1 /* 2 * NXP Wireless LAN device driver: station RX data handling 3 * 4 * Copyright 2011-2020 NXP 5 * 6 * This software file (the "File") is distributed by NXP 7 * under the terms of the GNU General Public License Version 2, June 1991 8 * (the "License"). You may use, redistribute and/or modify this File in 9 * accordance with the terms and conditions of the License, a copy of which 10 * is available by writing to the Free Software Foundation, Inc., 11 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the 12 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt. 13 * 14 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE 16 * ARE EXPRESSLY DISCLAIMED. The License provides additional details about 17 * this warranty disclaimer. 18 */ 19 20 #include <uapi/linux/ipv6.h> 21 #include <net/ndisc.h> 22 #include "decl.h" 23 #include "ioctl.h" 24 #include "util.h" 25 #include "fw.h" 26 #include "main.h" 27 #include "11n_aggr.h" 28 #include "11n_rxreorder.h" 29 30 /* This function checks if a frame is IPv4 ARP or IPv6 Neighbour advertisement 31 * frame. If frame has both source and destination mac address as same, this 32 * function drops such gratuitous frames. 33 */ 34 static bool 35 mwifiex_discard_gratuitous_arp(struct mwifiex_private *priv, 36 struct sk_buff *skb) 37 { 38 const struct mwifiex_arp_eth_header *arp; 39 struct ethhdr *eth; 40 struct ipv6hdr *ipv6; 41 struct icmp6hdr *icmpv6; 42 43 eth = (struct ethhdr *)skb->data; 44 switch (ntohs(eth->h_proto)) { 45 case ETH_P_ARP: 46 arp = (void *)(skb->data + sizeof(struct ethhdr)); 47 if (arp->hdr.ar_op == htons(ARPOP_REPLY) || 48 arp->hdr.ar_op == htons(ARPOP_REQUEST)) { 49 if (!memcmp(arp->ar_sip, arp->ar_tip, 4)) 50 return true; 51 } 52 break; 53 case ETH_P_IPV6: 54 ipv6 = (void *)(skb->data + sizeof(struct ethhdr)); 55 icmpv6 = (void *)(skb->data + sizeof(struct ethhdr) + 56 sizeof(struct ipv6hdr)); 57 if (NDISC_NEIGHBOUR_ADVERTISEMENT == icmpv6->icmp6_type) { 58 if (!memcmp(&ipv6->saddr, &ipv6->daddr, 59 sizeof(struct in6_addr))) 60 return true; 61 } 62 break; 63 default: 64 break; 65 } 66 67 return false; 68 } 69 70 /* 71 * This function processes the received packet and forwards it 72 * to kernel/upper layer. 73 * 74 * This function parses through the received packet and determines 75 * if it is a debug packet or normal packet. 76 * 77 * For non-debug packets, the function chops off unnecessary leading 78 * header bytes, reconstructs the packet as an ethernet frame or 79 * 802.2/llc/snap frame as required, and sends it to kernel/upper layer. 80 * 81 * The completion callback is called after processing in complete. 82 */ 83 int mwifiex_process_rx_packet(struct mwifiex_private *priv, 84 struct sk_buff *skb) 85 { 86 int ret; 87 struct rx_packet_hdr *rx_pkt_hdr; 88 struct rxpd *local_rx_pd; 89 int hdr_chop; 90 struct ethhdr *eth; 91 u16 rx_pkt_off, rx_pkt_len; 92 u8 *offset; 93 u8 adj_rx_rate = 0; 94 95 local_rx_pd = (struct rxpd *) (skb->data); 96 97 rx_pkt_off = le16_to_cpu(local_rx_pd->rx_pkt_offset); 98 rx_pkt_len = le16_to_cpu(local_rx_pd->rx_pkt_length); 99 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off; 100 101 if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header, 102 sizeof(bridge_tunnel_header))) || 103 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header, 104 sizeof(rfc1042_header)) && 105 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP && 106 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) { 107 /* 108 * Replace the 803 header and rfc1042 header (llc/snap) with an 109 * EthernetII header, keep the src/dst and snap_type 110 * (ethertype). 111 * The firmware only passes up SNAP frames converting 112 * all RX Data from 802.11 to 802.2/LLC/SNAP frames. 