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1/*
2 * This file contains the handling of RX in wlan driver.
3 */
4
5#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
6
7#include <linux/etherdevice.h>
8#include <linux/hardirq.h>
9#include <linux/slab.h>
10#include <linux/types.h>
11#include <linux/export.h>
12#include <net/cfg80211.h>
13
14#include "defs.h"
15#include "host.h"
16#include "radiotap.h"
17#include "decl.h"
18#include "dev.h"
19#include "mesh.h"
20
21struct eth803hdr {
22 u8 dest_addr[6];
23 u8 src_addr[6];
24 u16 h803_len;
25} __packed;
26
27struct rfc1042hdr {
28 u8 llc_dsap;
29 u8 llc_ssap;
30 u8 llc_ctrl;
31 u8 snap_oui[3];
32 u16 snap_type;
33} __packed;
34
35struct rxpackethdr {
36 struct eth803hdr eth803_hdr;
37 struct rfc1042hdr rfc1042_hdr;
38} __packed;
39
40struct rx80211packethdr {
41 struct rxpd rx_pd;
42 void *eth80211_hdr;
43} __packed;
44
45static int process_rxed_802_11_packet(struct lbs_private *priv,
46 struct sk_buff *skb);
47
48/**
49 * lbs_process_rxed_packet - processes received packet and forwards it
50 * to kernel/upper layer
51 *
52 * @priv: A pointer to &struct lbs_private
53 * @skb: A pointer to skb which includes the received packet
54 * returns: 0 or -1
55 */
56int lbs_process_rxed_packet(struct lbs_private *priv, struct sk_buff *skb)
57{
58 int ret = 0;
59 struct net_device *dev = priv->dev;
60 struct rxpackethdr *p_rx_pkt;
61 struct rxpd *p_rx_pd;
62 int hdrchop;
63 struct ethhdr *p_ethhdr;
64 static const u8 rfc1042_eth_hdr[] = {
65 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00
66 };
67
68 BUG_ON(!skb);
69
70 skb->ip_summed = CHECKSUM_NONE;
71
72 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
73 ret = process_rxed_802_11_packet(priv, skb);
74 goto done;
75 }
76
77 p_rx_pd = (struct rxpd *) skb->data;
78 p_rx_pkt = (struct rxpackethdr *) ((u8 *)p_rx_pd +
79 le32_to_cpu(p_rx_pd->pkt_ptr));
80
81 dev = lbs_mesh_set_dev(priv, dev, p_rx_pd);
82
83 lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data,
84 min_t(unsigned int, skb->len, 100));
85
86 if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
87 lbs_deb_rx("rx err: frame received with bad length\n");
88 dev->stats.rx_length_errors++;
89 ret = -EINVAL;
90 dev_kfree_skb(skb);
91 goto done;
92 }
93
94 lbs_deb_rx("rx data: skb->len - pkt_ptr = %d-%zd = %zd\n",
95 skb->len, (size_t)le32_to_cpu(p_rx_pd->pkt_ptr),
96 skb->len - (size_t)le32_to_cpu(p_rx_pd->pkt_ptr));
97
98 lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
99 sizeof(p_rx_pkt->eth803_hdr.dest_addr));
100 lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,
101 sizeof(p_rx_pkt->eth803_hdr.src_addr));
102
103 if (memcmp(&p_rx_pkt->rfc1042_hdr,
104 rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) {
105 /*
106 * Replace the 803 header and rfc1042 header (llc/snap) with an
107 * EthernetII header, keep the src/dst and snap_type (ethertype)
108 *
109 * The firmware only passes up SNAP frames converting
110 * all RX Data from 802.11 to 802.2/LLC/SNAP frames.
111 *
112 * To create the Ethernet II, just move the src, dst address right
113 * before the snap_type.
