mac80211: move packet flags into packet
commit 8c0c709eea5cbab97fb464cd68b06f24acc58ee1
Author: Johannes Berg <johannes@sipsolutions.net>
Date: Wed Nov 25 17:46:15 2009 +0100
mac80211: move cmntr flag out of rx flags
moved the CMNTR flag into the skb RX flags for
some aggregation cleanups, but this was wrong
since the optimisation this flag tried to make
requires that it is kept across the processing
of multiple interfaces -- which isn't true for
flags in the skb. The patch not only broke the
optimisation, it also introduced a bug: under
some (common!) circumstances the flag will be
set on an already freed skb!
However, investigating this in more detail, I
found that most of the flags that we set should
be per packet, _except_ for this one, due to
a-MPDU processing. Additionally, the flags used
for processing (currently just this one) need
to be reset before processing a new packet.
Since we haven't actually seen bugs reported as
a result of the wrong flags handling (which is
not too surprising -- the only real bug case I
can come up with is an a-MSDU contained in an
a-MPDU), I'll make a different fix for rc.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 8c666e9..0b0e83e 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -315,6 +315,7 @@
static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
int tid;
/* does the frame have a qos control field? */
@@ -323,9 +324,7 @@
/* frame has qos control */
tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
- rx->flags |= IEEE80211_RX_AMSDU;
- else
- rx->flags &= ~IEEE80211_RX_AMSDU;
+ status->rx_flags |= IEEE80211_RX_AMSDU;
} else {
/*
* IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
@@ -387,9 +386,10 @@
ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
{
struct ieee80211_local *local = rx->local;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
struct sk_buff *skb = rx->skb;
- if (likely(!(rx->flags & IEEE80211_RX_IN_SCAN)))
+ if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN)))
return RX_CONTINUE;
if (test_bit(SCAN_HW_SCANNING, &local->scanning))
@@ -783,13 +783,14 @@
ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
/* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
rx->sta->last_seq_ctrl[rx->queue] ==
hdr->seq_ctrl)) {
- if (rx->flags & IEEE80211_RX_RA_MATCH) {
+ if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
rx->local->dot11FrameDuplicateCount++;
rx->sta->num_duplicates++;
}
@@ -822,7 +823,7 @@
if ((!ieee80211_has_fromds(hdr->frame_control) &&
!ieee80211_has_tods(hdr->frame_control) &&
ieee80211_is_data(hdr->frame_control)) ||
- !(rx->flags & IEEE80211_RX_RA_MATCH)) {
+ !(status->rx_flags & IEEE80211_RX_RA_MATCH)) {
/* Drop IBSS frames and frames for other hosts
* silently. */
return RX_DROP_MONITOR;
@@ -879,7 +880,7 @@
* No point in finding a key and decrypting if the frame is neither
* addressed to us nor a multicast frame.
*/
- if (!(rx->flags & IEEE80211_RX_RA_MATCH))
+ if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
return RX_CONTINUE;
/* start without a key */
@@ -1112,7 +1113,7 @@
sta->last_rx = jiffies;
}
- if (!(rx->flags & IEEE80211_RX_RA_MATCH))
+ if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
return RX_CONTINUE;
if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
@@ -1269,6 +1270,7 @@
unsigned int frag, seq;
struct ieee80211_fragment_entry *entry;
struct sk_buff *skb;
+ struct ieee80211_rx_status *status;
hdr = (struct ieee80211_hdr *)rx->skb->data;
fc = hdr->frame_control;
@@ -1368,7 +1370,8 @@
}
/* Complete frame has been reassembled - process it now */
- rx->flags |= IEEE80211_RX_FRAGMENTED;
+ status = IEEE80211_SKB_RXCB(rx->skb);
+ status->rx_flags |= IEEE80211_RX_FRAGMENTED;
out:
if (rx->sta)
@@ -1385,9 +1388,10 @@
{
struct ieee80211_sub_if_data *sdata = rx->sdata;
__le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
- !(rx->flags & IEEE80211_RX_RA_MATCH)))
+ !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
return RX_CONTINUE;
if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
@@ -1548,6 +1552,7 @@
struct sk_buff *skb, *xmit_skb;
struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
