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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 "cfg.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "11n_aggr.h"
#include "11n_rxreorder.h"
/*
* Drop gratuitous IPv4 ARP and IPv6 neighbour advertisements when
* source and destination addresses are identical.
*/
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;
}
/*
* Process a received data packet.
* Convert 802.2/LLC/SNAP to Ethernet II when appropriate, trim the
* rxpd and extra headers, optionally drop gratuitous ARP/NA, cache
* RX rate for unicast, then deliver to the stack.
*/
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->rate_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->rate_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;
}
/*
* Process a received buffer on the STA path.
* Validate RxPD and lengths, handle monitor/mgmt frames, fast-path
* non-unicast frames, and feed unicast data into 11n reorder/BA logic.
*/
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 (priv->adapter->enable_net_mon && rx_pkt_type == PKT_TYPE_802DOT11) {
ret = nxpwifi_recv_packet_to_monif(priv, skb);
if (ret)
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;
}
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