mirror of https://github.com/hak5/openwrt.git
401 lines
11 KiB
C
401 lines
11 KiB
C
/**
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* This file contains the handling of RX in wlan driver.
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*/
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#include <linux/etherdevice.h>
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#include <linux/types.h>
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#include "hostcmd.h"
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#include "radiotap.h"
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#include "decl.h"
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#include "dev.h"
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#include "wext.h"
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struct eth803hdr {
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u8 dest_addr[6];
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u8 src_addr[6];
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u16 h803_len;
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} __attribute__ ((packed));
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struct rfc1042hdr {
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u8 llc_dsap;
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u8 llc_ssap;
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u8 llc_ctrl;
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u8 snap_oui[3];
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u16 snap_type;
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} __attribute__ ((packed));
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struct rxpackethdr {
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struct rxpd rx_pd;
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struct eth803hdr eth803_hdr;
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struct rfc1042hdr rfc1042_hdr;
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} __attribute__ ((packed));
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struct rx80211packethdr {
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struct rxpd rx_pd;
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void *eth80211_hdr;
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} __attribute__ ((packed));
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static int process_rxed_802_11_packet(struct lbs_private *priv,
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struct sk_buff *skb);
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/**
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* @brief This function computes the avgSNR .
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*
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* @param priv A pointer to struct lbs_private structure
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* @return avgSNR
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*/
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static u8 lbs_getavgsnr(struct lbs_private *priv)
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{
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u8 i;
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u16 temp = 0;
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if (priv->numSNRNF == 0)
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return 0;
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for (i = 0; i < priv->numSNRNF; i++)
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temp += priv->rawSNR[i];
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return (u8) (temp / priv->numSNRNF);
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}
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/**
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* @brief This function computes the AvgNF
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*
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* @param priv A pointer to struct lbs_private structure
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* @return AvgNF
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*/
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static u8 lbs_getavgnf(struct lbs_private *priv)
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{
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u8 i;
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u16 temp = 0;
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if (priv->numSNRNF == 0)
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return 0;
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for (i = 0; i < priv->numSNRNF; i++)
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temp += priv->rawNF[i];
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return (u8) (temp / priv->numSNRNF);
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}
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/**
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* @brief This function save the raw SNR/NF to our internel buffer
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*
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* @param priv A pointer to struct lbs_private structure
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* @param prxpd A pointer to rxpd structure of received packet
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* @return n/a
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*/
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static void lbs_save_rawSNRNF(struct lbs_private *priv, struct rxpd *p_rx_pd)
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{
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if (priv->numSNRNF < DEFAULT_DATA_AVG_FACTOR)
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priv->numSNRNF++;
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priv->rawSNR[priv->nextSNRNF] = p_rx_pd->snr;
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priv->rawNF[priv->nextSNRNF] = p_rx_pd->nf;
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priv->nextSNRNF++;
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if (priv->nextSNRNF >= DEFAULT_DATA_AVG_FACTOR)
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priv->nextSNRNF = 0;
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return;
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}
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/**
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* @brief This function computes the RSSI in received packet.
