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kernel-fxtec-pro1x/drivers/net/wireless/orinoco/main.c
Santosh Nayak e90c7e7129 net: orinoco: add error handling for failed kmalloc(). 
With flag 'GFP_ATOMIC', probability of allocation failure is more.
Add error handling after kmalloc() call to avoid null dereference.

Signed-off-by: Santosh Nayak <santoshprasadnayak@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2012-03-28 14:25:35 -04:00

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/* main.c - (formerly known as dldwd_cs.c, orinoco_cs.c and orinoco.c)
*
* A driver for Hermes or Prism 2 chipset based PCMCIA wireless
* adaptors, with Lucent/Agere, Intersil or Symbol firmware.
*
* Current maintainers (as of 29 September 2003) are:
* Pavel Roskin <proski AT gnu.org>
* and David Gibson <hermes AT gibson.dropbear.id.au>
*
* (C) Copyright David Gibson, IBM Corporation 2001-2003.
* Copyright (C) 2000 David Gibson, Linuxcare Australia.
* With some help from :
* Copyright (C) 2001 Jean Tourrilhes, HP Labs
* Copyright (C) 2001 Benjamin Herrenschmidt
*
* Based on dummy_cs.c 1.27 2000/06/12 21:27:25
*
* Portions based on wvlan_cs.c 1.0.6, Copyright Andreas Neuhaus <andy
* AT fasta.fh-dortmund.de>
* http://www.stud.fh-dortmund.de/~andy/wvlan/
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License
* at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and
* limitations under the License.
*
* The initial developer of the original code is David A. Hinds
* <dahinds AT users.sourceforge.net>. Portions created by David
* A. Hinds are Copyright (C) 1999 David A. Hinds. All Rights
* Reserved.
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License version 2 (the "GPL"), in
* which case the provisions of the GPL are applicable instead of the
* above. If you wish to allow the use of your version of this file
* only under the terms of the GPL and not to allow others to use your
* version of this file under the MPL, indicate your decision by
* deleting the provisions above and replace them with the notice and
* other provisions required by the GPL. If you do not delete the
* provisions above, a recipient may use your version of this file
* under either the MPL or the GPL. */
/*
* TODO
* o Handle de-encapsulation within network layer, provide 802.11
* headers (patch from Thomas 'Dent' Mirlacher)
* o Fix possible races in SPY handling.
* o Disconnect wireless extensions from fundamental configuration.
* o (maybe) Software WEP support (patch from Stano Meduna).
* o (maybe) Use multiple Tx buffers - driver handling queue
* rather than firmware.
*/
/* Locking and synchronization:
*
* The basic principle is that everything is serialized through a
* single spinlock, priv->lock. The lock is used in user, bh and irq
* context, so when taken outside hardirq context it should always be
* taken with interrupts disabled. The lock protects both the
* hardware and the struct orinoco_private.
*
* Another flag, priv->hw_unavailable indicates that the hardware is
* unavailable for an extended period of time (e.g. suspended, or in
* the middle of a hard reset). This flag is protected by the
* spinlock. All code which touches the hardware should check the
* flag after taking the lock, and if it is set, give up on whatever
* they are doing and drop the lock again. The orinoco_lock()
* function handles this (it unlocks and returns -EBUSY if
* hw_unavailable is non-zero).
*/
#define DRIVER_NAME "orinoco"
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/suspend.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/ieee80211.h>
#include <net/iw_handler.h>
#include <net/cfg80211.h>
#include "hermes_rid.h"
#include "hermes_dld.h"
#include "hw.h"
#include "scan.h"
#include "mic.h"
#include "fw.h"
#include "wext.h"
#include "cfg.h"
#include "main.h"
#include "orinoco.h"
/********************************************************************/
/* Module information */
/********************************************************************/
MODULE_AUTHOR("Pavel Roskin <proski@gnu.org> & "
"David Gibson <hermes@gibson.dropbear.id.au>");
MODULE_DESCRIPTION("Driver for Lucent Orinoco, Prism II based "
"and similar wireless cards");
MODULE_LICENSE("Dual MPL/GPL");
/* Level of debugging. Used in the macros in orinoco.h */
#ifdef ORINOCO_DEBUG
int orinoco_debug = ORINOCO_DEBUG;
EXPORT_SYMBOL(orinoco_debug);
module_param(orinoco_debug, int, 0644);
MODULE_PARM_DESC(orinoco_debug, "Debug level");
#endif
static bool suppress_linkstatus; /* = 0 */
module_param(suppress_linkstatus, bool, 0644);
MODULE_PARM_DESC(suppress_linkstatus, "Don't log link status changes");
static int ignore_disconnect; /* = 0 */
module_param(ignore_disconnect, int, 0644);
MODULE_PARM_DESC(ignore_disconnect,
"Don't report lost link to the network layer");
int force_monitor; /* = 0 */
module_param(force_monitor, int, 0644);
MODULE_PARM_DESC(force_monitor, "Allow monitor mode for all firmware versions");
/********************************************************************/
/* Internal constants */
/********************************************************************/
/* 802.2 LLC/SNAP header used for Ethernet encapsulation over 802.11 */
static const u8 encaps_hdr[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
#define ENCAPS_OVERHEAD (sizeof(encaps_hdr) + 2)
#define ORINOCO_MIN_MTU 256
#define ORINOCO_MAX_MTU (IEEE80211_MAX_DATA_LEN - ENCAPS_OVERHEAD)
#define MAX_IRQLOOPS_PER_IRQ 10
#define MAX_IRQLOOPS_PER_JIFFY (20000 / HZ) /* Based on a guestimate of
* how many events the
* device could
* legitimately generate */
#define DUMMY_FID 0xFFFF
/*#define MAX_MULTICAST(priv) (priv->firmware_type == FIRMWARE_TYPE_AGERE ? \
HERMES_MAX_MULTICAST : 0)*/
#define MAX_MULTICAST(priv) (HERMES_MAX_MULTICAST)
#define ORINOCO_INTEN (HERMES_EV_RX | HERMES_EV_ALLOC \
| HERMES_EV_TX | HERMES_EV_TXEXC \
| HERMES_EV_WTERR | HERMES_EV_INFO \
| HERMES_EV_INFDROP)
/********************************************************************/
/* Data types */
/********************************************************************/
/* Beginning of the Tx descriptor, used in TxExc handling */
struct hermes_txexc_data {
struct hermes_tx_descriptor desc;
__le16 frame_ctl;
__le16 duration_id;
u8 addr1[ETH_ALEN];
} __packed;
/* Rx frame header except compatibility 802.3 header */
struct hermes_rx_descriptor {
/* Control */
__le16 status;
__le32 time;
u8 silence;
u8 signal;
u8 rate;
u8 rxflow;
__le32 reserved;
/* 802.11 header */
__le16 frame_ctl;
__le16 duration_id;
u8 addr1[ETH_ALEN];
u8 addr2[ETH_ALEN];
u8 addr3[ETH_ALEN];
__le16 seq_ctl;
u8 addr4[ETH_ALEN];
/* Data length */
__le16 data_len;
} __packed;
struct orinoco_rx_data {
struct hermes_rx_descriptor *desc;
struct sk_buff *skb;
struct list_head list;
};
struct orinoco_scan_data {
void *buf;
size_t len;
int type;
struct list_head list;
};
/********************************************************************/
/* Function prototypes */
/********************************************************************/
static int __orinoco_set_multicast_list(struct net_device *dev);
static int __orinoco_up(struct orinoco_private *priv);
static int __orinoco_down(struct orinoco_private *priv);
static int __orinoco_commit(struct orinoco_private *priv);
/********************************************************************/
/* Internal helper functions */
/********************************************************************/
void set_port_type(struct orinoco_private *priv)
{
switch (priv->iw_mode) {
case NL80211_IFTYPE_STATION:
priv->port_type = 1;
priv->createibss = 0;
break;
case NL80211_IFTYPE_ADHOC:
if (priv->prefer_port3) {
priv->port_type = 3;
priv->createibss = 0;
} else {
priv->port_type = priv->ibss_port;
priv->createibss = 1;
}
break;
case NL80211_IFTYPE_MONITOR:
priv->port_type = 3;
priv->createibss = 0;
break;
default:
printk(KERN_ERR "%s: Invalid priv->iw_mode in set_port_type()\n",
priv->ndev->name);
}
}
/********************************************************************/
/* Device methods */
/********************************************************************/
int orinoco_open(struct net_device *dev)
{
struct orinoco_private *priv = ndev_priv(dev);
unsigned long flags;
int err;
if (orinoco_lock(priv, &flags) != 0)
return -EBUSY;
err = __orinoco_up(priv);
if (!err)
priv->open = 1;
orinoco_unlock(priv, &flags);
return err;
}
EXPORT_SYMBOL(orinoco_open);
int orinoco_stop(struct net_device *dev)
{
struct orinoco_private *priv = ndev_priv(dev);
int err = 0;
/* We mustn't use orinoco_lock() here, because we need to be
able to close the interface even if hw_unavailable is set
(e.g. as we're released after a PC Card removal) */
orinoco_lock_irq(priv);
priv->open = 0;
err = __orinoco_down(priv);
orinoco_unlock_irq(priv);
return err;
}
EXPORT_SYMBOL(orinoco_stop);
struct net_device_stats *orinoco_get_stats(struct net_device *dev)
{
struct orinoco_private *priv = ndev_priv(dev);
return &priv->stats;
}
EXPORT_SYMBOL(orinoco_get_stats);
void orinoco_set_multicast_list(struct net_device *dev)
{
struct orinoco_private *priv = ndev_priv(dev);
unsigned long flags;
if (orinoco_lock(priv, &flags) != 0) {
printk(KERN_DEBUG "%s: orinoco_set_multicast_list() "
"called when hw_unavailable\n", dev->name);
return;
}
__orinoco_set_multicast_list(dev);
orinoco_unlock(priv, &flags);
}
EXPORT_SYMBOL(orinoco_set_multicast_list);
int orinoco_change_mtu(struct net_device *dev, int new_mtu)
{
struct orinoco_private *priv = ndev_priv(dev);
if ((new_mtu < ORINOCO_MIN_MTU) || (new_mtu > ORINOCO_MAX_MTU))
return -EINVAL;
/* MTU + encapsulation + header length */
if ((new_mtu + ENCAPS_OVERHEAD + sizeof(struct ieee80211_hdr)) >
(priv->nicbuf_size - ETH_HLEN))
return -EINVAL;
dev->mtu = new_mtu;
return 0;
}
EXPORT_SYMBOL(orinoco_change_mtu);
/********************************************************************/
/* Tx path */
/********************************************************************/
/* Add encapsulation and MIC to the existing SKB.
