ray_cs.c

pcmcia source code

/*=============================================================================
 *
 * A  PCMCIA client driver for the Raylink wireless LAN card.
 * The starting point for this module was the skeleton.c in the
 * PCMCIA 2.9.12 package written by David Hinds, [e-mail]
 *
 *
 * Copyright (c) 1998  Corey Thomas ([e-mail])
 *
 * This driver is free software; you can redistribute it and/or modify
 * it under the terms of version 2 only of the GNU General Public License as 
 * published by the Free Software Foundation.
 *
 * It is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 * 
=============================================================================*/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/byteorder.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/ioport.h>
#include <linux/skbuff.h>

#include <pcmcia/version.h>
#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/ds.h>
#include <pcmcia/mem_op.h>

#ifdef CONFIG_NET_PCMCIA_RADIO
#include <linux/wireless.h>
#if WIRELESS_EXT < 9
#warning "Wireless extension v9 or newer required"
#endif	/* WIRELESS_EXT < 9 */
/* Warning : these stuff will slow down the driver... */
#define WIRELESS_SPY		/* Enable spying addresses */
/* Definitions we need for spy */
typedef struct iw_statistics	iw_stats;
typedef struct iw_quality	iw_qual;
typedef u_char	mac_addr[ETH_ALEN];	/* Hardware address */
#endif	/* CONFIG_NET_PCMCIA_RADIO */

#include "rayctl.h"
#include "ray_cs.h"

/* All the PCMCIA modules use PCMCIA_DEBUG to control debugging.  If
   you do not define PCMCIA_DEBUG at all, all the debug code will be
   left out.  If you compile with PCMCIA_DEBUG=0, the debug code will
   be present but disabled -- but it can then be enabled for specific
   modules at load time with a 'pc_debug=#' option to insmod.
*/

#ifdef RAYLINK_DEBUG
#define PCMCIA_DEBUG RAYLINK_DEBUG
#endif
#ifdef PCMCIA_DEBUG
static int ray_debug = 0;
static int pc_debug = PCMCIA_DEBUG;
MODULE_PARM(pc_debug, "i");
/* #define DEBUG(n, args...) if (pc_debug>(n)) printk(KERN_DEBUG args); */
#define DEBUG(n, args...) if (pc_debug>(n)) printk(args);
#else
#define DEBUG(n, args...)
#endif
/** Prototypes based on PCMCIA skeleton driver *******************************/
static void ray_config(dev_link_t *link);
static void ray_release(u_long arg);
static int ray_event(event_t event, int priority, event_callback_args_t *args);
static dev_link_t *ray_attach(void);
static void ray_detach(dev_link_t *);

/***** Prototypes indicated by device structure ******************************/
static int ray_dev_close(struct net_device *dev);
static int ray_dev_config(struct net_device *dev, struct ifmap *map);
static struct net_device_stats *ray_get_stats(struct net_device *dev);
static int ray_dev_init(struct net_device *dev);
static int ray_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
static int ray_open(struct net_device *dev);
static int ray_dev_start_xmit(struct sk_buff *skb, struct net_device *dev);
static void set_multicast_list(struct net_device *dev);
static void ray_update_multi_list(struct net_device *dev, int all);
static int translate_frame(ray_dev_t *local, struct tx_msg *ptx,
                unsigned char *data, int len);
static void ray_build_header(ray_dev_t *local, struct tx_msg *ptx, UCHAR msg_type,
                unsigned char *data);
static void untranslate(ray_dev_t *local, struct sk_buff *skb, int len);
#if WIRELESS_EXT > 7	/* If wireless extension exist in the kernel */
static iw_stats * ray_get_wireless_stats(struct net_device *	dev);
#endif	/* WIRELESS_EXT > 7 */

