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18682f3d29
madwifi/net80211/ieee80211_monitor.c
mentor 18682f3d29 SKB handling code cleanup: 
* Convert last SKB_CB()->ni to SKB_NI
 * Lots of comments
 * Refactor various pieces of code for consistency, readability, and removal of goto


git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3666 0192ed92-7a03-0410-a25b-9323aeb14dbd
2008-05-22 12:58:24 +00:00

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/*-
* Copyright (c) 2005 John Bicket
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id$
*/
#ifndef EXPORT_SYMTAB
#define EXPORT_SYMTAB
#endif
/*
* IEEE 802.11 monitor mode
*/
#ifndef AUTOCONF_INCLUDED
#include <linux/config.h>
#endif
#include <linux/version.h>
#include <linux/module.h>
#include <linux/kmod.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/sysctl.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_vlan.h>
#include <net/iw_handler.h>
#include <linux/wireless.h>
#include <linux/if_arp.h> /* for ARPHRD_* */
#include <asm/uaccess.h>
#include "if_media.h"
#include "if_ethersubr.h"
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_monitor.h>
#include <ath/if_athvar.h>
static int
ratecode_to_dot11(int ratecode)
{
switch (ratecode) {
/* a */
case 0x0b: return 12;
case 0x0f: return 18;
case 0x0a: return 24;
case 0x0e: return 36;
case 0x09: return 48;
case 0x0d: return 72;
case 0x08: return 96;
case 0x0c: return 108;
case 0x1b: return 2;
case 0x1a: return 4;
case 0x1e: return 4;
case 0x19: return 11;
case 0x1d: return 11;
case 0x18: return 22;
case 0x1c: return 22;
}
return 0;
}
struct ar5212_openbsd_desc {
/*
* tx_control_0
*/
u_int32_t frame_len:12;
u_int32_t reserved_12_15:4;
u_int32_t xmit_power:6;
u_int32_t rts_cts_enable:1;
u_int32_t veol:1;
u_int32_t clear_dest_mask:1;
u_int32_t ant_mode_xmit:4;
u_int32_t inter_req:1;
u_int32_t encrypt_key_valid:1;
u_int32_t cts_enable:1;
u_int32_t r1;
/*
* tx_control_2
*/
u_int32_t rts_duration:15;
u_int32_t duration_update_enable:1;
u_int32_t xmit_tries0:4;
u_int32_t xmit_tries1:4;
u_int32_t xmit_tries2:4;
u_int32_t xmit_tries3:4;
/*
* tx_control_3
*/
u_int32_t xmit_rate0:5;
u_int32_t xmit_rate1:5;
u_int32_t xmit_rate2:5;
u_int32_t xmit_rate3:5;
u_int32_t rts_cts_rate:5;
u_int32_t reserved_25_31:7;
};
void
ieee80211_monitor_encap(struct ieee80211vap *vap, struct sk_buff *skb)
{
struct ieee80211_phy_params *ph = &(SKB_CB(skb)->phy);
SKB_CB(skb)->flags = M_RAW;
SKB_NI(skb) = NULL;
/* send at a static rate if it is configured */
ph->rate[0] = vap->iv_fixed_rate > 0 ? vap->iv_fixed_rate : 2;
/* don't retry control packets */
ph->try[0] = 11;
ph->power = 60;
switch (skb->dev->type) {
case ARPHRD_IEEE80211: {
struct ieee80211_frame *wh = (struct ieee80211_frame *) skb->data;
if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL)
ph->try[0] = 1;
break;
}
case ARPHRD_IEEE80211_PRISM: {
struct ieee80211_frame *wh = NULL;
