1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * This file contains the handling of RX in wlan driver. 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/etherdevice.h> 9 #include <linux/hardirq.h> 10 #include <linux/slab.h> 11 #include <linux/types.h> 12 #include <linux/export.h> 13 #include <net/cfg80211.h> 14 15 #include "defs.h" 16 #include "host.h" 17 #include "radiotap.h" 18 #include "decl.h" 19 #include "dev.h" 20 #include "mesh.h" 21 22 struct eth803hdr { 23 u8 dest_addr[6]; 24 u8 src_addr[6]; 25 u16 h803_len; 26 } __packed; 27 28 struct rfc1042hdr { 29 u8 llc_dsap; 30 u8 llc_ssap; 31 u8 llc_ctrl; 32 u8 snap_oui[3]; 33 u16 snap_type; 34 } __packed; 35 36 struct rxpackethdr { 37 struct eth803hdr eth803_hdr; 38 struct rfc1042hdr rfc1042_hdr; 39 } __packed; 40 41 struct rx80211packethdr { 42 struct rxpd rx_pd; 43 void *eth80211_hdr; 44 } __packed; 45 46 static int process_rxed_802_11_packet(struct lbs_private *priv, 47 struct sk_buff *skb); 48 49 /** 50 * lbs_process_rxed_packet - processes received packet and forwards it 51 * to kernel/upper layer 52 * 53 * @priv: A pointer to &struct lbs_private 54 * @skb: A pointer to skb which includes the received packet 55 * returns: 0 or -1 56 */ 57 int lbs_process_rxed_packet(struct lbs_private *priv, struct sk_buff *skb) 58 { 59 int ret = 0; 60 struct net_device *dev = priv->dev; 61 struct rxpackethdr *p_rx_pkt; 62 struct rxpd *p_rx_pd; 63 int hdrchop; 64 struct ethhdr *p_ethhdr; 65 static const u8 rfc1042_eth_hdr[] = { 66 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 67 }; 68 69 BUG_ON(!skb); 70 71 skb->ip_summed = CHECKSUM_NONE; 72 73 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) { 74 ret = process_rxed_802_11_packet(priv, skb); 75 goto done; 76 } 77 78 p_rx_pd = (struct rxpd *) skb->data; 79 p_rx_pkt = (struct rxpackethdr *) ((u8 *)p_rx_pd + 80 le32_to_cpu(p_rx_pd->pkt_ptr)); 81 82 dev = lbs_mesh_set_dev(priv, dev, p_rx_pd); 83 84 lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, 85 min_t(unsigned int, skb->len, 100)); 86 87 if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) { 88 lbs_deb_rx("rx err: frame received with bad length\n"); 89 dev->stats.rx_length_errors++; 90 ret = -EINVAL; 91 dev_kfree_skb(skb); 92 goto done; 93 } 94 95 lbs_deb_rx("rx data: skb->len - pkt_ptr = %d-%zd = %zd\n", 96 skb->len, (size_t)le32_to_cpu(p_rx_pd->pkt_ptr), 97 skb->len - (size_t)le32_to_cpu(p_rx_pd->pkt_ptr)); 98 99 lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr, 100 sizeof(p_rx_pkt->eth803_hdr.dest_addr)); 101 lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr, 102 sizeof(p_rx_pkt->eth803_hdr.src_addr)); 103 104 if (memcmp(&p_rx_pkt->rfc1042_hdr, 105 rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) { 106 /* 107 * Replace the 803 header and rfc1042 header (llc/snap) with an 108 * EthernetII header, keep the src/dst and snap_type (ethertype) 109 * 110 * The firmware only passes up SNAP frames converting 111 * all RX Data from 802.11 to 802.2/LLC/SNAP frames. 112 * 113 * To create the Ethernet II, just move the src, dst address right 114 * before the snap_type. 115 */ 116 p_ethhdr = (struct ethhdr *) 117 ((u8 *) &p_rx_pkt->eth803_hdr 118 + sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr) 119 - sizeof(p_rx_pkt->eth803_hdr.dest_addr) 120 - sizeof(p_rx_pkt->eth803_hdr.src_addr) 121 - sizeof(p_rx_pkt->rfc1042_hdr.snap_type)); 122 123 memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr, 124 sizeof(p_ethhdr->h_source)); 125 memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr, 126 sizeof(p_ethhdr->h_dest)); 127 128 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap header 129 * that was removed 130 */ 131 hdrchop = (u8 *)p_ethhdr - (u8 *)p_rx_pd; 132 } else { 133 lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP", 134 (u8 *) &p_rx_pkt->rfc1042_hdr, 135 sizeof(p_rx_pkt->rfc1042_hdr)); 136 137 /* Chop off the rxpd */ 138 hdrchop = (u8 *)&p_rx_pkt->eth803_hdr - (u8 *)p_rx_pd; 139 } 140 141 /* Chop