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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * This file contains the handling of RX in wlan driver.4 */5 6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt7 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 22struct eth803hdr {23 u8 dest_addr[6];24 u8 src_addr[6];25 u16 h803_len;26} __packed;27 28struct 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 36struct rxpackethdr {37 struct eth803hdr eth803_hdr;38 struct rfc1042hdr rfc1042_hdr;39} __packed;40 41struct rx80211packethdr {42 struct rxpd rx_pd;43 void *eth80211_hdr;44} __packed;45 46static 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 it51 * to kernel/upper layer52 *53 * @priv: A pointer to &struct lbs_private54 * @skb: A pointer to skb which includes the received packet55 * returns: 0 or -156 */57int 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 66 BUG_ON(!skb);67 68 skb->ip_summed = CHECKSUM_NONE;69 70 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {71 ret = process_rxed_802_11_packet(priv, skb);72 goto done;73 }74 75 p_rx_pd = (struct rxpd *) skb->data;76 p_rx_pkt = (struct rxpackethdr *) ((u8 *)p_rx_pd +77 le32_to_cpu(p_rx_pd->pkt_ptr));78 79 dev = lbs_mesh_set_dev(priv, dev, p_rx_pd);80 81 lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data,82 min_t(unsigned int, skb->len, 100));83 84 if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {85 lbs_deb_rx("rx err: frame received with bad length\n");86 dev->stats.rx_length_errors++;87 ret = -EINVAL;88 dev_kfree_skb(skb);89 goto done;90 }91 92 lbs_deb_rx("rx data: skb->len - pkt_ptr = %d-%zd = %zd\n",93 skb->len, (size_t)le32_to_cpu(p_rx_pd->pkt_ptr),94 skb->len - (size_t)le32_to_cpu(p_rx_pd->pkt_ptr));95 96 lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,97 sizeof(p_rx_pkt->eth803_hdr.dest_addr));98 lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,99 sizeof(p_rx_pkt->eth803_hdr.src_addr));100 101 if (memcmp(&p_rx_pkt->rfc1042_hdr,102 rfc1042_header, sizeof(rfc1042_header)) == 0) {103 /*104 * Replace the 803 header and rfc1042 header (llc/snap) with an105 * EthernetII header, keep the src/dst and snap_type (ethertype)106 *107 * The firmware only passes up SNAP frames converting108 * all RX Data from 802.11 to 802.2/LLC/SNAP frames.109 *110 * To create the Ethernet II, just move the src, dst address right111 * before the snap_type.112 */113 p_ethhdr = (struct ethhdr *)114 ((u8 *) &p_rx_pkt->eth803_hdr115 + sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)116 - sizeof(p_rx_pkt->eth803_hdr.dest_addr)117 - sizeof(p_rx_pkt->eth803_hdr.src_addr)118 - sizeof(p_rx_pkt->rfc1042_hdr.snap_type));119 120 memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,121 sizeof(p_ethhdr->h_source));122 memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,123 sizeof(p_ethhdr->h_dest));124 125 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap header126 * that was removed127 */128 hdrchop = (u8 *)p_ethhdr - (u8 *)p_rx_pd;129 } else {130 lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP",131 (u8 *) &p_rx_pkt->rfc1042_hdr,132 sizeof(p_rx_pkt->rfc1042_hdr));133 134 /* Chop off the rxpd */135 hdrchop = (u8 *)&p_rx_pkt->eth803_hdr - (u8 *)p_rx_pd;136 }137 138 /* Chop off the leading header bytes so the skb points to the start of139 * either the reconstructed EthII frame or the 802.2/llc/snap frame140 */141 skb_pull(skb, hdrchop);142 143 priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate);144 145 lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);146 dev->stats.rx_bytes += skb->len;147 dev->stats.rx_packets++;148 149 skb->protocol = eth_type_trans(skb, dev);150 netif_rx(skb);151 152 ret = 0;153done:154 return ret;155}156EXPORT_SYMBOL_GPL(lbs_process_rxed_packet);157 158/**159 * convert_mv_rate_to_radiotap - converts Tx/Rx rates from Marvell WLAN format160 * (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)161 *162 * @rate: Input rate163 * returns: Output Rate (0 if invalid)164 */165static u8 convert_mv_rate_to_radiotap(u8 rate)166{167 switch (rate) {168 case 0: /* 1 Mbps */169 return 2;170 case 1: /* 2 Mbps */171 return 4;172 case 2: /* 5.5 Mbps */173 return 11;174 case 3: /* 11 Mbps */175 return 22;176 /* case 4: reserved */177 case 5: /* 6 Mbps */178 return 12;179 case 6: /* 9 Mbps */180 return 18;181 case 7: /* 12 Mbps */182 return 24;183 case 8: /* 18 Mbps */184 return 36;185 case 9: /* 24 Mbps */186 return 48;187 case 10: /* 36 Mbps */188 return 72;189 case 11: /* 48 Mbps */190 return 96;191 case 12: /* 54 Mbps */192 return 108;193 }194 pr_alert("Invalid Marvell WLAN rate %i\n", rate);195 return 0;196}197 198/**199 * process_rxed_802_11_packet - processes a received 802.11 packet and forwards200 * it to kernel/upper layer201 *202 * @priv: A pointer to &struct lbs_private203 * @skb: A pointer to skb which includes the received packet204 * returns: 0 or -1205 */206static int process_rxed_802_11_packet(struct lbs_private *priv,207 struct sk_buff *skb)208{209 int ret = 0;210 struct net_device *dev = priv->dev;211 struct rx80211packethdr *p_rx_pkt;212 struct rxpd *prxpd;213 struct rx_radiotap_hdr radiotap_hdr;214 struct rx_radiotap_hdr *pradiotap_hdr;215 216 p_rx_pkt = (struct rx80211packethdr *) skb->data;217 prxpd = &p_rx_pkt->rx_pd;218 219 /* lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100)); */220 221 if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {222 lbs_deb_rx("rx err: frame received with bad length\n");223 dev->stats.rx_length_errors++;224 ret = -EINVAL;225 kfree_skb(skb);226 goto done;227 }228 229 lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",230 skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));231 232 /* create the exported radio header */233 234 /* radiotap header */235 memset(&radiotap_hdr, 0, sizeof(radiotap_hdr));236 /* XXX must check radiotap_hdr.hdr.it_pad for pad */237 radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));238 radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT);239 radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);240 /* XXX must check no carryout */241 radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;242 243 /* chop the rxpd */244 skb_pull(skb, sizeof(struct rxpd));245 246 /* add space for the new radio header */247 if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&248 pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0, GFP_ATOMIC)) {249 netdev_alert(dev, "%s: couldn't pskb_expand_head\n", __func__);250 ret = -ENOMEM;251 kfree_skb(skb);252 goto done;253 }254 255 pradiotap_hdr = skb_push(skb, sizeof(struct rx_radiotap_hdr));256 memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr));257 258 priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);259 260 lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);261 dev->stats.rx_bytes += skb->len;262 dev->stats.rx_packets++;263 264 skb->protocol = eth_type_trans(skb, priv->dev);265 netif_rx(skb);266 267 ret = 0;268 269done:270 return ret;271}272