272 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * NXP Wireless LAN device driver: station RX data handling4 *5 * Copyright 2011-2020 NXP6 */7 8#include <uapi/linux/ipv6.h>9#include <net/ndisc.h>10#include "decl.h"11#include "ioctl.h"12#include "util.h"13#include "fw.h"14#include "main.h"15#include "11n_aggr.h"16#include "11n_rxreorder.h"17 18/* This function checks if a frame is IPv4 ARP or IPv6 Neighbour advertisement19 * frame. If frame has both source and destination mac address as same, this20 * function drops such gratuitous frames.21 */22static bool23mwifiex_discard_gratuitous_arp(struct mwifiex_private *priv,24 struct sk_buff *skb)25{26 const struct mwifiex_arp_eth_header *arp;27 struct ethhdr *eth;28 struct ipv6hdr *ipv6;29 struct icmp6hdr *icmpv6;30 31 eth = (struct ethhdr *)skb->data;32 switch (ntohs(eth->h_proto)) {33 case ETH_P_ARP:34 arp = (void *)(skb->data + sizeof(struct ethhdr));35 if (arp->hdr.ar_op == htons(ARPOP_REPLY) ||36 arp->hdr.ar_op == htons(ARPOP_REQUEST)) {37 if (!memcmp(arp->ar_sip, arp->ar_tip, 4))38 return true;39 }40 break;41 case ETH_P_IPV6:42 ipv6 = (void *)(skb->data + sizeof(struct ethhdr));43 icmpv6 = (void *)(skb->data + sizeof(struct ethhdr) +44 sizeof(struct ipv6hdr));45 if (NDISC_NEIGHBOUR_ADVERTISEMENT == icmpv6->icmp6_type) {46 if (!memcmp(&ipv6->saddr, &ipv6->daddr,47 sizeof(struct in6_addr)))48 return true;49 }50 break;51 default:52 break;53 }54 55 return false;56}57 58/*59 * This function processes the received packet and forwards it60 * to kernel/upper layer.61 *62 * This function parses through the received packet and determines63 * if it is a debug packet or normal packet.64 *65 * For non-debug packets, the function chops off unnecessary leading66 * header bytes, reconstructs the packet as an ethernet frame or67 * 802.2/llc/snap frame as required, and sends it to kernel/upper layer.68 *69 * The completion callback is called after processing in complete.70 */71int mwifiex_process_rx_packet(struct mwifiex_private *priv,72 struct sk_buff *skb)73{74 int ret;75 struct rx_packet_hdr *rx_pkt_hdr;76 struct rxpd *local_rx_pd;77 int hdr_chop;78 struct ethhdr *eth;79 u16 rx_pkt_off, rx_pkt_len;80 u8 *offset;81 u8 adj_rx_rate = 0;82 83 local_rx_pd = (struct rxpd *) (skb->data);84 85 rx_pkt_off = le16_to_cpu(local_rx_pd->rx_pkt_offset);86 rx_pkt_len = le16_to_cpu(local_rx_pd->rx_pkt_length);87 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off;88 89 if (sizeof(rx_pkt_hdr->eth803_hdr) + sizeof(rfc1042_header) +90 rx_pkt_off > skb->len) {91 mwifiex_dbg(priv->adapter, ERROR,92 "wrong rx packet offset: len=%d, rx_pkt_off=%d\n",93 skb->len, rx_pkt_off);94 priv->stats.rx_dropped++;95 dev_kfree_skb_any(skb);96 return -1;97 }98 99 if (sizeof(*rx_pkt_hdr) + rx_pkt_off <= skb->len &&100 ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,101 sizeof(bridge_tunnel_header))) ||102 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,103 sizeof(rfc1042_header)) &&104 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&105 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX))) {106 /*107 * Replace the 803 header and rfc1042 header (llc/snap) with an108 * EthernetII header, keep the src/dst and snap_type109 * (ethertype).110 * The firmware only passes up SNAP frames converting111 * all RX Data from 802.11 to 802.2/LLC/SNAP frames.112 * To create the Ethernet II, just move the src, dst address113 * right before the snap_type.114 */115 eth = (struct ethhdr *)116 ((u8 *) &rx_pkt_hdr->eth803_hdr117 + sizeof(rx_pkt_hdr->eth803_hdr) +118 sizeof(rx_pkt_hdr->rfc1042_hdr)119 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)120 - sizeof(rx_pkt_hdr->eth803_hdr.h_source)121 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));122 123 memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source,124 sizeof(eth->h_source));125 memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,126 sizeof(eth->h_dest));127 128 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap129 header that was removed. */130 hdr_chop = (u8 *) eth - (u8 *) local_rx_pd;131 } else {132 /* Chop off the rxpd */133 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -134 (u8 *) local_rx_pd;135 }136 137 /* Chop off the leading header bytes so the it points to the start of138 either the reconstructed EthII frame or the 802.2/llc/snap frame */139 skb_pull(skb, hdr_chop);140 141 if (priv->hs2_enabled &&142 