]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blame - drivers/net/wireless/mwifiex/sta_rx.c
mwifiex: fix an issue with Appletalk devices
[mirror_ubuntu-jammy-kernel.git] / drivers / net / wireless / mwifiex / sta_rx.c
CommitLineData
5e6e3a92
BZ
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
587b36d3
AP
20#include <uapi/linux/ipv6.h>
21#include <net/ndisc.h>
5e6e3a92
BZ
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
587b36d3
AP
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_hdr;
40 struct ipv6hdr *ipv6;
41 struct icmp6hdr *icmpv6;
42
43 eth_hdr = (struct ethhdr *)skb->data;
44 switch (ntohs(eth_hdr->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
5e6e3a92
BZ
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 */
f3b369e4 83int mwifiex_process_rx_packet(struct mwifiex_private *priv,
5e6e3a92
BZ
84 struct sk_buff *skb)
85{
270e58e8 86 int ret;
5e6e3a92
BZ
87 struct rx_packet_hdr *rx_pkt_hdr;
88 struct rxpd *local_rx_pd;
89 int hdr_chop;
90 struct ethhdr *eth_hdr;
5e6e3a92
BZ
91
92 local_rx_pd = (struct rxpd *) (skb->data);
93
ed1ea6f4
AK
94 rx_pkt_hdr = (void *)local_rx_pd +
95 le16_to_cpu(local_rx_pd->rx_pkt_offset);
5e6e3a92 96
c613d16f
AK
97 if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
98 sizeof(bridge_tunnel_header))) ||
99 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
100 sizeof(rfc1042_header)) &&
101 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
102 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
5e6e3a92
BZ
103 /*
104 * Replace the 803 header and rfc1042 header (llc/snap) with an
105 * EthernetII header, keep the src/dst and snap_type
106 * (ethertype).
107 * The firmware only passes up SNAP frames converting
108 * all RX Data from 802.11 to 802.2/LLC/SNAP frames.
109 * To create the Ethernet II, just move the src, dst address
110 * right before the snap_type.
111 */
112 eth_hdr = (struct ethhdr *)
113 ((u8 *) &rx_pkt_hdr->eth803_hdr
114 + sizeof(rx_pkt_hdr->eth803_hdr) +
115 sizeof(rx_pkt_hdr->rfc1042_hdr)
116 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
117 - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
118 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
119
120 memcpy(eth_hdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
121 sizeof(eth_hdr->h_source));
122 memcpy(eth_hdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
123 sizeof(eth_hdr->h_dest));
124
125 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap
126 header that was removed. */
127 hdr_chop = (u8 *) eth_hdr - (u8 *) local_rx_pd;
128 } else {
129 /* Chop off the rxpd */
130 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
131 (u8 *) local_rx_pd;
132 }
133
134 /* Chop off the leading header bytes so the it points to the start of
135 either the reconstructed EthII frame or the 802.2/llc/snap frame */
136 skb_pull(skb, hdr_chop);
137
587b36d3
AP
138 if (priv->hs2_enabled &&
139 mwifiex_discard_gratuitous_arp(priv, skb)) {
140 dev_dbg(priv->adapter->dev, "Bypassed Gratuitous ARP\n");
141 dev_kfree_skb_any(skb);
142 return 0;
143 }
144
5e6e3a92
BZ
145 priv->rxpd_rate = local_rx_pd->rx_rate;
146
147 priv->rxpd_htinfo = local_rx_pd->ht_info;
148
f3b369e4 149 ret = mwifiex_recv_packet(priv, skb);
5e6e3a92 150 if (ret == -1)
f3b369e4 151 dev_err(priv->adapter->dev, "recv packet failed\n");
5e6e3a92
BZ
152
153 return ret;
154}
155
156/*
157 * This function processes the received buffer.
158 *
159 * The function looks into the RxPD and performs sanity tests on the
160 * received buffer to ensure its a valid packet, before processing it
161 * further. If the packet is determined to be aggregated, it is
162 * de-aggregated accordingly. Non-unicast packets are sent directly to
163 * the kernel/upper layers. Unicast packets are handed over to the
164 * Rx reordering routine if 11n is enabled.
