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authorKrzysztof Halasa <khc@pm.waw.pl>2006-09-27 01:23:45 +0400
committerJeff Garzik <jeff@garzik.org>2006-09-27 01:40:24 +0400
commiteb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfb (patch)
tree1d910a9460b76fd85ed02e8b9131270e4977f6f7 /drivers/net/wan/hdlc_raw.c
parentc226951b93f7cd7c3a10b17384535b617bd43fd0 (diff)
downloadlinux-eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfb.tar.xz
[PATCH] Modularize generic HDLC
This patch enables building of individual WAN protocol support routines (parts of generic HDLC) as separate modules. All protocol-private definitions are moved from hdlc.h file to protocol drivers. User-space interface and interface between generic HDLC and underlying low-level HDLC drivers are unchanged. Signed-off-by: Krzysztof Halasa <khc@pm.waw.pl> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/net/wan/hdlc_raw.c')
-rw-r--r--drivers/net/wan/hdlc_raw.c50
1 files changed, 41 insertions, 9 deletions
diff --git a/drivers/net/wan/hdlc_raw.c b/drivers/net/wan/hdlc_raw.c
index f15aa6ba77f1..fe3cae5c6b9d 100644
--- a/drivers/net/wan/hdlc_raw.c
+++ b/drivers/net/wan/hdlc_raw.c
@@ -2,7 +2,7 @@
* Generic HDLC support routines for Linux
* HDLC support
*
- * Copyright (C) 1999 - 2003 Krzysztof Halasa <khc@pm.waw.pl>
+ * Copyright (C) 1999 - 2006 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
@@ -24,6 +24,8 @@
#include <linux/hdlc.h>
+static int raw_ioctl(struct net_device *dev, struct ifreq *ifr);
+
static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev)
{
return __constant_htons(ETH_P_IP);
@@ -31,7 +33,14 @@ static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev)
-int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr)
+static struct hdlc_proto proto = {
+ .type_trans = raw_type_trans,
+ .ioctl = raw_ioctl,
+ .module = THIS_MODULE,
+};
+
+
+static int raw_ioctl(struct net_device *dev, struct ifreq *ifr)
{
raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
const size_t size = sizeof(raw_hdlc_proto);
@@ -41,12 +50,14 @@ int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr)
switch (ifr->ifr_settings.type) {
case IF_GET_PROTO:
+ if (dev_to_hdlc(dev)->proto != &proto)
+ return -EINVAL;
ifr->ifr_settings.type = IF_PROTO_HDLC;
if (ifr->ifr_settings.size < size) {
ifr->ifr_settings.size = size; /* data size wanted */
return -ENOBUFS;
}
- if (copy_to_user(raw_s, &hdlc->state.raw_hdlc.settings, size))
+ if (copy_to_user(raw_s, hdlc->state, size))
return -EFAULT;
return 0;
@@ -71,12 +82,11 @@ int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr)
if (result)
return result;
- hdlc_proto_detach(hdlc);
- memcpy(&hdlc->state.raw_hdlc.settings, &new_settings, size);
- memset(&hdlc->proto, 0, sizeof(hdlc->proto));
-
- hdlc->proto.type_trans = raw_type_trans;
- hdlc->proto.id = IF_PROTO_HDLC;
+ result = attach_hdlc_protocol(dev, &proto, NULL,
+ sizeof(raw_hdlc_proto));
+ if (result)
+ return result;
+ memcpy(hdlc->state, &new_settings, size);
dev->hard_start_xmit = hdlc->xmit;
dev->hard_header = NULL;
dev->type = ARPHRD_RAWHDLC;
@@ -88,3 +98,25 @@ int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr)
return -EINVAL;
}
+
+
+static int __init mod_init(void)
+{
+ register_hdlc_protocol(&proto);
+ return 0;
+}
+
+
+
+static void __exit mod_exit(void)
+{
+ unregister_hdlc_protocol(&proto);
+}
+
+
+module_init(mod_init);
+module_exit(mod_exit);
+
+MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
+MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC");
+MODULE_LICENSE("GPL v2");