1/* 2 * Marvell Wireless LAN device driver: station RX data handling 3 * 4 * Copyright (C) 2011-2014, Marvell International Ltd. 5 * 6 * This software file (the "File") is distributed by Marvell International 7 * Ltd. 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 */ 34static bool 35mwifiex_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 */ 83int 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 94 local_rx_pd = (struct rxpd *) (skb->data); 95 96 rx_pkt_off = le16_to_cpu(local_rx_pd->rx_pkt_offset); 97 rx_pkt_len = le16_to_cpu(local_rx_pd->rx_pkt_length); 98 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off; 99 100 if ((!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 dev_dbg(priv->adapter->dev, "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 priv->rxpd_rate = local_rx_pd->rx_rate; 155 156 priv->rxpd_htinfo = local_rx_pd->ht_info; 157 158 ret = mwifiex_recv_packet(priv, skb); 159 if (ret == -1) 160 dev_err(priv->adapter->dev, "recv packet failed\n"); 161 162 return ret; 163} 164 165/* 166 * This function processes the received buffer. 167 * 168 * The function looks into the RxPD and performs sanity tests on the 169 * received buffer to ensure its a valid packet, before processing it 170 * further. If the packet is determined to be aggregated, it is 171 * de-aggregated accordingly. Non-unicast packets are sent directly to 172 * the kernel/upper layers. Unicast packets are handed over to the 173 * Rx reordering routine if 11n is enabled. 174 * 175 * The completion callback is called after processing in complete. 176 */ 177int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv, 178 struct sk_buff *skb) 179{ 180 struct mwifiex_adapter *adapter = priv->adapter; 181 int ret = 0; 182 struct rxpd *local_rx_pd; 183 struct rx_packet_hdr *rx_pkt_hdr; 184 u8 ta[ETH_ALEN]; 185 u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num; 186 struct mwifiex_sta_node *sta_ptr; 187 188 local_rx_pd = (struct rxpd *) (skb->data); 189 rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type); 190 rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset); 191 rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length); 192 seq_num = le16_to_cpu(local_rx_pd->seq_num); 193 194 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset; 195 196 if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) { 197 dev_err(adapter->dev, 198 "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n", 199 skb->len, rx_pkt_offset, rx_pkt_length); 200 priv->stats.rx_dropped++; 201 dev_kfree_skb_any(skb); 202 return ret; 203 } 204 205 if (rx_pkt_type == PKT_TYPE_MGMT) { 206 ret = mwifiex_process_mgmt_packet(priv, skb); 207 if (ret) 208 dev_err(adapter->dev, "Rx of mgmt packet failed"); 209 dev_kfree_skb_any(skb); 210 return ret; 211 } 212 213 /* 214 * If the packet is not an unicast packet then send the packet 215 * directly to os. Don't pass thru rx reordering 216 */ 217 if ((!IS_11N_ENABLED(priv) && 218 !(ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) && 219 !(local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET))) || 220 !ether_addr_equal_unaligned(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest)) { 221 mwifiex_process_rx_packet(priv, skb); 222 return ret; 223 } 224 225 if (mwifiex_queuing_ra_based(priv) || 226 (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) && 227 local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET)) { 228 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN); 229 if (local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET && 230 local_rx_pd->priority < MAX_NUM_TID) { 231 sta_ptr = mwifiex_get_sta_entry(priv, ta); 232 if (sta_ptr) 233 sta_ptr->rx_seq[local_rx_pd->priority] = 234 le16_to_cpu(local_rx_pd->seq_num); 235 } 236 } else { 237 if (rx_pkt_type != PKT_TYPE_BAR) 238 priv->rx_seq[local_rx_pd->priority] = seq_num; 239 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address, 240 ETH_ALEN); 241 } 242 243 /* Reorder and send to OS */ 244 ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority, 245 ta, (u8) rx_pkt_type, skb); 246 247 if (ret || (rx_pkt_type == PKT_TYPE_BAR)) 248 dev_kfree_skb_any(skb); 249 250 if (ret) 251 priv->stats.rx_dropped++; 252 253 return ret; 254} 255