conf.flags &
--
2.5.0