extractedLnx/linux-2.6.31/drivers/staging/rtl8187se/ieee80211/ieee80211_rx.c_ieee80211_rx.c

int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
		 struct ieee80211_rx_stats *rx_stats)
{
	struct net_device *dev = ieee->dev;
	//struct r8180_priv *priv = (struct r8180_priv *)ieee80211_priv(dev);
	struct ieee80211_hdr *hdr;
	//struct ieee80211_hdr_3addr_QOS *hdr;

	size_t hdrlen;
	u16 fc, type, stype, sc;
	struct net_device_stats *stats;
	unsigned int frag;
	u8 *payload;
	u16 ethertype;
#ifdef NOT_YET
	struct net_device *wds = NULL;
	struct sk_buff *skb2 = NULL;
	struct net_device *wds = NULL;
	int frame_authorized = 0;
	int from_assoc_ap = 0;
	void *sta = NULL;
#endif
//	u16 QOS_ctl = 0;
	u8 dst[ETH_ALEN];
	u8 src[ETH_ALEN];
	u8 bssid[ETH_ALEN];
	struct ieee80211_crypt_data *crypt = NULL;
	int keyidx = 0;

	//Added for mesh by Lawrence.
#ifdef _RTL8187_EXT_PATCH_
	u8 status;
	u32 flags;
#endif
	// cheat the the hdr type
	hdr = (struct ieee80211_hdr *)skb->data;
	stats = &ieee->stats;

	if (skb->len < 10) {
		printk(KERN_INFO "%s: SKB length < 10\n",
		       dev->name);
		goto rx_dropped;
	}

	fc = le16_to_cpu(hdr->frame_ctl);
	type = WLAN_FC_GET_TYPE(fc);
	stype = WLAN_FC_GET_STYPE(fc);
	sc = le16_to_cpu(hdr->seq_ctl);

	frag = WLAN_GET_SEQ_FRAG(sc);

//YJ,add,080828,for keep alive
	if((fc & IEEE80211_FCTL_TODS) != IEEE80211_FCTL_TODS)
	{
		if(!memcmp(hdr->addr1,dev->dev_addr, ETH_ALEN))
		{
			ieee->NumRxUnicast++;
		}
	}
	else
	{
		if(!memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN))
		{
			ieee->NumRxUnicast++;
		}
	}
//YJ,add,080828,for keep alive,end

#ifdef _RTL8187_EXT_PATCH_
	if((ieee->iw_mode == ieee->iw_ext_mode) && (ieee->ext_patch_ieee80211_rx_frame_get_hdrlen))
	{
		hdrlen = ieee->ext_patch_ieee80211_rx_frame_get_hdrlen(ieee, skb);
		if(skb->len < hdrlen)
			goto rx_dropped;
	}
	else
#endif
	hdrlen = ieee80211_get_hdrlen(fc);

#ifdef NOT_YET
#if WIRELESS_EXT > 15
	/* Put this code here so that we avoid duplicating it in all
	 * Rx paths. - Jean II */
#ifdef IW_WIRELESS_SPY		/* defined in iw_handler.h */
	/* If spy monitoring on */
	if (iface->spy_data.spy_number > 0) {
		struct iw_quality wstats;
		wstats.level = rx_stats->signal;
		wstats.noise = rx_stats->noise;
		wstats.updated = 6;	/* No qual value */
		/* Update spy records */
		wireless_spy_update(dev, hdr->addr2, &wstats);
	}
#endif /* IW_WIRELESS_SPY */
#endif /* WIRELESS_EXT > 15 */
	hostap_update_rx_stats(local->ap, hdr, rx_stats);
#endif

#if WIRELESS_EXT > 15
	if (ieee->iw_mode == IW_MODE_MONITOR) {
		ieee80211_monitor_rx(ieee, skb, rx_stats);
		stats->rx_packets++;
		stats->rx_bytes += skb->len;
		return 1;
	}
#endif
	if (ieee->host_decrypt) {
		int idx = 0;
		if (skb->len >= hdrlen + 3)
			idx = skb->data[hdrlen + 3] >> 6;
		crypt = ieee->crypt[idx];
#ifdef NOT_YET
		sta = NULL;

