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mac80211: restructuring data Rx handlers
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This patch restructures the Rx handlers chain by incorporating previously
handlers ieee80211_rx_h_802_1x_pae and ieee80211_rx_h_drop_unencrypted
into ieee80211_rx_h_data, already in 802.3 form. this scheme follows more
precisely after the IEEE802.11 data plane archituecture, and will prevent
code duplication to IEEE8021.11n A-MSDU handler.

added function:
 - ieee80211_data_to_8023: transfering 802.11 data frames to 802.3 frame
 - ieee80211_deliver_skb: delivering the 802.3 frames to upper stack
eliminated handlers:
 - ieee80211_rx_h_drop_unencrypted: now function ieee80211_drop_unencrypted
 - ieee80211_rx_h_802_1x_pae: now function ieee80211_802_1x_pae
changed handlers:
 - ieee80211_rx_h_data: now contains calls to four above function

Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Ron Rindjunsky authored and David S. Miller committed Jan 28, 2008
1 parent ece8edd commit 76ee65b
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Showing 4 changed files with 86 additions and 66 deletions.
2 changes: 1 addition & 1 deletion net/mac80211/ieee80211_i.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -792,7 +792,7 @@ 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 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,
Expand Down
124 changes: 77 additions & 47 deletions net/mac80211/rx.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -962,80 +962,74 @@ ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
return TXRX_CONTINUE;
}

static ieee80211_txrx_result
ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
static int
ieee80211_drop_802_1x_pae(struct ieee80211_txrx_data *rx, int hdrlen)
{
if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb, hdrlen) &&
rx->sdata->type != IEEE80211_IF_TYPE_STA &&
(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
return TXRX_CONTINUE;
return 0;

if (unlikely(rx->sdata->ieee802_1x &&
(rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
(rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
(!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
!ieee80211_is_eapol(rx->skb))) {
!ieee80211_is_eapol(rx->skb, hdrlen))) {
#ifdef CONFIG_MAC80211_DEBUG
struct ieee80211_hdr *hdr =
(struct ieee80211_hdr *) rx->skb->data;
DECLARE_MAC_BUF(mac);
printk(KERN_DEBUG "%s: dropped frame from %s"
" (unauthorized port)\n", rx->dev->name,
print_mac(mac, hdr->addr2));
printk(KERN_DEBUG "%s: dropped frame "
"(unauthorized port)\n", rx->dev->name);
#endif /* CONFIG_MAC80211_DEBUG */
return TXRX_DROP;
return -EACCES;
}

return TXRX_CONTINUE;
return 0;
}

static ieee80211_txrx_result
ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
static int
ieee80211_drop_unencrypted(struct ieee80211_txrx_data *rx, int hdrlen)
{
/*
* Pass through unencrypted frames if the hardware has
* decrypted them already.
*/
if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
return TXRX_CONTINUE;
return 0;

/* Drop unencrypted frames if key is set. */
if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
(rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
(rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
(rx->key || rx->sdata->drop_unencrypted) &&
(rx->sdata->eapol == 0 || !ieee80211_is_eapol(rx->skb)))) {
(rx->sdata->eapol == 0 ||
!ieee80211_is_eapol(rx->skb, hdrlen)))) {
if (net_ratelimit())
printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
"encryption\n", rx->dev->name);
return TXRX_DROP;
return -EACCES;
}
return TXRX_CONTINUE;
return 0;
}

static ieee80211_txrx_result
ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
static int
ieee80211_data_to_8023(struct ieee80211_txrx_data *rx)
{
struct net_device *dev = rx->dev;
struct ieee80211_local *local = rx->local;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
u16 fc, hdrlen, ethertype;
u8 *payload;
u8 dst[ETH_ALEN];
u8 src[ETH_ALEN];
struct sk_buff *skb = rx->skb, *skb2;
struct sk_buff *skb = rx->skb;
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
DECLARE_MAC_BUF(mac);
DECLARE_MAC_BUF(mac2);
DECLARE_MAC_BUF(mac3);
DECLARE_MAC_BUF(mac4);

fc = rx->fc;
if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
return TXRX_CONTINUE;

if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
return TXRX_DROP;
return -1;

hdrlen = ieee80211_get_hdrlen(fc);

Expand Down Expand Up @@ -1064,7 +1058,7 @@ ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
print_mac(mac, hdr->addr1),
print_mac(mac2, hdr->addr2),
print_mac(mac3, hdr->addr3));
return TXRX_DROP;
return -1;
}
break;
case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
Expand All @@ -1081,7 +1075,7 @@ ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
print_mac(mac2, hdr->addr2),
print_mac(mac3, hdr->addr3),
print_mac(mac4, hdr->addr4));
return TXRX_DROP;
return -1;
}
break;
case IEEE80211_FCTL_FROMDS:
Expand All @@ -1092,7 +1086,7 @@ ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
if (sdata->type != IEEE80211_IF_TYPE_STA ||
(is_multicast_ether_addr(dst) &&
!compare_ether_addr(src, dev->dev_addr)))
return TXRX_DROP;
return -1;
break;
case 0:
/* DA SA BSSID */
Expand All @@ -1108,21 +1102,20 @@ ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
print_mac(mac2, hdr->addr2),
print_mac(mac3, hdr->addr3));
}
return TXRX_DROP;
return -1;
}
break;
}

