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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
385 lines
11 KiB
C
385 lines
11 KiB
C
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/*
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* ---------------------------------------------------------------------------
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* FILE: monitor.c
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*
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* Copyright (C) 2006-2008 by Cambridge Silicon Radio Ltd.
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*
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* Refer to LICENSE.txt included with this source code for details on
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* the license terms.
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*
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* ---------------------------------------------------------------------------
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*/
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#include "unifi_priv.h"
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#ifdef UNIFI_SNIFF_ARPHRD
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#if (UNIFI_SNIFF_ARPHRD == ARPHRD_IEEE80211_RADIOTAP)
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#include <net/ieee80211_radiotap.h>
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#endif
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#ifndef ETH_P_80211_RAW
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#define ETH_P_80211_RAW ETH_P_ALL
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#endif
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/*
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* ---------------------------------------------------------------------------
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* uf_start_sniff
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*
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* Start UniFi capture in SNIFF mode, i.e capture everything it hears.
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*
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* Arguments:
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* priv Pointer to device private context struct
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*
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* Returns:
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* 0 on success or kernel error code
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* ---------------------------------------------------------------------------
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*/
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int
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uf_start_sniff(unifi_priv_t *priv)
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{
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ul_client_t *pcli = priv->wext_client;
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CSR_SIGNAL signal;
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CSR_MLME_SNIFFJOIN_REQUEST *req = &signal.u.MlmeSniffjoinRequest;
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int timeout = 1000;
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int r;
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req->Ifindex = priv->if_index;
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req->Channel = priv->wext_conf.channel;
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req->ChannelStartingFactor = 0;
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signal.SignalPrimitiveHeader.SignalId = CSR_MLME_SNIFFJOIN_REQUEST_ID;
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r = unifi_mlme_blocking_request(priv, pcli, &signal, NULL, timeout);
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if (r < 0) {
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unifi_error(priv, "failed to send SNIFFJOIN request, error %d\n", r);
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return r;
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}
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r = pcli->reply_signal->u.MlmeSniffjoinConfirm.Resultcode;
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if (r) {
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unifi_notice(priv, "SNIFFJOIN request was rejected with result 0x%X (%s)\n",
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r, lookup_result_code(r));
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return -EIO;
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}
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return 0;
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} /* uf_start_sniff() */
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/*
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* ---------------------------------------------------------------------------
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* netrx_radiotap
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*
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* Reformat a UniFi SNIFFDATA signal into a radiotap packet.
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*
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* Arguments:
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* priv OS private context pointer.
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* ind Pointer to a MA_UNITDATA_INDICATION or
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* DS_UNITDATA_INDICATION indication structure.
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*
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* Notes:
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* Radiotap header values are all little-endian, UniFi signals will have
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* been converted to host-endian.
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* ---------------------------------------------------------------------------
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*/
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#if (UNIFI_SNIFF_ARPHRD == ARPHRD_IEEE80211_RADIOTAP)
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static void
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netrx_radiotap(unifi_priv_t *priv,
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const CSR_MA_SNIFFDATA_INDICATION *ind,
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struct sk_buff *skb_orig)
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{
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struct net_device *dev = priv->netdev;
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struct sk_buff *skb = NULL;
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unsigned char *ptr;
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unsigned char *base;
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int ind_data_len = skb_orig->len - 2 - ETH_HLEN;
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struct unifi_rx_radiotap_header {
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struct ieee80211_radiotap_header rt_hdr;
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/* IEEE80211_RADIOTAP_TSFT */
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u64 rt_tsft;
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/* IEEE80211_RADIOTAP_FLAGS */
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u8 rt_flags;
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/* IEEE80211_RADIOTAP_RATE */
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u8 rt_rate;
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/* IEEE80211_RADIOTAP_CHANNEL */
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u16 rt_chan;
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u16 rt_chan_flags;
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/* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
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u8 rt_dbm_antsignal;
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/* IEEE80211_RADIOTAP_DBM_ANTNOISE */
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u8 rt_dbm_antnoise;
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/* IEEE80211_RADIOTAP_ANTENNA */
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u8 rt_antenna;
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/* pad to 4-byte boundary */
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u8 pad[3];
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} __attribute__((__packed__));
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struct unifi_rx_radiotap_header *unifi_rt;
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int signal, noise, snr;
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if (ind_data_len <= 0) {
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unifi_error(priv, "Invalid length in CSR_MA_SNIFFDATA_INDICATION.\n");
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return;
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}
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/*
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* Allocate a SKB for the received data packet, including radiotap
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* header.