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*
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* @param priv A pointer to struct lbs_private structure
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* @param prxpd A pointer to rxpd structure of received packet
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* @return n/a
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*/
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static void lbs_compute_rssi(struct lbs_private *priv, struct rxpd *p_rx_pd)
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{
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lbs_deb_enter(LBS_DEB_RX);
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lbs_deb_rx("rxpd: SNR %d, NF %d\n", p_rx_pd->snr, p_rx_pd->nf);
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lbs_deb_rx("before computing SNR: SNR-avg = %d, NF-avg = %d\n",
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priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
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priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
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priv->SNR[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->snr;
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priv->NF[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->nf;
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lbs_save_rawSNRNF(priv, p_rx_pd);
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priv->SNR[TYPE_RXPD][TYPE_AVG] = lbs_getavgsnr(priv) * AVG_SCALE;
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priv->NF[TYPE_RXPD][TYPE_AVG] = lbs_getavgnf(priv) * AVG_SCALE;
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lbs_deb_rx("after computing SNR: SNR-avg = %d, NF-avg = %d\n",
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priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
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priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
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priv->RSSI[TYPE_RXPD][TYPE_NOAVG] =
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CAL_RSSI(priv->SNR[TYPE_RXPD][TYPE_NOAVG],
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priv->NF[TYPE_RXPD][TYPE_NOAVG]);
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priv->RSSI[TYPE_RXPD][TYPE_AVG] =
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CAL_RSSI(priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
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priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
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lbs_deb_leave(LBS_DEB_RX);
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}
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/**
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* @brief This function processes received packet and forwards it
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* to kernel/upper layer
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*
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* @param priv A pointer to struct lbs_private
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* @param skb A pointer to skb which includes the received packet
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* @return 0 or -1
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*/
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int lbs_process_rxed_packet(struct lbs_private *priv, struct sk_buff *skb)
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{
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int ret = 0;
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struct net_device *dev = priv->dev;
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struct rxpackethdr *p_rx_pkt;
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struct rxpd *p_rx_pd;
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int hdrchop;
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struct ethhdr *p_ethhdr;
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const u8 rfc1042_eth_hdr[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
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lbs_deb_enter(LBS_DEB_RX);
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skb->ip_summed = CHECKSUM_NONE;
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if (priv->monitormode != LBS_MONITOR_OFF)
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return process_rxed_802_11_packet(priv, skb);
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p_rx_pkt = (struct rxpackethdr *) skb->data;
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p_rx_pd = &p_rx_pkt->rx_pd;
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if (priv->mesh_dev && (p_rx_pd->rx_control & RxPD_MESH_FRAME))
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dev = priv->mesh_dev;
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lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data,
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min_t(unsigned int, skb->len, 100));
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if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
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lbs_deb_rx("rx err: frame received with bad length\n");
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priv->stats.rx_length_errors++;
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ret = 0;
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goto done;
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}
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/*
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* Check rxpd status and update 802.3 stat,
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*/
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if (!(p_rx_pd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK))) {
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lbs_deb_rx("rx err: frame received with bad status\n");
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lbs_pr_alert("rxpd not ok\n");
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priv->stats.rx_errors++;
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ret = 0;
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goto done;
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}
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lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
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skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
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lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
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sizeof(p_rx_pkt->eth803_hdr.dest_addr));
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lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,
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sizeof(p_rx_pkt->eth803_hdr.src_addr));
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if (memcmp(&p_rx_pkt->rfc1042_hdr,
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rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) {
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/*
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* Replace the 803 header and rfc1042 header (llc/snap) with an
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* EthernetII header, keep the src/dst and snap_type (ethertype)
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*
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* The firmware only passes up SNAP frames converting
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* all RX Data from 802.11 to 802.2/LLC/SNAP frames.
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*
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* To create the Ethernet II, just move the src, dst address right
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* before the snap_type.
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*/
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p_ethhdr = (struct ethhdr *)
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((u8 *) & p_rx_pkt->eth803_hdr
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+ sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)
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- sizeof(p_rx_pkt->eth803_hdr.dest_addr)
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- sizeof(p_rx_pkt->eth803_hdr.src_addr)
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- sizeof(p_rx_pkt->rfc1042_hdr.snap_type));
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memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,
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sizeof(p_ethhdr->h_source));
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memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,
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sizeof(p_ethhdr->h_dest));
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/* Chop off the rxpd + the excess memory from the 802.2/llc/snap header
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* that was removed
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*/
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hdrchop = (u8 *) p_ethhdr - (u8 *) p_rx_pkt;
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} else {
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lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP",
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(u8 *) & p_rx_pkt->rfc1042_hdr,
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sizeof(p_rx_pkt->rfc1042_hdr));
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/* Chop off the rxpd */
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hdrchop = (u8 *) & p_rx_pkt->eth803_hdr - (u8 *) p_rx_pkt;
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}
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/* Chop off the leading header bytes so the skb points to the start of
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* either the reconstructed EthII frame or the 802.2/llc/snap frame
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*/
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skb_pull(skb, hdrchop);
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/* Take the data rate from the rxpd structure
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* only if the rate is auto
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*/
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if (priv->auto_rate)
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priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate);
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lbs_compute_rssi(priv, p_rx_pd);
