[mirror_ubuntu-artful-kernel.git] / drivers / tty / ipwireless / network.c

/*
 * IPWireless 3G PCMCIA Network Driver
 *
 * Original code
 *   by Stephen Blackheath <stephen@blacksapphire.com>,
 *      Ben Martel <benm@symmetric.co.nz>
 *
 * Copyrighted as follows:
 *   Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
 *
 * Various driver changes and rewrites, port to new kernels
 *   Copyright (C) 2006-2007 Jiri Kosina
 *
 * Misc code cleanups and updates
 *   Copyright (C) 2007 David Sterba
 */

#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/ppp_channel.h>
#include <linux/ppp_defs.h>
#include <linux/slab.h>
#include <linux/ppp-ioctl.h>
#include <linux/skbuff.h>

#include "network.h"
#include "hardware.h"
#include "main.h"
#include "tty.h"

#define MAX_ASSOCIATED_TTYS 2

#define SC_RCV_BITS     (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP)

struct ipw_network {
	/* Hardware context, used for calls to hardware layer. */
	struct ipw_hardware *hardware;
	/* Context for kernel 'generic_ppp' functionality */
	struct ppp_channel *ppp_channel;
	/* tty context connected with IPW console */
	struct ipw_tty *associated_ttys[NO_OF_IPW_CHANNELS][MAX_ASSOCIATED_TTYS];
	/* True if ppp needs waking up once we're ready to xmit */
	int ppp_blocked;
	/* Number of packets queued up in hardware module. */
	int outgoing_packets_queued;
	/* Spinlock to avoid interrupts during shutdown */
	spinlock_t lock;
	struct mutex close_lock;

	/* PPP ioctl data, not actually used anywere */
	unsigned int flags;
	unsigned int rbits;
	u32 xaccm[8];
	u32 raccm;
	int mru;

	int shutting_down;
	unsigned int ras_control_lines;

	struct work_struct work_go_online;
	struct work_struct work_go_offline;
};

static void notify_packet_sent(void *callback_data, unsigned int packet_length)
{
	struct ipw_network *network = callback_data;
	unsigned long flags;

	spin_lock_irqsave(&network->lock, flags);
	network->outgoing_packets_queued--;
	if (network->ppp_channel != NULL) {
		if (network->ppp_blocked) {
			network->ppp_blocked = 0;
			spin_unlock_irqrestore(&network->lock, flags);
			ppp_output_wakeup(network->ppp_channel);
			if (ipwireless_debug)
				printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
				       ": ppp unblocked\n");
		} else
			spin_unlock_irqrestore(&network->lock, flags);
	} else
		spin_unlock_irqrestore(&network->lock, flags);
}

/*
 * Called by the ppp system when it has a packet to send to the hardware.
 */
static int ipwireless_ppp_start_xmit(struct ppp_channel *ppp_channel,
				     struct sk_buff *skb)
{
	struct ipw_network *network = ppp_channel->private;
	unsigned long flags;

	spin_lock_irqsave(&network->lock, flags);
	if (network->outgoing_packets_queued < ipwireless_out_queue) {
		unsigned char *buf;
		static unsigned char header[] = {
			PPP_ALLSTATIONS, /* 0xff */
			PPP_UI,		 /* 0x03 */
		};
		int ret;

		network->outgoing_packets_queued++;
		spin_unlock_irqrestore(&network->lock, flags);

		/*
		 * If we have the requested amount of headroom in the skb we
		 * were handed, then we can add the header efficiently.
		 */
		if (skb_headroom(skb) >= 2) {
			memcpy(skb_push(skb, 2), header, 2);
			ret = ipwireless_send_packet(network->hardware,
					       IPW_CHANNEL_RAS, skb->data,
					       skb->len,
					       notify_packet_sent,
					       network);
			if (ret == -1) {
				skb_pull(skb, 2);
				return 0;
			}
		} else {
			/* Otherwise (rarely) we do it inefficiently. */
			buf = kmalloc(skb->len + 2, GFP_ATOMIC);
			if (!buf)
				return 0;
			memcpy(buf + 2, skb->data, skb->len);
			memcpy(buf, header, 2);
			ret = ipwireless_send_packet(network->hardware,
					       IPW_CHANNEL_RAS, buf,
					       skb->len + 2,
					       notify_packet_sent,
					       network);
			kfree(buf);
			if (ret == -1)
				return 0;
		}
		kfree_skb(skb);
		return 1;
	} else {
		/*
		 * Otherwise reject the packet, and flag that the ppp system
		 * needs to be unblocked once we are ready to send.
		 */
		network->ppp_blocked = 1;
		spin_unlock_irqrestore(&network->lock, flags);
		if (ipwireless_debug)
			printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": ppp blocked\n");
		return 0;
	}
}