mwifiex_discard_gratuitous_arp(priv, skb)) {143 mwifiex_dbg(priv->adapter, INFO, "Bypassed Gratuitous ARP\n");144 dev_kfree_skb_any(skb);145 return 0;146 }147 148 if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&149 ntohs(rx_pkt_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) {150 offset = (u8 *)local_rx_pd + rx_pkt_off;151 mwifiex_process_tdls_action_frame(priv, offset, rx_pkt_len);152 }153 154 /* Only stash RX bitrate for unicast packets. */155 if (likely(!is_multicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest))) {156 priv->rxpd_rate = local_rx_pd->rx_rate;157 priv->rxpd_htinfo = local_rx_pd->ht_info;158 }159 160 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA ||161 GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) {162 adj_rx_rate = mwifiex_adjust_data_rate(priv,163 local_rx_pd->rx_rate,164 local_rx_pd->ht_info);165 mwifiex_hist_data_add(priv, adj_rx_rate, local_rx_pd->snr,166 local_rx_pd->nf);167 }168 169 ret = mwifiex_recv_packet(priv, skb);170 if (ret == -1)171 mwifiex_dbg(priv->adapter, ERROR,172 "recv packet failed\n");173 174 return ret;175}176 177/*178 * This function processes the received buffer.179 *180 * The function looks into the RxPD and performs sanity tests on the181 * received buffer to ensure its a valid packet, before processing it182 * further. If the packet is determined to be aggregated, it is183 * de-aggregated accordingly. Non-unicast packets are sent directly to184 * the kernel/upper layers. Unicast packets are handed over to the185 * Rx reordering routine if 11n is enabled.186 *187 * The completion callback is called after processing in complete.188 */189int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,190 struct sk_buff *skb)191{192 struct mwifiex_adapter *adapter = priv->adapter;193 int ret = 0;194 struct rxpd *local_rx_pd;195 struct rx_packet_hdr *rx_pkt_hdr;196 u8 ta[ETH_ALEN];197 u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;198 struct mwifiex_sta_node *sta_ptr;199 200 local_rx_pd = (struct rxpd *) (skb->data);201 rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);202 rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);203 rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);204 seq_num = le16_to_cpu(local_rx_pd->seq_num);205 206 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;207 208 if ((rx_pkt_offset + rx_pkt_length) > skb->len ||209 sizeof(rx_pkt_hdr->eth803_hdr) + rx_pkt_offset > skb->len) {210 mwifiex_dbg(adapter, ERROR,211 "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",212 skb->len, rx_pkt_offset, rx_pkt_length);213 priv->stats.rx_dropped++;214 dev_kfree_skb_any(skb);215 return ret;216 }217 218 if (rx_pkt_type == PKT_TYPE_MGMT) {219 ret = mwifiex_process_mgmt_packet(priv, skb);220 if (ret)221 mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed");222 dev_kfree_skb_any(skb);223 return ret;224 }225 226 /*227 * If the packet is not an unicast packet then send the packet228 * directly to os. Don't pass thru rx reordering229 */230 if ((!IS_11N_ENABLED(priv) &&231 !(ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&232 !(local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET))) ||233 !ether_addr_equal_unaligned(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest)) {234 mwifiex_process_rx_packet(priv, skb);235 return ret;236 }237 238 if (mwifiex_queuing_ra_based(priv) ||239 (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&240 local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET)) {241 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);242 if (local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET &&243 local_rx_pd->priority < MAX_NUM_TID) {244 sta_ptr = mwifiex_get_sta_entry(priv, ta);245 if (sta_ptr)246 sta_ptr->rx_seq[local_rx_pd->priority] =247 le16_to_cpu(local_rx_pd->seq_num);248 mwifiex_auto_tdls_update_peer_signal(priv, ta,249 local_rx_pd->snr,250 local_rx_pd->nf);251 }252 } else {253 if (rx_pkt_type != PKT_TYPE_BAR &&254 local_rx_pd->priority < MAX_NUM_TID)255 priv->rx_seq[local_rx_pd->priority] = seq_num;256 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,257 ETH_ALEN);258 }259 260 /* Reorder and send to OS */261 ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,262 ta, (u8) rx_pkt_type, skb);263 264 if (ret || (rx_pkt_type == PKT_TYPE_BAR))265 dev_kfree_skb_any(skb);266 267 if (ret)268 priv->stats.rx_dropped++;269 270 return ret;271}272