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->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 an 108 * EthernetII header, keep the src/dst and snap_type 109 * (ethertype). 110 * The firmware only passes up SNAP frames converting 111 * all RX Data from 802.11 to 802.2/LLC/SNAP frames. 112 * To create the Ethernet II, just move the src, dst address 113 * right before the snap_type. 114 */ 115 eth = (struct ethhdr *) 116 ((u8 *) &rx_pkt_hdr->eth803_hdr 117 + 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/snap 129 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 of 138 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 the 181 * received buffer to ensure its a valid packet, before processing it 182 * further. If the packet is determined to be aggregated, it is 183 * de-aggregated accordingly. Non-unicast packets are sent directly to 184 * the kernel/upper layers. Unicast packets are handed over to the 185 * Rx reordering routine if 11n is enabled. 186 * 187 * The completion callback is called after processing in complete. 188 */ 189 int 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 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