/* Handle an ioctl call that has come in via ppp. (copy of ppp_async_ioctl() */
static int ipwireless_ppp_ioctl(struct ppp_channel *ppp_channel,
				unsigned int cmd, unsigned long arg)
{
	struct ipw_network *network = ppp_channel->private;
	int err, val;
	u32 accm[8];
	int __user *user_arg = (int __user *) arg;

	err = -EFAULT;
	switch (cmd) {
	case PPPIOCGFLAGS:
		val = network->flags | network->rbits;
		if (put_user(val, user_arg))
			break;
		err = 0;
		break;

	case PPPIOCSFLAGS:
		if (get_user(val, user_arg))
			break;
		network->flags = val & ~SC_RCV_BITS;
		network->rbits = val & SC_RCV_BITS;
		err = 0;
		break;

	case PPPIOCGASYNCMAP:
		if (put_user(network->xaccm[0], user_arg))
			break;
		err = 0;
		break;

	case PPPIOCSASYNCMAP:
		if (get_user(network->xaccm[0], user_arg))
			break;
		err = 0;
		break;

	case PPPIOCGRASYNCMAP:
		if (put_user(network->raccm, user_arg))
			break;
		err = 0;
		break;

	case PPPIOCSRASYNCMAP:
		if (get_user(network->raccm, user_arg))
			break;
		err = 0;
		break;

	case PPPIOCGXASYNCMAP:
		if (copy_to_user((void __user *) arg, network->xaccm,
					sizeof(network->xaccm)))
			break;
		err = 0;
		break;

	case PPPIOCSXASYNCMAP:
		if (copy_from_user(accm, (void __user *) arg, sizeof(accm)))
			break;
		accm[2] &= ~0x40000000U;	/* can't escape 0x5e */
		accm[3] |= 0x60000000U;	/* must escape 0x7d, 0x7e */
		memcpy(network->xaccm, accm, sizeof(network->xaccm));
		err = 0;
		break;

	case PPPIOCGMRU:
		if (put_user(network->mru, user_arg))
			break;
		err = 0;
		break;

	case PPPIOCSMRU:
		if (get_user(val, user_arg))
			break;
		if (val < PPP_MRU)
			val = PPP_MRU;
		network->mru = val;
		err = 0;
		break;

	default:
		err = -ENOTTY;
	}

	return err;
}

static const struct ppp_channel_ops ipwireless_ppp_channel_ops = {
	.start_xmit = ipwireless_ppp_start_xmit,
	.ioctl      = ipwireless_ppp_ioctl
};

static void do_go_online(struct work_struct *work_go_online)
{
	struct ipw_network *network =
		container_of(work_go_online, struct ipw_network,
				work_go_online);
	unsigned long flags;

	spin_lock_irqsave(&network->lock, flags);
	if (!network->ppp_channel) {
		struct ppp_channel *channel;

		spin_unlock_irqrestore(&network->lock, flags);
		channel = kzalloc(sizeof(struct ppp_channel), GFP_KERNEL);
		if (!channel) {
			printk(KERN_ERR IPWIRELESS_PCCARD_NAME
					": unable to allocate PPP channel\n");
			return;
		}
		channel->private = network;
		channel->mtu = 16384;	/* Wild guess */
		channel->hdrlen = 2;
		channel->ops = &ipwireless_ppp_channel_ops;

		network->flags = 0;
		network->rbits = 0;
		network->mru = PPP_MRU;
		memset(network->xaccm, 0, sizeof(network->xaccm));
		network->xaccm[0] = ~0U;
		network->xaccm[3] = 0x60000000U;
		network->raccm = ~0U;
		if (ppp_register_channel(channel) < 0) {
			printk(KERN_ERR IPWIRELESS_PCCARD_NAME
					": unable to register PPP channel\n");
			kfree(channel);
			return;
		}
		spin_lock_irqsave(&network->lock, flags);
		network->ppp_channel = channel;
	}
	spin_unlock_irqrestore(&network->lock, flags);
}

