new file mode 100644
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+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * NXP Wireless LAN device driver: station RX data handling
+ *
+ * Copyright 2011-2024 NXP
+ */
+
+#include <uapi/linux/ipv6.h>
+#include <net/ndisc.h>
+#include "decl.h"
+#include "cfg.h"
+#include "util.h"
+#include "fw.h"
+#include "main.h"
+#include "11n_aggr.h"
+#include "11n_rxreorder.h"
+
+/* This function checks if a frame is IPv4 ARP or IPv6 Neighbour advertisement
+ * frame. If frame has both source and destination mac address as same, this
+ * function drops such gratuitous frames.
+ */
+static bool
+nxpwifi_discard_gratuitous_arp(struct nxpwifi_private *priv,
+ struct sk_buff *skb)
+{
+ const struct nxpwifi_arp_eth_header *arp;
+ struct ethhdr *eth;
+ struct ipv6hdr *ipv6;
+ struct icmp6hdr *icmpv6;
+
+ eth = (struct ethhdr *)skb->data;
+ switch (ntohs(eth->h_proto)) {
+ case ETH_P_ARP:
+ arp = (void *)(skb->data + sizeof(struct ethhdr));
+ if (arp->hdr.ar_op == htons(ARPOP_REPLY) ||
+ arp->hdr.ar_op == htons(ARPOP_REQUEST)) {
+ if (!memcmp(arp->ar_sip, arp->ar_tip, 4))
+ return true;
+ }
+ break;
+ case ETH_P_IPV6:
+ ipv6 = (void *)(skb->data + sizeof(struct ethhdr));
+ icmpv6 = (void *)(skb->data + sizeof(struct ethhdr) +
+ sizeof(struct ipv6hdr));
+ if (icmpv6->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
+ if (!memcmp(&ipv6->saddr, &ipv6->daddr,
+ sizeof(struct in6_addr)))
+ return true;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return false;
+}
+
+/* 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 nxpwifi_process_rx_packet(struct nxpwifi_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;
+ u8 adj_rx_rate = 0;
+
+ local_rx_pd = (struct rxpd *)(skb->data);
+
+ rx_pkt_off = le16_to_cpu(local_rx_pd->rx_pkt_offset);
+ rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off;
+
+ if (sizeof(rx_pkt_hdr->eth803_hdr) + sizeof(rfc1042_header) +
+ rx_pkt_off > skb->len) {
+ priv->stats.rx_dropped++;
+ dev_kfree_skb_any(skb);
+ return -EINVAL;
+ }
+
+ if (sizeof(*rx_pkt_hdr) + rx_pkt_off <= skb->len &&
+ ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
+ sizeof(bridge_tunnel_header))) ||
+ (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
+ sizeof(rfc1042_header)) &&
+ rx_pkt_hdr->rfc1042_hdr.snap_type != htons(ETH_P_AARP) &&
+ rx_pkt_hdr->rfc1042_hdr.snap_type != htons(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 &&
+ nxpwifi_discard_gratuitous_arp(priv, skb)) {
+ nxpwifi_dbg(priv->adapter, INFO, "Bypassed Gratuitous ARP\n");
+ dev_kfree_skb_any(skb);
+ return 0;
+ }
+
+ /* Only stash RX bitrate for unicast packets. */
+ if (likely(!is_multicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest))) {
+ priv->rxpd_rate = local_rx_pd->rx_rate;
+ priv->rxpd_htinfo = local_rx_pd->ht_info;
+ }
+
+ if (GET_BSS_ROLE(priv) == NXPWIFI_BSS_ROLE_STA ||
+ GET_BSS_ROLE(priv) == NXPWIFI_BSS_ROLE_UAP) {
+ adj_rx_rate = nxpwifi_adjust_data_rate(priv,
+ local_rx_pd->rx_rate,
+ local_rx_pd->ht_info);
+ nxpwifi_hist_data_add(priv, adj_rx_rate, local_rx_pd->snr,
+ local_rx_pd->nf);
+ }
+
+ ret = nxpwifi_recv_packet(priv, skb);
+ if (ret)
+ nxpwifi_dbg(priv->adapter, ERROR,
+ "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 nxpwifi_process_sta_rx_packet(struct nxpwifi_private *priv,
+ struct sk_buff *skb)
+{
+ struct nxpwifi_adapter *adapter = priv->adapter;
+ int ret = 0;
+ struct rxpd *local_rx_pd;
+ struct rx_packet_hdr *rx_pkt_hdr;
+ u8 ta[ETH_ALEN];
+ u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
+
+ local_rx_pd = (struct rxpd *)(skb->data);
+ rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
+ rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
+ rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
+ seq_num = le16_to_cpu(local_rx_pd->seq_num);
+
+ rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
+
+ if ((rx_pkt_offset + rx_pkt_length) > skb->len ||
+ sizeof(rx_pkt_hdr->eth803_hdr) + rx_pkt_offset > skb->len) {
+ nxpwifi_dbg(adapter, ERROR,
+ "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
+ skb->len, rx_pkt_offset, rx_pkt_length);
+ priv->stats.rx_dropped++;
+ dev_kfree_skb_any(skb);
+ return ret;
+ }
+
+ if (rx_pkt_type == PKT_TYPE_MGMT) {
+ ret = nxpwifi_process_mgmt_packet(priv, skb);
+ if (ret && (ret != -EINPROGRESS))
+ nxpwifi_dbg(adapter, DATA, "Rx of mgmt packet failed");
+ if (ret != -EINPROGRESS)
+ dev_kfree_skb_any(skb);
+ return ret;
+ }
+
+ /* 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) ||
+ !ether_addr_equal_unaligned(priv->curr_addr,
+ rx_pkt_hdr->eth803_hdr.h_dest)) {
+ nxpwifi_process_rx_packet(priv, skb);
+ return ret;
+ }
+
+ if (nxpwifi_queuing_ra_based(priv)) {
+ memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
+ } else {
+ if (rx_pkt_type != PKT_TYPE_BAR &&
+ local_rx_pd->priority < MAX_NUM_TID)
+ priv->rx_seq[local_rx_pd->priority] = seq_num;
+ memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
+ ETH_ALEN);
+ }
+
+ /* Reorder and send to OS */
+ ret = nxpwifi_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
+ ta, (u8)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;
+}