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authorJohannes Berg <johannes@sipsolutions.net>2009-07-14 00:33:34 +0200
committerJohn W. Linville <linville@tuxdriver.com>2009-07-27 15:24:06 -0400
commit5061b0c2b9066de426fbc63f1278d2210e789412 (patch)
tree4658cb1a75c2ac37e2eebb3dd67cb3c975297b1f /net/mac80211/tx.c
parent70034918930d2e5b68c09bced637228c50d9561a (diff)
mac80211: cooperate more with network namespaces
There are still two places in mac80211 that hardcode the initial net namespace (init_net). One of them is mandated by cfg80211 and will be removed by a separate patch, the other one is used for finding the network device of a pending packet via its ifindex. Remove the latter use by keeping track of the device pointer itself, via the vif pointer, and avoid it going stale by dropping pending frames for a given interface when the interface is removed. To keep track of the vif pointer for the correct interface, change the info->control.vif pointer's internal use to always be the correct vif, and only move it to the vif the driver expects (or NULL for monitor interfaces and injected packets) right before giving the packet to the driver. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/tx.c')
-rw-r--r--net/mac80211/tx.c75
1 files changed, 30 insertions, 45 deletions
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 2572509d556..ffd3b10f269 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -400,6 +400,7 @@ ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
sta_info_set_tim_bit(sta);
info->control.jiffies = jiffies;
+ info->control.vif = &tx->sdata->vif;
info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
skb_queue_tail(&sta->ps_tx_buf, tx->skb);
return TX_QUEUED;
@@ -696,7 +697,7 @@ ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
* number, if we have no matching interface then we
* neither assign one ourselves nor ask the driver to.
*/
- if (unlikely(!info->control.vif))
+ if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
return TX_CONTINUE;
if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
@@ -1092,6 +1093,7 @@ ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
} else if (*state != HT_AGG_STATE_IDLE) {
/* in progress */
queued = true;
+ info->control.vif = &sdata->vif;
info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
__skb_queue_tail(&tid_tx->pending, skb);
}
@@ -1143,6 +1145,7 @@ static int __ieee80211_tx(struct ieee80211_local *local,
{
struct sk_buff *skb = *skbp, *next;
struct ieee80211_tx_info *info;
+ struct ieee80211_sub_if_data *sdata;
unsigned long flags;
int ret, len;
bool fragm = false;
@@ -1167,7 +1170,24 @@ static int __ieee80211_tx(struct ieee80211_local *local,
next = skb->next;
len = skb->len;
+
+ sdata = vif_to_sdata(info->control.vif);
+
+ switch (sdata->vif.type) {
+ case NL80211_IFTYPE_MONITOR:
+ info->control.vif = NULL;
+ break;
+ case NL80211_IFTYPE_AP_VLAN:
+ info->control.vif = &container_of(sdata->bss,
+ struct ieee80211_sub_if_data, u.ap)->vif;
+ break;
+ default:
+ /* keep */
+ break;
+ }
+
ret = drv_tx(local, skb);
+ info->control.vif = &sdata->vif;
if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
dev_kfree_skb(skb);
ret = NETDEV_TX_OK;
@@ -1386,11 +1406,6 @@ static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
struct ieee80211_sub_if_data *tmp_sdata;
int headroom;
bool may_encrypt;
- enum {
- NOT_MONITOR,
- FOUND_SDATA,
- UNKNOWN_ADDRESS,
- } monitor_iface = NOT_MONITOR;
dev_hold(sdata->dev);
@@ -1424,7 +1439,6 @@ static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
u16 len_rthdr;
info->flags |= IEEE80211_TX_CTL_INJECTED;
- monitor_iface = UNKNOWN_ADDRESS;
len_rthdr = ieee80211_get_radiotap_len(skb->data);
hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
@@ -1454,7 +1468,6 @@ static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
dev_hold(tmp_sdata->dev);
dev_put(sdata->dev);
sdata = tmp_sdata;
- monitor_iface = FOUND_SDATA;
break;
}
}
@@ -1476,13 +1489,7 @@ static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
return;
}
- tmp_sdata = sdata;
- if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
- tmp_sdata = container_of(sdata->bss,
- struct ieee80211_sub_if_data,
- u.ap);
- if (likely(monitor_iface != UNKNOWN_ADDRESS))
- info->control.vif = &tmp_sdata->vif;
+ info->control.vif = &sdata->vif;
ieee80211_select_queue(local, skb);
ieee80211_tx(sdata, skb, false);
@@ -1534,9 +1541,6 @@ int ieee80211_monitor_start_xmit(struct sk_buff *skb,
if (unlikely(skb->len < len_rthdr))
goto fail; /* skb too short for claimed rt header extent */
- /* needed because we set skb device to master */
- skb->iif = dev->ifindex;
-
/*
* fix up the pointers accounting for the radiotap
* header still being in there. We are being given
@@ -1810,8 +1814,6 @@ int ieee80211_subif_start_xmit(struct sk_buff *skb,
nh_pos += hdrlen;
h_pos += hdrlen;
- skb->iif = dev->ifindex;
-
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
@@ -1856,32 +1858,13 @@ static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata;
struct sta_info *sta;
struct ieee80211_hdr *hdr;
- struct net_device *dev;
int ret;
bool result = true;
- /* does interface still exist? */
- dev = dev_get_by_index(&init_net, skb->iif);
- if (!dev) {
- dev_kfree_skb(skb);
- return true;
- }
-
- sdata = IEEE80211_DEV_TO_SUB_IF(dev);
- if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
- sdata = container_of(sdata->bss,
- struct ieee80211_sub_if_data,
- u.ap);
-
- if (unlikely(info->control.vif && info->control.vif != &sdata->vif)) {
- dev_kfree_skb(skb);
- result = true;
- goto out;
- }
+ sdata = vif_to_sdata(info->control.vif);
if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
- /* do not use sdata, it may have been changed above */
- ieee80211_tx(IEEE80211_DEV_TO_SUB_IF(dev), skb, true);
+ ieee80211_tx(sdata, skb, true);
} else {
hdr = (struct ieee80211_hdr *)skb->data;
sta = sta_info_get(local, hdr->addr1);
@@ -1891,9 +1874,6 @@ static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
result = false;
}
- out:
- dev_put(dev);
-
return result;
}
@@ -1921,10 +1901,16 @@ void ieee80211_tx_pending(unsigned long data)
while (!skb_queue_empty(&local->pending[i])) {
struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_sub_if_data *sdata;
+
+ sdata = vif_to_sdata(info->control.vif);
+ dev_hold(sdata->dev);
spin_unlock_irqrestore(&local->queue_stop_reason_lock,
flags);
txok = ieee80211_tx_pending_skb(local, skb);
+ dev_put(sdata->dev);
if (!txok)
__skb_queue_head(&local->pending[i], skb);
spin_lock_irqsave(&local->queue_stop_reason_lock,
@@ -2234,7 +2220,6 @@ void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
skb_set_network_header(skb, 0);
skb_set_transport_header(skb, 0);
- skb->iif = sdata->dev->ifindex;
if (!encrypt)
info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;