ieee80211_linux.c

Linux下wifi实现

	if (pv->rbuf)
		vfree(pv->rbuf);
	if (pv->wbuf)
		vfree(pv->wbuf);
	kfree(pv);
	return 0;
}

static struct file_operations proc_ieee80211_ops = {
        .read = proc_ieee80211_read,
        .write = proc_ieee80211_write,
        .open = proc_ieee80211_open,
        .release = proc_ieee80211_close,
};

#ifdef IEEE80211_DEBUG
static int
IEEE80211_SYSCTL_DECL(ieee80211_sysctl_debug, ctl, write, filp, buffer,
	lenp, ppos)
{
	struct ieee80211vap *vap = ctl->extra1;
	u_int val;
	int ret;

	ctl->data = &val;
	ctl->maxlen = sizeof(val);
	if (write) {
		ret = IEEE80211_SYSCTL_PROC_DOINTVEC(ctl, write, filp, buffer,
			lenp, ppos);
		if (ret == 0)
			vap->iv_debug = val;
	} else {
		val = vap->iv_debug;
		ret = IEEE80211_SYSCTL_PROC_DOINTVEC(ctl, write, filp, buffer,
			lenp, ppos);
	}
	return ret;
}
#endif /* IEEE80211_DEBUG */

static int
IEEE80211_SYSCTL_DECL(ieee80211_sysctl_dev_type, ctl, write, filp, buffer,
	lenp, ppos)
{
	struct ieee80211vap *vap = ctl->extra1;
	u_int val;
	int ret;

	ctl->data = &val;
	ctl->maxlen = sizeof(val);
	if (write) {
		ret = IEEE80211_SYSCTL_PROC_DOINTVEC(ctl, write, filp, buffer,
			lenp, ppos);
		if (ret == 0 && vap->iv_opmode == IEEE80211_M_MONITOR) {
			if (val == ARPHRD_IEEE80211_RADIOTAP ||
			    val == ARPHRD_IEEE80211 ||
			    val == ARPHRD_IEEE80211_PRISM ||
			    val == ARPHRD_IEEE80211_ATHDESC) {
				vap->iv_dev->type = val;
			}
		}
	} else {
		val = vap->iv_dev->type;
		ret = IEEE80211_SYSCTL_PROC_DOINTVEC(ctl, write, filp, buffer,
			lenp, ppos);
	}
	return ret;
}
static int
IEEE80211_SYSCTL_DECL(ieee80211_sysctl_monitor_nods_only, ctl, write, filp, buffer,
	lenp, ppos)
{
	struct ieee80211vap *vap = ctl->extra1;
	u_int val;
	int ret;

	ctl->data = &val;
	ctl->maxlen = sizeof(val);
	if (write) {
		ret = IEEE80211_SYSCTL_PROC_DOINTVEC(ctl, write, filp, buffer,
			lenp, ppos);
		if (ret == 0)
			vap->iv_monitor_nods_only = val;
	} else {
		val = vap->iv_monitor_nods_only;
		ret = IEEE80211_SYSCTL_PROC_DOINTVEC(ctl, write, filp, buffer,
			lenp, ppos);
	}
	return ret;
}
static int
IEEE80211_SYSCTL_DECL(ieee80211_sysctl_monitor_txf_len, ctl, write, filp, buffer,
	lenp, ppos)
{
	struct ieee80211vap *vap = ctl->extra1;
	u_int val;
	int ret;

	ctl->data = &val;
	ctl->maxlen = sizeof(val);
	if (write) {
		ret = IEEE80211_SYSCTL_PROC_DOINTVEC(ctl, write, filp, buffer,
			lenp, ppos);
		if (ret == 0)
			vap->iv_monitor_txf_len = val;
	} else {
		val = vap->iv_monitor_txf_len;
		ret = IEEE80211_SYSCTL_PROC_DOINTVEC(ctl, write, filp, buffer,
			lenp, ppos);
	}
	return ret;
}

#define	CTL_AUTO	-2	/* cannot be CTL_ANY or CTL_NONE */

static const ctl_table ieee80211_sysctl_template[] = {
#ifdef IEEE80211_DEBUG
	{ .ctl_name	= CTL_AUTO,
	  .procname	= "debug",
	  .mode		= 0644,
	  .proc_handler	= ieee80211_sysctl_debug
	},
#endif
	{ .ctl_name	= CTL_AUTO,
	  .procname	= "dev_type",
	  .mode		= 0644,
	  .proc_handler	= ieee80211_sysctl_dev_type
	},
	{ .ctl_name	= CTL_AUTO,
	  .procname	= "monitor_nods_only",
	  .mode		= 0644,
	  .proc_handler	= ieee80211_sysctl_monitor_nods_only
	},
	{ .ctl_name	= CTL_AUTO,
	  .procname	= "monitor_txf_len",
	  .mode		= 0644,
	  .proc_handler	= ieee80211_sysctl_monitor_txf_len
	},
	/* NB: must be last entry before NULL */
	{ .ctl_name	= CTL_AUTO,
	  .procname	= "%parent",
	  .maxlen	= IFNAMSIZ,
	  .mode		= 0444,
	  .proc_handler	= proc_dostring
	},
	{ 0 }
};

void
ieee80211_sysctl_vattach(struct ieee80211vap *vap)
{
	int i, space;
	char *devname = NULL;
	struct ieee80211_proc_entry *tmp=NULL;
	
	space = 5 * sizeof(struct ctl_table) + sizeof(ieee80211_sysctl_template);
	vap->iv_sysctls = kmalloc(space, GFP_KERNEL);
	if (vap->iv_sysctls == NULL) {
		printk("%s: no memory for sysctl table!\n", __func__);
		return;
	}