struct sta_info *dsta;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
skb = rx->skb;
xmit_skb = NULL;
@@ -1555,7 +1560,7 @@
if ((sdata->vif.type == NL80211_IFTYPE_AP ||
sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
!(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
- (rx->flags & IEEE80211_RX_RA_MATCH) &&
+ (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
if (is_multicast_ether_addr(ehdr->h_dest)) {
/*
@@ -1632,6 +1637,7 @@
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
__le16 fc = hdr->frame_control;
struct sk_buff_head frame_list;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
if (unlikely(!ieee80211_is_data(fc)))
return RX_CONTINUE;
@@ -1639,7 +1645,7 @@
if (unlikely(!ieee80211_is_data_present(fc)))
return RX_DROP_MONITOR;
- if (!(rx->flags & IEEE80211_RX_AMSDU))
+ if (!(status->rx_flags & IEEE80211_RX_AMSDU))
return RX_CONTINUE;
if (ieee80211_has_a4(hdr->frame_control) &&
@@ -1690,6 +1696,7 @@
struct sk_buff *skb = rx->skb, *fwd_skb;
struct ieee80211_local *local = rx->local;
struct ieee80211_sub_if_data *sdata = rx->sdata;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
hdr = (struct ieee80211_hdr *) skb->data;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
@@ -1735,7 +1742,7 @@
mesh_hdr->ttl--;
- if (rx->flags & IEEE80211_RX_RA_MATCH) {
+ if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
if (!mesh_hdr->ttl)
IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
dropped_frames_ttl);
@@ -1945,6 +1952,7 @@
ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
{
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
/*
* From here on, look only at management frames.
@@ -1957,7 +1965,7 @@
if (!ieee80211_is_mgmt(mgmt->frame_control))
return RX_DROP_MONITOR;
- if (!(rx->flags & IEEE80211_RX_RA_MATCH))
+ if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
return RX_DROP_MONITOR;
if (ieee80211_drop_unencrypted_mgmt(rx))
@@ -1972,6 +1980,7 @@
struct ieee80211_local *local = rx->local;
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
int len = rx->skb->len;
if (!ieee80211_is_action(mgmt->frame_control))
@@ -1984,7 +1993,7 @@
if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
return RX_DROP_UNUSABLE;
- if (!(rx->flags & IEEE80211_RX_RA_MATCH))
+ if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
return RX_DROP_UNUSABLE;
switch (mgmt->u.action.category) {
@@ -2080,7 +2089,7 @@
return RX_CONTINUE;
invalid:
- rx->flags |= IEEE80211_MALFORMED_ACTION_FRM;
+ status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
/* will return in the next handlers */
return RX_CONTINUE;
@@ -2102,10 +2111,10 @@
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
{
- struct ieee80211_rx_status *status;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
/* skip known-bad action frames and return them in the next handler */
- if (rx->flags & IEEE80211_MALFORMED_ACTION_FRM)
+ if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
return RX_CONTINUE;
/*
@@ -2114,7 +2123,6 @@
* so userspace can register for those to know whether ones
* it transmitted were processed or returned.
*/
- status = IEEE80211_SKB_RXCB(rx->skb);
if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
rx->skb->data, rx->skb->len,
@@ -2136,6 +2144,7 @@
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
struct sk_buff *nskb;
struct ieee80211_sub_if_data *sdata = rx->sdata;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
if (!ieee80211_is_action(mgmt->frame_control))
return RX_CONTINUE;
@@ -2150,7 +2159,7 @@
* registration mechanisms, but older ones still use cooked
* monitor interfaces so push all frames there.
*/
- if (!(rx->flags & IEEE80211_MALFORMED_ACTION_FRM) &&
+ if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
(sdata->vif.type == NL80211_IFTYPE_AP ||
sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
return RX_DROP_MONITOR;
@@ -2284,8 +2293,13 @@
struct net_device *prev_dev = NULL;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
- if (status->flag & RX_FLAG_INTERNAL_CMTR)
+ /*
+ * If cooked monitor has been processed already, then
+ * don't do it again. If not, set the flag.
