1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * NXP Wireless LAN device driver: station RX data handling 4 * 5 * Copyright 2011-2020 NXP 6 */ 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 advertisement 19 * frame. If frame has both source and destination mac address as same, this 20 * function drops such gratuitous frames. 21 */ 22 static bool 23 mwifiex_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 it 60 * to kernel/upper layer. 61 * 62 * This function parses through the received packet and determines 63 * if it is a debug packet or normal packet. 64 * 65 * For non-debug packets, the function chops off unnecessary leading 66 * header bytes, reconstructs the packet as an ethernet frame or 67 * 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 */ 71 int 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 ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header, 90 sizeof(bridge_tunnel_header))) || 91 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header, 92 sizeof(rfc1042_header)) && 93 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP && 94 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) { 95 /* 96 * Replace the 803 header and rfc1042 header (llc/snap) with an 97 * EthernetII header, keep the src/dst and snap_type 98 * (ethertype). 99 * The firmware only passes up SNAP frames converting 100 * all RX Data from 802.11 to 802.2/LLC/SNAP frames. 101 * To create the Ethernet II, just move the src, dst address 102 * right before the snap_type. 103 */ 104 eth = (struct ethhdr *) 105 ((u8 *) &rx_pkt_hdr->eth803_hdr 106 + sizeof(rx_pkt_hdr->eth803_hdr) + 107 sizeof(rx_pkt_hdr->rfc1042_hdr) 108 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest) 109 - sizeof(rx_pkt_hdr->eth803_hdr.h_source) 110 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type)); 111 112 memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source, 113 sizeof(eth->h_source)); 114 memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest, 115 sizeof(eth->h_dest)); 116 117 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap 118 header that was removed. */ 119 hdr_chop = (u8 *) eth - (u8 *) local_rx_pd; 120 } else { 121 /* Chop off the rxpd */ 122 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr - 123 (u8 *) local_rx_pd; 124 } 125 126 /* Chop off the leading header bytes so the it points to the start of 127 either the reconstructed EthII frame or the 802.2/llc/snap frame */ 128 skb_pull(skb, hdr_chop); 129 130 if (priv->hs2_enabled && 131 mwifiex_discard_gratuitous_arp(priv, skb)) { 132 mwifiex_dbg(priv->adapter, INFO, "Bypassed Gratuitous ARP\n"); 133 dev_kfree_skb_any(skb); 134 return 0; 135 } 136 137 if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) && 138 ntohs(rx_pkt_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) { 139 offset = (u8 *)local_rx_pd + rx_pkt_off; 140 mwifiex_process_tdls_action_frame(priv, offset, rx_pkt_len); 141 } 142 143 /* Only stash RX bitrate for unicast packets. */ 144 if (likely(!is_multicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest))) { 145 priv->rxpd_rate = local_rx_pd->rx_rate; 146 priv->rxpd_htinfo = local_rx_pd->ht_info; 147 } 148 149 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA || 150 GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) { 151 adj_rx_rate = mwifiex_adjust_data_rate(priv, 152 local_rx_pd->rx_rate, 153 local_rx_pd->ht_info); 154 mwifiex_hist_data_add(priv, adj_rx_rate, local_rx_pd->snr, 155 local_rx_pd->nf); 156 } 157 158 ret = mwifiex_recv_packet(priv, skb); 159 if (ret == -1) 160 mwifiex_dbg(priv->adapter, ERROR, 161 "recv packet failed\n"); 162 163 return ret; 164 } 165 166 /* 167 * This function processes the received buffer. 168 * 169 * The function looks into the RxPD and performs sanity tests on the 170 * received buffer to ensure its a valid packet, before processing it 171 * further. If the packet is determined to be aggregated, it is 172 * de-aggregated accordingly. Non-unicast packets are sent directly to 173 * the kernel/upper layers. Unicast packets are handed over to the 174 * Rx reordering routine if 11n is enabled. 175 * 176 * The completion callback is called after processing in complete. 177 */ 178 int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv, 179 struct sk_buff *skb) 180 { 181 struct mwifiex_adapter *adapter = priv->adapter; 182 int ret = 0; 183 struct rxpd *local_rx_pd; 184 struct rx_packet_hdr *rx_pkt_hdr; 185 u8 ta[ETH_ALEN]; 186 u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num; 187 struct mwifiex_sta_node *sta_ptr; 188 189 local_rx_pd = (struct rxpd *) (skb->data); 190 rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type); 191 rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset); 192 rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length); 193 seq_num = le16_to_cpu(local_rx_pd->seq_num); 194 195 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset; 196 197 if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) { 198 mwifiex_dbg(adapter, ERROR, 199 "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n", 200 skb->len, rx_pkt_offset, rx_pkt_length); 201 priv->stats.rx_dropped++; 202 dev_kfree_skb_any(skb); 203 return ret; 204 } 205 206 if (rx_pkt_type == PKT_TYPE_MGMT) { 207 ret = mwifiex_process_mgmt_packet(priv, skb); 208 if (ret) 209 mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed"); 210 dev_kfree_skb_any(skb); 211 return ret; 212 } 213 214 /* 215 * If the packet is not an unicast packet then send the packet 216 * directly to os. Don't pass thru rx reordering 217 */ 218 if ((!IS_11N_ENABLED(priv) && 219 !(ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) && 220 !(local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET))) || 221 !ether_addr_equal_unaligned(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest)) { 222 mwifiex_process_rx_packet(priv, skb); 223 return ret; 224 } 225 226 if (mwifiex_queuing_ra_based(priv) || 227 (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) && 228 local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET)) { 229 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN); 230 if (local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET && 231 local_rx_pd->priority < MAX_NUM_TID) { 232 sta_ptr = mwifiex_get_sta_entry(priv, ta); 233 if (sta_ptr) 234 sta_ptr->rx_seq[local_rx_pd->priority] = 235 le16_to_cpu(local_rx_pd->seq_num); 236 mwifiex_auto_tdls_update_peer_signal(priv, ta, 237 local_rx_pd->snr, 238 local_rx_pd->nf); 239 } 240 } else { 241 if (rx_pkt_type != PKT_TYPE_BAR && 242 local_rx_pd->priority < MAX_NUM_TID) 243 priv->rx_seq[local_rx_pd->priority] = seq_num; 244 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address, 245 ETH_ALEN); 246 } 247 248 /* Reorder and send to OS */ 249 ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority, 250 ta, (u8) rx_pkt_type, skb); 251 252 if (ret || (rx_pkt_type == PKT_TYPE_BAR)) 253 dev_kfree_skb_any(skb); 254 255 if (ret) 256 priv->stats.rx_dropped++; 257 258 return ret; 259 } 260