struct wlan_ng_prism2_header *p2h =
(struct wlan_ng_prism2_header *) skb->data;
/* does it look like there is a prism header here? */
if (skb->len > sizeof(struct wlan_ng_prism2_header) &&
p2h->msgcode == DIDmsg_lnxind_wlansniffrm &&
p2h->rate.did == DIDmsg_lnxind_wlansniffrm_rate) {
ph->rate[0] = p2h->rate.data;
skb_pull(skb, sizeof(struct wlan_ng_prism2_header));
}
wh = (struct ieee80211_frame *) skb->data;
if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL)
ph->try[0] = 1;
break;
}
case ARPHRD_IEEE80211_RADIOTAP: {
struct ieee80211_frame *wh = NULL;
struct ieee80211_radiotap_header *rh =
(struct ieee80211_radiotap_header *)skb->data;
u_int32_t present, present_ext;
u_int16_t len;
u_int8_t *start = skb->data + sizeof(struct ieee80211_radiotap_header);
u_int8_t *p = start;
u_int8_t *end = skb->data + skb->len;
u_int8_t bit, flags = 0;
if (skb->len < sizeof(*rh) || rh->it_version != 0)
break;
present_ext = present = le32_to_cpu(rh->it_present);
len = le16_to_cpu(rh->it_len);
if (skb->len < len)
break;
/* skip the chain of additional bitmaps following it_present */
while (present_ext & (1 << IEEE80211_RADIOTAP_EXT)) {
if (p+4 > end) {
/* An extended bitmap would now follow, but there is
* no place for it. Stop parsing. */
present = 0;
break;
}
present_ext = le32_to_cpu(*(__le32 *)p);
p += 4;
}
for (bit = 0; present && p < end; present >>= 1, bit++) {
if ((present & 1) == 0)
continue;
switch (bit) {
case IEEE80211_RADIOTAP_RATE:
ph->rate[0] = *p;
p++;
break;
case IEEE80211_RADIOTAP_DBM_TX_POWER:
ph->power = *p;
p++;
break;
case IEEE80211_RADIOTAP_FLAGS:
flags = *p;
p++;
break;
case IEEE80211_RADIOTAP_DB_ANTSIGNAL:
case IEEE80211_RADIOTAP_DB_ANTNOISE:
case IEEE80211_RADIOTAP_ANTENNA:
case IEEE80211_RADIOTAP_DBM_ANTSIGNAL:
case IEEE80211_RADIOTAP_DBM_ANTNOISE:
/* 8-bit */
p++;
break;
case IEEE80211_RADIOTAP_FHSS:
/* 2 x 8-bit */
p += 2;
break;
case IEEE80211_RADIOTAP_LOCK_QUALITY:
case IEEE80211_RADIOTAP_TX_ATTENUATION:
case IEEE80211_RADIOTAP_DB_TX_ATTENUATION:
/* 16-bit */
p = start + roundup(p - start, 2) + 2;
break;
case IEEE80211_RADIOTAP_CHANNEL:
/* 2 x 16-bit */
p = start + roundup(p - start, 2) + 4;
break;
case IEEE80211_RADIOTAP_TSFT:
/* 64-bit */
p = start + roundup(p - start, 8) + 8;
break;
case IEEE80211_RADIOTAP_DATA_RETRIES:
ph->try[0] = *p + 1;
p++;
break;
default:
present = 0;
break;
}
}
skb_pull(skb, len);
if (flags & IEEE80211_RADIOTAP_F_FCS)
/* Remove FCS from the end of frames to transmit */
skb_trim(skb, skb->len - IEEE80211_CRC_LEN);
wh = (struct ieee80211_frame *)skb->data;
if (!ph->try[0] &&
(wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL)
ph->try[0] = 1;
break;
}
case ARPHRD_IEEE80211_ATHDESC: {
if (skb->len > ATHDESC_HEADER_SIZE) {
struct ar5212_openbsd_desc *desc =
(struct ar5212_openbsd_desc *) (skb->data + 8);
ph->power = desc->xmit_power;
ph->rate[0] = ratecode_to_dot11(desc->xmit_rate0);
