diff options
Diffstat (limited to 'drivers/net/wireless/orinoco/main.c')
| -rw-r--r-- | drivers/net/wireless/orinoco/main.c | 2667 |
1 files changed, 2667 insertions, 0 deletions
diff --git a/drivers/net/wireless/orinoco/main.c b/drivers/net/wireless/orinoco/main.c new file mode 100644 index 00000000000..345593c4acc --- /dev/null +++ b/drivers/net/wireless/orinoco/main.c @@ -0,0 +1,2667 @@ +/* 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/init.h> +#include <linux/delay.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/ethtool.h> +#include <linux/suspend.h> +#include <linux/if_arp.h> +#include <linux/wireless.h> +#include <linux/ieee80211.h> +#include <net/iw_handler.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 "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 int 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 SYMBOL_MAX_VER_LEN (14) +#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 TX_NICBUF_SIZE_BUG 1585 /* Bug in Symbol firmware */ + +#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) + +static const struct ethtool_ops orinoco_ethtool_ops; + +/********************************************************************/ +/* 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]; +} __attribute__ ((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; +} __attribute__ ((packed)); + +struct orinoco_rx_data { + struct hermes_rx_descriptor *desc; + struct sk_buff *skb; + struct list_head list; +}; + +/********************************************************************/ +/* Function prototypes */ +/********************************************************************/ + +static void __orinoco_set_multicast_list(struct net_device *dev); + +/********************************************************************/ +/* Internal helper functions */ +/********************************************************************/ + +void set_port_type(struct orinoco_private *priv) +{ + switch (priv->iw_mode) { + case IW_MODE_INFRA: + priv->port_type = 1; + priv->createibss = 0; + break; + case IW_MODE_ADHOC: + if (priv->prefer_port3) { + priv->port_type = 3; + priv->createibss = 0; + } else { + priv->port_type = priv->ibss_port; + priv->createibss = 1; + } + break; + case IW_MODE_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 */ +/********************************************************************/ + +static int orinoco_open(struct net_device *dev) +{ + struct orinoco_private *priv = netdev_priv(dev); + unsigned long flags; + int err; + + if (orinoco_lock(priv, &flags) != 0) + return -EBUSY; + + err = __orinoco_up(dev); + + if (!err) + priv->open = 1; + + orinoco_unlock(priv, &flags); + + return err; +} + +static int orinoco_stop(struct net_device *dev) +{ + struct orinoco_private *priv = netdev_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) */ + spin_lock_irq(&priv->lock); + + priv->open = 0; + + err = __orinoco_down(dev); + + spin_unlock_irq(&priv->lock); + + return err; +} + +static struct net_device_stats *orinoco_get_stats(struct net_device *dev) +{ + struct orinoco_private *priv = netdev_priv(dev); + + return &priv->stats; +} + +static void orinoco_set_multicast_list(struct net_device *dev) +{ + struct orinoco_private *priv = netdev_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); +} + +static int orinoco_change_mtu(struct net_device *dev, int new_mtu) +{ + struct orinoco_private *priv = netdev_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; +} + +/********************************************************************/ +/* Tx path */ +/********************************************************************/ + +static int orinoco_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct orinoco_private *priv = netdev_priv(dev); + struct net_device_stats *stats = &priv->stats; + hermes_t *hw = &priv->hw; + int err = 0; + u16 txfid = priv->txfid; + struct ethhdr *eh; + int tx_control; + unsigned long flags; + + 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 == IW_MODE_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; + + if (priv->encode_alg == IW_ENCODE_ALG_TKIP) + tx_control |= (priv->tx_key << HERMES_MIC_KEY_ID_SHIFT) | + HERMES_TXCTRL_MIC; + + 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 = hermes_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 = hermes_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); + } + + 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 */ + } __attribute__ ((packed)) hdr; + + /* Strip destination and source from the data */ + skb_pull(skb, 2 * ETH_ALEN); + + /* And move them to a separate header */ + memcpy(&hdr.eth, eh, 2 * ETH_ALEN); + hdr.eth.h_proto = htons(sizeof(encaps_hdr) + skb->len); + memcpy(hdr.encap, encaps_hdr, sizeof(encaps_hdr)); + + /* Insert the SNAP header */ + if (skb_headroom(skb) < sizeof(hdr)) { + printk(KERN_ERR + "%s: Not enough headroom for 802.2 headers %d\n", + dev->name, skb_headroom(skb)); + goto drop; + } + eh = (struct ethhdr *) skb_push(skb, sizeof(hdr)); + memcpy(eh, &hdr, sizeof(hdr)); + } + + err = hermes_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; + } + + /* Calculate Michael MIC */ + if (priv->encode_alg == IW_ENCODE_ALG_TKIP) { + u8 mic_buf[MICHAEL_MIC_LEN + 1]; + u8 *mic; + size_t offset; + size_t len; + + if (skb->len % 2) { + /* MIC start is on an odd boundary */ + mic_buf[0] = skb->data[skb->len - 1]; + mic = &mic_buf[1]; + offset = skb->len - 1; + len = MICHAEL_MIC_LEN + 1; + } else { + mic = &mic_buf[0]; + offset = skb->len; + len = MICHAEL_MIC_LEN; + } + + orinoco_mic(priv->tx_tfm_mic, + priv->tkip_key[priv->tx_key].tx_mic, + eh->h_dest, eh->h_source, 0 /* priority */, + skb->data + ETH_HLEN, skb->len - ETH_HLEN, mic); + + /* Write the MIC */ + err = hermes_bap_pwrite(hw, USER_BAP, &mic_buf[0], len, + txfid, HERMES_802_3_OFFSET + 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 = hermes_docmd_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; + } + + dev->trans_start = jiffies; + 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, hermes_t *hw) +{ + struct orinoco_private *priv = netdev_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, hermes_t *hw) +{ + struct orinoco_private *priv = netdev_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, hermes_t *hw) +{ + struct orinoco_private *priv = netdev_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 = hermes_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); +} + +static void orinoco_tx_timeout(struct net_device *dev) +{ + struct orinoco_private *priv = netdev_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); +} + +/********************************************************************/ +/* 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 = netdev_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 = netdev_priv(dev); + struct net_device_stats *stats = &priv->stats; + hermes_t *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 = hermes_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++; +} + +static void __orinoco_ev_rx(struct net_device *dev, hermes_t *hw) +{ + struct orinoco_private *priv = netdev_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 = hermes_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 == IW_MODE_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 = hermes_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) { + printk(KERN_WARNING "%s: Can't allocate RX packet\n", + dev->name); + 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); +} + +static void orinoco_rx(struct net_device *dev, + struct hermes_rx_descriptor *desc, + struct sk_buff *skb) +{ + struct orinoco_private *priv = netdev_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) { + 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; + + orinoco_mic(priv->rx_tfm_mic, + priv->tkip_key[key_id].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 net_device *dev = (struct net_device *) data; + struct orinoco_private *priv = netdev_priv(dev); + 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; + } __attribute__ ((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 = hermes_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; |