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*/
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skb = dev_alloc_skb(ind_data_len + sizeof(struct unifi_rx_radiotap_header) + 4);
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if (! skb) {
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unifi_error(priv, "alloc_skb failed.\n");
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priv->stats.rx_errors++;
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return;
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}
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base = skb->data;
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/* Reserve the radiotap header at the front of skb */
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unifi_rt = (struct unifi_rx_radiotap_header *)
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skb_put(skb, sizeof(struct unifi_rx_radiotap_header));
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/* Copy in the 802.11 frame */
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ptr = skb_put(skb, ind_data_len);
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memcpy(ptr, skb_orig->data, ind_data_len);
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unifi_rt->rt_hdr.it_version = PKTHDR_RADIOTAP_VERSION;
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unifi_rt->rt_hdr.it_pad = 0; /* always good to zero */
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unifi_rt->rt_hdr.it_len = sizeof(struct unifi_rx_radiotap_header);
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/* Big bitfield of all the fields we provide in radiotap */
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unifi_rt->rt_hdr.it_present = 0
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| (1 << IEEE80211_RADIOTAP_TSFT)
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| (1 << IEEE80211_RADIOTAP_FLAGS)
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| (1 << IEEE80211_RADIOTAP_RATE)
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| (1 << IEEE80211_RADIOTAP_CHANNEL)
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| (1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL)
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| (1 << IEEE80211_RADIOTAP_DBM_ANTNOISE)
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| (1 << IEEE80211_RADIOTAP_ANTENNA)
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;
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/* No flags to set */
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unifi_rt->rt_tsft = (((u64)ind->Timestamp.x[7]) | (((u64)ind->Timestamp.x[6]) << 8) |
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(((u64)ind->Timestamp.x[5]) << 16) | (((u64)ind->Timestamp.x[4]) << 24) |
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(((u64)ind->Timestamp.x[3]) << 32) | (((u64)ind->Timestamp.x[2]) << 40) |
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(((u64)ind->Timestamp.x[1]) << 48) | (((u64)ind->Timestamp.x[0]) << 56));
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unifi_rt->rt_flags = 0;
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unifi_rt->rt_rate = ind->Rate;
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unifi_rt->rt_chan = cpu_to_le16(ieee80211chan2mhz(priv->wext_conf.channel));
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unifi_rt->rt_chan_flags = 0;
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/* Convert signal to dBm */
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signal = (s16)unifi2host_16(ind->Rssi); /* in dBm */
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snr = (s16)unifi2host_16(ind->Snr); /* in dB */
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noise = signal - snr;
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unifi_rt->rt_dbm_antsignal = signal;
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unifi_rt->rt_dbm_antnoise = noise;
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unifi_rt->rt_antenna = ind->AntennaId;
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skb->dev = dev;
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skb->mac_header = skb->data;
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skb->pkt_type = PACKET_OTHERHOST;
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skb->protocol = __constant_htons(ETH_P_80211_RAW);
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memset(skb->cb, 0, sizeof(skb->cb));
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/* Pass up to Linux network stack */
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netif_rx_ni(skb);
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dev->last_rx = jiffies;
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/* Bump the rx stats */
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priv->stats.rx_packets++;
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priv->stats.rx_bytes += ind_data_len;
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} /* netrx_radiotap() */
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#endif /* RADIOTAP */
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/*
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* ---------------------------------------------------------------------------
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* netrx_prism
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*
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* Reformat a UniFi SNIFFDATA signal into a Prism format sniff packet.
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*
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* Arguments:
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* priv OS private context pointer.
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* ind Pointer to a MA_UNITDATA_INDICATION or
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* DS_UNITDATA_INDICATION indication structure.
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*
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* Notes:
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* Radiotap header values are all little-endian, UniFi signals will have
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* been converted to host-endian.
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* ---------------------------------------------------------------------------
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*/
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#if (UNIFI_SNIFF_ARPHRD == ARPHRD_IEEE80211_PRISM)
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static void
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netrx_prism(unifi_priv_t *priv,
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const CSR_MA_SNIFFDATA_INDICATION *ind,
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struct sk_buff *skb_orig)
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{
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struct net_device *dev = priv->netdev;
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struct sk_buff *skb = NULL;
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unsigned char *ptr;
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unsigned char *base;
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int ind_data_len = skb_orig->len - 2 - ETH_HLEN;
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#define WLANCAP_MAGIC_COOKIE_V1 0x80211001
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struct avs_header_v1 {
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uint32 version;
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uint32 length;
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uint64 mactime;
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uint64 hosttime;
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uint32 phytype;
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uint32 channel;
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uint32 datarate;
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uint32 antenna;
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uint32 priority;
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uint32 ssi_type;
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int32 ssi_signal;
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int32 ssi_noise;
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uint32 preamble;
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uint32 encoding;
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} *avs;
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int signal, noise, snr;
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if (ind_data_len <= 0) {
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unifi_error(priv, "Invalid length in CSR_MA_SNIFFDATA_INDICATION.\n");
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return;
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}
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/*
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* Allocate a SKB for the received data packet, including radiotap
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* header.
