/*
* This function processes the received packet and forwards it
* to kernel/upper layer.
*
* This function parses through the received packet and determines
* if it is a debug packet or normal packet.
*
* For non-debug packets, the function chops off unnecessary leading
* header bytes, reconstructs the packet as an ethernet frame or
* 802.2/llc/snap frame as required, and sends it to kernel/upper layer.
*
* The completion callback is called after processing in complete.
*/
int mwifiex_process_rx_packet(struct mwifiex_private *priv,
struct sk_buff *skb)
{
int ret;
struct rx_packet_hdr *rx_pkt_hdr;
struct rxpd *local_rx_pd;
int hdr_chop;
struct ethhdr *eth;
u16 rx_pkt_off, rx_pkt_len;
u8 *offset;
local_rx_pd = (struct rxpd *) (skb->data);
rx_pkt_off = le16_to_cpu(local_rx_pd->rx_pkt_offset);
rx_pkt_len = le16_to_cpu(local_rx_pd->rx_pkt_length);
rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off;
if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
sizeof(bridge_tunnel_header))) ||
(!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
sizeof(rfc1042_header)) &&
ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
/*
* Replace the 803 header and rfc1042 header (llc/snap) with an
* EthernetII header, keep the src/dst and snap_type
* (ethertype).
* The firmware only passes up SNAP frames converting
* all RX Data from 802.11 to 802.2/LLC/SNAP frames.
* To create the Ethernet II, just move the src, dst address
* right before the snap_type.
*/
eth = (struct ethhdr *)
((u8 *) &rx_pkt_hdr->eth803_hdr
+ sizeof(rx_pkt_hdr->eth803_hdr) +
sizeof(rx_pkt_hdr->rfc1042_hdr)
- sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
- sizeof(rx_pkt_hdr->eth803_hdr.h_source)
- sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source,
sizeof(eth->h_source));
memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
sizeof(eth->h_dest));
/* Chop off the rxpd + the excess memory from the 802.2/llc/snap
header that was removed. */
hdr_chop = (u8 *) eth - (u8 *) local_rx_pd;
} else {
/* Chop off the rxpd */
hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
(u8 *) local_rx_pd;
}
/* Chop off the leading header bytes so the it points to the start of
either the reconstructed EthII frame or the 802.2/llc/snap frame */
skb_pull(skb, hdr_chop);
if (priv->hs2_enabled &&
mwifiex_discard_gratuitous_arp(priv, skb)) {
dev_dbg(priv->adapter->dev, "Bypassed Gratuitous ARP\n");
dev_kfree_skb_any(skb);
return 0;
}
if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
ntohs(rx_pkt_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) {
offset = (u8 *)local_rx_pd + rx_pkt_off;
mwifiex_process_tdls_action_frame(priv, offset, rx_pkt_len);
}
priv->rxpd_rate = local_rx_pd->rx_rate;
priv->rxpd_htinfo = local_rx_pd->ht_info;
ret = mwifiex_recv_packet(priv, skb);
if (ret == -1)
dev_err(priv->adapter->dev, "recv packet failed\n");
return ret;
}
/*
* This function processes the received buffer.
*
* The function looks into the RxPD and performs sanity tests on the
* received buffer to ensure its a valid packet, before processing it
* further. If the packet is determined to be aggregated, it is
* de-aggregated accordingly. Non-unicast packets are sent directly to
* the kernel/upper layers. Unicast packets are handed over to the
* Rx reordering routine if 11n is enabled.
*
* The completion callback is called after processing in complete.
*/
int mwifiex_process_sta_rx_packet(struct mwifiex_adapter *adapter,
struct sk_buff *skb)
{
int ret = 0;
struct rxpd *local_rx_pd;
struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
struct rx_packet_hdr *rx_pkt_hdr;
u8 ta[ETH_ALEN];
u16 rx_pkt_type;
struct mwifiex_private *priv =
mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
rx_info->bss_type);
if (!priv)
return -1;
local_rx_pd = (struct rxpd *) (skb->data);
rx_pkt_type = local_rx_pd->rx_pkt_type;
rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd +
local_rx_pd->rx_pkt_offset);
if ((local_rx_pd->rx_pkt_offset + local_rx_pd->rx_pkt_length) >
(u16) skb->len) {
dev_err(adapter->dev, "wrong rx packet: len=%d,"
" rx_pkt_offset=%d, rx_pkt_length=%d\n", skb->len,
local_rx_pd->rx_pkt_offset, local_rx_pd->rx_pkt_length);
priv->stats.rx_dropped++;
dev_kfree_skb_any(skb);
return ret;
}
if (local_rx_pd->rx_pkt_type == PKT_TYPE_AMSDU) {
struct sk_buff_head list;
struct sk_buff *rx_skb;
__skb_queue_head_init(&list);
skb_pull(skb, local_rx_pd->rx_pkt_offset);
skb_trim(skb, local_rx_pd->rx_pkt_length);
ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
priv->wdev->iftype, 0, false);
while (!skb_queue_empty(&list)) {
rx_skb = __skb_dequeue(&list);
ret = mwifiex_recv_packet(adapter, rx_skb);
if (ret == -1)
dev_err(adapter->dev, "Rx of A-MSDU failed");
}
return 0;
}
/*
* If the packet is not an unicast packet then send the packet
* directly to os. Don't pass thru rx reordering
*/
if (!IS_11N_ENABLED(priv) ||
memcmp(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN)) {
mwifiex_process_rx_packet(adapter, skb);
return ret;
}
if (mwifiex_queuing_ra_based(priv)) {
memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
} else {
if (rx_pkt_type != PKT_TYPE_BAR)
priv->rx_seq[local_rx_pd->priority] =
local_rx_pd->seq_num;
memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
ETH_ALEN);
}
/* Reorder and send to OS */
ret = mwifiex_11n_rx_reorder_pkt(priv, local_rx_pd->seq_num,
local_rx_pd->priority, ta,
(u8) local_rx_pd->rx_pkt_type,
skb);
if (ret || (rx_pkt_type == PKT_TYPE_BAR))
dev_kfree_skb_any(skb);
if (ret)
priv->stats.rx_dropped++;
return ret;
}
/*
* This function processes the received packet and forwards it
* to kernel/upper layer.