payload = skb->data + hdrlen;

if (unlikely(skb->len - hdrlen < 8)) {
if (net_ratelimit()) {
printk(KERN_DEBUG "%s: RX too short data frame "
"payload\n", dev->name);
}
return TXRX_DROP;
return -1;
}

payload = skb->data + hdrlen;
ethertype = (payload[6] << 8) | payload[7];

if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
Expand All @@ -1143,21 +1136,28 @@ ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
memcpy(ehdr->h_source, src, ETH_ALEN);
ehdr->h_proto = len;
}
skb->dev = dev;
return 0;
}

skb2 = NULL;
static void
ieee80211_deliver_skb(struct ieee80211_txrx_data *rx)
{
struct net_device *dev = rx->dev;
struct ieee80211_local *local = rx->local;
struct sk_buff *skb, *xmit_skb;
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

dev->stats.rx_packets++;
dev->stats.rx_bytes += skb->len;
skb = rx->skb;
xmit_skb = NULL;

if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
|| sdata->type == IEEE80211_IF_TYPE_VLAN) &&
(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
if (is_multicast_ether_addr(skb->data)) {
/* send multicast frames both to higher layers in
* local net stack and back to the wireless media */
skb2 = skb_copy(skb, GFP_ATOMIC);
if (!skb2 && net_ratelimit())
xmit_skb = skb_copy(skb, GFP_ATOMIC);
if (!xmit_skb && net_ratelimit())
printk(KERN_DEBUG "%s: failed to clone "
"multicast frame\n", dev->name);
} else {
Expand All @@ -1172,7 +1172,7 @@ ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
* AP, so send the frame directly to it and
* do not pass the frame to local net stack.
*/
skb2 = skb;
xmit_skb = skb;
skb = NULL;
}
if (dsta)
Expand All @@ -1187,13 +1187,45 @@ ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
netif_rx(skb);
}

if (skb2) {
if (xmit_skb) {
/* send to wireless media */
skb2->protocol = __constant_htons(ETH_P_802_3);
skb_set_network_header(skb2, 0);
skb_set_mac_header(skb2, 0);
dev_queue_xmit(skb2);
xmit_skb->protocol = __constant_htons(ETH_P_802_3);
skb_set_network_header(xmit_skb, 0);
skb_set_mac_header(xmit_skb, 0);
dev_queue_xmit(xmit_skb);
}
}

static ieee80211_txrx_result
ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
{
struct net_device *dev = rx->dev;
u16 fc;
int err, hdrlen;

fc = rx->fc;
if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
return TXRX_CONTINUE;

if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
return TXRX_DROP;

hdrlen = ieee80211_get_hdrlen(fc);

if ((ieee80211_drop_802_1x_pae(rx, hdrlen)) ||
(ieee80211_drop_unencrypted(rx, hdrlen)))
return TXRX_DROP;

err = ieee80211_data_to_8023(rx);
if (unlikely(err))
return TXRX_DROP;

rx->skb->dev = dev;

dev->stats.rx_packets++;
dev->stats.rx_bytes += rx->skb->len;

ieee80211_deliver_skb(rx);

return TXRX_QUEUED;
}
Expand Down Expand Up @@ -1347,8 +1379,6 @@ ieee80211_rx_handler ieee80211_rx_handlers[] =
* are not passed to user space by these functions
*/
ieee80211_rx_h_remove_qos_control,
ieee80211_rx_h_802_1x_pae,
ieee80211_rx_h_drop_unencrypted,
ieee80211_rx_h_data,
ieee80211_rx_h_mgmt,
NULL
Expand Down
12 changes: 7 additions & 5 deletions net/mac80211/tx.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -420,7 +420,6 @@ ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
return TXRX_CONTINUE;
}


static ieee80211_txrx_result
ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
{
Expand All @@ -433,13 +432,15 @@ ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
return ieee80211_tx_h_multicast_ps_buf(tx);
}




static ieee80211_txrx_result
ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
{
struct ieee80211_key *key;
const struct ieee80211_hdr *hdr;
u16 fc;

hdr = (const struct ieee80211_hdr *) tx->skb->data;
fc = le16_to_cpu(hdr->frame_control);

if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
tx->key = NULL;
Expand All @@ -448,7 +449,8 @@ 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 &&
!(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
!(tx->sdata->eapol &&
ieee80211_is_eapol(tx->skb, ieee80211_get_hdrlen(fc)))) {
I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
return TXRX_DROP;
} else {
Expand Down
14 changes: 1 addition & 13 deletions net/mac80211/util.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -218,23 +218,11 @@ 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 ieee80211_is_eapol(const struct sk_buff *skb, int hdrlen)
{
const struct ieee80211_hdr *hdr;
u16 fc;
int hdrlen;

if (unlikely(skb->len < 10))
return 0;

hdr = (const struct ieee80211_hdr *) skb->data;
fc = le16_to_cpu(hdr->frame_control);

if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
return 0;

hdrlen = ieee80211_get_hdrlen(fc);

if (unlikely(skb->len >= hdrlen + sizeof(eapol_header) &&
memcmp(skb->data + hdrlen, eapol_header,
sizeof(eapol_header)) == 0))
Expand Down

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