static void do_go_offline(struct work_struct *work_go_offline)
{
	struct ipw_network *network =
		container_of(work_go_offline, struct ipw_network,
				work_go_offline);
	unsigned long flags;

	mutex_lock(&network->close_lock);
	spin_lock_irqsave(&network->lock, flags);
	if (network->ppp_channel != NULL) {
		struct ppp_channel *channel = network->ppp_channel;

		network->ppp_channel = NULL;
		spin_unlock_irqrestore(&network->lock, flags);
		mutex_unlock(&network->close_lock);
		ppp_unregister_channel(channel);
	} else {
		spin_unlock_irqrestore(&network->lock, flags);
		mutex_unlock(&network->close_lock);
	}
}

void ipwireless_network_notify_control_line_change(struct ipw_network *network,
						   unsigned int channel_idx,
						   unsigned int control_lines,
						   unsigned int changed_mask)
{
	int i;

	if (channel_idx == IPW_CHANNEL_RAS)
		network->ras_control_lines = control_lines;

	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
		struct ipw_tty *tty =
			network->associated_ttys[channel_idx][i];

		/*
		 * If it's associated with a tty (other than the RAS channel
		 * when we're online), then send the data to that tty.  The RAS
		 * channel's data is handled above - it always goes through
		 * ppp_generic.
		 */
		if (tty)
			ipwireless_tty_notify_control_line_change(tty,
								  channel_idx,
								  control_lines,
								  changed_mask);
	}
}

/*
 * Some versions of firmware stuff packets with 0xff 0x03 (PPP: ALLSTATIONS, UI)
 * bytes, which are required on sent packet, but not always present on received
 * packets
 */
static struct sk_buff *ipw_packet_received_skb(unsigned char *data,
					       unsigned int length)
{
	struct sk_buff *skb;

	if (length > 2 && data[0] == PPP_ALLSTATIONS && data[1] == PPP_UI) {
		length -= 2;
		data += 2;
	}

	skb = dev_alloc_skb(length + 4);
	if (skb == NULL)
		return NULL;
	skb_reserve(skb, 2);
	skb_put_data(skb, data, length);

	return skb;
}

void ipwireless_network_packet_received(struct ipw_network *network,
					unsigned int channel_idx,
					unsigned char *data,
					unsigned int length)
{
	int i;
	unsigned long flags;

	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
		struct ipw_tty *tty = network->associated_ttys[channel_idx][i];

		if (!tty)
			continue;

		/*
		 * If it's associated with a tty (other than the RAS channel
		 * when we're online), then send the data to that tty.  The RAS
		 * channel's data is handled above - it always goes through
		 * ppp_generic.
		 */
		if (channel_idx == IPW_CHANNEL_RAS
				&& (network->ras_control_lines &
					IPW_CONTROL_LINE_DCD) != 0
				&& ipwireless_tty_is_modem(tty)) {
			/*
			 * If data came in on the RAS channel and this tty is
			 * the modem tty, and we are online, then we send it to
			 * the PPP layer.
			 */
			mutex_lock(&network->close_lock);
			spin_lock_irqsave(&network->lock, flags);
			if (network->ppp_channel != NULL) {
				struct sk_buff *skb;

				spin_unlock_irqrestore(&network->lock,
						flags);

				/* Send the data to the ppp_generic module. */
				skb = ipw_packet_received_skb(data, length);
				if (skb)
					ppp_input(network->ppp_channel, skb);
			} else
				spin_unlock_irqrestore(&network->lock,
						flags);
			mutex_unlock(&network->close_lock);
		}
		/* Otherwise we send it out the tty. */
		else
			ipwireless_tty_received(tty, data, length);
	}
}

struct ipw_network *ipwireless_network_create(struct ipw_hardware *hw)
{
	struct ipw_network *network =
		kzalloc(sizeof(struct ipw_network), GFP_ATOMIC);

	if (!network)
		return NULL;

	spin_lock_init(&network->lock);
	mutex_init(&network->close_lock);

	network->hardware = hw;

