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 21 struct eth803hdr { 22 u8 dest_addr[6]; 23 u8 src_addr[6]; 24 u16 h803_len; 25 } __packed; 26 27 struct 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 35 struct rxpackethdr { 36 struct eth803hdr eth803_hdr; 37 struct rfc1042hdr rfc1042_hdr; 38 } __packed; 39 40 struct rx80211packethdr { 41 struct rxpd rx_pd; 42 void *eth80211_hdr; 43 } __packed; 44 45 static 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 */ 56 int 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; 158 done: 159 return ret; 160 } 161 EXPORT_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 */ 170 static 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 */ 211 static 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; 277 278 done: 279 return ret; 280 } 281