* The main xmit routine will then send the whole lot to the card.
* Need 8 bytes headroom
* Need 8 bytes tailroom
*
* With encapsulated ethernet II frame
* --------
* 803.3 header (14 bytes)
* dst[6]
* -------- src[6]
* 803.3 header (14 bytes) len[2]
* dst[6] 803.2 header (8 bytes)
* src[6] encaps[6]
* len[2] <- leave alone -> len[2]
* -------- -------- <-- 0
* Payload Payload
* ... ...
*
* -------- --------
* MIC (8 bytes)
* --------
*
* returns 0 on success, -ENOMEM on error.
*/
int orinoco_process_xmit_skb(struct sk_buff *skb,
struct net_device *dev,
struct orinoco_private *priv,
int *tx_control,
u8 *mic_buf)
{
struct orinoco_tkip_key *key;
struct ethhdr *eh;
int do_mic;
key = (struct orinoco_tkip_key *) priv->keys[priv->tx_key].key;
do_mic = ((priv->encode_alg == ORINOCO_ALG_TKIP) &&
(key != NULL));
if (do_mic)
*tx_control |= (priv->tx_key << HERMES_MIC_KEY_ID_SHIFT) |
HERMES_TXCTRL_MIC;
eh = (struct ethhdr *)skb->data;
/* Encapsulate Ethernet-II frames */
if (ntohs(eh->h_proto) > ETH_DATA_LEN) { /* Ethernet-II frame */
struct header_struct {
struct ethhdr eth; /* 802.3 header */
u8 encap[6]; /* 802.2 header */
} __packed hdr;
int len = skb->len + sizeof(encaps_hdr) - (2 * ETH_ALEN);
if (skb_headroom(skb) < ENCAPS_OVERHEAD) {
if (net_ratelimit())
printk(KERN_ERR
"%s: Not enough headroom for 802.2 headers %d\n",
dev->name, skb_headroom(skb));
return -ENOMEM;
}
/* Fill in new header */
memcpy(&hdr.eth, eh, 2 * ETH_ALEN);
hdr.eth.h_proto = htons(len);
memcpy(hdr.encap, encaps_hdr, sizeof(encaps_hdr));
/* Make room for the new header, and copy it in */
eh = (struct ethhdr *) skb_push(skb, ENCAPS_OVERHEAD);
memcpy(eh, &hdr, sizeof(hdr));
}
/* Calculate Michael MIC */
if (do_mic) {
size_t len = skb->len - ETH_HLEN;
u8 *mic = &mic_buf[0];
/* Have to write to an even address, so copy the spare
* byte across */
if (skb->len % 2) {
*mic = skb->data[skb->len - 1];
mic++;
}
orinoco_mic(priv->tx_tfm_mic, key->tx_mic,
eh->h_dest, eh->h_source, 0 /* priority */,
skb->data + ETH_HLEN,
len, mic);
}
return 0;
}
EXPORT_SYMBOL(orinoco_process_xmit_skb);
static netdev_tx_t orinoco_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
struct hermes *hw = &priv->hw;
int err = 0;
u16 txfid = priv->txfid;
int tx_control;
unsigned long flags;
u8 mic_buf[MICHAEL_MIC_LEN + 1];
if (!netif_running(dev)) {
printk(KERN_ERR "%s: Tx on stopped device!\n",
dev->name);
return NETDEV_TX_BUSY;
}
if (netif_queue_stopped(dev)) {
printk(KERN_DEBUG "%s: Tx while transmitter busy!\n",
dev->name);
return NETDEV_TX_BUSY;
}
if (orinoco_lock(priv, &flags) != 0) {
printk(KERN_ERR "%s: orinoco_xmit() called while hw_unavailable\n",
dev->name);
return NETDEV_TX_BUSY;
}
if (!netif_carrier_ok(dev) ||
(priv->iw_mode == NL80211_IFTYPE_MONITOR)) {
/* Oops, the firmware hasn't established a connection,
silently drop the packet (this seems to be the
safest approach). */
goto drop;
}
/* Check packet length */
if (skb->len < ETH_HLEN)
goto drop;
tx_control = HERMES_TXCTRL_TX_OK | HERMES_TXCTRL_TX_EX;
err = orinoco_process_xmit_skb(skb, dev, priv, &tx_control,
&mic_buf[0]);
if (err)
goto drop;
if (priv->has_alt_txcntl) {
/* WPA enabled firmwares have tx_cntl at the end of
* the 802.11 header. So write zeroed descriptor and
* 802.11 header at the same time
*/
char desc[HERMES_802_3_OFFSET];
__le16 *txcntl = (__le16 *) &desc[HERMES_TXCNTL2_OFFSET];
memset(&desc, 0, sizeof(desc));
*txcntl = cpu_to_le16(tx_control);
err = hw->ops->bap_pwrite(hw, USER_BAP, &desc, sizeof(desc),
txfid, 0);
if (err) {
if (net_ratelimit())
printk(KERN_ERR "%s: Error %d writing Tx "
"descriptor to BAP\n", dev->name, err);
goto busy;
}
} else {
struct hermes_tx_descriptor desc;
memset(&desc, 0, sizeof(desc));
desc.tx_control = cpu_to_le16(tx_control);
err = hw->ops->bap_pwrite(hw, USER_BAP, &desc, sizeof(desc),
txfid, 0);
if (err) {
if (net_ratelimit())
printk(KERN_ERR "%s: Error %d writing Tx "
"descriptor to BAP\n", dev->name, err);
goto busy;
}
/* Clear the 802.11 header and data length fields - some
* firmwares (e.g. Lucent/Agere 8.xx) appear to get confused
* if this isn't done. */
hermes_clear_words(hw, HERMES_DATA0,
HERMES_802_3_OFFSET - HERMES_802_11_OFFSET);
}
err = hw->ops->bap_pwrite(hw, USER_BAP, skb->data, skb->len,
txfid, HERMES_802_3_OFFSET);
if (err) {
printk(KERN_ERR "%s: Error %d writing packet to BAP\n",
dev->name, err);
goto busy;
}
if (tx_control & HERMES_TXCTRL_MIC) {
size_t offset = HERMES_802_3_OFFSET + skb->len;
size_t len = MICHAEL_MIC_LEN;
if (offset % 2) {
offset--;
len++;
}
err = hw->ops->bap_pwrite(hw, USER_BAP, &mic_buf[0], len,
txfid, offset);
if (err) {
printk(KERN_ERR "%s: Error %d writing MIC to BAP\n",
dev->name, err);
goto busy;
}
}
/* Finally, we actually initiate the send */
netif_stop_queue(dev);
err = hw->ops->cmd_wait(hw, HERMES_CMD_TX | HERMES_CMD_RECL,
txfid, NULL);
if (err) {
netif_start_queue(dev);
if (net_ratelimit())
printk(KERN_ERR "%s: Error %d transmitting packet\n",
dev->name, err);
goto busy;
}
stats->tx_bytes += HERMES_802_3_OFFSET + skb->len;
goto ok;
drop:
stats->tx_errors++;
stats->tx_dropped++;
ok:
orinoco_unlock(priv, &flags);
dev_kfree_skb(skb);
return NETDEV_TX_OK;
busy:
if (err == -EIO)
schedule_work(&priv->reset_work);
orinoco_unlock(priv, &flags);
return NETDEV_TX_BUSY;
}
static void __orinoco_ev_alloc(struct net_device *dev, struct hermes *hw)
{
struct orinoco_private *priv = ndev_priv(dev);
u16 fid = hermes_read_regn(hw, ALLOCFID);
if (fid != priv->txfid) {
if (fid != DUMMY_FID)
printk(KERN_WARNING "%s: Allocate event on unexpected fid (%04X)\n",
dev->name, fid);
return;
}
hermes_write_regn(hw, ALLOCFID, DUMMY_FID);
}
static void __orinoco_ev_tx(struct net_device *dev, struct hermes *hw)
{
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
stats->tx_packets++;
netif_wake_queue(dev);
hermes_write_regn(hw, TXCOMPLFID, DUMMY_FID);
}
static void __orinoco_ev_txexc(struct net_device *dev, struct hermes *hw)
{
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
u16 fid = hermes_read_regn(hw, TXCOMPLFID);
u16 status;
struct hermes_txexc_data hdr;
int err = 0;
if (fid == DUMMY_FID)
return; /* Nothing's really happened */
/* Read part of the frame header - we need status and addr1 */
err = hw->ops->bap_pread(hw, IRQ_BAP, &hdr,
sizeof(struct hermes_txexc_data),
fid, 0);
hermes_write_regn(hw, TXCOMPLFID, DUMMY_FID);
stats->tx_errors++;
if (err) {
printk(KERN_WARNING "%s: Unable to read descriptor on Tx error "
"(FID=%04X error %d)\n",
dev->name, fid, err);
return;
}
DEBUG(1, "%s: Tx error, err %d (FID=%04X)\n", dev->name,
err, fid);
/* We produce a TXDROP event only for retry or lifetime
* exceeded, because that's the only status that really mean
* that this particular node went away.