	INIT_WORK(&network->work_go_online, do_go_online);
	INIT_WORK(&network->work_go_offline, do_go_offline);

	ipwireless_associate_network(hw, network);

	return network;
}

void ipwireless_network_free(struct ipw_network *network)
{
	network->shutting_down = 1;

	ipwireless_ppp_close(network);
	flush_work(&network->work_go_online);
	flush_work(&network->work_go_offline);

	ipwireless_stop_interrupts(network->hardware);
	ipwireless_associate_network(network->hardware, NULL);

	kfree(network);
}

void ipwireless_associate_network_tty(struct ipw_network *network,
				      unsigned int channel_idx,
				      struct ipw_tty *tty)
{
	int i;

	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
		if (network->associated_ttys[channel_idx][i] == NULL) {
			network->associated_ttys[channel_idx][i] = tty;
			break;
		}
}

void ipwireless_disassociate_network_ttys(struct ipw_network *network,
					  unsigned int channel_idx)
{
	int i;

	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
		network->associated_ttys[channel_idx][i] = NULL;
}

void ipwireless_ppp_open(struct ipw_network *network)
{
	if (ipwireless_debug)
		printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": online\n");
	schedule_work(&network->work_go_online);
}

void ipwireless_ppp_close(struct ipw_network *network)
{
	/* Disconnect from the wireless network. */
	if (ipwireless_debug)
		printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": offline\n");
	schedule_work(&network->work_go_offline);
}

int ipwireless_ppp_channel_index(struct ipw_network *network)
{
	int ret = -1;
	unsigned long flags;

	spin_lock_irqsave(&network->lock, flags);
	if (network->ppp_channel != NULL)
		ret = ppp_channel_index(network->ppp_channel);
	spin_unlock_irqrestore(&network->lock, flags);

	return ret;
}

int ipwireless_ppp_unit_number(struct ipw_network *network)
{
	int ret = -1;
	unsigned long flags;

	spin_lock_irqsave(&network->lock, flags);
	if (network->ppp_channel != NULL)
		ret = ppp_unit_number(network->ppp_channel);
	spin_unlock_irqrestore(&network->lock, flags);