/***** Prototypes for raylink functions **************************************/
static int asc_to_int(char a);
static void authenticate(ray_dev_t *local);
static int build_auth_frame(ray_dev_t *local, UCHAR *dest, int auth_type);
static void authenticate_timeout(u_long);
static int get_free_ccs(ray_dev_t *local);
static int get_free_tx_ccs(ray_dev_t *local);
static void init_startup_params(ray_dev_t *local);
static int parse_addr(char *in_str, UCHAR *out);
static int ray_hw_xmit(unsigned char* data, int len, struct net_device* dev, UCHAR type);
static int ray_init(struct net_device *dev);
static int interrupt_ecf(ray_dev_t *local, int ccs);
static void ray_reset(struct net_device *dev);
static void ray_update_parm(struct net_device *dev, UCHAR objid, UCHAR *value, int len);
static void verify_dl_startup(u_long);

/* Prototypes for interrpt time functions **********************************/
static void ray_interrupt (int reg, void *dev_id, struct pt_regs *regs);
static void clear_interrupt(ray_dev_t *local);
static void rx_deauthenticate(ray_dev_t *local, struct rcs *prcs, 
                       unsigned int pkt_addr, int rx_len);
static int copy_from_rx_buff(ray_dev_t *local, UCHAR *dest, int pkt_addr, int len);
static void ray_rx(struct net_device *dev, ray_dev_t *local, struct rcs *prcs);
static void release_frag_chain(ray_dev_t *local, struct rcs *prcs);
static void rx_authenticate(ray_dev_t *local, struct rcs *prcs,
                     unsigned int pkt_addr, int rx_len);
static void rx_data(struct net_device *dev, struct rcs *prcs, unsigned int pkt_addr, 
             int rx_len);
static void associate(ray_dev_t *local);

/* Card command functions */
static int dl_startup_params(struct net_device *dev);
static void join_net(u_long local);
static void start_net(u_long local);
/* void start_net(ray_dev_t *local); */

static int ray_cs_proc_read(char *, char **, off_t, int, int *, void *);
/* Create symbol table for registering with kernel in init_module */
#if (LINUX_VERSION_CODE <= VERSION(2,1,17))
static struct symbol_table ray_cs_syms = {
#include <linux/symtab_begin.h>
#undef X
#define X(sym) { (void *)&sym, SYMBOL_NAME_STR(sym) }
    X(ray_rx),
    X(ray_dev_ioctl),
#include <linux/symtab_end.h>
};
#else /* (kernel > 2.1.17) Use new kernel method of registering symbols */
EXPORT_SYMBOL(ray_dev_ioctl);
EXPORT_SYMBOL(ray_rx);
#endif

/*===========================================================================*/
/* Parameters that can be set with 'insmod' */
/* Bit map of interrupts to choose from */
/* This means pick from 15, 14, 12, 11, 10, 9, 7, 5, 4, and 3 */
static u_long irq_mask = 0xdeb8;

/* ADHOC=0, Infrastructure=1 */
static int net_type = ADHOC;

/* Hop dwell time in Kus (1024 us units defined by 802.11) */
static int hop_dwell = 128;

/* Beacon period in Kus */
static int beacon_period = 256;

/* power save mode (0 = off, 1 = save power) */
static int psm = 0;

/* String for network's Extended Service Set ID. 32 Characters max */
static char *essid = NULL;

/* Default to encapsulation unless translation requested */
static int translate = 1;

static int country = USA;

static int sniffer = 0;

static int bc = 0;

/* 48 bit physical card address if overriding card's real physical
 * address is required.  Since IEEE 802.11 addresses are 48 bits
 * like ethernet, an int can't be used, so a string is used. To
 * allow use of addresses starting with a decimal digit, the first
 * character must be a letter and will be ignored. This letter is
 * followed by up to 12 hex digits which are the address.  If less
 * than 12 digits are used, the address will be left filled with 0's.
 * Note that bit 0 of the first byte is the broadcast bit, and evil
 * things will happen if it is not 0 in a card address.
 */
static char *phy_addr = NULL;