* Other errors means that *we* screwed up. - Jean II */
status = le16_to_cpu(hdr.desc.status);
if (status & (HERMES_TXSTAT_RETRYERR | HERMES_TXSTAT_AGEDERR)) {
union iwreq_data wrqu;
/* Copy 802.11 dest address.
* We use the 802.11 header because the frame may
* not be 802.3 or may be mangled...
* In Ad-Hoc mode, it will be the node address.
* In managed mode, it will be most likely the AP addr
* User space will figure out how to convert it to
* whatever it needs (IP address or else).
* - Jean II */
memcpy(wrqu.addr.sa_data, hdr.addr1, ETH_ALEN);
wrqu.addr.sa_family = ARPHRD_ETHER;
/* Send event to user space */
wireless_send_event(dev, IWEVTXDROP, &wrqu, NULL);
}
netif_wake_queue(dev);
}
void orinoco_tx_timeout(struct net_device *dev)
{
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
struct hermes *hw = &priv->hw;
printk(KERN_WARNING "%s: Tx timeout! "
"ALLOCFID=%04x, TXCOMPLFID=%04x, EVSTAT=%04x\n",
dev->name, hermes_read_regn(hw, ALLOCFID),
hermes_read_regn(hw, TXCOMPLFID), hermes_read_regn(hw, EVSTAT));
stats->tx_errors++;
schedule_work(&priv->reset_work);
}
EXPORT_SYMBOL(orinoco_tx_timeout);
/********************************************************************/
/* Rx path (data frames) */
/********************************************************************/
/* Does the frame have a SNAP header indicating it should be
* de-encapsulated to Ethernet-II? */
static inline int is_ethersnap(void *_hdr)
{
u8 *hdr = _hdr;
/* We de-encapsulate all packets which, a) have SNAP headers
* (i.e. SSAP=DSAP=0xaa and CTRL=0x3 in the 802.2 LLC header
* and where b) the OUI of the SNAP header is 00:00:00 or
* 00:00:f8 - we need both because different APs appear to use
* different OUIs for some reason */
return (memcmp(hdr, &encaps_hdr, 5) == 0)
&& ((hdr[5] == 0x00) || (hdr[5] == 0xf8));
}
static inline void orinoco_spy_gather(struct net_device *dev, u_char *mac,
int level, int noise)
{
struct iw_quality wstats;
wstats.level = level - 0x95;
wstats.noise = noise - 0x95;
wstats.qual = (level > noise) ? (level - noise) : 0;
wstats.updated = IW_QUAL_ALL_UPDATED | IW_QUAL_DBM;
/* Update spy records */
wireless_spy_update(dev, mac, &wstats);
}
static void orinoco_stat_gather(struct net_device *dev,
struct sk_buff *skb,
struct hermes_rx_descriptor *desc)
{
struct orinoco_private *priv = ndev_priv(dev);
/* Using spy support with lots of Rx packets, like in an
* infrastructure (AP), will really slow down everything, because
* the MAC address must be compared to each entry of the spy list.
* If the user really asks for it (set some address in the
* spy list), we do it, but he will pay the price.
* Note that to get here, you need both WIRELESS_SPY
* compiled in AND some addresses in the list !!!
*/
/* Note : gcc will optimise the whole section away if
* WIRELESS_SPY is not defined... - Jean II */
if (SPY_NUMBER(priv)) {
orinoco_spy_gather(dev, skb_mac_header(skb) + ETH_ALEN,
desc->signal, desc->silence);
}
}
/*
* orinoco_rx_monitor - handle received monitor frames.
*
* Arguments:
* dev network device
* rxfid received FID
* desc rx descriptor of the frame
*
* Call context: interrupt
*/
static void orinoco_rx_monitor(struct net_device *dev, u16 rxfid,
struct hermes_rx_descriptor *desc)
{
u32 hdrlen = 30; /* return full header by default */
u32 datalen = 0;
u16 fc;
int err;
int len;
struct sk_buff *skb;
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
struct hermes *hw = &priv->hw;
len = le16_to_cpu(desc->data_len);
/* Determine the size of the header and the data */
fc = le16_to_cpu(desc->frame_ctl);
switch (fc & IEEE80211_FCTL_FTYPE) {
case IEEE80211_FTYPE_DATA:
if ((fc & IEEE80211_FCTL_TODS)
&& (fc & IEEE80211_FCTL_FROMDS))
hdrlen = 30;
else
hdrlen = 24;
datalen = len;
break;
case IEEE80211_FTYPE_MGMT:
hdrlen = 24;
datalen = len;
break;
case IEEE80211_FTYPE_CTL:
switch (fc & IEEE80211_FCTL_STYPE) {
case IEEE80211_STYPE_PSPOLL:
case IEEE80211_STYPE_RTS:
case IEEE80211_STYPE_CFEND:
case IEEE80211_STYPE_CFENDACK:
hdrlen = 16;
break;
case IEEE80211_STYPE_CTS:
case IEEE80211_STYPE_ACK:
hdrlen = 10;
break;
}
break;
default:
/* Unknown frame type */
break;
}
/* sanity check the length */
if (datalen > IEEE80211_MAX_DATA_LEN + 12) {
printk(KERN_DEBUG "%s: oversized monitor frame, "
"data length = %d\n", dev->name, datalen);
stats->rx_length_errors++;
goto update_stats;
}
skb = dev_alloc_skb(hdrlen + datalen);
if (!skb) {
printk(KERN_WARNING "%s: Cannot allocate skb for monitor frame\n",
dev->name);
goto update_stats;
}
/* Copy the 802.11 header to the skb */
memcpy(skb_put(skb, hdrlen), &(desc->frame_ctl), hdrlen);
skb_reset_mac_header(skb);
/* If any, copy the data from the card to the skb */
if (datalen > 0) {
err = hw->ops->bap_pread(hw, IRQ_BAP, skb_put(skb, datalen),
ALIGN(datalen, 2), rxfid,
HERMES_802_2_OFFSET);
if (err) {
printk(KERN_ERR "%s: error %d reading monitor frame\n",
dev->name, err);
goto drop;
}
}
skb->dev = dev;
skb->ip_summed = CHECKSUM_NONE;
skb->pkt_type = PACKET_OTHERHOST;
skb->protocol = cpu_to_be16(ETH_P_802_2);
stats->rx_packets++;
stats->rx_bytes += skb->len;
netif_rx(skb);
return;
drop:
dev_kfree_skb_irq(skb);
update_stats:
stats->rx_errors++;
stats->rx_dropped++;
}
void __orinoco_ev_rx(struct net_device *dev, struct hermes *hw)
{
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
struct iw_statistics *wstats = &priv->wstats;
struct sk_buff *skb = NULL;
u16 rxfid, status;
int length;
struct hermes_rx_descriptor *desc;
struct orinoco_rx_data *rx_data;
int err;
desc = kmalloc(sizeof(*desc), GFP_ATOMIC);
if (!desc) {
printk(KERN_WARNING
"%s: Can't allocate space for RX descriptor\n",
dev->name);
goto update_stats;
}
rxfid = hermes_read_regn(hw, RXFID);
err = hw->ops->bap_pread(hw, IRQ_BAP, desc, sizeof(*desc),
rxfid, 0);
if (err) {
printk(KERN_ERR "%s: error %d reading Rx descriptor. "
