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1/*
2 * Marvell Wireless LAN device driver: station RX data handling
3 *
4 * Copyright (C) 2011, 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
187 local_rx_pd = (struct rxpd *) (skb->data);
188 rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
189 rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
190 rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
191 seq_num = le16_to_cpu(local_rx_pd->seq_num);
192
193 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
194
195 if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) {
196 dev_err(adapter->dev,
197 "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
198 skb->len, rx_pkt_offset, rx_pkt_length);
199 priv->stats.rx_dropped++;
200 dev_kfree_skb_any(skb);
201 return ret;
202 }
203
204 if (rx_pkt_type == PKT_TYPE_MGMT) {
205 ret = mwifiex_process_mgmt_packet(priv, skb);
206 if (ret)
207 dev_err(adapter->dev, "Rx of mgmt packet failed");
208 dev_kfree_skb_any(skb);
209 return ret;
210 }
211
212 /*
213 * If the packet is not an unicast packet then send the packet
214 * directly to os. Don't pass thru rx reordering
215 */
216 if (!IS_11N_ENABLED(priv) ||
217 !ether_addr_equal_unaligned(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest)) {
218 mwifiex_process_rx_packet(priv, skb);
219 return ret;
220 }
221
222 if (mwifiex_queuing_ra_based(priv)) {
223 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
224 } else {
225 if (rx_pkt_type != PKT_TYPE_BAR)
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 = mwifiex_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}