	return ret;
}

int ipwireless_ppp_mru(const struct ipw_network *network)
{
	return network->mru;
}
Commit	Line	Data
099dc4fb DS	1	/*
	2	* IPWireless 3G PCMCIA Network Driver
	3	*
	4	* Original code
	5	* by Stephen Blackheath <stephen@blacksapphire.com>,
	6	* Ben Martel <benm@symmetric.co.nz>
	7	*
	8	* Copyrighted as follows:
	9	* Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
	10	*
	11	* Various driver changes and rewrites, port to new kernels
	12	* Copyright (C) 2006-2007 Jiri Kosina
	13	*
	14	* Misc code cleanups and updates
	15	* Copyright (C) 2007 David Sterba
	16	*/
	17
	18	#include <linux/interrupt.h>
	19	#include <linux/kernel.h>
	20	#include <linux/mutex.h>
	21	#include <linux/netdevice.h>
	22	#include <linux/ppp_channel.h>
	23	#include <linux/ppp_defs.h>
5a0e3ad6	24	#include <linux/slab.h>
4b32da2b	25	#include <linux/ppp-ioctl.h>
099dc4fb DS	26	#include <linux/skbuff.h>
	27
	28	#include "network.h"
	29	#include "hardware.h"
	30	#include "main.h"
	31	#include "tty.h"
	32
099dc4fb DS	33	#define MAX_ASSOCIATED_TTYS 2
	34
	35	#define SC_RCV_BITS (SC_RCV_B7_1\|SC_RCV_B7_0\|SC_RCV_ODDP\|SC_RCV_EVNP)
	36
	37	struct ipw_network {
	38	/* Hardware context, used for calls to hardware layer. */
	39	struct ipw_hardware *hardware;
	40	/* Context for kernel 'generic_ppp' functionality */
	41	struct ppp_channel *ppp_channel;
	42	/* tty context connected with IPW console */
	43	struct ipw_tty *associated_ttys[NO_OF_IPW_CHANNELS][MAX_ASSOCIATED_TTYS];
	44	/* True if ppp needs waking up once we're ready to xmit */
	45	int ppp_blocked;
	46	/* Number of packets queued up in hardware module. */
	47	int outgoing_packets_queued;
	48	/* Spinlock to avoid interrupts during shutdown */
63c4dbd1	49	spinlock_t lock;
099dc4fb DS	50	struct mutex close_lock;
	51
	52	/* PPP ioctl data, not actually used anywere */
	53	unsigned int flags;
	54	unsigned int rbits;
	55	u32 xaccm[8];
	56	u32 raccm;
	57	int mru;
	58
	59	int shutting_down;
	60	unsigned int ras_control_lines;
	61
	62	struct work_struct work_go_online;
	63	struct work_struct work_go_offline;
	64	};
	65
099dc4fb DS	66	static void notify_packet_sent(void *callback_data, unsigned int packet_length)
	67	{
	68	struct ipw_network *network = callback_data;
	69	unsigned long flags;
	70
63c4dbd1	71	spin_lock_irqsave(&network->lock, flags);
099dc4fb DS	72	network->outgoing_packets_queued--;
	73	if (network->ppp_channel != NULL) {
	74	if (network->ppp_blocked) {
	75	network->ppp_blocked = 0;
63c4dbd1	76	spin_unlock_irqrestore(&network->lock, flags);
099dc4fb DS	77	ppp_output_wakeup(network->ppp_channel);
099dc4fb DS	78	if (ipwireless_debug)
bee9c7c0	79	printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
099dc4fb DS	80	": ppp unblocked\n");
099dc4fb DS	81	} else
63c4dbd1	82	spin_unlock_irqrestore(&network->lock, flags);
099dc4fb	83	} else
63c4dbd1	84	spin_unlock_irqrestore(&network->lock, flags);
099dc4fb DS	85	}
	86
	87	/*
	88	* Called by the ppp system when it has a packet to send to the hardware.
	89	*/
	90	static int ipwireless_ppp_start_xmit(struct ppp_channel *ppp_channel,
	91	struct sk_buff *skb)
	92	{
	93	struct ipw_network *network = ppp_channel->private;
	94	unsigned long flags;
	95
63c4dbd1	96	spin_lock_irqsave(&network->lock, flags);
2e713165	97	if (network->outgoing_packets_queued < ipwireless_out_queue) {
099dc4fb DS	98	unsigned char *buf;
	99	static unsigned char header[] = {
	100	PPP_ALLSTATIONS, /* 0xff */
	101	PPP_UI, /* 0x03 */
	102	};
	103	int ret;
	104
	105	network->outgoing_packets_queued++;
63c4dbd1	106	spin_unlock_irqrestore(&network->lock, flags);
099dc4fb DS	107
	108	/*
	109	* If we have the requested amount of headroom in the skb we
	110	* were handed, then we can add the header efficiently.
	111	*/
	112	if (skb_headroom(skb) >= 2) {
	113	memcpy(skb_push(skb, 2), header, 2);
	114	ret = ipwireless_send_packet(network->hardware,