"Frame dropped.\n", dev->name, err);
goto update_stats;
}
status = le16_to_cpu(desc->status);
if (status & HERMES_RXSTAT_BADCRC) {
DEBUG(1, "%s: Bad CRC on Rx. Frame dropped.\n",
dev->name);
stats->rx_crc_errors++;
goto update_stats;
}
/* Handle frames in monitor mode */
if (priv->iw_mode == NL80211_IFTYPE_MONITOR) {
orinoco_rx_monitor(dev, rxfid, desc);
goto out;
}
if (status & HERMES_RXSTAT_UNDECRYPTABLE) {
DEBUG(1, "%s: Undecryptable frame on Rx. Frame dropped.\n",
dev->name);
wstats->discard.code++;
goto update_stats;
}
length = le16_to_cpu(desc->data_len);
/* Sanity checks */
if (length < 3) { /* No for even an 802.2 LLC header */
/* At least on Symbol firmware with PCF we get quite a
lot of these legitimately - Poll frames with no
data. */
goto out;
}
if (length > IEEE80211_MAX_DATA_LEN) {
printk(KERN_WARNING "%s: Oversized frame received (%d bytes)\n",
dev->name, length);
stats->rx_length_errors++;
goto update_stats;
}
/* Payload size does not include Michael MIC. Increase payload
* size to read it together with the data. */
if (status & HERMES_RXSTAT_MIC)
length += MICHAEL_MIC_LEN;
/* We need space for the packet data itself, plus an ethernet
header, plus 2 bytes so we can align the IP header on a
32bit boundary, plus 1 byte so we can read in odd length
packets from the card, which has an IO granularity of 16
bits */
skb = dev_alloc_skb(length + ETH_HLEN + 2 + 1);
if (!skb) {
printk(KERN_WARNING "%s: Can't allocate skb for Rx\n",
dev->name);
goto update_stats;
}
/* We'll prepend the header, so reserve space for it. The worst
case is no decapsulation, when 802.3 header is prepended and
nothing is removed. 2 is for aligning the IP header. */
skb_reserve(skb, ETH_HLEN + 2);
err = hw->ops->bap_pread(hw, IRQ_BAP, skb_put(skb, length),
ALIGN(length, 2), rxfid,
HERMES_802_2_OFFSET);
if (err) {
printk(KERN_ERR "%s: error %d reading frame. "
"Frame dropped.\n", dev->name, err);
goto drop;
}
/* Add desc and skb to rx queue */
rx_data = kzalloc(sizeof(*rx_data), GFP_ATOMIC);
if (!rx_data)
goto drop;
rx_data->desc = desc;
rx_data->skb = skb;
list_add_tail(&rx_data->list, &priv->rx_list);
tasklet_schedule(&priv->rx_tasklet);
return;
drop:
dev_kfree_skb_irq(skb);
update_stats:
stats->rx_errors++;
stats->rx_dropped++;
out:
kfree(desc);
}
EXPORT_SYMBOL(__orinoco_ev_rx);
static void orinoco_rx(struct net_device *dev,
struct hermes_rx_descriptor *desc,
struct sk_buff *skb)
{
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
u16 status, fc;
int length;
struct ethhdr *hdr;
status = le16_to_cpu(desc->status);
length = le16_to_cpu(desc->data_len);
fc = le16_to_cpu(desc->frame_ctl);
/* Calculate and check MIC */
if (status & HERMES_RXSTAT_MIC) {
struct orinoco_tkip_key *key;
int key_id = ((status & HERMES_RXSTAT_MIC_KEY_ID) >>
HERMES_MIC_KEY_ID_SHIFT);
u8 mic[MICHAEL_MIC_LEN];
u8 *rxmic;
u8 *src = (fc & IEEE80211_FCTL_FROMDS) ?
desc->addr3 : desc->addr2;
/* Extract Michael MIC from payload */
rxmic = skb->data + skb->len - MICHAEL_MIC_LEN;
skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
length -= MICHAEL_MIC_LEN;
key = (struct orinoco_tkip_key *) priv->keys[key_id].key;
if (!key) {
printk(KERN_WARNING "%s: Received encrypted frame from "
"%pM using key %i, but key is not installed\n",
dev->name, src, key_id);
goto drop;
}
orinoco_mic(priv->rx_tfm_mic, key->rx_mic, desc->addr1, src,
0, /* priority or QoS? */
skb->data, skb->len, &mic[0]);
if (memcmp(mic, rxmic,
MICHAEL_MIC_LEN)) {
union iwreq_data wrqu;
struct iw_michaelmicfailure wxmic;
printk(KERN_WARNING "%s: "
"Invalid Michael MIC in data frame from %pM, "
"using key %i\n",
dev->name, src, key_id);
/* TODO: update stats */
/* Notify userspace */
memset(&wxmic, 0, sizeof(wxmic));
wxmic.flags = key_id & IW_MICFAILURE_KEY_ID;
wxmic.flags |= (desc->addr1[0] & 1) ?
IW_MICFAILURE_GROUP : IW_MICFAILURE_PAIRWISE;
wxmic.src_addr.sa_family = ARPHRD_ETHER;
memcpy(wxmic.src_addr.sa_data, src, ETH_ALEN);
(void) orinoco_hw_get_tkip_iv(priv, key_id,
&wxmic.tsc[0]);
memset(&wrqu, 0, sizeof(wrqu));
wrqu.data.length = sizeof(wxmic);
wireless_send_event(dev, IWEVMICHAELMICFAILURE, &wrqu,
(char *) &wxmic);
goto drop;
}
}
/* Handle decapsulation
* In most cases, the firmware tell us about SNAP frames.
* For some reason, the SNAP frames sent by LinkSys APs
* are not properly recognised by most firmwares.
* So, check ourselves */
if (length >= ENCAPS_OVERHEAD &&
(((status & HERMES_RXSTAT_MSGTYPE) == HERMES_RXSTAT_1042) ||
((status & HERMES_RXSTAT_MSGTYPE) == HERMES_RXSTAT_TUNNEL) ||
is_ethersnap(skb->data))) {
/* These indicate a SNAP within 802.2 LLC within
802.11 frame which we'll need to de-encapsulate to
the original EthernetII frame. */
hdr = (struct ethhdr *)skb_push(skb,
ETH_HLEN - ENCAPS_OVERHEAD);
} else {
/* 802.3 frame - prepend 802.3 header as is */
hdr = (struct ethhdr *)skb_push(skb, ETH_HLEN);
hdr->h_proto = htons(length);
}
memcpy(hdr->h_dest, desc->addr1, ETH_ALEN);
if (fc & IEEE80211_FCTL_FROMDS)
memcpy(hdr->h_source, desc->addr3, ETH_ALEN);
else
memcpy(hdr->h_source, desc->addr2, ETH_ALEN);
skb->protocol = eth_type_trans(skb, dev);
skb->ip_summed = CHECKSUM_NONE;
if (fc & IEEE80211_FCTL_TODS)
skb->pkt_type = PACKET_OTHERHOST;
/* Process the wireless stats if needed */
orinoco_stat_gather(dev, skb, desc);
/* Pass the packet to the networking stack */
netif_rx(skb);
stats->rx_packets++;
stats->rx_bytes += length;
return;
drop:
dev_kfree_skb(skb);
stats->rx_errors++;
stats->rx_dropped++;
}
static void orinoco_rx_isr_tasklet(unsigned long data)
{
struct orinoco_private *priv = (struct orinoco_private *) data;
struct net_device *dev = priv->ndev;
struct orinoco_rx_data *rx_data, *temp;
struct hermes_rx_descriptor *desc;
struct sk_buff *skb;
unsigned long flags;
/* orinoco_rx requires the driver lock, and we also need to
* protect priv->rx_list, so just hold the lock over the
* lot.