/* The dev_info variable is the "key" that is used to match up this
   device driver with appropriate cards, through the card configuration
   database.
*/
static dev_info_t dev_info = "ray_cs";

/* A linked list of "instances" of the ray device.  Each actual
   PCMCIA card corresponds to one device instance, and is described
   by one dev_link_t structure (defined in ds.h).
*/
static dev_link_t *dev_list = NULL;

/* A dev_link_t structure has fields for most things that are needed
   to keep track of a socket, but there will usually be some device
   specific information that also needs to be kept track of.  The
   'priv' pointer in a dev_link_t structure can be used to point to
   a device-specific private data structure, like this.
*/
static unsigned int ray_mem_speed = 500;
MODULE_AUTHOR("Corey Thomas <[e-mail]>");
MODULE_DESCRIPTION("Raylink/WebGear wireless LAN driver");
MODULE_LICENSE("GPL");
MODULE_PARM(irq_mask,"i");
MODULE_PARM(net_type,"i");
MODULE_PARM(hop_dwell,"i");
MODULE_PARM(beacon_period,"i");
MODULE_PARM(psm,"i");
MODULE_PARM(essid,"s");
MODULE_PARM(translate,"i");
MODULE_PARM(country,"i");
MODULE_PARM(sniffer,"i");
MODULE_PARM(bc,"i");
MODULE_PARM(phy_addr,"s");
MODULE_PARM(ray_mem_speed, "i");

static UCHAR b5_default_startup_parms[] = {
    0,   0,                         /* Adhoc station */
   'L','I','N','U','X', 0,  0,  0,  /* 32 char ESSID */
    0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,
    1,  0,                          /* Active scan, CA Mode */
    0,  0,  0,  0,  0,  0,          /* No default MAC addr  */
    0x7f, 0xff,                     /* Frag threshold */
    0x00, 0x80,                     /* Hop time 128 Kus*/
    0x01, 0x00,                     /* Beacon period 256 Kus */
    0x01, 0x07, 0xa3,               /* DTIM, retries, ack timeout*/
    0x1d, 0x82, 0x4e,               /* SIFS, DIFS, PIFS */
    0x7f, 0xff,                     /* RTS threshold */
    0x04, 0xe2, 0x38, 0xA4,         /* scan_dwell, max_scan_dwell */
    0x05,                           /* assoc resp timeout thresh */
    0x08, 0x02, 0x08,               /* adhoc, infra, super cycle max*/
    0,                              /* Promiscuous mode */
    0x0c, 0x0bd,                    /* Unique word */
    0x32,                           /* Slot time */
    0xff, 0xff,                     /* roam-low snr, low snr count */
    0x05, 0xff,                     /* Infra, adhoc missed bcn thresh */
    0x01, 0x0b, 0x4f,               /* USA, hop pattern, hop pat length */
/* b4 - b5 differences start here */
    0x00, 0x3f,                     /* CW max */
    0x00, 0x0f,                     /* CW min */
    0x04, 0x08,                     /* Noise gain, limit offset */
    0x28, 0x28,                     /* det rssi, med busy offsets */
    7,                              /* det sync thresh */
    0, 2, 2,                        /* test mode, min, max */
    0,                              /* allow broadcast SSID probe resp */
    0, 0,                           /* privacy must start, can join */
    2, 0, 0, 0, 0, 0, 0, 0          /* basic rate set */
};