	115	IPW_CHANNEL_RAS, skb->data,
	116	skb->len,
	117	notify_packet_sent,
	118	network);
	119	if (ret == -1) {
	120	skb_pull(skb, 2);
	121	return 0;
	122	}
	123	} else {
	124	/* Otherwise (rarely) we do it inefficiently. */
	125	buf = kmalloc(skb->len + 2, GFP_ATOMIC);
	126	if (!buf)
	127	return 0;
	128	memcpy(buf + 2, skb->data, skb->len);
	129	memcpy(buf, header, 2);
	130	ret = ipwireless_send_packet(network->hardware,
	131	IPW_CHANNEL_RAS, buf,
	132	skb->len + 2,
	133	notify_packet_sent,
	134	network);
	135	kfree(buf);
	136	if (ret == -1)
	137	return 0;
	138	}
	139	kfree_skb(skb);
	140	return 1;
	141	} else {
	142	/*
	143	* Otherwise reject the packet, and flag that the ppp system
	144	* needs to be unblocked once we are ready to send.
	145	*/
	146	network->ppp_blocked = 1;
63c4dbd1	147	spin_unlock_irqrestore(&network->lock, flags);
bee9c7c0 DS	148	if (ipwireless_debug)
bee9c7c0 DS	149	printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": ppp blocked\n");
099dc4fb DS	150	return 0;
	151	}
	152	}
	153
	154	/* Handle an ioctl call that has come in via ppp. (copy of ppp_async_ioctl() */
	155	static int ipwireless_ppp_ioctl(struct ppp_channel *ppp_channel,
	156	unsigned int cmd, unsigned long arg)
	157	{
	158	struct ipw_network *network = ppp_channel->private;
	159	int err, val;
	160	u32 accm[8];
	161	int __user user_arg = (int __user ) arg;
	162
	163	err = -EFAULT;
	164	switch (cmd) {
	165	case PPPIOCGFLAGS:
	166	val = network->flags \| network->rbits;
	167	if (put_user(val, user_arg))
	168	break;
	169	err = 0;
	170	break;
	171
	172	case PPPIOCSFLAGS:
	173	if (get_user(val, user_arg))
	174	break;
	175	network->flags = val & ~SC_RCV_BITS;
	176	network->rbits = val & SC_RCV_BITS;
	177	err = 0;
	178	break;
	179
	180	case PPPIOCGASYNCMAP:
	181	if (put_user(network->xaccm[0], user_arg))
	182	break;
	183	err = 0;
	184	break;
	185
	186	case PPPIOCSASYNCMAP:
	187	if (get_user(network->xaccm[0], user_arg))
	188	break;
	189	err = 0;
	190	break;
	191
	192	case PPPIOCGRASYNCMAP:
	193	if (put_user(network->raccm, user_arg))
	194	break;
	195	err = 0;
	196	break;
	197
	198	case PPPIOCSRASYNCMAP:
	199	if (get_user(network->raccm, user_arg))
	200	break;
	201	err = 0;
	202	break;
	203
	204	case PPPIOCGXASYNCMAP:
	205	if (copy_to_user((void __user *) arg, network->xaccm,
	206	sizeof(network->xaccm)))
	207	break;
	208	err = 0;
	209	break;
	210
	211	case PPPIOCSXASYNCMAP:
	212	if (copy_from_user(accm, (void __user *) arg, sizeof(accm)))
	213	break;
214	accm[2] &= ~0x40000000U; /* can't escape 0x5e */
215	accm[3] \|= 0x60000000U; /* must escape 0x7d, 0x7e */
216	memcpy(network->xaccm, accm, sizeof(network->xaccm));
217	err = 0;
218	break;
219
220	case PPPIOCGMRU:
221	if (put_user(network->mru, user_arg))
222	break;
223	err = 0;
224	break;
225
226	case PPPIOCSMRU:
227	if (get_user(val, user_arg))
228	break;
229	if (val < PPP_MRU)
230	val = PPP_MRU;
231	network->mru = val;
232	err = 0;
233	break;
234
235	default:
236	err = -ENOTTY;
237	}
238
239	return err;
240	}
241
d7100da0	242	static const struct ppp_channel_ops ipwireless_ppp_channel_ops = {
099dc4fb DS	243	.start_xmit = ipwireless_ppp_start_xmit,
	244	.ioctl = ipwireless_ppp_ioctl
	245	};
	246
	247	static void do_go_online(struct work_struct *work_go_online)
	248	{
	249	struct ipw_network *network =
	250	container_of(work_go_online, struct ipw_network,
	251	work_go_online);
	252	unsigned long flags;
	253
63c4dbd1	254	spin_lock_irqsave(&network->lock, flags);
099dc4fb DS	255	if (!network->ppp_channel) {
	256	struct ppp_channel *channel;
	257
63c4dbd1	258	spin_unlock_irqrestore(&network->lock, flags);
099dc4fb DS	259	channel = kzalloc(sizeof(struct ppp_channel), GFP_KERNEL);
	260	if (!channel) {
	261	printk(KERN_ERR IPWIRELESS_PCCARD_NAME
	262	": unable to allocate PPP channel\n");
	263	return;
	264	}