*
* If orinoco_lock fails, we've unplugged the card. In this
* case just abort. */
if (orinoco_lock(priv, &flags) != 0)
return;
/* extract desc and skb from queue */
list_for_each_entry_safe(rx_data, temp, &priv->rx_list, list) {
desc = rx_data->desc;
skb = rx_data->skb;
list_del(&rx_data->list);
kfree(rx_data);
orinoco_rx(dev, desc, skb);
kfree(desc);
}
orinoco_unlock(priv, &flags);
}
/********************************************************************/
/* Rx path (info frames) */
/********************************************************************/
static void print_linkstatus(struct net_device *dev, u16 status)
{
char *s;
if (suppress_linkstatus)
return;
switch (status) {
case HERMES_LINKSTATUS_NOT_CONNECTED:
s = "Not Connected";
break;
case HERMES_LINKSTATUS_CONNECTED:
s = "Connected";
break;
case HERMES_LINKSTATUS_DISCONNECTED:
s = "Disconnected";
break;
case HERMES_LINKSTATUS_AP_CHANGE:
s = "AP Changed";
break;
case HERMES_LINKSTATUS_AP_OUT_OF_RANGE:
s = "AP Out of Range";
break;
case HERMES_LINKSTATUS_AP_IN_RANGE:
s = "AP In Range";
break;
case HERMES_LINKSTATUS_ASSOC_FAILED:
s = "Association Failed";
break;
default:
s = "UNKNOWN";
}
printk(KERN_DEBUG "%s: New link status: %s (%04x)\n",
dev->name, s, status);
}
/* Search scan results for requested BSSID, join it if found */
static void orinoco_join_ap(struct work_struct *work)
{
struct orinoco_private *priv =
container_of(work, struct orinoco_private, join_work);
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
int err;
unsigned long flags;
struct join_req {
u8 bssid[ETH_ALEN];
__le16 channel;
} __packed req;
const int atom_len = offsetof(struct prism2_scan_apinfo, atim);
struct prism2_scan_apinfo *atom = NULL;
int offset = 4;
int found = 0;
u8 *buf;
u16 len;
/* Allocate buffer for scan results */
buf = kmalloc(MAX_SCAN_LEN, GFP_KERNEL);
if (!buf)
return;
if (orinoco_lock(priv, &flags) != 0)
goto fail_lock;
/* Sanity checks in case user changed something in the meantime */
if (!priv->bssid_fixed)
goto out;
if (strlen(priv->desired_essid) == 0)
goto out;
/* Read scan results from the firmware */
err = hw->ops->read_ltv(hw, USER_BAP,
HERMES_RID_SCANRESULTSTABLE,
MAX_SCAN_LEN, &len, buf);
if (err) {
printk(KERN_ERR "%s: Cannot read scan results\n",
dev->name);
goto out;
}
len = HERMES_RECLEN_TO_BYTES(len);
/* Go through the scan results looking for the channel of the AP
* we were requested to join */
for (; offset + atom_len <= len; offset += atom_len) {
atom = (struct prism2_scan_apinfo *) (buf + offset);
if (memcmp(&atom->bssid, priv->desired_bssid, ETH_ALEN) == 0) {
found = 1;
break;
}
}
if (!found) {
DEBUG(1, "%s: Requested AP not found in scan results\n",
dev->name);
goto out;
}
memcpy(req.bssid, priv->desired_bssid, ETH_ALEN);
req.channel = atom->channel; /* both are little-endian */
err = HERMES_WRITE_RECORD(hw, USER_BAP, HERMES_RID_CNFJOINREQUEST,
&req);
if (err)
printk(KERN_ERR "%s: Error issuing join request\n", dev->name);
out:
orinoco_unlock(priv, &flags);
fail_lock:
kfree(buf);
}
/* Send new BSSID to userspace */
static void orinoco_send_bssid_wevent(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
union iwreq_data wrqu;
int err;
err = hw->ops->read_ltv(hw, USER_BAP, HERMES_RID_CURRENTBSSID,
ETH_ALEN, NULL, wrqu.ap_addr.sa_data);
if (err != 0)
return;
wrqu.ap_addr.sa_family = ARPHRD_ETHER;
/* Send event to user space */
wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
}
static void orinoco_send_assocreqie_wevent(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
union iwreq_data wrqu;
int err;
u8 buf[88];
u8 *ie;
if (!priv->has_wpa)
return;
err = hw->ops->read_ltv(hw, USER_BAP, HERMES_RID_CURRENT_ASSOC_REQ_INFO,
sizeof(buf), NULL, &buf);
if (err != 0)
return;
ie = orinoco_get_wpa_ie(buf, sizeof(buf));
if (ie) {
int rem = sizeof(buf) - (ie - &buf[0]);
wrqu.data.length = ie[1] + 2;
if (wrqu.data.length > rem)
wrqu.data.length = rem;
if (wrqu.data.length)
/* Send event to user space */
wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, ie);
}
}
static void orinoco_send_assocrespie_wevent(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
union iwreq_data wrqu;
int err;
u8 buf[88]; /* TODO: verify max size or IW_GENERIC_IE_MAX */
u8 *ie;
if (!priv->has_wpa)
return;
err = hw->ops->read_ltv(hw, USER_BAP,
HERMES_RID_CURRENT_ASSOC_RESP_INFO,
sizeof(buf), NULL, &buf);
if (err != 0)
return;
ie = orinoco_get_wpa_ie(buf, sizeof(buf));
if (ie) {
int rem = sizeof(buf) - (ie - &buf[0]);
wrqu.data.length = ie[1] + 2;
if (wrqu.data.length > rem)
wrqu.data.length = rem;
if (wrqu.data.length)
/* Send event to user space */
wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, ie);
}
}
static void orinoco_send_wevents(struct work_struct *work)
{
struct orinoco_private *priv =
container_of(work, struct orinoco_private, wevent_work);
unsigned long flags;
if (orinoco_lock(priv, &flags) != 0)
return;
orinoco_send_assocreqie_wevent(priv);
orinoco_send_assocrespie_wevent(priv);
orinoco_send_bssid_wevent(priv);
orinoco_unlock(priv, &flags);
}
static void qbuf_scan(struct orinoco_private *priv, void *buf,
int len, int type)
{
struct orinoco_scan_data *sd;
unsigned long flags;
sd = kmalloc(sizeof(*sd), GFP_ATOMIC);
if (!sd) {
printk(KERN_ERR "%s: failed to alloc memory\n", __func__);
return;
}
sd->buf = buf;
sd->len = len;
sd->type = type;
spin_lock_irqsave(&priv->scan_lock, flags);
list_add_tail(&sd->list, &priv->scan_list);
spin_unlock_irqrestore(&priv->scan_lock, flags);
schedule_work(&priv->process_scan);
}
static void qabort_scan(struct orinoco_private *priv)
{
struct orinoco_scan_data *sd;
unsigned long flags;
sd = kmalloc(sizeof(*sd), GFP_ATOMIC);
if (!sd) {
printk(KERN_ERR "%s: failed to alloc memory\n", __func__);
return;
}
sd->len = -1; /* Abort */
spin_lock_irqsave(&priv->scan_lock, flags);
list_add_tail(&sd->list, &priv->scan_list);
spin_unlock_irqrestore(&priv->scan_lock, flags);
schedule_work(&priv->process_scan);
}
static void orinoco_process_scan_results(struct work_struct *work)
{
struct orinoco_private *priv =
container_of(work, struct orinoco_private, process_scan);
struct orinoco_scan_data *sd, *temp;
unsigned long flags;
void *buf;
int len;
int type;
spin_lock_irqsave(&priv->scan_lock, flags);
list_for_each_entry_safe(sd, temp, &priv->scan_list, list) {
buf = sd->buf;
len = sd->len;
type = sd->type;
list_del(&sd->list);
spin_unlock_irqrestore(&priv->scan_lock, flags);
kfree(sd);
if (len > 0) {
if (type == HERMES_INQ_CHANNELINFO)
orinoco_add_extscan_result(priv, buf, len);
else
orinoco_add_hostscan_results(priv, buf, len);
kfree(buf);
} else {
/* Either abort or complete the scan */
orinoco_scan_done(priv, (len < 0));
}
spin_lock_irqsave(&priv->scan_lock, flags);
}
spin_unlock_irqrestore(&priv->scan_lock, flags);
}
void __orinoco_ev_info(struct net_device *dev, struct hermes *hw)
{
struct orinoco_private *priv = ndev_priv(dev);
u16 infofid;
struct {
__le16 len;
__le16 type;
} __packed info;
int len, type;
int err;
/* This is an answer to an INQUIRE command that we did earlier,
* or an information "event" generated by the card
* The controller return to us a pseudo frame containing
* the information in question - Jean II */
infofid = hermes_read_regn(hw, INFOFID);
/* Read the info frame header - don't try too hard */
err = hw->ops->bap_pread(hw, IRQ_BAP, &info, sizeof(info),
infofid, 0);
if (err) {
printk(KERN_ERR "%s: error %d reading info frame. "
"Frame dropped.\n", dev->name, err);
return;
}
len = HERMES_RECLEN_TO_BYTES(le16_to_cpu(info.len));
type = le16_to_cpu(info.type);
switch (type) {
case HERMES_INQ_TALLIES: {
struct hermes_tallies_frame tallies;
struct iw_statistics *wstats = &priv->wstats;
if (len > sizeof(tallies)) {
printk(KERN_WARNING "%s: Tallies frame too long (%d bytes)\n",
dev->name, len);
len = sizeof(tallies);
}
err = hw->ops->bap_pread(hw, IRQ_BAP, &tallies, len,
infofid, sizeof(info));
if (err)
break;
/* Increment our various counters */
/* wstats->discard.nwid - no wrong BSSID stuff */
wstats->discard.code +=
le16_to_cpu(tallies.RxWEPUndecryptable);
if (len == sizeof(tallies))
wstats->discard.code +=
le16_to_cpu(tallies.RxDiscards_WEPICVError) +
le16_to_cpu(tallies.RxDiscards_WEPExcluded);
wstats->discard.misc +=
le16_to_cpu(tallies.TxDiscardsWrongSA);
wstats->discard.fragment +=
le16_to_cpu(tallies.RxMsgInBadMsgFragments);
wstats->discard.retries +=
le16_to_cpu(tallies.TxRetryLimitExceeded);
/* wstats->miss.beacon - no match */
}
break;
case HERMES_INQ_LINKSTATUS: {
struct hermes_linkstatus linkstatus;
u16 newstatus;
int connected;
if (priv->iw_mode == NL80211_IFTYPE_MONITOR)
break;
if (len != sizeof(linkstatus)) {
printk(KERN_WARNING "%s: Unexpected size for linkstatus frame (%d bytes)\n",
dev->name, len);
break;
}
err = hw->ops->bap_pread(hw, IRQ_BAP, &linkstatus, len,
infofid, sizeof(info));
if (err)
break;
newstatus = le16_to_cpu(linkstatus.linkstatus);
/* Symbol firmware uses "out of range" to signal that
* the hostscan frame can be requested. */
if (newstatus == HERMES_LINKSTATUS_AP_OUT_OF_RANGE &&
priv->firmware_type == FIRMWARE_TYPE_SYMBOL &&
priv->has_hostscan && priv->scan_request) {
hermes_inquire(hw, HERMES_INQ_HOSTSCAN_SYMBOL);
break;
}
connected = (newstatus == HERMES_LINKSTATUS_CONNECTED)
|| (newstatus == HERMES_LINKSTATUS_AP_CHANGE)
|| (newstatus == HERMES_LINKSTATUS_AP_IN_RANGE);
if (connected)
netif_carrier_on(dev);
else if (!ignore_disconnect)
netif_carrier_off(dev);
if (newstatus != priv->last_linkstatus) {
priv->last_linkstatus = newstatus;
print_linkstatus(dev, newstatus);
/* The info frame contains only one word which is the
* status (see hermes.h). The status is pretty boring
* in itself, that's why we export the new BSSID...