ph->rate[1] = ratecode_to_dot11(desc->xmit_rate1);
ph->rate[2] = ratecode_to_dot11(desc->xmit_rate2);
ph->rate[3] = ratecode_to_dot11(desc->xmit_rate3);
ph->try[0] = desc->xmit_tries0;
ph->try[1] = desc->xmit_tries1;
ph->try[2] = desc->xmit_tries2;
ph->try[3] = desc->xmit_tries3;
skb_pull(skb, ATHDESC_HEADER_SIZE);
}
break;
}
default:
break;
}
if (!ph->rate[0]) {
ph->rate[0] = 0;
ph->try[0] = 11;
}
}
EXPORT_SYMBOL(ieee80211_monitor_encap);
/*
* Context: softIRQ (tasklet)
*/
void
ieee80211_input_monitor(struct ieee80211com *ic, struct sk_buff *skb,
const struct ath_buf *bf, int tx, u_int64_t mactime, struct ath_softc *sc)
{
struct ieee80211vap *vap, *next;
struct ath_desc *ds = bf->bf_desc;
int noise = 0, antenna = 0, ieeerate = 0;
u_int32_t rssi = 0;
u_int8_t pkttype = 0;
if (tx) {
rssi = bf->bf_dsstatus.ds_txstat.ts_rssi;
antenna = bf->bf_dsstatus.ds_txstat.ts_antenna;
ieeerate = sc->sc_hwmap[bf->bf_dsstatus.ds_txstat.ts_rate].ieeerate;
} else {
rssi = bf->bf_dsstatus.ds_rxstat.rs_rssi;
antenna = bf->bf_dsstatus.ds_rxstat.rs_antenna;
ieeerate = sc->sc_hwmap[bf->bf_dsstatus.ds_rxstat.rs_rate].ieeerate;
}
noise = bf->bf_channoise;
/* XXX locking */
for (vap = TAILQ_FIRST(&ic->ic_vaps); vap != NULL; vap = next) {
struct sk_buff *skb1;
struct net_device *dev = vap->iv_dev;
struct ieee80211_frame *wh = (struct ieee80211_frame *)skb->data;
u_int8_t dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
next = TAILQ_NEXT(vap, iv_next);
/* If we have rx'd an error frame... */
if (!tx && bf->bf_dsstatus.ds_rxstat.rs_status != 0) {
/* Discard PHY errors if necessary */
if (bf->bf_dsstatus.ds_rxstat.rs_status & HAL_RXERR_PHY) {
if (vap->iv_monitor_phy_errors == 0) continue;
}
/* Discard CRC errors if necessary */
if (bf->bf_dsstatus.ds_rxstat.rs_status & HAL_RXERR_CRC) {
if (vap->iv_monitor_crc_errors == 0) continue;
}
/* Accept PHY, CRC and decrypt errors. Discard the rest. */
if (bf->bf_dsstatus.ds_rxstat.rs_status &~
(HAL_RXERR_DECRYPT | HAL_RXERR_MIC |
HAL_RXERR_PHY | HAL_RXERR_CRC))
continue;
/* We can't use addr1 to determine direction at this point */
pkttype = PACKET_HOST;
} else {
/*
* The frame passed its CRC, so we can rely
* on the contents of the frame to set pkttype.
*/
if (tx)
pkttype = PACKET_OUTGOING;
else if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
if (IEEE80211_ADDR_EQ(wh->i_addr1, dev->broadcast))
pkttype = PACKET_BROADCAST;
else
pkttype = PACKET_MULTICAST;
} else
pkttype = PACKET_HOST;
}
if (vap->iv_opmode != IEEE80211_M_MONITOR ||
vap->iv_state != IEEE80211_S_RUN)
continue;
if (vap->iv_monitor_nods_only &&
dir != IEEE80211_FC1_DIR_NODS) {
/* don't rx fromds, tods, or dstods packets */
continue;
}
if (skb_headroom(skb) < IEEE80211_MON_MAXHDROOM)
skb1 = skb_copy_expand(skb, IEEE80211_MON_MAXHDROOM,
0, GFP_ATOMIC);
else
skb1 = skb_copy(skb, GFP_ATOMIC);
if (skb1 == NULL) {
/* XXX stat+msg */