		/* Use station specific key to override default keys if the
		 * receiver address is a unicast address ("individual RA"). If
		 * bcrx_sta_key parameter is set, station specific key is used
		 * even with broad/multicast targets (this is against IEEE
		 * 802.11, but makes it easier to use different keys with
		 * stations that do not support WEP key mapping). */

		if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
			(void) hostap_handle_sta_crypto(local, hdr, &crypt,
							&sta);
#endif

		/* allow NULL decrypt to indicate an station specific override
		 * for default encryption */
		if (crypt && (crypt->ops == NULL ||
			      crypt->ops->decrypt_mpdu == NULL))
			crypt = NULL;

		if (!crypt && (fc & IEEE80211_FCTL_WEP)) {
			/* This seems to be triggered by some (multicast?)
			 * frames from other than current BSS, so just drop the
			 * frames silently instead of filling system log with
			 * these reports. */
			IEEE80211_DEBUG_DROP("Decryption failed (not set)"
					     " (SA=" MAC_FMT ")\n",
					     MAC_ARG(hdr->addr2));
			ieee->ieee_stats.rx_discards_undecryptable++;
			goto rx_dropped;
		}
	}

	if (skb->len < IEEE80211_DATA_HDR3_LEN)
		goto rx_dropped;

#ifdef _RTL8187_EXT_PATCH_
	if( ieee->iw_mode == ieee->iw_ext_mode && ieee->ext_patch_ieee80211_rx_mgt_update_expire )
		ieee->ext_patch_ieee80211_rx_mgt_update_expire( ieee, skb );
#endif

	// if QoS enabled, should check the sequence for each of the AC
	if (is_duplicate_packet(ieee, hdr))
		goto rx_dropped;


	if (type == IEEE80211_FTYPE_MGMT) {

	#if 0
		if ( stype == IEEE80211_STYPE_AUTH &&
		    fc & IEEE80211_FCTL_WEP && ieee->host_decrypt &&
		    (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0)
		{
			printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
			       "from " MAC_FMT "\n", dev->name,
			       MAC_ARG(hdr->addr2));
			/* TODO: could inform hostapd about this so that it
			 * could send auth failure report */
			goto rx_dropped;
		}
	#endif


		if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
			goto rx_dropped;
		else
			goto rx_exit;
	}
#ifdef _RTL8187_EXT_PATCH_
	if((ieee->iw_mode == ieee->iw_ext_mode) && ieee->ext_patch_ieee80211_rx_on_rx)
	{
		if(ieee->ext_patch_ieee80211_rx_on_rx(ieee, skb, rx_stats, type, stype)==0)
		{
			goto rx_exit;
		}
	}
#endif

	/* Data frame - extract src/dst addresses */
	switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
	case IEEE80211_FCTL_FROMDS:
		memcpy(dst, hdr->addr1, ETH_ALEN);
		memcpy(src, hdr->addr3, ETH_ALEN);
		memcpy(bssid,hdr->addr2,ETH_ALEN);
		break;
	case IEEE80211_FCTL_TODS:
		memcpy(dst, hdr->addr3, ETH_ALEN);
		memcpy(src, hdr->addr2, ETH_ALEN);
		memcpy(bssid,hdr->addr1,ETH_ALEN);
		break;
	case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
		if (skb->len < IEEE80211_DATA_HDR4_LEN)
			goto rx_dropped;
		memcpy(dst, hdr->addr3, ETH_ALEN);
		memcpy(src, hdr->addr4, ETH_ALEN);
		memcpy(bssid, ieee->current_network.bssid, ETH_ALEN);
		break;
	case 0:
		memcpy(dst, hdr->addr1, ETH_ALEN);
		memcpy(src, hdr->addr2, ETH_ALEN);
		memcpy(bssid,hdr->addr3,ETH_ALEN);
		break;
	}

