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#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 < 0) { 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 < 0) 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_obj(struct ppp_channel); 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_obj(struct ipw_network);
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;}