+/* Filter out unrelated packets, call ieee80211_rx[_mgt]
+ * This function takes over the skb, it should not be used again after calling
+ * this function. */
+void ieee80211_rx_any(struct ieee80211_device *ieee,
+ struct sk_buff *skb, struct ieee80211_rx_stats *stats)
+{
+ struct ieee80211_hdr_4addr *hdr;
+ int is_packet_for_us;
+ u16 fc;
+
+ if (ieee->iw_mode == IW_MODE_MONITOR) {
+ if (!ieee80211_rx(ieee, skb, stats))
+ dev_kfree_skb_irq(skb);
+ return;
+ }
+
+ if (skb->len < sizeof(struct ieee80211_hdr))
+ goto drop_free;
+
+ hdr = (struct ieee80211_hdr_4addr *)skb->data;
+ fc = le16_to_cpu(hdr->frame_ctl);
+
+ if ((fc & IEEE80211_FCTL_VERS) != 0)
+ goto drop_free;
+
+ switch (fc & IEEE80211_FCTL_FTYPE) {
+ case IEEE80211_FTYPE_MGMT:
+ if (skb->len < sizeof(struct ieee80211_hdr_3addr))
+ goto drop_free;
+ ieee80211_rx_mgt(ieee, hdr, stats);
+ dev_kfree_skb_irq(skb);
+ return;
+ case IEEE80211_FTYPE_DATA:
+ break;
+ case IEEE80211_FTYPE_CTL:
+ return;
+ default:
+ return;
+ }
+
+ is_packet_for_us = 0;
+ switch (ieee->iw_mode) {
+ case IW_MODE_ADHOC:
+ /* our BSS and not from/to DS */
+ if (memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) == 0)
+ if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == 0) {
+ /* promisc: get all */
+ if (ieee->dev->flags & IFF_PROMISC)
+ is_packet_for_us = 1;
+ /* to us */
+ else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
+ is_packet_for_us = 1;
+ /* mcast */
+ else if (is_multicast_ether_addr(hdr->addr1))
+ is_packet_for_us = 1;
+ }
+ break;
+ case IW_MODE_INFRA:
+ /* our BSS (== from our AP) and from DS */
+ if (memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) == 0)
+ if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS) {
+ /* promisc: get all */
+ if (ieee->dev->flags & IFF_PROMISC)
+ is_packet_for_us = 1;
+ /* to us */
+ else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
+ is_packet_for_us = 1;
+ /* mcast */
+ else if (is_multicast_ether_addr(hdr->addr1)) {
+ /* not our own packet bcasted from AP */
+ if (memcmp(hdr->addr3, ieee->dev->dev_addr, ETH_ALEN))
+ is_packet_for_us = 1;
+ }
+ }
+ break;
+ default:
+ /* ? */
+ break;
+ }
+
+ if (is_packet_for_us)
+ if (!ieee80211_rx(ieee, skb, stats))
+ dev_kfree_skb_irq(skb);
+ return;
+
+drop_free:
+ dev_kfree_skb_irq(skb);
+ ieee->stats.rx_dropped++;
+ return;
+}
+