#ifdef NOT_YET
	if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
		goto rx_dropped;
	if (wds) {
		skb->dev = dev = wds;
		stats = hostap_get_stats(dev);
	}

	if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
	    (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS &&
	    ieee->stadev &&
	    memcmp(hdr->addr2, ieee->assoc_ap_addr, ETH_ALEN) == 0) {
		/* Frame from BSSID of the AP for which we are a client */
		skb->dev = dev = ieee->stadev;
		stats = hostap_get_stats(dev);
		from_assoc_ap = 1;
	}
#endif

	dev->last_rx = jiffies;

#ifdef NOT_YET
	if ((ieee->iw_mode == IW_MODE_MASTER ||
	     ieee->iw_mode == IW_MODE_REPEAT) &&
	    !from_assoc_ap) {
		switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
					     wds != NULL)) {
		case AP_RX_CONTINUE_NOT_AUTHORIZED:
			frame_authorized = 0;
			break;
		case AP_RX_CONTINUE:
			frame_authorized = 1;
			break;
		case AP_RX_DROP:
			goto rx_dropped;
		case AP_RX_EXIT:
			goto rx_exit;
		}
	}
#endif

#ifdef _RTL8187_EXT_PATCH_
	if((ieee->iw_mode == ieee->iw_ext_mode) && ieee->ext_patch_ieee80211_rx_is_valid_framectl)
	{
		if(ieee->ext_patch_ieee80211_rx_is_valid_framectl(ieee, fc, type, stype)==0)
			goto rx_dropped;
	}
	else
#endif
	/* Nullfunc frames may have PS-bit set, so they must be passed to
	 * hostap_handle_sta_rx() before being dropped here. */
	if (stype != IEEE80211_STYPE_DATA &&
	    stype != IEEE80211_STYPE_DATA_CFACK &&
	    stype != IEEE80211_STYPE_DATA_CFPOLL &&
	    stype != IEEE80211_STYPE_DATA_CFACKPOLL&&
	    stype != IEEE80211_STYPE_QOS_DATA//add by David,2006.8.4
	    ) {
		if (stype != IEEE80211_STYPE_NULLFUNC)
			IEEE80211_DEBUG_DROP(
				"RX: dropped data frame "
				"with no data (type=0x%02x, "
				"subtype=0x%02x, len=%d)\n",
				type, stype, skb->len);
		goto rx_dropped;
	}
	if(memcmp(bssid,ieee->current_network.bssid,ETH_ALEN)) {
		goto rx_dropped;
	}

	ieee->NumRxDataInPeriod++;
	ieee->NumRxOkTotal++;
	/* skb: hdr + (possibly fragmented, possibly encrypted) payload */

	if (ieee->host_decrypt && (fc & IEEE80211_FCTL_WEP) &&
	    (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
		goto rx_dropped;

	hdr = (struct ieee80211_hdr *) skb->data;

	/* skb: hdr + (possibly fragmented) plaintext payload */
	// PR: FIXME: hostap has additional conditions in the "if" below:
	// ieee->host_decrypt && (fc & IEEE80211_FCTL_WEP) &&
	if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
		int flen;
		struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
		IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);

		if (!frag_skb) {
			IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
					"Rx cannot get skb from fragment "
					"cache (morefrag=%d seq=%u frag=%u)\n",
					(fc & IEEE80211_FCTL_MOREFRAGS) != 0,
					WLAN_GET_SEQ_SEQ(sc), frag);
			goto rx_dropped;
		}
		flen = skb->len;
		if (frag != 0)
			flen -= hdrlen;

		if (frag_skb->tail + flen > frag_skb->end) {
			printk(KERN_WARNING "%s: host decrypted and "
			       "reassembled frame did not fit skb\n",
			       dev->name);
			ieee80211_frag_cache_invalidate(ieee, hdr);
			goto rx_dropped;
		}

