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 */
34 static bool
mwifiex_discard_gratuitous_arp(struct mwifiex_private * priv,struct sk_buff * skb)35 mwifiex_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 */
mwifiex_process_rx_packet(struct mwifiex_private * priv,struct sk_buff * skb)83 int 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 u8 adj_rx_rate = 0;
94
95 local_rx_pd = (struct rxpd *) (skb->data);
96
97 rx_pkt_off = le16_to_cpu(local_rx_pd->rx_pkt_offset);
98 rx_pkt_len = le16_to_cpu(local_rx_pd->rx_pkt_length);
99 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off;
100
101 if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
102 sizeof(bridge_tunnel_header))) ||
103 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
104 sizeof(rfc1042_header)) &&
105 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
106 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
107 /*
108 * Replace the 803 header and rfc1042 header (llc/snap) with an
109 * EthernetII header, keep the src/dst and snap_type
110 * (ethertype).
111 * The firmware only passes up SNAP frames converting
112 * all RX Data from 802.11 to 802.2/LLC/SNAP frames.
113 * To create the Ethernet II, just move the src, dst address
114 * right before the snap_type.
115 */
116 eth = (struct ethhdr *)
117 ((u8 *) &rx_pkt_hdr->eth803_hdr
118 + sizeof(rx_pkt_hdr->eth803_hdr) +
119 sizeof(rx_pkt_hdr->rfc1042_hdr)
120 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
121 - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
122 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
123
124 memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source,
125 sizeof(eth->h_source));
126 memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
127 sizeof(eth->h_dest));
128
129 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap
130 header that was removed. */
131 hdr_chop = (u8 *) eth - (u8 *) local_rx_pd;
132 } else {
133 /* Chop off the rxpd */
134 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
135 (u8 *) local_rx_pd;
136 }
137
138 /* Chop off the leading header bytes so the it points to the start of
139 either the reconstructed EthII frame or the 802.2/llc/snap frame */
140 skb_pull(skb, hdr_chop);
141
142 if (priv->hs2_enabled &&
143 mwifiex_discard_gratuitous_arp(priv, skb)) {
144 mwifiex_dbg(priv->adapter, INFO, "Bypassed Gratuitous ARP\n");
145 dev_kfree_skb_any(skb);
146 return 0;
147 }
148
149 if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
150 ntohs(rx_pkt_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) {
151 offset = (u8 *)local_rx_pd + rx_pkt_off;
152 mwifiex_process_tdls_action_frame(priv, offset, rx_pkt_len);
153 }
154
155 priv->rxpd_rate = local_rx_pd->rx_rate;
156
157 priv->rxpd_htinfo = local_rx_pd->ht_info;
158
159 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA ||
160 GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) {
161 adj_rx_rate = mwifiex_adjust_data_rate(priv, priv->rxpd_rate,
162 priv->rxpd_htinfo);
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 */
mwifiex_process_sta_rx_packet(struct mwifiex_private * priv,struct sk_buff * skb)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) > (u16) skb->len) {
207 mwifiex_dbg(adapter, ERROR,
208 "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
209 skb->len, rx_pkt_offset, rx_pkt_length);
210 priv->stats.rx_dropped++;
211 dev_kfree_skb_any(skb);
212 return ret;
213 }
214
215 if (rx_pkt_type == PKT_TYPE_MGMT) {
216 ret = mwifiex_process_mgmt_packet(priv, skb);
217 if (ret)
218 mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed");
219 dev_kfree_skb_any(skb);
220 return ret;
221 }
222
223 /*
224 * If the packet is not an unicast packet then send the packet
225 * directly to os. Don't pass thru rx reordering
226 */
227 if ((!IS_11N_ENABLED(priv) &&
228 !(ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
229 !(local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET))) ||
230 !ether_addr_equal_unaligned(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest)) {
231 mwifiex_process_rx_packet(priv, skb);
232 return ret;
233 }
234
235 if (mwifiex_queuing_ra_based(priv) ||
236 (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
237 local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET)) {
238 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
239 if (local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET &&
240 local_rx_pd->priority < MAX_NUM_TID) {
241 sta_ptr = mwifiex_get_sta_entry(priv, ta);
242 if (sta_ptr)
243 sta_ptr->rx_seq[local_rx_pd->priority] =
244 le16_to_cpu(local_rx_pd->seq_num);
245 mwifiex_auto_tdls_update_peer_signal(priv, ta,
246 local_rx_pd->snr,
247 local_rx_pd->nf);
248 }
249 } else {
250 if (rx_pkt_type != PKT_TYPE_BAR)
251 priv->rx_seq[local_rx_pd->priority] = seq_num;
252 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
253 ETH_ALEN);
254 }
255
256 /* Reorder and send to OS */
257 ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
258 ta, (u8) rx_pkt_type, skb);
259
260 if (ret || (rx_pkt_type == PKT_TYPE_BAR))
261 dev_kfree_skb_any(skb);
262
263 if (ret)
264 priv->stats.rx_dropped++;
265
266 return ret;
267 }
268