	265	channel->private = network;
	266	channel->mtu = 16384; /* Wild guess */
	267	channel->hdrlen = 2;
	268	channel->ops = &ipwireless_ppp_channel_ops;
	269
	270	network->flags = 0;
	271	network->rbits = 0;
	272	network->mru = PPP_MRU;
	273	memset(network->xaccm, 0, sizeof(network->xaccm));
	274	network->xaccm[0] = ~0U;
	275	network->xaccm[3] = 0x60000000U;
	276	network->raccm = ~0U;
b6abc904 AC	277	if (ppp_register_channel(channel) < 0) {
	278	printk(KERN_ERR IPWIRELESS_PCCARD_NAME
	279	": unable to register PPP channel\n");
	280	kfree(channel);
	281	return;
	282	}
63c4dbd1	283	spin_lock_irqsave(&network->lock, flags);
099dc4fb DS	284	network->ppp_channel = channel;
099dc4fb DS	285	}
63c4dbd1	286	spin_unlock_irqrestore(&network->lock, flags);
099dc4fb DS	287	}
	288
	289	static void do_go_offline(struct work_struct *work_go_offline)
	290	{
	291	struct ipw_network *network =
	292	container_of(work_go_offline, struct ipw_network,
	293	work_go_offline);
	294	unsigned long flags;
	295
	296	mutex_lock(&network->close_lock);
63c4dbd1	297	spin_lock_irqsave(&network->lock, flags);
099dc4fb DS	298	if (network->ppp_channel != NULL) {
	299	struct ppp_channel *channel = network->ppp_channel;
	300
	301	network->ppp_channel = NULL;
63c4dbd1	302	spin_unlock_irqrestore(&network->lock, flags);
099dc4fb DS	303	mutex_unlock(&network->close_lock);
	304	ppp_unregister_channel(channel);
	305	} else {
63c4dbd1	306	spin_unlock_irqrestore(&network->lock, flags);
099dc4fb DS	307	mutex_unlock(&network->close_lock);
	308	}
	309	}
	310
	311	void ipwireless_network_notify_control_line_change(struct ipw_network *network,
	312	unsigned int channel_idx,
	313	unsigned int control_lines,
	314	unsigned int changed_mask)
	315	{
	316	int i;
	317
	318	if (channel_idx == IPW_CHANNEL_RAS)
	319	network->ras_control_lines = control_lines;
	320
	321	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
	322	struct ipw_tty *tty =
	323	network->associated_ttys[channel_idx][i];
	324
	325	/*
	326	* If it's associated with a tty (other than the RAS channel
	327	* when we're online), then send the data to that tty. The RAS
	328	* channel's data is handled above - it always goes through
	329	* ppp_generic.
	330	*/
	331	if (tty)
	332	ipwireless_tty_notify_control_line_change(tty,
	333	channel_idx,
	334	control_lines,
	335	changed_mask);
	336	}
	337	}
	338
	339	/*
	340	* Some versions of firmware stuff packets with 0xff 0x03 (PPP: ALLSTATIONS, UI)
	341	* bytes, which are required on sent packet, but not always present on received
	342	* packets
	343	*/
	344	static struct sk_buff ipw_packet_received_skb(unsigned char data,
	345	unsigned int length)
	346	{
	347	struct sk_buff *skb;
	348
	349	if (length > 2 && data[0] == PPP_ALLSTATIONS && data[1] == PPP_UI) {
	350	length -= 2;
	351	data += 2;
	352	}
	353
	354	skb = dev_alloc_skb(length + 4);
d1519e23 AC	355	if (skb == NULL)
d1519e23 AC	356	return NULL;
099dc4fb	357	skb_reserve(skb, 2);
59ae1d12	358	skb_put_data(skb, data, length);
099dc4fb DS	359
	360	return skb;
	361	}
	362
	363	void ipwireless_network_packet_received(struct ipw_network *network,
	364	unsigned int channel_idx,
	365	unsigned char *data,
	366	unsigned int length)
	367	{
	368	int i;
	369	unsigned long flags;
	370
	371	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
	372	struct ipw_tty *tty = network->associated_ttys[channel_idx][i];
	373
a51f4124 DS	374	if (!tty)
	375	continue;
	376
099dc4fb DS	377	/*
	378	* If it's associated with a tty (other than the RAS channel
	379	* when we're online), then send the data to that tty. The RAS
	380	* channel's data is handled above - it always goes through
	381	* ppp_generic.
	382	*/
a51f4124	383	if (channel_idx == IPW_CHANNEL_RAS
099dc4fb DS	384	&& (network->ras_control_lines &
	385	IPW_CONTROL_LINE_DCD) != 0
	386	&& ipwireless_tty_is_modem(tty)) {
	387	/*