continue;
}
ieee80211_skb_copy_noderef(skb, skb1);
if (vap->iv_monitor_txf_len && tx) {
/* truncate transmit feedback packets */
skb_trim(skb1, vap->iv_monitor_txf_len);
skb_reset_network_header(skb1);
}
switch (vap->iv_dev->type) {
case ARPHRD_IEEE80211:
break;
case ARPHRD_IEEE80211_PRISM: {
struct wlan_ng_prism2_header *ph;
if (skb_headroom(skb1) < sizeof(struct wlan_ng_prism2_header)) {
ieee80211_dev_kfree_skb(&skb1);
break;
}
ph = (struct wlan_ng_prism2_header *)
skb_push(skb1, sizeof(struct wlan_ng_prism2_header));
memset(ph, 0, sizeof(struct wlan_ng_prism2_header));
ph->msgcode = DIDmsg_lnxind_wlansniffrm;
ph->msglen = sizeof(struct wlan_ng_prism2_header);
strncpy(ph->devname, dev->name, sizeof(ph->devname));
ph->hosttime.did = DIDmsg_lnxind_wlansniffrm_hosttime;
ph->hosttime.status = 0;
ph->hosttime.len = 4;
ph->hosttime.data = jiffies;
/* Pass up tsf clock in mactime */
/* NB: the prism mactime field is 32bit, so we lose TSF precision here */
ph->mactime.did = DIDmsg_lnxind_wlansniffrm_mactime;
ph->mactime.status = 0;
ph->mactime.len = 4;
ph->mactime.data = mactime;
ph->istx.did = DIDmsg_lnxind_wlansniffrm_istx;
ph->istx.status = 0;
ph->istx.len = 4;
ph->istx.data = tx ? P80211ENUM_truth_true : P80211ENUM_truth_false;
ph->frmlen.did = DIDmsg_lnxind_wlansniffrm_frmlen;
ph->frmlen.status = 0;
ph->frmlen.len = 4;
ph->frmlen.data = skb->len;
ph->channel.did = DIDmsg_lnxind_wlansniffrm_channel;
ph->channel.status = 0;
ph->channel.len = 4;
ph->channel.data =
ieee80211_mhz2ieee(ic->ic_curchan->ic_freq,
ic->ic_curchan->ic_flags);
ph->rssi.did = DIDmsg_lnxind_wlansniffrm_rssi;
ph->rssi.status = 0;
ph->rssi.len = 4;
ph->rssi.data = rssi;
ph->noise.did = DIDmsg_lnxind_wlansniffrm_noise;
ph->noise.status = 0;
ph->noise.len = 4;
ph->noise.data = noise;
ph->signal.did = DIDmsg_lnxind_wlansniffrm_signal;
ph->signal.status = 0;
ph->signal.len = 4;
ph->signal.data = rssi + noise;
ph->rate.did = DIDmsg_lnxind_wlansniffrm_rate;
ph->rate.status = 0;
ph->rate.len = 4;
ph->rate.data = ieeerate;
break;
}
case ARPHRD_IEEE80211_RADIOTAP: {
if (tx) {
struct ath_tx_radiotap_header *th;
if (skb_headroom(skb1) < sizeof(struct ath_tx_radiotap_header)) {
printk("%s:%d %s\n", __FILE__, __LINE__, __func__);
ieee80211_dev_kfree_skb(&skb1);
break;
}
th = (struct ath_tx_radiotap_header *) skb_push(skb1,
sizeof(struct ath_tx_radiotap_header));
memset(th, 0, sizeof(struct ath_tx_radiotap_header));
th->wt_ihdr.it_version = 0;
th->wt_ihdr.it_len = cpu_to_le16(sizeof(struct ath_tx_radiotap_header));
th->wt_ihdr.it_present = cpu_to_le32(ATH_TX_RADIOTAP_PRESENT);
/* radiotap's TSF field is the full 64 bits, so we don't lose
* any TSF precision when using radiotap */
th->wt_tsft = cpu_to_le64(mactime);
th->wt_flags = 0;
th->wt_rate = ieeerate;
th->wt_antenna = antenna;
th->wt_pad = 0;
if (bf->bf_dsstatus.ds_txstat.ts_status & HAL_TXERR_XRETRY)