* Jean II */
schedule_work(&priv->wevent_work);
}
}
break;
case HERMES_INQ_SCAN:
if (!priv->scan_request && priv->bssid_fixed &&
priv->firmware_type == FIRMWARE_TYPE_INTERSIL) {
schedule_work(&priv->join_work);
break;
}
/* fall through */
case HERMES_INQ_HOSTSCAN:
case HERMES_INQ_HOSTSCAN_SYMBOL: {
/* Result of a scanning. Contains information about
* cells in the vicinity - Jean II */
unsigned char *buf;
/* Sanity check */
if (len > 4096) {
printk(KERN_WARNING "%s: Scan results too large (%d bytes)\n",
dev->name, len);
qabort_scan(priv);
break;
}
/* Allocate buffer for results */
buf = kmalloc(len, GFP_ATOMIC);
if (buf == NULL) {
/* No memory, so can't printk()... */
qabort_scan(priv);
break;
}
/* Read scan data */
err = hw->ops->bap_pread(hw, IRQ_BAP, (void *) buf, len,
infofid, sizeof(info));
if (err) {
kfree(buf);
qabort_scan(priv);
break;
}
#ifdef ORINOCO_DEBUG
{
int i;
printk(KERN_DEBUG "Scan result [%02X", buf[0]);
for (i = 1; i < (len * 2); i++)
printk(":%02X", buf[i]);
printk("]\n");
}
#endif /* ORINOCO_DEBUG */
qbuf_scan(priv, buf, len, type);
}
break;
case HERMES_INQ_CHANNELINFO:
{
struct agere_ext_scan_info *bss;
if (!priv->scan_request) {
printk(KERN_DEBUG "%s: Got chaninfo without scan, "
"len=%d\n", dev->name, len);
break;
}
/* An empty result indicates that the scan is complete */
if (len == 0) {
qbuf_scan(priv, NULL, len, type);
break;
}
/* Sanity check */
else if (len < (offsetof(struct agere_ext_scan_info,
data) + 2)) {
/* Drop this result now so we don't have to
* keep checking later */
printk(KERN_WARNING
"%s: Ext scan results too short (%d bytes)\n",
dev->name, len);
break;
}
bss = kmalloc(len, GFP_ATOMIC);
if (bss == NULL)
break;
/* Read scan data */
err = hw->ops->bap_pread(hw, IRQ_BAP, (void *) bss, len,
infofid, sizeof(info));
if (err)
kfree(bss);
else
qbuf_scan(priv, bss, len, type);
break;
}
case HERMES_INQ_SEC_STAT_AGERE:
/* Security status (Agere specific) */
/* Ignore this frame for now */
if (priv->firmware_type == FIRMWARE_TYPE_AGERE)
break;
/* fall through */
default:
printk(KERN_DEBUG "%s: Unknown information frame received: "
"type 0x%04x, length %d\n", dev->name, type, len);
/* We don't actually do anything about it */
break;
}
}
EXPORT_SYMBOL(__orinoco_ev_info);
static void __orinoco_ev_infdrop(struct net_device *dev, struct hermes *hw)
{
if (net_ratelimit())
printk(KERN_DEBUG "%s: Information frame lost.\n", dev->name);
}
/********************************************************************/
/* Internal hardware control routines */
/********************************************************************/
static int __orinoco_up(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
int err;
netif_carrier_off(dev); /* just to make sure */
err = __orinoco_commit(priv);
if (err) {
printk(KERN_ERR "%s: Error %d configuring card\n",
dev->name, err);
return err;
}
/* Fire things up again */
hermes_set_irqmask(hw, ORINOCO_INTEN);
err = hermes_enable_port(hw, 0);
if (err) {
printk(KERN_ERR "%s: Error %d enabling MAC port\n",
dev->name, err);
return err;
}
netif_start_queue(dev);
return 0;
}
static int __orinoco_down(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
int err;
netif_stop_queue(dev);
if (!priv->hw_unavailable) {
if (!priv->broken_disableport) {
err = hermes_disable_port(hw, 0);
if (err) {
/* Some firmwares (e.g. Intersil 1.3.x) seem
* to have problems disabling the port, oh
* well, too bad. */
printk(KERN_WARNING "%s: Error %d disabling MAC port\n",
dev->name, err);
priv->broken_disableport = 1;
}
}
hermes_set_irqmask(hw, 0);
hermes_write_regn(hw, EVACK, 0xffff);
}
orinoco_scan_done(priv, true);
/* firmware will have to reassociate */
netif_carrier_off(dev);
priv->last_linkstatus = 0xffff;
return 0;
}
static int orinoco_reinit_firmware(struct orinoco_private *priv)
{
struct hermes *hw = &priv->hw;
int err;
err = hw->ops->init(hw);
if (priv->do_fw_download && !err) {
err = orinoco_download(priv);
if (err)
priv->do_fw_download = 0;
}
if (!err)
err = orinoco_hw_allocate_fid(priv);
return err;
}
static int
__orinoco_set_multicast_list(struct net_device *dev)
{
struct orinoco_private *priv = ndev_priv(dev);
int err = 0;
int promisc, mc_count;
/* The Hermes doesn't seem to have an allmulti mode, so we go
* into promiscuous mode and let the upper levels deal. */
if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
(netdev_mc_count(dev) > MAX_MULTICAST(priv))) {
promisc = 1;
mc_count = 0;
} else {
promisc = 0;
mc_count = netdev_mc_count(dev);
}
err = __orinoco_hw_set_multicast_list(priv, dev, mc_count, promisc);
return err;
}
/* This must be called from user context, without locks held - use
* schedule_work() */
void orinoco_reset(struct work_struct *work)
{
struct orinoco_private *priv =
container_of(work, struct orinoco_private, reset_work);
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
int err;
unsigned long flags;
if (orinoco_lock(priv, &flags) != 0)
/* When the hardware becomes available again, whatever
* detects that is responsible for re-initializing
* it. So no need for anything further */
return;
netif_stop_queue(dev);
/* Shut off interrupts. Depending on what state the hardware
* is in, this might not work, but we'll try anyway */
hermes_set_irqmask(hw, 0);
hermes_write_regn(hw, EVACK, 0xffff);
priv->hw_unavailable++;
priv->last_linkstatus = 0xffff; /* firmware will have to reassociate */
netif_carrier_off(dev);
orinoco_unlock(priv, &flags);
/* Scanning support: Notify scan cancellation */
orinoco_scan_done(priv, true);
if (priv->hard_reset) {
err = (*priv->hard_reset)(priv);
if (err) {
printk(KERN_ERR "%s: orinoco_reset: Error %d "
"performing hard reset\n", dev->name, err);
goto disable;
}
}
err = orinoco_reinit_firmware(priv);
if (err) {
printk(KERN_ERR "%s: orinoco_reset: Error %d re-initializing firmware\n",
dev->name, err);
goto disable;
}
/* This has to be called from user context */
orinoco_lock_irq(priv);
priv->hw_unavailable--;
/* priv->open or priv->hw_unavailable might have changed while
* we dropped the lock */
if (priv->open && (!priv->hw_unavailable)) {
err = __orinoco_up(priv);
if (err) {
printk(KERN_ERR "%s: orinoco_reset: Error %d reenabling card\n",
dev->name, err);
} else
dev->trans_start = jiffies;
}
orinoco_unlock_irq(priv);
return;
disable:
hermes_set_irqmask(hw, 0);
netif_device_detach(dev);
printk(KERN_ERR "%s: Device has been disabled!\n", dev->name);
}
static int __orinoco_commit(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
int err = 0;
/* If we've called commit, we are reconfiguring or bringing the
* interface up. Maintaining countermeasures across this would
* be confusing, so note that we've disabled them. The port will
* be enabled later in orinoco_commit or __orinoco_up. */
priv->tkip_cm_active = 0;
err = orinoco_hw_program_rids(priv);
/* FIXME: what about netif_tx_lock */
(void) __orinoco_set_multicast_list(dev);
return err;
}
/* Ensures configuration changes are applied. May result in a reset.