+ */
+ if (rx->flags & IEEE80211_RX_CMNTR)
goto out_free_skb;
+ rx->flags |= IEEE80211_RX_CMNTR;
if (skb_headroom(skb) < sizeof(*rthdr) &&
pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
@@ -2341,12 +2355,8 @@
if (prev_dev) {
skb->dev = prev_dev;
netif_receive_skb(skb);
- skb = NULL;
- } else
- goto out_free_skb;
-
- status->flag |= RX_FLAG_INTERNAL_CMTR;
- return;
+ return;
+ }
out_free_skb:
dev_kfree_skb(skb);
@@ -2407,6 +2417,7 @@
* same TID from the same station
*/
rx->skb = skb;
+ rx->flags = 0;
CALL_RXH(ieee80211_rx_h_decrypt)
CALL_RXH(ieee80211_rx_h_check_more_data)
@@ -2477,7 +2488,12 @@
void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
{
struct sk_buff_head frames;
- struct ieee80211_rx_data rx = { };
+ struct ieee80211_rx_data rx = {
+ .sta = sta,
+ .sdata = sta->sdata,
+ .local = sta->local,
+ .queue = tid,
+ };
struct tid_ampdu_rx *tid_agg_rx;
tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
@@ -2486,13 +2502,6 @@
__skb_queue_head_init(&frames);
- /* construct rx struct */
- rx.sta = sta;
- rx.sdata = sta->sdata;
- rx.local = sta->local;
- rx.queue = tid;
- rx.flags |= IEEE80211_RX_RA_MATCH;
-
spin_lock(&tid_agg_rx->reorder_lock);
ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx, &frames);
spin_unlock(&tid_agg_rx->reorder_lock);
@@ -2519,7 +2528,7 @@
compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
if (!(sdata->dev->flags & IFF_PROMISC))
return 0;
- rx->flags &= ~IEEE80211_RX_RA_MATCH;
+ status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
}
break;
case NL80211_IFTYPE_ADHOC:
@@ -2529,15 +2538,15 @@
return 1;
}
else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
- if (!(rx->flags & IEEE80211_RX_IN_SCAN))
+ if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
return 0;
- rx->flags &= ~IEEE80211_RX_RA_MATCH;
+ status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
} else if (!multicast &&
compare_ether_addr(sdata->vif.addr,
hdr->addr1) != 0) {
if (!(sdata->dev->flags & IFF_PROMISC))
return 0;
- rx->flags &= ~IEEE80211_RX_RA_MATCH;
+ status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
} else if (!rx->sta) {
int rate_idx;
if (status->flag & RX_FLAG_HT)
@@ -2555,7 +2564,7 @@
if (!(sdata->dev->flags & IFF_PROMISC))
return 0;
- rx->flags &= ~IEEE80211_RX_RA_MATCH;
+ status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
}
break;
case NL80211_IFTYPE_AP_VLAN:
@@ -2566,9 +2575,9 @@
return 0;
} else if (!ieee80211_bssid_match(bssid,
sdata->vif.addr)) {
- if (!(rx->flags & IEEE80211_RX_IN_SCAN))
+ if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
return 0;
- rx->flags &= ~IEEE80211_RX_RA_MATCH;
+ status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
}
break;
case NL80211_IFTYPE_WDS:
@@ -2602,14 +2611,14 @@
int prepares;
rx->skb = skb;
- rx->flags |= IEEE80211_RX_RA_MATCH;
+ status->rx_flags |= IEEE80211_RX_RA_MATCH;
prepares = prepare_for_handlers(rx, hdr);
if (!prepares)
return false;
if (status->flag & RX_FLAG_MMIC_ERROR) {
- if (rx->flags & IEEE80211_RX_RA_MATCH)
+ if (status->rx_flags & IEEE80211_RX_RA_MATCH)
ieee80211_rx_michael_mic_report(hdr, rx);
return false;
}
@@ -2638,6 +2647,7 @@
static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
struct sk_buff *skb)
{
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_sub_if_data *sdata;
struct ieee80211_hdr *hdr;
@@ -2657,7 +2667,7 @@
if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
- rx.flags |= IEEE80211_RX_IN_SCAN;
+ status->rx_flags |= IEEE80211_RX_IN_SCAN;
if (ieee80211_is_mgmt(fc))
err = skb_linearize(skb);
@@ -2808,6 +2818,8 @@
}
}
+ status->rx_flags = 0;
+
/*
* key references and virtual interfaces are protected using RCU
* and this requires that we are in a read-side RCU section during