*
* This function parses through the received packet and determines
* if it is a debug packet or normal packet.
*
* For non-debug packets, the function chops off unnecessary leading
* header bytes, reconstructs the packet as an ethernet frame or
* 802.2/llc/snap frame as required, and sends it to kernel/upper layer.
*
* The completion callback is called after processing in complete.
*/
int mwifiex_process_rx_packet(struct mwifiex_adapter *adapter,
struct sk_buff *skb)
{
int ret;
struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
struct mwifiex_private *priv =
mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
rx_info->bss_type);
struct rx_packet_hdr *rx_pkt_hdr;
struct rxpd *local_rx_pd;
int hdr_chop;
struct ethhdr *eth_hdr;
u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
local_rx_pd = (struct rxpd *) (skb->data);
rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd +
local_rx_pd->rx_pkt_offset);
if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) {
/*
* Replace the 803 header and rfc1042 header (llc/snap) with an
* EthernetII header, keep the src/dst and snap_type
* (ethertype).
* The firmware only passes up SNAP frames converting
* all RX Data from 802.11 to 802.2/LLC/SNAP frames.
* To create the Ethernet II, just move the src, dst address
* right before the snap_type.
*/
eth_hdr = (struct ethhdr *)
((u8 *) &rx_pkt_hdr->eth803_hdr
+ sizeof(rx_pkt_hdr->eth803_hdr) +
sizeof(rx_pkt_hdr->rfc1042_hdr)
- sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
- sizeof(rx_pkt_hdr->eth803_hdr.h_source)
- sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
memcpy(eth_hdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
sizeof(eth_hdr->h_source));
memcpy(eth_hdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
sizeof(eth_hdr->h_dest));
/* Chop off the rxpd + the excess memory from the 802.2/llc/snap
header that was removed. */
hdr_chop = (u8 *) eth_hdr - (u8 *) local_rx_pd;
} else {
/* Chop off the rxpd */
hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
(u8 *) local_rx_pd;
}
/* Chop off the leading header bytes so the it points to the start of
either the reconstructed EthII frame or the 802.2/llc/snap frame */
skb_pull(skb, hdr_chop);
priv->rxpd_rate = local_rx_pd->rx_rate;
priv->rxpd_htinfo = local_rx_pd->ht_info;
ret = mwifiex_recv_packet(adapter, skb);
if (ret == -1)
dev_err(adapter->dev, "recv packet failed\n");
return ret;
}
/*
* This function processes the packet received on AP interface.
*
* The function looks into the RxPD and performs sanity tests on the
* received buffer to ensure its a valid packet before processing it
* further. If the packet is determined to be aggregated, it is
* de-aggregated accordingly. Then skb is passed to AP packet forwarding logic.
*
* The completion callback is called after processing is complete.
*/
int mwifiex_process_uap_rx_packet(struct mwifiex_adapter *adapter,
struct sk_buff *skb)
{
int ret;
struct uap_rxpd *uap_rx_pd;
struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
struct rx_packet_hdr *rx_pkt_hdr;
u16 rx_pkt_type;
u8 ta[ETH_ALEN], pkt_type;
struct mwifiex_sta_node *node;
struct mwifiex_private *priv =
mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
rx_info->bss_type);
if (!priv)
return -1;
uap_rx_pd = (struct uap_rxpd *)(skb->data);
rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {
dev_err(adapter->dev,
"wrong rx packet: len=%d, offset=%d, length=%d\n",
skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset),
le16_to_cpu(uap_rx_pd->rx_pkt_length));
priv->stats.rx_dropped++;
if (adapter->if_ops.data_complete)
adapter->if_ops.data_complete(adapter, skb);
else
dev_kfree_skb_any(skb);
return 0;
}
if (le16_to_cpu(uap_rx_pd->rx_pkt_type) == PKT_TYPE_AMSDU) {
struct sk_buff_head list;
struct sk_buff *rx_skb;
__skb_queue_head_init(&list);
skb_pull(skb, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
skb_trim(skb, le16_to_cpu(uap_rx_pd->rx_pkt_length));
ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
priv->wdev->iftype, 0, false);
while (!skb_queue_empty(&list)) {
rx_skb = __skb_dequeue(&list);
ret = mwifiex_recv_packet(adapter, rx_skb);
if (ret)
dev_err(adapter->dev,
"AP:Rx A-MSDU failed");
}
return 0;
}
memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) {
node = mwifiex_get_sta_entry(priv, ta);
if (node)
node->rx_seq[uap_rx_pd->priority] =
le16_to_cpu(uap_rx_pd->seq_num);
}
if (!priv->ap_11n_enabled ||
(!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&
(le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {
ret = mwifiex_handle_uap_rx_forward(priv, skb);
return ret;
}
/* Reorder and send to kernel */
pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);
ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num),
uap_rx_pd->priority, ta, pkt_type,
skb);
if (ret || (rx_pkt_type == PKT_TYPE_BAR)) {
if (adapter->if_ops.data_complete)
adapter->if_ops.data_complete(adapter, skb);
else
dev_kfree_skb_any(skb);
}
if (ret)
priv->stats.rx_dropped++;
return ret;
}