off the leading header bytes so the skb points to the start of 142 * either the reconstructed EthII frame or the 802.2/llc/snap frame 143 */ 144 skb_pull(skb, hdrchop); 145 146 priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate); 147 148 lbs_deb_rx("rx data: size of actual packet %d\n", skb->len); 149 dev->stats.rx_bytes += skb->len; 150 dev->stats.rx_packets++; 151 152 skb->protocol = eth_type_trans(skb, dev); 153 if (in_interrupt()) 154 netif_rx(skb); 155 else 156 netif_rx_ni(skb); 157 158 ret = 0; 159 done: 160 return ret; 161 } 162 EXPORT_SYMBOL_GPL(lbs_process_rxed_packet); 163 164 /** 165 * convert_mv_rate_to_radiotap - converts Tx/Rx rates from Marvell WLAN format 166 * (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s) 167 * 168 * @rate: Input rate 169 * returns: Output Rate (0 if invalid) 170 */ 171 static u8 convert_mv_rate_to_radiotap(u8 rate) 172 { 173 switch (rate) { 174 case 0: /* 1 Mbps */ 175 return 2; 176 case 1: /* 2 Mbps */ 177 return 4; 178 case 2: /* 5.5 Mbps */ 179 return 11; 180 case 3: /* 11 Mbps */ 181 return 22; 182 /* case 4: reserved */ 183 case 5: /* 6 Mbps */ 184 return 12; 185 case 6: /* 9 Mbps */ 186 return 18; 187 case 7: /* 12 Mbps */ 188 return 24; 189 case 8: /* 18 Mbps */ 190 return 36; 191 case 9: /* 24 Mbps */ 192 return 48; 193 case 10: /* 36 Mbps */ 194 return 72; 195 case 11: /* 48 Mbps */ 196 return 96; 197 case 12: /* 54 Mbps */ 198 return 108; 199 } 200 pr_alert("Invalid Marvell WLAN rate %i\n", rate); 201 return 0; 202 } 203 204 /** 205 * process_rxed_802_11_packet - processes a received 802.11 packet and forwards 206 * it to kernel/upper layer 207 * 208 * @priv: A pointer to &struct lbs_private 209 * @skb: A pointer to skb which includes the received packet 210 * returns: 0 or -1 211 */ 212 static int process_rxed_802_11_packet(struct lbs_private *priv, 213 struct sk_buff *skb) 214 { 215 int ret = 0; 216 struct net_device *dev = priv->dev; 217 struct rx80211packethdr *p_rx_pkt; 218 struct rxpd *prxpd; 219 struct rx_radiotap_hdr radiotap_hdr; 220 struct rx_radiotap_hdr *pradiotap_hdr; 221 222 p_rx_pkt = (struct rx80211packethdr *) skb->data; 223 prxpd = &p_rx_pkt->rx_pd; 224 225 /* lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100)); */ 226 227 if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) { 228 lbs_deb_rx("rx err: frame received with bad length\n"); 229 dev->stats.rx_length_errors++; 230 ret = -EINVAL; 231 kfree_skb(skb); 232 goto done; 233 } 234 235 lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n", 236 skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd)); 237 238 /* create the exported radio header */ 239 240 /* radiotap header */ 241 memset(&radiotap_hdr, 0, sizeof(radiotap_hdr)); 242 /* XXX must check radiotap_hdr.hdr.it_pad for pad */ 243 radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr)); 244 radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT); 245 radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate); 246 /* XXX must check no carryout */ 247 radiotap_hdr.antsignal = prxpd->snr + prxpd->nf; 248 249 /* chop the rxpd */ 250 skb_pull(skb, sizeof(struct rxpd)); 251 252 /* add space for the new radio header */ 253 if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) && 254 pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0, GFP_ATOMIC)) { 255 netdev_alert(dev, "%s: couldn't pskb_expand_head\n", __func__); 256 ret = -ENOMEM; 257 kfree_skb(skb); 258 goto done; 259 } 260 261 pradiotap_hdr = skb_push(skb, sizeof(struct rx_radiotap_hdr)); 262 memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr)); 263 264 priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate); 265 266 lbs_deb_rx("rx data: size of actual packet %d\n", skb->len); 267 dev->stats.rx_bytes += skb->len; 268 dev->stats.rx_packets++; 269 270 skb->protocol = eth_type_trans(skb, priv->dev); 271 272 if (in_interrupt()) 273 netif_rx(skb); 274 else 275 netif_rx_ni(skb); 276 277 ret = 0; 278 279 done: 280 return ret; 281 } 282