* The caller should hold priv->lock
*/
int orinoco_commit(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
int err;
if (priv->broken_disableport) {
schedule_work(&priv->reset_work);
return 0;
}
err = hermes_disable_port(hw, 0);
if (err) {
printk(KERN_WARNING "%s: Unable to disable port "
"while reconfiguring card\n", dev->name);
priv->broken_disableport = 1;
goto out;
}
err = __orinoco_commit(priv);
if (err) {
printk(KERN_WARNING "%s: Unable to reconfigure card\n",
dev->name);
goto out;
}
err = hermes_enable_port(hw, 0);
if (err) {
printk(KERN_WARNING "%s: Unable to enable port while reconfiguring card\n",
dev->name);
goto out;
}
out:
if (err) {
printk(KERN_WARNING "%s: Resetting instead...\n", dev->name);
schedule_work(&priv->reset_work);
err = 0;
}
return err;
}
/********************************************************************/
/* Interrupt handler */
/********************************************************************/
static void __orinoco_ev_tick(struct net_device *dev, struct hermes *hw)
{
printk(KERN_DEBUG "%s: TICK\n", dev->name);
}
static void __orinoco_ev_wterr(struct net_device *dev, struct hermes *hw)
{
/* This seems to happen a fair bit under load, but ignoring it
seems to work fine...*/
printk(KERN_DEBUG "%s: MAC controller error (WTERR). Ignoring.\n",
dev->name);
}
irqreturn_t orinoco_interrupt(int irq, void *dev_id)
{
struct orinoco_private *priv = dev_id;
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
int count = MAX_IRQLOOPS_PER_IRQ;
u16 evstat, events;
/* These are used to detect a runaway interrupt situation.
*
* If we get more than MAX_IRQLOOPS_PER_JIFFY iterations in a jiffy,
* we panic and shut down the hardware
*/
/* jiffies value the last time we were called */
static int last_irq_jiffy; /* = 0 */
static int loops_this_jiffy; /* = 0 */
unsigned long flags;
if (orinoco_lock(priv, &flags) != 0) {
/* If hw is unavailable - we don't know if the irq was
* for us or not */
return IRQ_HANDLED;
}
evstat = hermes_read_regn(hw, EVSTAT);
events = evstat & hw->inten;
if (!events) {
orinoco_unlock(priv, &flags);
return IRQ_NONE;
}
if (jiffies != last_irq_jiffy)
loops_this_jiffy = 0;
last_irq_jiffy = jiffies;
while (events && count--) {
if (++loops_this_jiffy > MAX_IRQLOOPS_PER_JIFFY) {
printk(KERN_WARNING "%s: IRQ handler is looping too "
"much! Resetting.\n", dev->name);
/* Disable interrupts for now */
hermes_set_irqmask(hw, 0);
schedule_work(&priv->reset_work);
break;
}
/* Check the card hasn't been removed */
if (!hermes_present(hw)) {
DEBUG(0, "orinoco_interrupt(): card removed\n");
break;
}
if (events & HERMES_EV_TICK)
__orinoco_ev_tick(dev, hw);
if (events & HERMES_EV_WTERR)
__orinoco_ev_wterr(dev, hw);
if (events & HERMES_EV_INFDROP)
__orinoco_ev_infdrop(dev, hw);
if (events & HERMES_EV_INFO)
__orinoco_ev_info(dev, hw);
if (events & HERMES_EV_RX)
__orinoco_ev_rx(dev, hw);
if (events & HERMES_EV_TXEXC)
__orinoco_ev_txexc(dev, hw);
if (events & HERMES_EV_TX)
__orinoco_ev_tx(dev, hw);
if (events & HERMES_EV_ALLOC)
__orinoco_ev_alloc(dev, hw);
hermes_write_regn(hw, EVACK, evstat);
evstat = hermes_read_regn(hw, EVSTAT);
events = evstat & hw->inten;
}
orinoco_unlock(priv, &flags);
return IRQ_HANDLED;
}
EXPORT_SYMBOL(orinoco_interrupt);
/********************************************************************/
/* Power management */
/********************************************************************/
#if defined(CONFIG_PM_SLEEP) && !defined(CONFIG_HERMES_CACHE_FW_ON_INIT)
static int orinoco_pm_notifier(struct notifier_block *notifier,
unsigned long pm_event,
void *unused)
{
struct orinoco_private *priv = container_of(notifier,
struct orinoco_private,
pm_notifier);
/* All we need to do is cache the firmware before suspend, and
* release it when we come out.
*
* Only need to do this if we're downloading firmware. */
if (!priv->do_fw_download)
return NOTIFY_DONE;
switch (pm_event) {
case PM_HIBERNATION_PREPARE:
case PM_SUSPEND_PREPARE:
orinoco_cache_fw(priv, 0);
break;
case PM_POST_RESTORE:
/* Restore from hibernation failed. We need to clean
* up in exactly the same way, so fall through. */
case PM_POST_HIBERNATION:
case PM_POST_SUSPEND:
orinoco_uncache_fw(priv);
break;
case PM_RESTORE_PREPARE:
default:
break;
}
return NOTIFY_DONE;
}
static void orinoco_register_pm_notifier(struct orinoco_private *priv)
{
priv->pm_notifier.notifier_call = orinoco_pm_notifier;
register_pm_notifier(&priv->pm_notifier);
}
static void orinoco_unregister_pm_notifier(struct orinoco_private *priv)
{
unregister_pm_notifier(&priv->pm_notifier);
}
#else /* !PM_SLEEP || HERMES_CACHE_FW_ON_INIT */
#define orinoco_register_pm_notifier(priv) do { } while (0)
#define orinoco_unregister_pm_notifier(priv) do { } while (0)
#endif
/********************************************************************/
/* Initialization */
/********************************************************************/
int orinoco_init(struct orinoco_private *priv)
{
struct device *dev = priv->dev;
struct wiphy *wiphy = priv_to_wiphy(priv);
struct hermes *hw = &priv->hw;
int err = 0;
/* No need to lock, the hw_unavailable flag is already set in
* alloc_orinocodev() */
priv->nicbuf_size = IEEE80211_MAX_FRAME_LEN + ETH_HLEN;
/* Initialize the firmware */
err = hw->ops->init(hw);
if (err != 0) {
dev_err(dev, "Failed to initialize firmware (err = %d)\n",
err);
goto out;
}
err = determine_fw_capabilities(priv, wiphy->fw_version,
sizeof(wiphy->fw_version),
&wiphy->hw_version);
if (err != 0) {
dev_err(dev, "Incompatible firmware, aborting\n");
goto out;
}
if (priv->do_fw_download) {
#ifdef CONFIG_HERMES_CACHE_FW_ON_INIT
orinoco_cache_fw(priv, 0);
#endif
err = orinoco_download(priv);
if (err)
priv->do_fw_download = 0;
/* Check firmware version again */
err = determine_fw_capabilities(priv, wiphy->fw_version,
sizeof(wiphy->fw_version),
&wiphy->hw_version);
if (err != 0) {
dev_err(dev, "Incompatible firmware, aborting\n");
goto out;
}
}
if (priv->has_port3)
dev_info(dev, "Ad-hoc demo mode supported\n");
if (priv->has_ibss)
dev_info(dev, "IEEE standard IBSS ad-hoc mode supported\n");
if (priv->has_wep)
dev_info(dev, "WEP supported, %s-bit key\n",
priv->has_big_wep ? "104" : "40");
if (priv->has_wpa) {
dev_info(dev, "WPA-PSK supported\n");
if (orinoco_mic_init(priv)) {
dev_err(dev, "Failed to setup MIC crypto algorithm. "
"Disabling WPA support\n");
priv->has_wpa = 0;
}
}
err = orinoco_hw_read_card_settings(priv, wiphy->perm_addr);
if (err)
goto out;
err = orinoco_hw_allocate_fid(priv);
if (err) {
dev_err(dev, "Failed to allocate NIC buffer!\n");
goto out;
}
/* Set up the default configuration */
priv->iw_mode = NL80211_IFTYPE_STATION;
/* By default use IEEE/IBSS ad-hoc mode if we have it */
priv->prefer_port3 = priv->has_port3 && (!priv->has_ibss);
set_port_type(priv);
priv->channel = 0; /* use firmware default */
priv->promiscuous = 0;
priv->encode_alg = ORINOCO_ALG_NONE;
priv->tx_key = 0;
priv->wpa_enabled = 0;
priv->tkip_cm_active = 0;
priv->key_mgmt = 0;
priv->wpa_ie_len = 0;
priv->wpa_ie = NULL;
if (orinoco_wiphy_register(wiphy)) {
err = -ENODEV;
goto out;
}
/* Make the hardware available, as long as it hasn't been
* removed elsewhere (e.g. by PCMCIA hot unplug) */
orinoco_lock_irq(priv);
priv->hw_unavailable--;
orinoco_unlock_irq(priv);
dev_dbg(dev, "Ready\n");
out:
return err;
}
EXPORT_SYMBOL(orinoco_init);
static const struct net_device_ops orinoco_netdev_ops = {
.ndo_open = orinoco_open,
.ndo_stop = orinoco_stop,
.ndo_start_xmit = orinoco_xmit,
.ndo_set_rx_mode = orinoco_set_multicast_list,
.ndo_change_mtu = orinoco_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
.ndo_tx_timeout = orinoco_tx_timeout,
.ndo_get_stats = orinoco_get_stats,
};
/* Allocate private data.