165 *
166 * The completion callback is called after processing in complete.
167 */
f3b369e4 168int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,
5e6e3a92
BZ
169 struct sk_buff *skb)
170{
f3b369e4 171 struct mwifiex_adapter *adapter = priv->adapter;
5e6e3a92
BZ
172 int ret = 0;
173 struct rxpd *local_rx_pd;
5e6e3a92
BZ
174 struct rx_packet_hdr *rx_pkt_hdr;
175 u8 ta[ETH_ALEN];
ed1ea6f4 176 u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
8ed13033 177
5e6e3a92 178 local_rx_pd = (struct rxpd *) (skb->data);
ed1ea6f4
AK
179 rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
180 rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
181 rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
182 seq_num = le16_to_cpu(local_rx_pd->seq_num);
5e6e3a92 183
ed1ea6f4 184 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
5e6e3a92 185
ed1ea6f4
AK
186 if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) {
187 dev_err(adapter->dev,
188 "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
189 skb->len, rx_pkt_offset, rx_pkt_length);
5e6e3a92 190 priv->stats.rx_dropped++;
4daffe35
AK
191
192 if (adapter->if_ops.data_complete)
193 adapter->if_ops.data_complete(adapter, skb);
194 else
195 dev_kfree_skb_any(skb);
196
5e6e3a92
BZ
197 return ret;
198 }
3b8ab88a 199
ed1ea6f4 200 if (rx_pkt_type == PKT_TYPE_AMSDU) {
3b8ab88a
YAP
201 struct sk_buff_head list;
202 struct sk_buff *rx_skb;
203
204 __skb_queue_head_init(&list);
205
ed1ea6f4
AK
206 skb_pull(skb, rx_pkt_offset);
207 skb_trim(skb, rx_pkt_length);
3b8ab88a
YAP
208
209 ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
c65a30f3 210 priv->wdev->iftype, 0, false);
3b8ab88a
YAP
211
212 while (!skb_queue_empty(&list)) {
213 rx_skb = __skb_dequeue(&list);
f3b369e4 214 ret = mwifiex_recv_packet(priv, rx_skb);
3b8ab88a
YAP
215 if (ret == -1)
216 dev_err(adapter->dev, "Rx of A-MSDU failed");
217 }
218 return 0;
2dbaf751 219 } else if (rx_pkt_type == PKT_TYPE_MGMT) {
f3b369e4 220 ret = mwifiex_process_mgmt_packet(priv, skb);
2dbaf751
SP
221 if (ret)
222 dev_err(adapter->dev, "Rx of mgmt packet failed");
223 dev_kfree_skb_any(skb);
224 return ret;
5e6e3a92 225 }
3b8ab88a 226
5e6e3a92
BZ
227 /*
228 * If the packet is not an unicast packet then send the packet
229 * directly to os. Don't pass thru rx reordering
230 */
231 if (!IS_11N_ENABLED(priv) ||
232 memcmp(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN)) {
f3b369e4 233 mwifiex_process_rx_packet(priv, skb);
5e6e3a92
BZ
234 return ret;
235 }
236
237 if (mwifiex_queuing_ra_based(priv)) {
238 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
239 } else {
240 if (rx_pkt_type != PKT_TYPE_BAR)
ed1ea6f4 241 priv->rx_seq[local_rx_pd->priority] = seq_num;
5e6e3a92
BZ
242 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
243 ETH_ALEN);
244 }
245
246 /* Reorder and send to OS */
ed1ea6f4
AK
247 ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
248 ta, (u8) rx_pkt_type, skb);
5e6e3a92 249
4daffe35
AK
250 if (ret || (rx_pkt_type == PKT_TYPE_BAR)) {
251 if (adapter->if_ops.data_complete)
252 adapter->if_ops.data_complete(adapter, skb);
253 else
254 dev_kfree_skb_any(skb);
255 }
8ed13033
YAP
256
257 if (ret)
258 priv->stats.rx_dropped++;
5e6e3a92
BZ
259
260 return ret;
261}