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 (sizeof(*rx_pkt_hdr) + rx_pkt_off > skb->len) { 90 mwifiex_dbg(priv->adapter, ERROR, 91 "wrong rx packet offset: len=%d, rx_pkt_off=%d\n", 92 skb->len, rx_pkt_off); 93 priv->stats.rx_dropped++; 94 dev_kfree_skb_any(skb); 95 return -1; 96 } 97 98 if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header, 99 sizeof(bridge_tunnel_header))) || 100 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header, 101 sizeof(rfc1042_header)) && 102 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP && 103 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) { 104 /* 105 * Replace the 803 header and rfc1042 header (llc/snap) with an 106 * EthernetII header, keep the src/dst and snap_type 107 * (ethertype). 108 * The firmware only passes up SNAP frames converting 109 * all RX Data from 802.11 to 802.2/LLC/SNAP frames. 110 * To create the Ethernet II, just move the src, dst address 111 * right before the snap_type. 112 */ 113 eth = (struct ethhdr *) 114 ((u8 *) &rx_pkt_hdr->eth803_hdr 115 + sizeof(rx_pkt_hdr->eth803_hdr) + 116 sizeof(rx_pkt_hdr->rfc1042_hdr) 117 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest) 118 - sizeof(rx_pkt_hdr->eth803_hdr.h_source) 119 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type)); 120 121 memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source, 122 sizeof(eth->h_source)); 123 memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest, 124 sizeof(eth->h_dest)); 125 126 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap 127 header that was removed. */ 128 hdr_chop = (u8 *) eth - (u8 *) local_rx_pd; 129 } else { 130 /* Chop off the rxpd */ 131 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr - 132 (u8 *) local_rx_pd; 133 } 134 135 /* Chop off the leading header bytes so the it points to the start of 136 either the reconstructed EthII frame or the 802.2/llc/snap frame */ 137 skb_pull(skb, hdr_chop); 138 139 if (priv->hs2_enabled && 140 mwifiex_discard_gratuitous_arp(priv, skb)) { 141 mwifiex_dbg(priv->adapter, INFO, "Bypassed Gratuitous ARP\n"); 142 dev_kfree_skb_any(skb); 143 return 0; 144 } 145 146 if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) && 147 ntohs(rx_pkt_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) { 148 offset = (u8 *)local_rx_pd + rx_pkt_off; 149 mwifiex_process_tdls_action_frame(priv, offset, rx_pkt_len); 150 } 151 152 /* Only stash RX bitrate for unicast packets. */ 153 if (likely(!is_multicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest))) { 154 priv->rxpd_rate = local_rx_pd->rx_rate; 155 priv->rxpd_htinfo = local_rx_pd->ht_info; 156 } 157 158 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA || 159 GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) { 160 adj_rx_rate = mwifiex_adjust_data_rate(priv, 161 local_rx_pd->rx_rate, 162 local_rx_pd->ht_info); 163 mwifiex_hist_data_add(priv, adj_rx_rate, local_rx_pd->snr, 164 local_rx_pd->nf); 165 } 166 167 ret = mwifiex_recv_packet(priv, skb); 168 if (ret == -1) 169 mwifiex_dbg(priv->adapter, ERROR, 170 "recv packet failed\n"); 171 172 return ret; 173 } 174 175 /* 176 * This function processes the received buffer. 177 * 178 * The function looks into the RxPD and performs sanity tests on the 179 * received buffer to ensure its a valid packet, before processing it 180 * further. If the packet is determined to be aggregated, it is 181 * de-aggregated accordingly. Non-unicast packets are sent directly to 182 * the kernel/upper layers. Unicast packets are handed over to the 183 * Rx reordering routine if 11n is enabled. 184 * 185 * The completion callback is called after processing in complete. 186 */ 187 int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv, 188 struct sk_buff *skb) 189 { 190 struct mwifiex_adapter *adapter = priv->adapter; 191 int ret = 0; 192 struct rxpd *local_rx_pd; 193 struct rx_packet_hdr *rx_pkt_hdr; 194 u8 ta[ETH_ALEN]; 195 u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num; 196 struct mwifiex_sta_node *sta_ptr; 197 198 local_rx_pd = (struct rxpd *) (skb->data); 199 rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type); 200 rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset); 201 rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length); 202 seq_num = le16_to_cpu(local_rx_pd->seq_num); 203 204 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset; 205 206 if ((rx_pkt_offset + rx_pkt_length) > skb->len || 207 sizeof(rx_pkt_hdr->eth803_hdr) + rx_pkt_offset > skb->len) { 208 mwifiex_dbg(adapter, ERROR, 209 "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n", 210 skb->len, rx_pkt_offset, rx_pkt_length); 211 priv->stats.rx_dropped++; 212 dev_kfree_skb_any(skb); 213 return ret; 214 } 215 216 if (rx_pkt_type == PKT_TYPE_MGMT) { 217 ret = mwifiex_process_mgmt_packet(priv, skb); 218 if (ret) 219 mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed"); 220 dev_kfree_skb_any(skb); 221 return ret; 222 } 223 224 /* 225 * If the packet is not an unicast packet then send the packet 226 * directly to os. Don't pass thru rx reordering 227 */ 228 if ((!IS_11N_ENABLED(priv) && 229 !(ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) && 230 !(local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET))) || 231 !ether_addr_equal_unaligned(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest)) { 232 mwifiex_process_rx_packet(priv, skb); 233 return ret; 234 } 235 236 if (mwifiex_queuing_ra_based(priv) || 237 (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) && 238 local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET)) { 239 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN); 240 if (local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET && 241 local_rx_pd->priority < MAX_NUM_TID) { 242 sta_ptr = mwifiex_get_sta_entry(priv, ta); 243 if (sta_ptr) 244 sta_ptr->rx_seq[local_rx_pd->priority] = 245 le16_to_cpu(local_rx_pd->seq_num); 246 mwifiex_auto_tdls_update_peer_signal(priv, ta, 247 local_rx_pd->snr, 248 local_rx_pd->nf); 249 } 250 } else { 251 if (rx_pkt_type != PKT_TYPE_BAR && 252 local_rx_pd->priority < MAX_NUM_TID) 253 priv->rx_seq[local_rx_pd->priority] = seq_num; 254 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address, 255 ETH_ALEN); 256 } 257 258 /* Reorder and send to OS */ 259 ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority, 260 ta, (u8) rx_pkt_type, skb); 261 262 if (ret || (rx_pkt_type == PKT_TYPE_BAR)) 263 dev_kfree_skb_any(skb); 264 265 if (ret) 266 priv->stats.rx_dropped++; 267 268 return ret; 269 } 270