diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/net/wan/hdlc.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/net/wan/hdlc.c | 385 |
1 files changed, 0 insertions, 385 deletions
diff --git a/ANDROID_3.4.5/drivers/net/wan/hdlc.c b/ANDROID_3.4.5/drivers/net/wan/hdlc.c deleted file mode 100644 index 10cc7df9..00000000 --- a/ANDROID_3.4.5/drivers/net/wan/hdlc.c +++ /dev/null @@ -1,385 +0,0 @@ -/* - * Generic HDLC support routines for Linux - * - * Copyright (C) 1999 - 2008 Krzysztof Halasa <khc@pm.waw.pl> - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of version 2 of the GNU General Public License - * as published by the Free Software Foundation. - * - * Currently supported: - * * raw IP-in-HDLC - * * Cisco HDLC - * * Frame Relay with ANSI or CCITT LMI (both user and network side) - * * PPP - * * X.25 - * - * Use sethdlc utility to set line parameters, protocol and PVCs - * - * How does it work: - * - proto->open(), close(), start(), stop() calls are serialized. - * The order is: open, [ start, stop ... ] close ... - * - proto->start() and stop() are called with spin_lock_irq held. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/errno.h> -#include <linux/hdlc.h> -#include <linux/if_arp.h> -#include <linux/inetdevice.h> -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/notifier.h> -#include <linux/pkt_sched.h> -#include <linux/poll.h> -#include <linux/rtnetlink.h> -#include <linux/skbuff.h> -#include <linux/slab.h> -#include <net/net_namespace.h> - - -static const char* version = "HDLC support module revision 1.22"; - -#undef DEBUG_LINK - -static struct hdlc_proto *first_proto; - -int hdlc_change_mtu(struct net_device *dev, int new_mtu) -{ - if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU)) - return -EINVAL; - dev->mtu = new_mtu; - return 0; -} - -static int hdlc_rcv(struct sk_buff *skb, struct net_device *dev, - struct packet_type *p, struct net_device *orig_dev) -{ - struct hdlc_device *hdlc = dev_to_hdlc(dev); - - if (!net_eq(dev_net(dev), &init_net)) { - kfree_skb(skb); - return 0; - } - - BUG_ON(!hdlc->proto->netif_rx); - return hdlc->proto->netif_rx(skb); -} - -netdev_tx_t hdlc_start_xmit(struct sk_buff *skb, struct net_device *dev) -{ - hdlc_device *hdlc = dev_to_hdlc(dev); - - if (hdlc->proto->xmit) - return hdlc->proto->xmit(skb, dev); - - return hdlc->xmit(skb, dev); /* call hardware driver directly */ -} - -static inline void hdlc_proto_start(struct net_device *dev) -{ - hdlc_device *hdlc = dev_to_hdlc(dev); - if (hdlc->proto->start) - hdlc->proto->start(dev); -} - - - -static inline void hdlc_proto_stop(struct net_device *dev) -{ - hdlc_device *hdlc = dev_to_hdlc(dev); - if (hdlc->proto->stop) - hdlc->proto->stop(dev); -} - - - -static int hdlc_device_event(struct notifier_block *this, unsigned long event, - void *ptr) -{ - struct net_device *dev = ptr; - hdlc_device *hdlc; - unsigned long flags; - int on; - - if (!net_eq(dev_net(dev), &init_net)) - return NOTIFY_DONE; - - if (!(dev->priv_flags & IFF_WAN_HDLC)) - return NOTIFY_DONE; /* not an HDLC device */ - - if (event != NETDEV_CHANGE) - return NOTIFY_DONE; /* Only interested in carrier changes */ - - on = netif_carrier_ok(dev); - -#ifdef DEBUG_LINK - printk(KERN_DEBUG "%s: hdlc_device_event NETDEV_CHANGE, carrier %i\n", - dev->name, on); -#endif - - hdlc = dev_to_hdlc(dev); - spin_lock_irqsave(&hdlc->state_lock, flags); - - if (hdlc->carrier == on) - goto carrier_exit; /* no change in DCD line level */ - - hdlc->carrier = on; - - if (!hdlc->open) - goto carrier_exit; - - if (hdlc->carrier) { - netdev_info(dev, "Carrier detected\n"); - hdlc_proto_start(dev); - } else { - netdev_info(dev, "Carrier lost\n"); - hdlc_proto_stop(dev); - } - -carrier_exit: - spin_unlock_irqrestore(&hdlc->state_lock, flags); - return NOTIFY_DONE; -} - - - -/* Must be called by hardware driver when HDLC device is being opened */ -int hdlc_open(struct net_device *dev) -{ - hdlc_device *hdlc = dev_to_hdlc(dev); -#ifdef DEBUG_LINK - printk(KERN_DEBUG "%s: hdlc_open() carrier %i open %i\n", dev->name, - hdlc->carrier, hdlc->open); -#endif - - if (hdlc->proto == NULL) - return -ENOSYS; /* no protocol attached */ - - if (hdlc->proto->open) { - int result = hdlc->proto->open(dev); - if (result) - return result; - } - - spin_lock_irq(&hdlc->state_lock); - - if (hdlc->carrier) { - netdev_info(dev, "Carrier detected\n"); - hdlc_proto_start(dev); - } else - netdev_info(dev, "No carrier\n"); - - hdlc->open = 1; - - spin_unlock_irq(&hdlc->state_lock); - return 0; -} - - - -/* Must be called by hardware driver when HDLC device is being closed */ -void hdlc_close(struct net_device *dev) -{ - hdlc_device *hdlc = dev_to_hdlc(dev); -#ifdef DEBUG_LINK - printk(KERN_DEBUG "%s: hdlc_close() carrier %i open %i\n", dev->name, - hdlc->carrier, hdlc->open); -#endif - - spin_lock_irq(&hdlc->state_lock); - - hdlc->open = 0; - if (hdlc->carrier) - hdlc_proto_stop(dev); - - spin_unlock_irq(&hdlc->state_lock); - - if (hdlc->proto->close) - hdlc->proto->close(dev); -} - - - -int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) -{ - struct hdlc_proto *proto = first_proto; - int result; - - if (cmd != SIOCWANDEV) - return -EINVAL; - - if (dev_to_hdlc(dev)->proto) { - result = dev_to_hdlc(dev)->proto->ioctl(dev, ifr); - if (result != -EINVAL) - return result; - } - - /* Not handled by currently attached protocol (if any) */ - - while (proto) { - if ((result = proto->ioctl(dev, ifr)) != -EINVAL) - return result; - proto = proto->next; - } - return -EINVAL; -} - -static const struct header_ops hdlc_null_ops; - -static void hdlc_setup_dev(struct net_device *dev) -{ - /* Re-init all variables changed by HDLC protocol drivers, - * including ether_setup() called from hdlc_raw_eth.c. - */ - dev->flags = IFF_POINTOPOINT | IFF_NOARP; - dev->priv_flags = IFF_WAN_HDLC; - dev->mtu = HDLC_MAX_MTU; - dev->type = ARPHRD_RAWHDLC; - dev->hard_header_len = 16; - dev->addr_len = 0; - dev->header_ops = &hdlc_null_ops; -} - -static void hdlc_setup(struct net_device *dev) -{ - hdlc_device *hdlc = dev_to_hdlc(dev); - - hdlc_setup_dev(dev); - hdlc->carrier = 1; - hdlc->open = 0; - spin_lock_init(&hdlc->state_lock); -} - -struct net_device *alloc_hdlcdev(void *priv) -{ - struct net_device *dev; - dev = alloc_netdev(sizeof(struct hdlc_device), "hdlc%d", hdlc_setup); - if (dev) - dev_to_hdlc(dev)->priv = priv; - return dev; -} - -void unregister_hdlc_device(struct net_device *dev) -{ - rtnl_lock(); - unregister_netdevice(dev); - detach_hdlc_protocol(dev); - rtnl_unlock(); -} - - - -int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto, - size_t size) -{ - detach_hdlc_protocol(dev); - - if (!try_module_get(proto->module)) - return -ENOSYS; - - if (size) - if ((dev_to_hdlc(dev)->state = kmalloc(size, - GFP_KERNEL)) == NULL) { - netdev_warn(dev, - "Memory squeeze on hdlc_proto_attach()\n"); - module_put(proto->module); - return -ENOBUFS; - } - dev_to_hdlc(dev)->proto = proto; - return 0; -} - - -void detach_hdlc_protocol(struct net_device *dev) -{ - hdlc_device *hdlc = dev_to_hdlc(dev); - - if (hdlc->proto) { - if (hdlc->proto->detach) - hdlc->proto->detach(dev); - module_put(hdlc->proto->module); - hdlc->proto = NULL; - } - kfree(hdlc->state); - hdlc->state = NULL; - hdlc_setup_dev(dev); -} - - -void register_hdlc_protocol(struct hdlc_proto *proto) -{ - rtnl_lock(); - proto->next = first_proto; - first_proto = proto; - rtnl_unlock(); -} - - -void unregister_hdlc_protocol(struct hdlc_proto *proto) -{ - struct hdlc_proto **p; - - rtnl_lock(); - p = &first_proto; - while (*p != proto) { - BUG_ON(!*p); - p = &((*p)->next); - } - *p = proto->next; - rtnl_unlock(); -} - - - -MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); -MODULE_DESCRIPTION("HDLC support module"); -MODULE_LICENSE("GPL v2"); - -EXPORT_SYMBOL(hdlc_change_mtu); -EXPORT_SYMBOL(hdlc_start_xmit); -EXPORT_SYMBOL(hdlc_open); -EXPORT_SYMBOL(hdlc_close); -EXPORT_SYMBOL(hdlc_ioctl); -EXPORT_SYMBOL(alloc_hdlcdev); -EXPORT_SYMBOL(unregister_hdlc_device); -EXPORT_SYMBOL(register_hdlc_protocol); -EXPORT_SYMBOL(unregister_hdlc_protocol); -EXPORT_SYMBOL(attach_hdlc_protocol); -EXPORT_SYMBOL(detach_hdlc_protocol); - -static struct packet_type hdlc_packet_type __read_mostly = { - .type = cpu_to_be16(ETH_P_HDLC), - .func = hdlc_rcv, -}; - - -static struct notifier_block hdlc_notifier = { - .notifier_call = hdlc_device_event, -}; - - -static int __init hdlc_module_init(void) -{ - int result; - - pr_info("%s\n", version); - if ((result = register_netdevice_notifier(&hdlc_notifier)) != 0) - return result; - dev_add_pack(&hdlc_packet_type); - return 0; -} - - - -static void __exit hdlc_module_exit(void) -{ - dev_remove_pack(&hdlc_packet_type); - unregister_netdevice_notifier(&hdlc_notifier); -} - - -module_init(hdlc_module_init); -module_exit(hdlc_module_exit); |