1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * NXP Wireless LAN device driver: station RX data handling 4 * 5 * Copyright 2011-2024 NXP 6 */ 7 8 #include <uapi/linux/ipv6.h> 9 #include <net/ndisc.h> 10 #include "cfg.h" 11 #include "util.h" 12 #include "fw.h" 13 #include "main.h" 14 #include "11n_aggr.h" 15 #include "11n_rxreorder.h" 16 17 /* 18 * Drop gratuitous IPv4 ARP and IPv6 neighbour advertisements when 19 * source and destination addresses are identical. 20 */ 21 static bool 22 nxpwifi_discard_gratuitous_arp(struct nxpwifi_private *priv, 23 struct sk_buff *skb) 24 { 25 const struct nxpwifi_arp_eth_header *arp; 26 struct ethhdr *eth; 27 struct ipv6hdr *ipv6; 28 struct icmp6hdr *icmpv6; 29 30 eth = (struct ethhdr *)skb->data; 31 switch (ntohs(eth->h_proto)) { 32 case ETH_P_ARP: 33 arp = (void *)(skb->data + sizeof(struct ethhdr)); 34 if (arp->hdr.ar_op == htons(ARPOP_REPLY) || 35 arp->hdr.ar_op == htons(ARPOP_REQUEST)) { 36 if (!memcmp(arp->ar_sip, arp->ar_tip, 4)) 37 return true; 38 } 39 break; 40 case ETH_P_IPV6: 41 ipv6 = (void *)(skb->data + sizeof(struct ethhdr)); 42 icmpv6 = (void *)(skb->data + sizeof(struct ethhdr) + 43 sizeof(struct ipv6hdr)); 44 if (icmpv6->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) { 45 if (!memcmp(&ipv6->saddr, &ipv6->daddr, 46 sizeof(struct in6_addr))) 47 return true; 48 } 49 break; 50 default: 51 break; 52 } 53 54 return false; 55 } 56 57 /* 58 * Process a received data packet. 59 * Convert 802.2/LLC/SNAP to Ethernet II when appropriate, trim the 60 * rxpd and extra headers, optionally drop gratuitous ARP/NA, cache 61 * RX rate for unicast, then deliver to the stack. 62 */ 63 int nxpwifi_process_rx_packet(struct nxpwifi_private *priv, 64 struct sk_buff *skb) 65 { 66 int ret; 67 struct rx_packet_hdr *rx_pkt_hdr; 68 struct rxpd *local_rx_pd; 69 int hdr_chop; 70 struct ethhdr *eth; 71 u16 rx_pkt_off; 72 u8 adj_rx_rate = 0; 73 74 local_rx_pd = (struct rxpd *)(skb->data); 75 76 rx_pkt_off = le16_to_cpu(local_rx_pd->rx_pkt_offset); 77 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off; 78 79 if (sizeof(rx_pkt_hdr->eth803_hdr) + sizeof(rfc1042_header) + 80 rx_pkt_off > skb->len) { 81 priv->stats.rx_dropped++; 82 dev_kfree_skb_any(skb); 83 return -EINVAL; 84 } 85 86 if (sizeof(*rx_pkt_hdr) + rx_pkt_off <= skb->len && 87 ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header, 88 sizeof(bridge_tunnel_header))) || 89 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header, 90 sizeof(rfc1042_header)) && 91 rx_pkt_hdr->rfc1042_hdr.snap_type != htons(ETH_P_AARP) && 92 rx_pkt_hdr->rfc1042_hdr.snap_type != htons(ETH_P_IPX)))) { 93 /* 94 * Replace the 803 header and rfc1042 header (llc/snap) with an 95 * EthernetII header, keep the src/dst and snap_type 96 * (ethertype). 97 * The firmware only passes up SNAP frames converting 98 * all RX Data from 802.11 to 802.2/LLC/SNAP frames. 99 * To create the Ethernet II, just move the src, dst address 100 * right before the snap_type. 101 */ 102 eth = (struct ethhdr *) 103 ((u8 *)&rx_pkt_hdr->eth803_hdr 104 + sizeof(rx_pkt_hdr->eth803_hdr) + 105 sizeof(rx_pkt_hdr->rfc1042_hdr) 106 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest) 107 - sizeof(rx_pkt_hdr->eth803_hdr.h_source) 108 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type)); 109 110 memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source, 111 sizeof(eth->h_source)); 112 memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest, 113 sizeof(eth->h_dest)); 114 115 /* 116 * Chop off the rxpd + the excess memory from the 802.2/llc/snap 117 * header that was removed. 