114 */
115 p_ethhdr = (struct ethhdr *)
116 ((u8 *) &p_rx_pkt->eth803_hdr
117 + sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)
118 - sizeof(p_rx_pkt->eth803_hdr.dest_addr)
119 - sizeof(p_rx_pkt->eth803_hdr.src_addr)
120 - sizeof(p_rx_pkt->rfc1042_hdr.snap_type));
121
122 memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,
123 sizeof(p_ethhdr->h_source));
124 memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,
125 sizeof(p_ethhdr->h_dest));
126
127 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap header
128 * that was removed
129 */
130 hdrchop = (u8 *)p_ethhdr - (u8 *)p_rx_pd;
131 } else {
132 lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP",
133 (u8 *) &p_rx_pkt->rfc1042_hdr,
134 sizeof(p_rx_pkt->rfc1042_hdr));
135
136 /* Chop off the rxpd */
137 hdrchop = (u8 *)&p_rx_pkt->eth803_hdr - (u8 *)p_rx_pd;
138 }
139
140 /* Chop off the leading header bytes so the skb points to the start of
141 * either the reconstructed EthII frame or the 802.2/llc/snap frame
142 */
143 skb_pull(skb, hdrchop);
144
145 priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate);
146
147 lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
148 dev->stats.rx_bytes += skb->len;
149 dev->stats.rx_packets++;
150
151 skb->protocol = eth_type_trans(skb, dev);
152 if (in_interrupt())
153 netif_rx(skb);
154 else
155 netif_rx_ni(skb);
156
157 ret = 0;
158done:
159 return ret;
160}
161EXPORT_SYMBOL_GPL(lbs_process_rxed_packet);
162
163/**
164 * convert_mv_rate_to_radiotap - converts Tx/Rx rates from Marvell WLAN format
165 * (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
166 *
167 * @rate: Input rate
168 * returns: Output Rate (0 if invalid)
169 */
170static u8 convert_mv_rate_to_radiotap(u8 rate)
171{
172 switch (rate) {
173 case 0: /* 1 Mbps */
174 return 2;
175 case 1: /* 2 Mbps */
176 return 4;
177 case 2: /* 5.5 Mbps */
178 return 11;
179 case 3: /* 11 Mbps */
180 return 22;
181 /* case 4: reserved */
182 case 5: /* 6 Mbps */
183 return 12;
184 case 6: /* 9 Mbps */
185 return 18;
186 case 7: /* 12 Mbps */
187 return 24;
188 case 8: /* 18 Mbps */
189 return 36;
190 case 9: /* 24 Mbps */
191 return 48;
192 case 10: /* 36 Mbps */
193 return 72;
194 case 11: /* 48 Mbps */
195 return 96;
196 case 12: /* 54 Mbps */
197 return 108;
198 }
199 pr_alert("Invalid Marvell WLAN rate %i\n", rate);
200 return 0;
201}
202
203/**
204 * process_rxed_802_11_packet - processes a received 802.11 packet and forwards
205 * it to kernel/upper layer
206 *
207 * @priv: A pointer to &struct lbs_private
208 * @skb: A pointer to skb which includes the received packet
209 * returns: 0 or -1
210 */
211static int process_rxed_802_11_packet(struct lbs_private *priv,
212 struct sk_buff *skb)
213{
214 int ret = 0;
215 struct net_device *dev = priv->dev;
216 struct rx80211packethdr *p_rx_pkt;
217 struct rxpd *prxpd;
218 struct rx_radiotap_hdr radiotap_hdr;
219 struct rx_radiotap_hdr *pradiotap_hdr;
220
221 p_rx_pkt = (struct rx80211packethdr *) skb->data;
222 prxpd = &p_rx_pkt->rx_pd;
223
224 /* lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100)); */
225
226 if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
227 lbs_deb_rx("rx err: frame received with bad length\n");
228 dev->stats.rx_length_errors++;
229 ret = -EINVAL;
230 kfree_skb(skb);
231 goto done;
232 }
233
234 lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
235 skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
236
237 /* create the exported radio header */
238
239 /* radiotap header */
240 memset(&radiotap_hdr, 0, sizeof(radiotap_hdr));
241 /* XXX must check radiotap_hdr.hdr.it_pad for pad */
242 radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));
243 radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT);
244 radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
245 /* XXX must check no carryout */
246 radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
247
248 /* chop the rxpd */
249 skb_pull(skb, sizeof(struct rxpd));
250
251 /* add space for the new radio header */
252 if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
253 pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0, GFP_ATOMIC)) {
254 netdev_alert(dev, "%s: couldn't pskb_expand_head\n", __func__);
255 ret = -ENOMEM;
256 kfree_skb(skb);
257 goto done;
258 }
259
260 pradiotap_hdr = skb_push(skb, sizeof(struct rx_radiotap_hdr));
261 memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr));
262
263 priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);
264
265 lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
266 dev->stats.rx_bytes += skb->len;
267 dev->stats.rx_packets++;
268
269 skb->protocol = eth_type_trans(skb, priv->dev);
270
271 if (in_interrupt())
272 netif_rx(skb);
273 else
274 netif_rx_ni(skb);
275
276 ret = 0;
277
278done:
279 return ret;
280}