	388	* If data came in on the RAS channel and this tty is
	389	* the modem tty, and we are online, then we send it to
	390	* the PPP layer.
	391	*/
	392	mutex_lock(&network->close_lock);
63c4dbd1	393	spin_lock_irqsave(&network->lock, flags);
099dc4fb DS	394	if (network->ppp_channel != NULL) {
	395	struct sk_buff *skb;
	396
63c4dbd1	397	spin_unlock_irqrestore(&network->lock,
099dc4fb DS	398	flags);
	399
	400	/* Send the data to the ppp_generic module. */
	401	skb = ipw_packet_received_skb(data, length);
d1519e23 AC	402	if (skb)
d1519e23 AC	403	ppp_input(network->ppp_channel, skb);
099dc4fb	404	} else
63c4dbd1	405	spin_unlock_irqrestore(&network->lock,
099dc4fb DS	406	flags);
	407	mutex_unlock(&network->close_lock);
	408	}
	409	/* Otherwise we send it out the tty. */
	410	else
	411	ipwireless_tty_received(tty, data, length);
	412	}
	413	}
	414
	415	struct ipw_network ipwireless_network_create(struct ipw_hardware hw)
	416	{
	417	struct ipw_network *network =
	418	kzalloc(sizeof(struct ipw_network), GFP_ATOMIC);
	419
	420	if (!network)
	421	return NULL;
	422
63c4dbd1	423	spin_lock_init(&network->lock);
099dc4fb DS	424	mutex_init(&network->close_lock);
	425
	426	network->hardware = hw;
	427
	428	INIT_WORK(&network->work_go_online, do_go_online);
	429	INIT_WORK(&network->work_go_offline, do_go_offline);
	430
	431	ipwireless_associate_network(hw, network);
	432
	433	return network;
	434	}
	435
	436	void ipwireless_network_free(struct ipw_network *network)
	437	{
	438	network->shutting_down = 1;
	439
	440	ipwireless_ppp_close(network);
43829731 TH	441	flush_work(&network->work_go_online);
43829731 TH	442	flush_work(&network->work_go_offline);
099dc4fb DS	443
	444	ipwireless_stop_interrupts(network->hardware);
	445	ipwireless_associate_network(network->hardware, NULL);
	446
	447	kfree(network);
	448	}
	449
	450	void ipwireless_associate_network_tty(struct ipw_network *network,
	451	unsigned int channel_idx,
	452	struct ipw_tty *tty)
	453	{
	454	int i;
	455
	456	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
	457	if (network->associated_ttys[channel_idx][i] == NULL) {
	458	network->associated_ttys[channel_idx][i] = tty;
	459	break;
	460	}
	461	}
	462
	463	void ipwireless_disassociate_network_ttys(struct ipw_network *network,
	464	unsigned int channel_idx)
	465	{
	466	int i;
	467
	468	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
	469	network->associated_ttys[channel_idx][i] = NULL;
	470	}
	471
	472	void ipwireless_ppp_open(struct ipw_network *network)
	473	{
	474	if (ipwireless_debug)
	475	printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": online\n");
	476	schedule_work(&network->work_go_online);
	477	}
	478
	479	void ipwireless_ppp_close(struct ipw_network *network)
	480	{
	481	/* Disconnect from the wireless network. */
	482	if (ipwireless_debug)
	483	printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": offline\n");
	484	schedule_work(&network->work_go_offline);
	485	}
	486
	487	int ipwireless_ppp_channel_index(struct ipw_network *network)
	488	{
	489	int ret = -1;
	490	unsigned long flags;
	491
63c4dbd1	492	spin_lock_irqsave(&network->lock, flags);
099dc4fb DS	493	if (network->ppp_channel != NULL)
099dc4fb DS	494	ret = ppp_channel_index(network->ppp_channel);
63c4dbd1	495	spin_unlock_irqrestore(&network->lock, flags);
099dc4fb DS	496
	497	return ret;
	498	}
	499
	500	int ipwireless_ppp_unit_number(struct ipw_network *network)
	501	{
	502	int ret = -1;
	503	unsigned long flags;
	504
63c4dbd1	505	spin_lock_irqsave(&network->lock, flags);
099dc4fb DS	506	if (network->ppp_channel != NULL)
099dc4fb DS	507	ret = ppp_unit_number(network->ppp_channel);
63c4dbd1	508	spin_unlock_irqrestore(&network->lock, flags);
099dc4fb DS	509
	510	return ret;
	511	}
a0138692 DS	512
	513	int ipwireless_ppp_mru(const struct ipw_network *network)
	514	{
	515	return network->mru;
	516	}