	/*
	 * Reserve space for the device name outside the net_device structure
	 * so that if the name changes we know what it used to be. 
	 */
	devname = kmalloc((strlen(vap->iv_dev->name) + 1) * sizeof(char), GFP_KERNEL);
	if (devname == NULL) {
		printk("%s: no memory for VAP name!\n", __func__);
		return;
	}
	strncpy(devname, vap->iv_dev->name, strlen(vap->iv_dev->name) + 1);

	/* setup the table */
	memset(vap->iv_sysctls, 0, space);
	vap->iv_sysctls[0].ctl_name = CTL_NET;
	vap->iv_sysctls[0].procname = "net";
	vap->iv_sysctls[0].mode = 0555;
	vap->iv_sysctls[0].child = &vap->iv_sysctls[2];
	/* [1] is NULL terminator */
	vap->iv_sysctls[2].ctl_name = CTL_AUTO;
	vap->iv_sysctls[2].procname = devname; /* XXX bad idea? */
	vap->iv_sysctls[2].mode = 0555;
	vap->iv_sysctls[2].child = &vap->iv_sysctls[4];
	/* [3] is NULL terminator */
	/* copy in pre-defined data */
	memcpy(&vap->iv_sysctls[4], ieee80211_sysctl_template,
		sizeof(ieee80211_sysctl_template));

	/* add in dynamic data references */
	for (i = 4; vap->iv_sysctls[i].ctl_name; i++)
		if (vap->iv_sysctls[i].extra1 == NULL)
			vap->iv_sysctls[i].extra1 = vap;

	/* tack on back-pointer to parent device */
	vap->iv_sysctls[i-1].data = vap->iv_ic->ic_dev->name;	/* XXX? */

	/* and register everything */
	vap->iv_sysctl_header = register_sysctl_table(vap->iv_sysctls, 1);
	if (!vap->iv_sysctl_header) {
		printk("%s: failed to register sysctls!\n", vap->iv_dev->name);
		kfree(vap->iv_sysctls);
		vap->iv_sysctls = NULL;
	}

	/* Ensure the base madwifi directory exists */
	if (!proc_madwifi && proc_net != NULL) {
		proc_madwifi = proc_mkdir("madwifi", proc_net);
		if (!proc_madwifi)
			printk(KERN_WARNING "Failed to mkdir /proc/net/madwifi\n");
	}

	/* Create a proc directory named after the VAP */
	if (proc_madwifi) {
		proc_madwifi_count++;
		vap->iv_proc = proc_mkdir(vap->iv_dev->name, proc_madwifi);
	}
	
	/* Create a proc entry listing the associated stations */
	ieee80211_proc_vcreate(vap, &proc_ieee80211_ops, "associated_sta");

	/* Recreate any other proc entries that have been registered */
		if (vap->iv_proc) {
		tmp = vap->iv_proc_entries;
		while (tmp) {
			if (!tmp->entry) {
				tmp->entry = create_proc_entry(tmp->name, 
				PROC_IEEE80211_PERM, vap->iv_proc);
				tmp->entry->data = vap;
				tmp->entry->proc_fops = tmp->fileops;
			}
			tmp = tmp->next;
		}
	}
}

/* Frees all memory used for the list of proc entries */
void 
ieee80211_proc_cleanup(struct ieee80211vap *vap)
{
	struct ieee80211_proc_entry *tmp=vap->iv_proc_entries;
	struct ieee80211_proc_entry *next = NULL;
	while (tmp) {
		next = tmp->next;
		kfree(tmp);
		tmp = next;
	}
}

/* Called by other modules to register a proc entry under the vap directory */
int 
ieee80211_proc_vcreate(struct ieee80211vap *vap, 
		struct file_operations *fileops, char *name)
{
	struct ieee80211_proc_entry *entry;
	struct ieee80211_proc_entry *tmp=NULL;

	/* Ignore if already in the list */
	if (vap->iv_proc_entries) {
		tmp = vap->iv_proc_entries;
		do {
			if (strcmp(tmp->name, name)==0)
				return -1;
			/* Check for end of list */
			if (!tmp->next)
				break;
			/* Otherwise move on */
			tmp = tmp->next;
		} while (1);
	}
	
