/* * 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;		ppp_register_channel(channel);		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);	skb_reserve(skb, 2);	memcpy(skb_put(skb, length), 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);				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_sync(&network->work_go_online);	flush_work_sync(&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);

Lines 1–500 of 508. Load more