113 * To create the Ethernet II, just move the src, dst address 114 * right before the snap_type. 115 */ 116 eth = (struct ethhdr *) 117 ((u8 *) &rx_pkt_hdr->eth803_hdr 118 + sizeof(rx_pkt_hdr->eth803_hdr) + 119 sizeof(rx_pkt_hdr->rfc1042_hdr) 120 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest) 121 - sizeof(rx_pkt_hdr->eth803_hdr.h_source) 122 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type)); 123 124 memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source, 125 sizeof(eth->h_source)); 126 memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest, 127 sizeof(eth->h_dest)); 128 129 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap 130 header that was removed. */ 131 hdr_chop = (u8 *) eth - (u8 *) local_rx_pd; 132 } else { 133 /* Chop off the rxpd */ 134 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr - 135 (u8 *) local_rx_pd; 136 } 137 138 /* Chop off the leading header bytes so the it points to the start of 139 either the reconstructed EthII frame or the 802.2/llc/snap frame */ 140 skb_pull(skb, hdr_chop); 141 142 if (priv->hs2_enabled && 143 mwifiex_discard_gratuitous_arp(priv, skb)) { 144 mwifiex_dbg(priv->adapter, INFO, "Bypassed Gratuitous ARP\n"); 145 dev_kfree_skb_any(skb); 146 return 0; 147 } 148 149 if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) && 150 ntohs(rx_pkt_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) { 151 offset = (u8 *)local_rx_pd + rx_pkt_off; 152 mwifiex_process_tdls_action_frame(priv, offset, rx_pkt_len); 153 } 154 155 /* Only stash RX bitrate for unicast packets. */ 156 if (likely(!is_multicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest))) { 157 priv->rxpd_rate = local_rx_pd->rx_rate; 158 priv->rxpd_htinfo = local_rx_pd->ht_info; 159 } 160 161 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA || 162 GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) { 163 adj_rx_rate = mwifiex_adjust_data_rate(priv, 164 local_rx_pd->rx_rate, 165 local_rx_pd->ht_info); 166 mwifiex_hist_data_add(priv, adj_rx_rate, local_rx_pd->snr, 167 local_rx_pd->nf); 168 } 169 170 ret = mwifiex_recv_packet(priv, skb); 171 if (ret == -1) 172 mwifiex_dbg(priv->adapter, ERROR, 173 "recv packet failed\n"); 174 175 return ret; 176 } 177 178 /* 179 * This function processes the received buffer. 180 * 181 * The function looks into the RxPD and performs sanity tests on the 182 * received buffer to ensure its a valid packet, before processing it 183 * further. If the packet is determined to be aggregated, it is 184 * de-aggregated accordingly. Non-unicast packets are sent directly to 185 * the kernel/upper layers. Unicast packets are handed over to the 186 * Rx reordering routine if 11n is enabled. 187 * 188 * The completion callback is called after processing in complete. 189 */ 190 int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv, 191 struct sk_buff *skb) 192 { 193 struct mwifiex_adapter *adapter = priv->adapter; 194 int ret = 0; 195 struct rxpd *local_rx_pd; 196 struct rx_packet_hdr *rx_pkt_hdr; 197 u8 ta[ETH_ALEN]; 198 u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num; 199 struct mwifiex_sta_node *sta_ptr; 200 201 local_rx_pd = (struct rxpd *) (skb->data); 202 rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type); 203 rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset); 204 rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length); 205 seq_num = le16_to_cpu(local_rx_pd->seq_num); 206 207 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset; 208 209 if ((rx_pkt_offset + rx_pkt_length) > (u16) 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 packet 228 * directly to os. Don't pass thru rx reordering 229 */ 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