118 */ 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 - (u8 *)local_rx_pd; 123 } 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 */ 129 skb_pull(skb, hdr_chop); 130 131 if (priv->hs2_enabled && 132 nxpwifi_discard_gratuitous_arp(priv, skb)) { 133 nxpwifi_dbg(priv->adapter, INFO, "Bypassed Gratuitous ARP\n"); 134 dev_kfree_skb_any(skb); 135 return 0; 136 } 137 138 /* Only stash RX bitrate for unicast packets. */ 139 if (likely(!is_multicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest))) { 140 priv->rxpd_rate = local_rx_pd->rx_rate; 141 priv->rxpd_htinfo = local_rx_pd->rate_info; 142 } 143 144 if (GET_BSS_ROLE(priv) == NXPWIFI_BSS_ROLE_STA || 145 GET_BSS_ROLE(priv) == NXPWIFI_BSS_ROLE_UAP) { 146 adj_rx_rate = nxpwifi_adjust_data_rate(priv, 147 local_rx_pd->rx_rate, 148 local_rx_pd->rate_info); 149 nxpwifi_hist_data_add(priv, adj_rx_rate, local_rx_pd->snr, 150 local_rx_pd->nf); 151 } 152 153 ret = nxpwifi_recv_packet(priv, skb); 154 if (ret) 155 nxpwifi_dbg(priv->adapter, ERROR, 156 "recv packet failed\n"); 157 158 return ret; 159 } 160 161 /* 162 * Process a received buffer on the STA path. 163 * Validate RxPD and lengths, handle monitor/mgmt frames, fast-path 164 * non-unicast frames, and feed unicast data into 11n reorder/BA logic. 165 */ 166 int nxpwifi_process_sta_rx_packet(struct nxpwifi_private *priv, 167 struct sk_buff *skb) 168 { 169 struct nxpwifi_adapter *adapter = priv->adapter; 170 int ret = 0; 171 struct rxpd *local_rx_pd; 172 struct rx_packet_hdr *rx_pkt_hdr; 173 u8 ta[ETH_ALEN]; 174 u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num; 175 176 local_rx_pd = (struct rxpd *)(skb->data); 177 rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type); 178 rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset); 179 rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length); 180 seq_num = le16_to_cpu(local_rx_pd->seq_num); 181 182 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset; 183 184 if ((rx_pkt_offset + rx_pkt_length) > skb->len || 185 sizeof(rx_pkt_hdr->eth803_hdr) + rx_pkt_offset > skb->len) { 186 nxpwifi_dbg(adapter, ERROR, 187 "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n", 188 skb->len, rx_pkt_offset, rx_pkt_length); 189 priv->stats.rx_dropped++; 190 dev_kfree_skb_any(skb); 191 return ret; 192 } 193 194 if (priv->adapter->enable_net_mon && rx_pkt_type == PKT_TYPE_802DOT11) { 195 ret = nxpwifi_recv_packet_to_monif(priv, skb); 196 if (ret) 197 dev_kfree_skb_any(skb); 198 return ret; 199 } 200 201 if (rx_pkt_type == PKT_TYPE_MGMT) { 202 ret = nxpwifi_process_mgmt_packet(priv, skb); 203 if (ret && (ret != -EINPROGRESS)) 204 nxpwifi_dbg(adapter, DATA, "Rx of mgmt packet failed"); 205 if (ret != -EINPROGRESS) 206 dev_kfree_skb_any(skb); 207 return ret; 208 } 209 210 /* 211 * If the packet is not an unicast packet then send the packet 212 * directly to os. Don't pass thru rx reordering 213 */ 214 if (!IS_11N_ENABLED(priv) || 215 !ether_addr_equal_unaligned(priv->curr_addr, 216 rx_pkt_hdr->eth803_hdr.h_dest)) { 217 nxpwifi_process_rx_packet(priv, skb); 218 return ret; 219 } 220 221 if (nxpwifi_queuing_ra_based(priv)) { 222 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN); 223 } else { 224 if (rx_pkt_type != PKT_TYPE_BAR && 225 local_rx_pd->priority < MAX_NUM_TID) 226 priv->rx_seq[local_rx_pd->priority] = seq_num; 227 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address, 228 ETH_ALEN); 229 } 230 231 /* Reorder and send to OS */ 232 ret = nxpwifi_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority, 233 ta, (u8)rx_pkt_type, skb); 234 235 if (ret || rx_pkt_type == PKT_TYPE_BAR) 236 dev_kfree_skb_any(skb); 237 238 if (ret) 239 priv->stats.rx_dropped++; 240 241 return ret; 242 } 243