--- /dev/null
+/*
+ * 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 = netdev_notifier_info_to_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",
+ NET_NAME_UNKNOWN, 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) {
+ dev_to_hdlc(dev)->state = kmalloc(size, GFP_KERNEL);
+ if (dev_to_hdlc(dev)->state == NULL) {
+ 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);
Code Review / kvmfornfv.git / blobdiff