		if (frag == 0) {
			/* copy first fragment (including full headers) into
			 * beginning of the fragment cache skb */
			memcpy(skb_put(frag_skb, flen), skb->data, flen);
		} else {
			/* append frame payload to the end of the fragment
			 * cache skb */
			memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
			       flen);
		}
		dev_kfree_skb_any(skb);
		skb = NULL;

		if (fc & IEEE80211_FCTL_MOREFRAGS) {
			/* more fragments expected - leave the skb in fragment
			 * cache for now; it will be delivered to upper layers
			 * after all fragments have been received */
			goto rx_exit;
		}

		/* this was the last fragment and the frame will be
		 * delivered, so remove skb from fragment cache */
		skb = frag_skb;
		hdr = (struct ieee80211_hdr *) skb->data;
		ieee80211_frag_cache_invalidate(ieee, hdr);
	}

	/* skb: hdr + (possible reassembled) full MSDU payload; possibly still
	 * encrypted/authenticated */
	if (ieee->host_decrypt && (fc & IEEE80211_FCTL_WEP) &&
	    ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
		goto rx_dropped;

	hdr = (struct ieee80211_hdr *) skb->data;
	if (crypt && !(fc & IEEE80211_FCTL_WEP) && !ieee->open_wep) {
		if (/*ieee->ieee802_1x &&*/
		    ieee80211_is_eapol_frame(ieee, skb, hdrlen)) {

#ifdef CONFIG_IEEE80211_DEBUG
			/* pass unencrypted EAPOL frames even if encryption is
			 * configured */
			struct eapol *eap = (struct eapol *)(skb->data +
				24);
			IEEE80211_DEBUG_EAP("RX: IEEE 802.1X EAPOL frame: %s\n",
						eap_get_type(eap->type));
#endif
		} else {
			IEEE80211_DEBUG_DROP(
				"encryption configured, but RX "
				"frame not encrypted (SA=" MAC_FMT ")\n",
				MAC_ARG(hdr->addr2));
			goto rx_dropped;
		}
	}

#ifdef CONFIG_IEEE80211_DEBUG
	if (crypt && !(fc & IEEE80211_FCTL_WEP) &&
	    ieee80211_is_eapol_frame(ieee, skb, hdrlen)) {
			struct eapol *eap = (struct eapol *)(skb->data +
				24);
			IEEE80211_DEBUG_EAP("RX: IEEE 802.1X EAPOL frame: %s\n",
						eap_get_type(eap->type));
	}
#endif

	if (crypt && !(fc & IEEE80211_FCTL_WEP) && !ieee->open_wep &&
	    !ieee80211_is_eapol_frame(ieee, skb, hdrlen)) {
		IEEE80211_DEBUG_DROP(
			"dropped unencrypted RX data "
			"frame from " MAC_FMT
			" (drop_unencrypted=1)\n",
			MAC_ARG(hdr->addr2));
		goto rx_dropped;
	}
/*
	if(ieee80211_is_eapol_frame(ieee, skb, hdrlen)) {
		printk(KERN_WARNING "RX: IEEE802.1X EPAOL frame!\n");
	}
*/
	/* skb: hdr + (possible reassembled) full plaintext payload */
	payload = skb->data + hdrlen;
	ethertype = (payload[6] << 8) | payload[7];

#ifdef NOT_YET
	/* If IEEE 802.1X is used, check whether the port is authorized to send
	 * the received frame. */
	if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
		if (ethertype == ETH_P_PAE) {
			printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
			       dev->name);
			if (ieee->hostapd && ieee->apdev) {
				/* Send IEEE 802.1X frames to the user
				 * space daemon for processing */
				prism2_rx_80211(ieee->apdev, skb, rx_stats,
						PRISM2_RX_MGMT);
				ieee->apdevstats.rx_packets++;
				ieee->apdevstats.rx_bytes += skb->len;
				goto rx_exit;
			}
		} else if (!frame_authorized) {
			printk(KERN_DEBUG "%s: dropped frame from "
			       "unauthorized port (IEEE 802.1X): "
			       "ethertype=0x%04x\n",
			       dev->name, ethertype);
			goto rx_dropped;
		}
	}
#endif