*
* This driver has a number of structures associated with it
* netdev - Net device structure for each network interface
* wiphy - structure associated with wireless phy
* wireless_dev (wdev) - structure for each wireless interface
* hw - structure for hermes chip info
* card - card specific structure for use by the card driver
* (airport, orinoco_cs)
* priv - orinoco private data
* device - generic linux device structure
*
* +---------+ +---------+
* | wiphy | | netdev |
* | +-------+ | +-------+
* | | priv | | | wdev |
* | | +-----+ +-+-------+
* | | | hw |
* | +-+-----+
* | | card |
* +-+-------+
*
* priv has a link to netdev and device
* wdev has a link to wiphy
*/
struct orinoco_private
*alloc_orinocodev(int sizeof_card,
struct device *device,
int (*hard_reset)(struct orinoco_private *),
int (*stop_fw)(struct orinoco_private *, int))
{
struct orinoco_private *priv;
struct wiphy *wiphy;
/* allocate wiphy
* NOTE: We only support a single virtual interface
* but this may change when monitor mode is added
*/
wiphy = wiphy_new(&orinoco_cfg_ops,
sizeof(struct orinoco_private) + sizeof_card);
if (!wiphy)
return NULL;
priv = wiphy_priv(wiphy);
priv->dev = device;
if (sizeof_card)
priv->card = (void *)((unsigned long)priv
+ sizeof(struct orinoco_private));
else
priv->card = NULL;
orinoco_wiphy_init(wiphy);
#ifdef WIRELESS_SPY
priv->wireless_data.spy_data = &priv->spy_data;
#endif
/* Set up default callbacks */
priv->hard_reset = hard_reset;
priv->stop_fw = stop_fw;
spin_lock_init(&priv->lock);
priv->open = 0;
priv->hw_unavailable = 1; /* orinoco_init() must clear this
* before anything else touches the
* hardware */
INIT_WORK(&priv->reset_work, orinoco_reset);
INIT_WORK(&priv->join_work, orinoco_join_ap);
INIT_WORK(&priv->wevent_work, orinoco_send_wevents);
INIT_LIST_HEAD(&priv->rx_list);
tasklet_init(&priv->rx_tasklet, orinoco_rx_isr_tasklet,
(unsigned long) priv);
spin_lock_init(&priv->scan_lock);
INIT_LIST_HEAD(&priv->scan_list);
INIT_WORK(&priv->process_scan, orinoco_process_scan_results);
priv->last_linkstatus = 0xffff;
#if defined(CONFIG_HERMES_CACHE_FW_ON_INIT) || defined(CONFIG_PM_SLEEP)
priv->cached_pri_fw = NULL;
priv->cached_fw = NULL;
#endif
/* Register PM notifiers */
orinoco_register_pm_notifier(priv);
return priv;
}
EXPORT_SYMBOL(alloc_orinocodev);
/* We can only support a single interface. We provide a separate
* function to set it up to distinguish between hardware
* initialisation and interface setup.
*
* The base_addr and irq parameters are passed on to netdev for use
* with SIOCGIFMAP.
*/
int orinoco_if_add(struct orinoco_private *priv,
unsigned long base_addr,
unsigned int irq,
const struct net_device_ops *ops)
{
struct wiphy *wiphy = priv_to_wiphy(priv);
struct wireless_dev *wdev;
struct net_device *dev;
int ret;
dev = alloc_etherdev(sizeof(struct wireless_dev));
if (!dev)
return -ENOMEM;
/* Initialise wireless_dev */
wdev = netdev_priv(dev);
wdev->wiphy = wiphy;
wdev->iftype = NL80211_IFTYPE_STATION;
/* Setup / override net_device fields */
dev->ieee80211_ptr = wdev;
dev->watchdog_timeo = HZ; /* 1 second timeout */
dev->wireless_handlers = &orinoco_handler_def;
#ifdef WIRELESS_SPY
dev->wireless_data = &priv->wireless_data;
#endif
/* Default to standard ops if not set */
if (ops)
dev->netdev_ops = ops;
else
dev->netdev_ops = &orinoco_netdev_ops;
/* we use the default eth_mac_addr for setting the MAC addr */
/* Reserve space in skb for the SNAP header */
dev->needed_headroom = ENCAPS_OVERHEAD;
netif_carrier_off(dev);
memcpy(dev->dev_addr, wiphy->perm_addr, ETH_ALEN);
memcpy(dev->perm_addr, wiphy->perm_addr, ETH_ALEN);
dev->base_addr = base_addr;
dev->irq = irq;
SET_NETDEV_DEV(dev, priv->dev);
ret = register_netdev(dev);
if (ret)
goto fail;
priv->ndev = dev;
/* Report what we've done */
dev_dbg(priv->dev, "Registerred interface %s.\n", dev->name);
return 0;
fail:
free_netdev(dev);
return ret;
}
EXPORT_SYMBOL(orinoco_if_add);
void orinoco_if_del(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
unregister_netdev(dev);
free_netdev(dev);
}
EXPORT_SYMBOL(orinoco_if_del);
void free_orinocodev(struct orinoco_private *priv)
{
struct wiphy *wiphy = priv_to_wiphy(priv);
struct orinoco_rx_data *rx_data, *temp;
struct orinoco_scan_data *sd, *sdtemp;
wiphy_unregister(wiphy);
/* If the tasklet is scheduled when we call tasklet_kill it
* will run one final time. However the tasklet will only
* drain priv->rx_list if the hw is still available. */
tasklet_kill(&priv->rx_tasklet);
/* Explicitly drain priv->rx_list */
list_for_each_entry_safe(rx_data, temp, &priv->rx_list, list) {
list_del(&rx_data->list);
dev_kfree_skb(rx_data->skb);
kfree(rx_data->desc);
kfree(rx_data);
}
cancel_work_sync(&priv->process_scan);
/* Explicitly drain priv->scan_list */
list_for_each_entry_safe(sd, sdtemp, &priv->scan_list, list) {
list_del(&sd->list);
if ((sd->len > 0) && sd->buf)
kfree(sd->buf);
kfree(sd);
}
orinoco_unregister_pm_notifier(priv);
orinoco_uncache_fw(priv);
priv->wpa_ie_len = 0;
kfree(priv->wpa_ie);
orinoco_mic_free(priv);
wiphy_free(wiphy);
}
EXPORT_SYMBOL(free_orinocodev);
int orinoco_up(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
unsigned long flags;
int err;
priv->hw.ops->lock_irqsave(&priv->lock, &flags);
err = orinoco_reinit_firmware(priv);
if (err) {
printk(KERN_ERR "%s: Error %d re-initializing firmware\n",
dev->name, err);
goto exit;
}
netif_device_attach(dev);
priv->hw_unavailable--;
if (priv->open && !priv->hw_unavailable) {
err = __orinoco_up(priv);
if (err)
printk(KERN_ERR "%s: Error %d restarting card\n",
dev->name, err);
}
exit:
priv->hw.ops->unlock_irqrestore(&priv->lock, &flags);
return 0;
}
EXPORT_SYMBOL(orinoco_up);
void orinoco_down(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
unsigned long flags;
int err;
priv->hw.ops->lock_irqsave(&priv->lock, &flags);
err = __orinoco_down(priv);
if (err)
printk(KERN_WARNING "%s: Error %d downing interface\n",
dev->name, err);
netif_device_detach(dev);
priv->hw_unavailable++;
priv->hw.ops->unlock_irqrestore(&priv->lock, &flags);
}
EXPORT_SYMBOL(orinoco_down);
/********************************************************************/
/* Module initialization */
/********************************************************************/
/* Can't be declared "const" or the whole __initdata section will
* become const */
static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION
" (David Gibson <hermes@gibson.dropbear.id.au>, "
"Pavel Roskin <proski@gnu.org>, et al)";
static int __init init_orinoco(void)
{
printk(KERN_DEBUG "%s\n", version);
return 0;
}
static void __exit exit_orinoco(void)
{
}
module_init(init_orinoco);
module_exit(exit_orinoco);
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