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path: root/drivers/net/wan/hdlc.c
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Diffstat (limited to 'drivers/net/wan/hdlc.c')
-rw-r--r--drivers/net/wan/hdlc.c160
1 files changed, 88 insertions, 72 deletions
diff --git a/drivers/net/wan/hdlc.c b/drivers/net/wan/hdlc.c
index db354e0edbe..9c33ca918e1 100644
--- a/drivers/net/wan/hdlc.c
+++ b/drivers/net/wan/hdlc.c
@@ -1,7 +1,7 @@
/*
* Generic HDLC support routines for Linux
*
- * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
+ * 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
@@ -22,30 +22,31 @@
* - proto->start() and stop() are called with spin_lock_irq held.
*/
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/poll.h>
+#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/skbuff.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
#include <linux/pkt_sched.h>
-#include <linux/inetdevice.h>
-#include <linux/lapb.h>
+#include <linux/poll.h>
#include <linux/rtnetlink.h>
-#include <linux/notifier.h>
-#include <linux/hdlc.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <net/net_namespace.h>
-static const char* version = "HDLC support module revision 1.20";
+static const char* version = "HDLC support module revision 1.22";
#undef DEBUG_LINK
-static struct hdlc_proto *first_proto = NULL;
-
+static struct hdlc_proto *first_proto;
-static int hdlc_change_mtu(struct net_device *dev, int new_mtu)
+int hdlc_change_mtu(struct net_device *dev, int new_mtu)
{
if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
return -EINVAL;
@@ -53,34 +54,35 @@ static int hdlc_change_mtu(struct net_device *dev, int new_mtu)
return 0;
}
-
-
-static struct net_device_stats *hdlc_get_stats(struct net_device *dev)
-{
- return hdlc_stats(dev);
-}
-
-
-
static int hdlc_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *p, struct net_device *orig_dev)
{
- struct hdlc_device_desc *desc = dev_to_desc(dev);
- if (desc->netif_rx)
- return desc->netif_rx(skb);
+ struct hdlc_device *hdlc = dev_to_hdlc(dev);
+
+ if (!net_eq(dev_net(dev), &init_net)) {
+ kfree_skb(skb);
+ return 0;
+ }
- desc->stats.rx_dropped++; /* Shouldn't happen */
- dev_kfree_skb(skb);
- return NET_RX_DROP;
+ 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)
- return hdlc->proto->start(dev);
+ hdlc->proto->start(dev);
}
@@ -89,7 +91,7 @@ static inline void hdlc_proto_stop(struct net_device *dev)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
if (hdlc->proto->stop)
- return hdlc->proto->stop(dev);
+ hdlc->proto->stop(dev);
}
@@ -97,16 +99,19 @@ static inline void hdlc_proto_stop(struct net_device *dev)
static int hdlc_device_event(struct notifier_block *this, unsigned long event,
void *ptr)
{
- struct net_device *dev = ptr;
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
hdlc_device *hdlc;
unsigned long flags;
int on;
-
- if (dev->get_stats != hdlc_get_stats)
+
+ 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 interrested in carrier changes */
+ return NOTIFY_DONE; /* Only interested in carrier changes */
on = netif_carrier_ok(dev);
@@ -127,10 +132,10 @@ static int hdlc_device_event(struct notifier_block *this, unsigned long event,
goto carrier_exit;
if (hdlc->carrier) {
- printk(KERN_INFO "%s: Carrier detected\n", dev->name);
+ netdev_info(dev, "Carrier detected\n");
hdlc_proto_start(dev);
} else {
- printk(KERN_INFO "%s: Carrier lost\n", dev->name);
+ netdev_info(dev, "Carrier lost\n");
hdlc_proto_stop(dev);
}
@@ -162,10 +167,10 @@ int hdlc_open(struct net_device *dev)
spin_lock_irq(&hdlc->state_lock);
if (hdlc->carrier) {
- printk(KERN_INFO "%s: Carrier detected\n", dev->name);
+ netdev_info(dev, "Carrier detected\n");
hdlc_proto_start(dev);
} else
- printk(KERN_INFO "%s: No carrier\n", dev->name);
+ netdev_info(dev, "No carrier\n");
hdlc->open = 1;
@@ -222,19 +227,27 @@ int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
return -EINVAL;
}
-void hdlc_setup(struct net_device *dev)
-{
- hdlc_device *hdlc = dev_to_hdlc(dev);
-
- dev->get_stats = hdlc_get_stats;
- dev->change_mtu = hdlc_change_mtu;
- dev->mtu = HDLC_MAX_MTU;
+static const struct header_ops hdlc_null_ops;
- dev->type = ARPHRD_RAWHDLC;
- dev->hard_header_len = 16;
+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;
+}
- dev->flags = IFF_POINTOPOINT | IFF_NOARP;
+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);
@@ -243,8 +256,7 @@ void hdlc_setup(struct net_device *dev)
struct net_device *alloc_hdlcdev(void *priv)
{
struct net_device *dev;
- dev = alloc_netdev(sizeof(struct hdlc_device_desc) +
- sizeof(hdlc_device), "hdlc%d", hdlc_setup);
+ dev = alloc_netdev(sizeof(struct hdlc_device), "hdlc%d", hdlc_setup);
if (dev)
dev_to_hdlc(dev)->priv = priv;
return dev;
@@ -261,23 +273,21 @@ void unregister_hdlc_device(struct net_device *dev)
int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto,
- int (*rx)(struct sk_buff *skb), size_t size)
+ 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) {
- printk(KERN_WARNING "Memory squeeze on"
- " hdlc_proto_attach()\n");
+ 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;
- dev_to_desc(dev)->netif_rx = rx;
return 0;
}
@@ -294,26 +304,31 @@ void detach_hdlc_protocol(struct net_device *dev)
}
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 = &first_proto;
- while (*p) {
- if (*p == proto) {
- *p = proto->next;
- return;
- }
+ struct hdlc_proto **p;
+
+ rtnl_lock();
+ p = &first_proto;
+ while (*p != proto) {
+ BUG_ON(!*p);
p = &((*p)->next);
}
+ *p = proto->next;
+ rtnl_unlock();
}
@@ -322,10 +337,11 @@ 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(hdlc_setup);
EXPORT_SYMBOL(alloc_hdlcdev);
EXPORT_SYMBOL(unregister_hdlc_device);
EXPORT_SYMBOL(register_hdlc_protocol);
@@ -333,14 +349,14 @@ EXPORT_SYMBOL(unregister_hdlc_protocol);
EXPORT_SYMBOL(attach_hdlc_protocol);
EXPORT_SYMBOL(detach_hdlc_protocol);
-static struct packet_type hdlc_packet_type = {
- .type = __constant_htons(ETH_P_HDLC),
+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,
+ .notifier_call = hdlc_device_event,
};
@@ -348,10 +364,10 @@ static int __init hdlc_module_init(void)
{
int result;
- printk(KERN_INFO "%s\n", version);
+ pr_info("%s\n", version);
if ((result = register_netdevice_notifier(&hdlc_notifier)) != 0)
- return result;
- dev_add_pack(&hdlc_packet_type);
+ return result;
+ dev_add_pack(&hdlc_packet_type);
return 0;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-06 11:40:18 +0000