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*/
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skb = dev_alloc_skb(ind_data_len + sizeof(struct avs_header_v1) + 4);
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if (! skb) {
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unifi_error(priv, "alloc_skb failed.\n");
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priv->stats.rx_errors++;
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return;
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}
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base = skb->data;
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/* Reserve the radiotap header at the front of skb */
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avs = (struct avs_header_v1 *)skb_put(skb, sizeof(struct avs_header_v1));
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/* Copy in the 802.11 frame */
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ptr = skb_put(skb, ind_data_len);
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memcpy(ptr, skb_orig->data, ind_data_len);
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/* Convert signal to dBm */
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signal = 0x10000 - ((s16)unifi2host_16(ind->Rssi)); /* in dBm */
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snr = (s16)unifi2host_16(ind->Snr); /* in dB */
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noise = signal - snr;
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avs->version = htonl(WLANCAP_MAGIC_COOKIE_V1);
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avs->length = htonl(sizeof(struct avs_header_v1));
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avs->mactime = __cpu_to_be64(ind->Timestamp);
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avs->hosttime = __cpu_to_be64(jiffies);
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avs->phytype = htonl(9); /* dss_ofdm_dot11_g */
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avs->channel = htonl(priv->wext_conf.channel);
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avs->datarate = htonl(ind->Rate * 5);
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avs->antenna = htonl(ind->Antenna);
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avs->priority = htonl(0); /* unknown */
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avs->ssi_type = htonl(2); /* dBm */
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avs->ssi_signal = htonl(signal);
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avs->ssi_noise = htonl(noise);
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avs->preamble = htonl(0); /* unknown */
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avs->encoding = htonl(0); /* unknown */
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skb->dev = dev;
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skb->mac.raw = skb->data;
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skb->pkt_type = PACKET_OTHERHOST;
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skb->protocol = __constant_htons(ETH_P_80211_RAW);
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memset(skb->cb, 0, sizeof(skb->cb));
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/* Pass up to Linux network stack */
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netif_rx_ni(skb);
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dev->last_rx = jiffies;
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/* Bump the rx stats */
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priv->stats.rx_packets++;
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priv->stats.rx_bytes += ind_data_len;
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} /* netrx_prism() */
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#endif /* PRISM */
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/*
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* ---------------------------------------------------------------------------
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* ma_sniffdata_ind
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*
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* Reformat a UniFi SNIFFDATA signal into a network
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*
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* Arguments:
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* ospriv OS private context pointer.
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* ind Pointer to a MA_UNITDATA_INDICATION or
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* DS_UNITDATA_INDICATION indication structure.
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* bulkdata Pointer to a bulk data structure, describing
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* the data received.
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*
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* Notes:
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* Radiotap header values are all little-endian, UniFi signals will have
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* been converted to host-endian.
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* ---------------------------------------------------------------------------
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*/
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void
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ma_sniffdata_ind(void *ospriv,
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const CSR_MA_SNIFFDATA_INDICATION *ind,
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const bulk_data_param_t *bulkdata)
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{
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unifi_priv_t *priv = ospriv;
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struct net_device *dev = priv->netdev;
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struct sk_buff *skb = (struct sk_buff*)bulkdata->d[0].os_net_buf_ptr;
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if (bulkdata->d[0].data_length == 0) {
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unifi_warning(priv, "rx: MA-SNIFFDATA indication with zero bulk data\n");
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return;
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}
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skb->len = bulkdata->d[0].data_length;
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/* We only process data packets if the interface is open */
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if (unlikely(!netif_running(dev))) {
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priv->stats.rx_dropped++;
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priv->wext_conf.wireless_stats.discard.misc++;
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dev_kfree_skb(skb);
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return;
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}
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if (ind->ReceptionStatus) {
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priv->stats.rx_dropped++;
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priv->wext_conf.wireless_stats.discard.misc++;
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printk(KERN_INFO "unifi: Dropping corrupt sniff packet\n");
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dev_kfree_skb(skb);
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return;
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}
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#if (UNIFI_SNIFF_ARPHRD == ARPHRD_IEEE80211_PRISM)
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netrx_prism(priv, ind, skb);
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#endif /* PRISM */
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#if (UNIFI_SNIFF_ARPHRD == ARPHRD_IEEE80211_RADIOTAP)
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netrx_radiotap(priv, ind, skb);
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#endif /* RADIOTAP */
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dev_kfree_skb(skb);
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} /* ma_sniffdata_ind() */
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#endif /* UNIFI_SNIFF_ARPHRD */
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