	/* Create an item in our list for the new entry */
	entry = kmalloc(sizeof(struct ieee80211_proc_entry), GFP_KERNEL);
	if (entry == NULL) {
		printk("%s: no memory for new proc entry (%s)!\n", __func__, 
				name);
		return -1;
	}

	/* Replace null fileops pointers with our standard functions */
	if (!fileops->open)
		fileops->open = proc_ieee80211_open;
	if (!fileops->release)
		fileops->release = proc_ieee80211_close;
	if (!fileops->read)
		fileops->read = proc_ieee80211_read;
	if (!fileops->write)
		fileops->write = proc_ieee80211_write;
	
	/* Create the entry record */
	entry->name = name;
	entry->fileops = fileops;
	entry->next = NULL;
	entry->entry = NULL;

	/* Create the actual proc entry */
	if (vap->iv_proc) {
		entry->entry = create_proc_entry(entry->name, 
				PROC_IEEE80211_PERM, vap->iv_proc);
		entry->entry->data = vap;
		entry->entry->proc_fops = entry->fileops;
	}

	/* Add it to the list */
	if (!tmp) {
		/* Add to the start */
		vap->iv_proc_entries = entry;
	} else {
		/* Add to the end */
		tmp->next = entry;
	}

	return 0;
}
EXPORT_SYMBOL(ieee80211_proc_vcreate);

void
ieee80211_sysctl_vdetach(struct ieee80211vap *vap)
{
	struct ieee80211_proc_entry *tmp=NULL;

	if (vap->iv_sysctl_header) {
		unregister_sysctl_table(vap->iv_sysctl_header);
		vap->iv_sysctl_header = NULL;
	}

	if (vap->iv_proc) {
		/* Remove child proc entries but leave them in the list */
		tmp = vap->iv_proc_entries;
		while (tmp) {
			if (tmp->entry) {
				remove_proc_entry(tmp->name, vap->iv_proc);
				tmp->entry = NULL;
			}
			tmp = tmp->next;
		}
		remove_proc_entry(vap->iv_proc->name, proc_madwifi);
		if (proc_madwifi_count == 1) {
			remove_proc_entry("madwifi", proc_net);
			proc_madwifi = NULL;
		}
		proc_madwifi_count--;
	}

	if (vap->iv_sysctls[2].procname) {
		kfree(vap->iv_sysctls[2].procname);
		vap->iv_sysctls[2].procname = NULL;
	}
	
	if (vap->iv_sysctls) {
		kfree(vap->iv_sysctls);
		vap->iv_sysctls = NULL;
	}
}
#endif /* CONFIG_SYSCTL */

/*
 * Format an Ethernet MAC for printing.
 */
const char*
ether_sprintf(const u_int8_t *mac)
{
	static char etherbuf[18]; 	/* XXX */
	snprintf(etherbuf, sizeof(etherbuf), "%02x:%02x:%02x:%02x:%02x:%02x",
		mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
	return etherbuf;
}
EXPORT_SYMBOL(ether_sprintf);		/* XXX */

/* Function to handle the device event notifications.
 * If the event is a NETDEV_CHANGENAME, and is for an interface
 * we are taking care of, then we want to remove its existing 
 * proc entries (which now have the wrong names) and add
 * new, correct, entries.
 */
static int
ieee80211_rcv_dev_event(struct notifier_block *this, unsigned long event,
	void *ptr)
{
#ifdef CONFIG_SYSCTL
	struct net_device *dev = (struct net_device *) ptr;
	if (!dev || dev->open != &ieee80211_open)
		return 0;

        switch (event) {
        case NETDEV_CHANGENAME:
		ieee80211_sysctl_vdetach(dev->priv);
		ieee80211_sysctl_vattach(dev->priv);
		return NOTIFY_DONE;
	default:
		break;
        }
#endif /* CONFIG_SYSCTL */
        return 0;
}

static struct notifier_block ieee80211_event_block = {
        .notifier_call = ieee80211_rcv_dev_event
};

/*
 * Module glue.
 */
#include "version.h"
#include "release.h"
static char *version = WLAN_VERSION " (" RELEASE_VERSION ")";
static char *dev_info = "wlan";

MODULE_AUTHOR("Errno Consulting, Sam Leffler");
MODULE_DESCRIPTION("802.11 wireless LAN protocol support");
#ifdef MODULE_VERSION
MODULE_VERSION(RELEASE_VERSION);
#endif
#ifdef MODULE_LICENSE
MODULE_LICENSE("Dual BSD/GPL");
#endif

extern	void ieee80211_auth_setup(void);

static int __init
init_wlan(void)
{
  	register_netdevice_notifier(&ieee80211_event_block);
	printk(KERN_INFO "%s: %s\n", dev_info, version);
	return 0;
}
module_init(init_wlan);

static void __exit
exit_wlan(void)
{
  	unregister_netdevice_notifier(&ieee80211_event_block);
	printk(KERN_INFO "%s: driver unloaded\n", dev_info);
}
module_exit(exit_wlan);