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mac80211: clean up eapol handling in TX path

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The previous patch left only one user of the ieee80211_is_eapol()
function and that user can be eliminated easily by introducing
a new "frame is EAPOL" flag to handle the frame specially (we
already have this information) instead of doing the (expensive)
ieee80211_is_eapol() all the time.

Also, allow unencrypted frames to be sent when they are injected.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg 2007-12-19 01:31:23 +01:00 committed by David S. Miller
parent ce3edf6d0b
commit 678f5f7117
5 changed files with 10 additions and 19 deletions
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1
include/net/mac80211.h
View File

@ -307,6 +307,7 @@ struct ieee80211_tx_control {
* using the through
* set_retry_limit configured
* long retry value */
#define IEEE80211_TXCTL_EAPOL_FRAME (1<<11) /* internal to mac80211 */
u32 flags; /* tx control flags defined
* above */
u8 key_idx; /* keyidx from hw->set_key(), undefined if

2
net/mac80211/ieee80211.c
View File

@ -732,6 +732,8 @@ static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
if (control->flags & IEEE80211_TXCTL_REQUEUE)
pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
if (control->flags & IEEE80211_TXCTL_EAPOL_FRAME)
pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
pkt_data->queue = control->queue;
hdrlen = ieee80211_get_hdrlen_from_skb(skb);

2
net/mac80211/ieee80211_i.h
View File

@ -164,6 +164,7 @@ struct ieee80211_txrx_data {
#define IEEE80211_TXPD_REQ_TX_STATUS BIT(0)
#define IEEE80211_TXPD_DO_NOT_ENCRYPT BIT(1)
#define IEEE80211_TXPD_REQUEUE BIT(2)
#define IEEE80211_TXPD_EAPOL_FRAME BIT(3)
/* Stored in sk_buff->cb */
struct ieee80211_tx_packet_data {
int ifindex;
@ -798,7 +799,6 @@ extern void *mac80211_wiphy_privid; /* for wiphy privid */
extern const unsigned char rfc1042_header[6];
extern const unsigned char bridge_tunnel_header[6];
u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len);
int ieee80211_is_eapol(const struct sk_buff *skb, int hdrlen);
int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
int rate, int erp, int short_preamble);
void mac80211_ev_michael_mic_failure(struct net_device *dev, int keyidx,

7
net/mac80211/tx.c
View File

@ -437,7 +437,8 @@ ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
else if ((key = rcu_dereference(tx->sdata->default_key)))
tx->key = key;
else if (tx->sdata->drop_unencrypted &&
!ieee80211_is_eapol(tx->skb, ieee80211_get_hdrlen(fc))) {
!(tx->u.tx.control->flags & IEEE80211_TXCTL_EAPOL_FRAME) &&
!(tx->flags & IEEE80211_TXRXD_TX_INJECTED)) {
I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
return TXRX_DROP;
} else {
@ -1241,6 +1242,8 @@ int ieee80211_master_start_xmit(struct sk_buff *skb,
control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
control.flags |= IEEE80211_TXCTL_REQUEUE;
if (pkt_data->flags & IEEE80211_TXPD_EAPOL_FRAME)
control.flags |= IEEE80211_TXCTL_EAPOL_FRAME;
control.queue = pkt_data->queue;
ret = ieee80211_tx(odev, skb, &control);
@ -1514,6 +1517,8 @@ int ieee80211_subif_start_xmit(struct sk_buff *skb,
pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
pkt_data->ifindex = dev->ifindex;
if (ethertype == ETH_P_PAE)
pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
skb->dev = local->mdev;
dev->stats.tx_packets++;

17
net/mac80211/util.c
View File

@ -40,10 +40,6 @@ const unsigned char rfc1042_header[] =
const unsigned char bridge_tunnel_header[] =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
/* No encapsulation header if EtherType < 0x600 (=length) */
static const unsigned char eapol_header[] =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x88, 0x8e };
static int rate_list_match(const int *rate_list, int rate)
{
@ -223,19 +219,6 @@ int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
}
EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
int ieee80211_is_eapol(const struct sk_buff *skb, int hdrlen)
{
if (unlikely(skb->len < 10))
return 0;
if (unlikely(skb->len >= hdrlen + sizeof(eapol_header) &&
memcmp(skb->data + hdrlen, eapol_header,
sizeof(eapol_header)) == 0))
return 1;
return 0;
}
void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;