#ifdef _RTL8187_EXT_PATCH_
	if((ieee->iw_mode == ieee->iw_ext_mode) && ieee->ext_patch_ieee80211_rx_process_dataframe)
	{
	//Added for mesh rx interrupt.
		//spin_lock_irqsave(&ieee->lock,flags);
		status = ieee->ext_patch_ieee80211_rx_process_dataframe(ieee, skb, rx_stats);
		//spin_unlock_irqrestore(&ieee->lock,flags);

		if(status)
//	if(ieee->ext_patch_ieee80211_rx_process_dataframe(ieee, skb, rx_stats))
			goto rx_exit;
		else
			goto rx_dropped;
	}
#endif

	/* convert hdr + possible LLC headers into Ethernet header */
	if (skb->len - hdrlen >= 8 &&
	    ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
	      ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
	     memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
		/* remove RFC1042 or Bridge-Tunnel encapsulation and
		 * replace EtherType */
		skb_pull(skb, hdrlen + SNAP_SIZE);
		memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
		memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
	} else {
		u16 len;
		/* Leave Ethernet header part of hdr and full payload */
		skb_pull(skb, hdrlen);
		len = htons(skb->len);
		memcpy(skb_push(skb, 2), &len, 2);
		memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
		memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
	}

#ifdef NOT_YET
	if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
		    IEEE80211_FCTL_TODS) &&
	    skb->len >= ETH_HLEN + ETH_ALEN) {
		/* Non-standard frame: get addr4 from its bogus location after
		 * the payload */
		memcpy(skb->data + ETH_ALEN,
		       skb->data + skb->len - ETH_ALEN, ETH_ALEN);
		skb_trim(skb, skb->len - ETH_ALEN);
	}
#endif

	stats->rx_packets++;
	stats->rx_bytes += skb->len;

#ifdef NOT_YET
	if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
	    ieee->ap->bridge_packets) {
		if (dst[0] & 0x01) {
			/* copy multicast frame both to the higher layers and
			 * to the wireless media */
			ieee->ap->bridged_multicast++;
			skb2 = skb_clone(skb, GFP_ATOMIC);
			if (skb2 == NULL)
				printk(KERN_DEBUG "%s: skb_clone failed for "
				       "multicast frame\n", dev->name);
		} else if (hostap_is_sta_assoc(ieee->ap, dst)) {
			/* send frame directly to the associated STA using
			 * wireless media and not passing to higher layers */
			ieee->ap->bridged_unicast++;
			skb2 = skb;
			skb = NULL;
		}
	}

	if (skb2 != NULL) {
		/* send to wireless media */
		skb2->protocol = __constant_htons(ETH_P_802_3);
		skb2->mac.raw = skb2->nh.raw = skb2->data;
		/* skb2->nh.raw = skb2->data + ETH_HLEN; */
		skb2->dev = dev;
		dev_queue_xmit(skb2);
	}

#endif
	if (skb) {
		skb->protocol = eth_type_trans(skb, dev);
		memset(skb->cb, 0, sizeof(skb->cb));
		skb->dev = dev;
		skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
		ieee->last_rx_ps_time = jiffies;
		netif_rx(skb);
	}

 rx_exit:
#ifdef NOT_YET
	if (sta)
		hostap_handle_sta_release(sta);
#endif
	return 1;

 rx_dropped:
	stats->rx_dropped++;

	/* Returning 0 indicates to caller that we have not handled the SKB--
	 * so it is still allocated and can be used again by underlying
	 * hardware as a DMA target */
	return 0;
}