/**
* eth_type_trans - determine the packet's protocol ID.
* @skb: received socket data
* @dev: receiving network device
*
* The rule here is that we
* assume 802.3 if the type field is short enough to be a length.
* This is normal practice and works for any 'now in use' protocol.
*/
__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
{
unsigned short _service_access_point;
const unsigned short *sap;
const struct ethhdr *eth;
skb->dev = dev;
skb_reset_mac_header(skb);
skb_pull_inline(skb, ETH_HLEN);
eth = eth_hdr(skb);
if (unlikely(is_multicast_ether_addr(eth->h_dest))) {
if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
skb->pkt_type = PACKET_BROADCAST;
else
skb->pkt_type = PACKET_MULTICAST;
}
else if (unlikely(!ether_addr_equal_64bits(eth->h_dest,
dev->dev_addr)))
skb->pkt_type = PACKET_OTHERHOST;
/*
* Some variants of DSA tagging don't have an ethertype field
* at all, so we check here whether one of those tagging
* variants has been configured on the receiving interface,
* and if so, set skb->protocol without looking at the packet.
*/
if (unlikely(netdev_uses_dsa_tags(dev)))
return htons(ETH_P_DSA);
if (unlikely(netdev_uses_trailer_tags(dev)))
return htons(ETH_P_TRAILER);
if (likely(ntohs(eth->h_proto) >= ETH_P_802_3_MIN))
return eth->h_proto;
/*
* This is a magic hack to spot IPX packets. Older Novell breaks
* the protocol design and runs IPX over 802.3 without an 802.2 LLC
* layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
* won't work for fault tolerant netware but does for the rest.
*/
sap = skb_header_pointer(skb, 0, sizeof(*sap), &_service_access_point);
if (sap && *sap == 0xFFFF)
return htons(ETH_P_802_3);
/*
* Real 802.2 LLC
*/
return htons(ETH_P_802_2);
}
/* This is necessary only for a number of stats, see the caller. */
static int
il3945_is_network_packet(struct il_priv *il, struct ieee80211_hdr *header)
{
/* Filter incoming packets to determine if they are targeted toward
* this network, discarding packets coming from ourselves */
switch (il->iw_mode) {
case NL80211_IFTYPE_ADHOC: /* Header: Dest. | Source | BSSID */
/* packets to our IBSS update information */
return ether_addr_equal_64bits(header->addr3, il->bssid);
case NL80211_IFTYPE_STATION: /* Header: Dest. | AP{BSSID} | Source */
/* packets to our IBSS update information */
return ether_addr_equal_64bits(header->addr2, il->bssid);
default:
return 1;
}
}
/* For sw LPS*/
void rtl_swlps_beacon(struct ieee80211_hw *hw, void *data, unsigned int len)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
struct ieee80211_hdr *hdr = data;
struct ieee80211_tim_ie *tim_ie;
u8 *tim;
u8 tim_len;
bool u_buffed;
bool m_buffed;
if (mac->opmode != NL80211_IFTYPE_STATION)
return;
if (!rtlpriv->psc.swctrl_lps)
return;
if (rtlpriv->mac80211.link_state != MAC80211_LINKED)
return;
if (!rtlpriv->psc.sw_ps_enabled)
return;
if (rtlpriv->psc.fwctrl_lps)
return;
if (likely(!(hw->conf.flags & IEEE80211_CONF_PS)))
return;
/* check if this really is a beacon */
if (!ieee80211_is_beacon(hdr->frame_control))
return;
/* min. beacon length + FCS_LEN */
if (len <= 40 + FCS_LEN)
return;
/* and only beacons from the associated BSSID, please */
if (!ether_addr_equal_64bits(hdr->addr3, rtlpriv->mac80211.bssid))
return;
rtlpriv->psc.last_beacon = jiffies;
tim = rtl_find_ie(data, len - FCS_LEN, WLAN_EID_TIM);
if (!tim)
return;
if (tim[1] < sizeof(*tim_ie))
return;
tim_len = tim[1];
tim_ie = (struct ieee80211_tim_ie *) &tim[2];
if (!WARN_ON_ONCE(!hw->conf.ps_dtim_period))
rtlpriv->psc.dtim_counter = tim_ie->dtim_count;
/* Check whenever the PHY can be turned off again. */
/* 1. What about buffered unicast traffic for our AID? */
u_buffed = ieee80211_check_tim(tim_ie, tim_len,
rtlpriv->mac80211.assoc_id);
/* 2. Maybe the AP wants to send multicast/broadcast data? */
m_buffed = tim_ie->bitmap_ctrl & 0x01;
rtlpriv->psc.multi_buffered = m_buffed;
/* unicast will process by mac80211 through
* set ~IEEE80211_CONF_PS, So we just check
* multicast frames here */
if (!m_buffed) {
/* back to low-power land. and delay is
* prevent null power save frame tx fail */
queue_delayed_work(rtlpriv->works.rtl_wq,
&rtlpriv->works.ps_work, MSECS(5));
} else {
RT_TRACE(rtlpriv, COMP_POWER, DBG_DMESG,
"u_bufferd: %x, m_buffered: %x\n", u_buffed, m_buffed);
}
}
bool ath_is_mybeacon(struct ath_common *common, struct ieee80211_hdr *hdr)
{
return ieee80211_is_beacon(hdr->frame_control) &&
!is_zero_ether_addr(common->curbssid) &&
ether_addr_equal_64bits(hdr->addr3, common->curbssid);
}