th->wt_txflags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
th->wt_dataretries = bf->bf_dsstatus.ds_txstat.ts_shortretry + bf->bf_dsstatus.ds_txstat.ts_longretry;
} else {
struct ath_rx_radiotap_header *th;
if (skb_headroom(skb1) < sizeof(struct ath_rx_radiotap_header)) {
printk("%s:%d %s\n", __FILE__, __LINE__, __func__);
ieee80211_dev_kfree_skb(&skb1);
break;
}
th = (struct ath_rx_radiotap_header *) skb_push(skb1,
sizeof(struct ath_rx_radiotap_header));
memset(th, 0, sizeof(struct ath_rx_radiotap_header));
th->wr_ihdr.it_version = 0;
th->wr_ihdr.it_len = cpu_to_le16(sizeof(struct ath_rx_radiotap_header));
th->wr_ihdr.it_present = cpu_to_le32(ATH_RX_RADIOTAP_PRESENT);
if (ic->ic_flags & IEEE80211_F_SHPREAMBLE)
th->wr_flags |= IEEE80211_RADIOTAP_F_SHORTPRE;
if (bf->bf_dsstatus.ds_rxstat.rs_status & HAL_RXERR_CRC)
th->wr_flags |= IEEE80211_RADIOTAP_F_BADFCS;
if (skb->len >= IEEE80211_CRC_LEN)
th->wr_flags |= IEEE80211_RADIOTAP_F_FCS;
th->wr_rate = ieeerate;
th->wr_chan_freq = cpu_to_le16(ic->ic_curchan->ic_freq);
/* Define the channel flags for radiotap */
switch (sc->sc_curmode) {
case IEEE80211_MODE_11A:
th->wr_chan_flags =
cpu_to_le16(IEEE80211_CHAN_A);
break;
case IEEE80211_MODE_TURBO_A:
th->wr_chan_flags =
cpu_to_le16(IEEE80211_CHAN_TA);
break;
case IEEE80211_MODE_11B:
th->wr_chan_flags =
cpu_to_le16(IEEE80211_CHAN_B);
break;
case IEEE80211_MODE_11G:
th->wr_chan_flags =
cpu_to_le16(IEEE80211_CHAN_G);
break;
case IEEE80211_MODE_TURBO_G:
th->wr_chan_flags =
cpu_to_le16(IEEE80211_CHAN_TG);
break;
default:
th->wr_chan_flags = 0; /* unknown */
break;
}
th->wr_dbm_antnoise = (int8_t) noise;
th->wr_dbm_antsignal =
th->wr_dbm_antnoise + rssi;
th->wr_antenna = antenna;
th->wr_antsignal = rssi;
th->wr_tsft = cpu_to_le64(mactime);
}
break;
}
case ARPHRD_IEEE80211_ATHDESC: {
if (skb_headroom(skb1) < ATHDESC_HEADER_SIZE) {
printk("%s:%d %s\n", __FILE__,
__LINE__, __func__);
ieee80211_dev_kfree_skb(&skb1);
break;
}
memcpy(skb_push(skb1, ATHDESC_HEADER_SIZE),
ds, ATHDESC_HEADER_SIZE);
break;
}
default:
break;
}
if (skb1 != NULL) {
if (!tx && (skb1->len >= IEEE80211_CRC_LEN) &&
(vap->iv_dev->type !=
ARPHRD_IEEE80211_RADIOTAP)) {
/* Remove FCS from end of RX frames when
* delivering to non-Radiotap VAPs. */
skb_trim(skb1, skb1->len - IEEE80211_CRC_LEN);
}
skb1->dev = dev; /* NB: deliver to wlanX */
skb_reset_mac_header(skb1);
skb1->ip_summed = CHECKSUM_NONE;
skb1->pkt_type = pkttype;
skb1->protocol =
__constant_htons(0x0019); /* ETH_P_80211_RAW */
if (netif_rx(skb1) == NET_RX_DROP) {
/* If netif_rx dropped the packet because
* device was too busy, reclaim the ref. in
* the skb. */
if (SKB_NI(skb1) != NULL)
ieee80211_unref_node(&SKB_NI(skb1));
vap->iv_devstats.rx_dropped++;
}
vap->iv_devstats.rx_packets++;
vap->iv_devstats.rx_bytes += skb1->len;
}
}
}
EXPORT_SYMBOL(ieee80211_input_monitor);
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