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lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
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priv->stats.rx_bytes += skb->len;
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priv->stats.rx_packets++;
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skb->protocol = eth_type_trans(skb, dev);
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netif_rx(skb);
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ret = 0;
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done:
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lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(lbs_process_rxed_packet);
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/**
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* @brief This function converts Tx/Rx rates from the Marvell WLAN format
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* (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
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*
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* @param rate Input rate
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* @return Output Rate (0 if invalid)
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*/
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static u8 convert_mv_rate_to_radiotap(u8 rate)
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{
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switch (rate) {
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case 0: /* 1 Mbps */
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return 2;
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case 1: /* 2 Mbps */
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return 4;
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case 2: /* 5.5 Mbps */
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return 11;
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case 3: /* 11 Mbps */
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return 22;
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/* case 4: reserved */
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case 5: /* 6 Mbps */
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return 12;
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case 6: /* 9 Mbps */
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return 18;
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case 7: /* 12 Mbps */
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return 24;
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case 8: /* 18 Mbps */
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return 36;
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case 9: /* 24 Mbps */
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return 48;
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case 10: /* 36 Mbps */
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return 72;
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case 11: /* 48 Mbps */
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return 96;
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case 12: /* 54 Mbps */
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return 108;
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}
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lbs_pr_alert("Invalid Marvell WLAN rate %i\n", rate);
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return 0;
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}
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/**
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* @brief This function processes a received 802.11 packet and forwards it
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* to kernel/upper layer
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*
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* @param priv A pointer to struct lbs_private
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* @param skb A pointer to skb which includes the received packet
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* @return 0 or -1
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*/
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static int process_rxed_802_11_packet(struct lbs_private *priv,
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struct sk_buff *skb)
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{
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int ret = 0;
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struct rx80211packethdr *p_rx_pkt;
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struct rxpd *prxpd;
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struct rx_radiotap_hdr radiotap_hdr;
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struct rx_radiotap_hdr *pradiotap_hdr;
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lbs_deb_enter(LBS_DEB_RX);
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p_rx_pkt = (struct rx80211packethdr *) skb->data;
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prxpd = &p_rx_pkt->rx_pd;
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// lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100));
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if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
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lbs_deb_rx("rx err: frame received with bad length\n");
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priv->stats.rx_length_errors++;
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ret = -EINVAL;
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kfree(skb);
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goto done;
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}
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/*
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* Check rxpd status and update 802.3 stat,
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*/
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if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK))) {
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//lbs_deb_rx("rx err: frame received with bad status\n");
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priv->stats.rx_errors++;
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}
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lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
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skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
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/* create the exported radio header */
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/* radiotap header */
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radiotap_hdr.hdr.it_version = 0;
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/* XXX must check this value for pad */
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radiotap_hdr.hdr.it_pad = 0;
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radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));
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radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT);
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/* unknown values */
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radiotap_hdr.flags = 0;
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radiotap_hdr.chan_freq = 0;
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radiotap_hdr.chan_flags = 0;
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radiotap_hdr.antenna = 0;
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/* known values */
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radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
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/* XXX must check no carryout */
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radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
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radiotap_hdr.rx_flags = 0;
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if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK)))
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radiotap_hdr.rx_flags |= IEEE80211_RADIOTAP_F_RX_BADFCS;
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//memset(radiotap_hdr.pad, 0x11, IEEE80211_RADIOTAP_HDRLEN - 18);
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/* chop the rxpd */
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skb_pull(skb, sizeof(struct rxpd));
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/* add space for the new radio header */
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if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
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pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0, GFP_ATOMIC)) {
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lbs_pr_alert("%s: couldn't pskb_expand_head\n", __func__);
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ret = -ENOMEM;
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kfree_skb(skb);
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goto done;
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}
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pradiotap_hdr = (void *)skb_push(skb, sizeof(struct rx_radiotap_hdr));
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memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr));
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/* Take the data rate from the rxpd structure
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* only if the rate is auto
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*/
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if (priv->auto_rate)
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priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);
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lbs_compute_rssi(priv, prxpd);
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lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
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priv->stats.rx_bytes += skb->len;
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priv->stats.rx_packets++;
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skb->protocol = eth_type_trans(skb, priv->rtap_net_dev);
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netif_rx(skb);
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ret = 0;
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done:
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lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
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return ret;
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}
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