static UCHAR b4_default_startup_parms[] = {
    0,   0,                         /* Adhoc station */
   'L','I','N','U','X', 0,  0,  0,  /* 32 char ESSID */
    0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,
    1,  0,                          /* Active scan, CA Mode */
    0,  0,  0,  0,  0,  0,          /* No default MAC addr  */
    0x7f, 0xff,                     /* Frag threshold */
    0x02, 0x00,                     /* Hop time */
    0x00, 0x01,                     /* Beacon period */
    0x01, 0x07, 0xa3,               /* DTIM, retries, ack timeout*/
    0x1d, 0x82, 0xce,               /* SIFS, DIFS, PIFS */
    0x7f, 0xff,                     /* RTS threshold */
    0xfb, 0x1e, 0xc7, 0x5c,         /* scan_dwell, max_scan_dwell */
    0x05,                           /* assoc resp timeout thresh */
    0x04, 0x02, 0x4,                /* adhoc, infra, super cycle max*/
    0,                              /* Promiscuous mode */
    0x0c, 0x0bd,                    /* Unique word */
    0x4e,                           /* Slot time (TBD seems wrong)*/
    0xff, 0xff,                     /* roam-low snr, low snr count */
    0x05, 0xff,                     /* Infra, adhoc missed bcn thresh */
    0x01, 0x0b, 0x4e,               /* USA, hop pattern, hop pat length */
/* b4 - b5 differences start here */
    0x3f, 0x0f,                     /* CW max, min */
    0x04, 0x08,                     /* Noise gain, limit offset */
    0x28, 0x28,                     /* det rssi, med busy offsets */
    7,                              /* det sync thresh */
    0, 2, 2                         /* test mode, min, max*/
};
/*===========================================================================*/
static unsigned char eth2_llc[] = {0xaa, 0xaa, 3, 0, 0, 0};

static char hop_pattern_length[] = { 1,
	     USA_HOP_MOD,             EUROPE_HOP_MOD,
	     JAPAN_HOP_MOD,           KOREA_HOP_MOD,
	     SPAIN_HOP_MOD,           FRANCE_HOP_MOD,
	     ISRAEL_HOP_MOD,          AUSTRALIA_HOP_MOD,
	     JAPAN_TEST_HOP_MOD
};

static char rcsid[] = " ray_cs.c,v 1.33 2002/06/29 06:39:33 root Exp - Corey Thomas [e-mail]";

/*===========================================================================*/
static void cs_error(client_handle_t handle, int func, int ret)
{
    error_info_t err = { func, ret };
    CardServices(ReportError, handle, &err);
}
/*======================================================================

    This bit of code is used to avoid unregistering network devices
    at inappropriate times.  2.2 and later kernels are fairly picky
    about when this can happen.
    
======================================================================*/

static void flush_stale_links(void)
{
    dev_link_t *link, *next;
    for (link = dev_list; link; link = next) {
	next = link->next;
	if (link->state & DEV_STALE_LINK)
	    ray_detach(link);
    }
}

/*=============================================================================
    ray_attach() creates an "instance" of the driver, allocating
    local data structures for one device.  The device is registered
    with Card Services.
    The dev_link structure is initialized, but we don't actually
    configure the card at this point -- we wait until we receive a
    card insertion event.
=============================================================================*/
static dev_link_t *ray_attach(void)
{
    client_reg_t client_reg;
    dev_link_t *link;
    ray_dev_t *local;
    int ret;
    struct net_device *dev;
    
    DEBUG(1, "ray_attach()\n");
    flush_stale_links();

    /* Initialize the dev_link_t structure */
    link = kmalloc(sizeof(struct dev_link_t), GFP_KERNEL);
    if (link == NULL) return link;
    memset(link, 0, sizeof(struct dev_link_t));
    link->release.function = &ray_release;
    link->release.data = (u_long)link;

    /* The io structure describes IO port mapping. None used here */
    link->io.NumPorts1 = 0;
    link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
    link->io.IOAddrLines = 5;

    /* Interrupt setup. For PCMCIA, driver takes what's given */
    link->irq.Attributes = IRQ_TYPE_EXCLUSIVE | IRQ_HANDLE_PRESENT;
    link->irq.IRQInfo1 = IRQ_INFO2_VALID | IRQ_LEVEL_ID;
    link->irq.IRQInfo2 = irq_mask;