Exemple #1
0
static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
					struct ieee80211_hdr *hdr,
					u16 len,
					u32 ampdu_status,
					struct iwl_rx_mem_buffer *rxb,
					struct ieee80211_rx_status *stats)
{
	/* We only process data packets if the interface is open */
	if (unlikely(!priv->is_open)) {
		IWL_DEBUG_DROP_LIMIT(priv,
		    "Dropping packet while interface is not open.\n");
		return;
	}

	/* In case of HW accelerated crypto and bad decryption, drop */
	if (!priv->cfg->mod_params->sw_crypto &&
	    iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
		return;

	/* Resize SKB from mac header to end of packet */
	skb_reserve(rxb->skb, (void *)hdr - (void *)rxb->skb->data);
	skb_put(rxb->skb, len);

	iwl_update_stats(priv, false, hdr->frame_control, len);
	memcpy(IEEE80211_SKB_RXCB(rxb->skb), stats, sizeof(*stats));
	ieee80211_rx_irqsafe(priv->hw, rxb->skb);
	priv->alloc_rxb_skb--;
	rxb->skb = NULL;
}
static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
					struct ieee80211_hdr *hdr,
					u16 len,
					u32 ampdu_status,
					struct iwl_rx_mem_buffer *rxb,
					struct ieee80211_rx_status *stats)
{
	struct sk_buff *skb;
	int ret = 0;
	__le16 fc = hdr->frame_control;

	/* We only process data packets if the interface is open */
	if (unlikely(!priv->is_open)) {
		IWL_DEBUG_DROP_LIMIT(priv,
		    "Dropping packet while interface is not open.\n");
		return;
	}

	/* In case of HW accelerated crypto and bad decryption, drop */
	if (!priv->cfg->mod_params->sw_crypto &&
	    iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
		return;

	skb = alloc_skb(IWL_LINK_HDR_MAX * 2, GFP_ATOMIC);
	if (!skb) {
		IWL_ERR(priv, "alloc_skb failed\n");
		return;
	}

	skb_reserve(skb, IWL_LINK_HDR_MAX);
	skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);

	/* mac80211 currently doesn't support paged SKB. Convert it to
	 * linear SKB for management frame and data frame requires
	 * software decryption or software defragementation. */
	if (ieee80211_is_mgmt(fc) ||
	    ieee80211_has_protected(fc) ||
	    ieee80211_has_morefrags(fc) ||
	    le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG ||
	    (ieee80211_is_data_qos(fc) &&
	     *ieee80211_get_qos_ctl(hdr) &
	     IEEE80211_QOS_CONTROL_A_MSDU_PRESENT))
		ret = skb_linearize(skb);
	else
		ret = __pskb_pull_tail(skb, min_t(u16, IWL_LINK_HDR_MAX, len)) ?
			 0 : -ENOMEM;

	if (ret) {
		kfree_skb(skb);
		goto out;
	}

	/*
	 * XXX: We cannot touch the page and its virtual memory (hdr) after
	 * here. It might have already been freed by the above skb change.
	 */

	iwl_update_stats(priv, false, fc, len);
	memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));

	ieee80211_rx(priv->hw, skb);
 out:
	priv->alloc_rxb_page--;
	rxb->page = NULL;
}