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[PATCH] Modularize generic HDLC

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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>
This commit is contained in:
Krzysztof Halasa
2006-09-26 23:23:45 +02:00
committed by Jeff Garzik
parent c226951b93
commit eb2a2fd91f
11 changed files with 739 additions and 504 deletions
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77
drivers/net/wan/hdlc_ppp.c
View File

@@ -2,7 +2,7 @@
* Generic HDLC support routines for Linux
* Point-to-point protocol 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
@@ -22,6 +22,21 @@
#include <linux/lapb.h>
#include <linux/rtnetlink.h>
#include <linux/hdlc.h>
#include <net/syncppp.h>
struct ppp_state {
struct ppp_device pppdev;
struct ppp_device *syncppp_ptr;
int (*old_change_mtu)(struct net_device *dev, int new_mtu);
};
static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr);
static inline struct ppp_state* state(hdlc_device *hdlc)
{
return(struct ppp_state *)(hdlc->state);
}
static int ppp_open(struct net_device *dev)
@@ -30,16 +45,16 @@ static int ppp_open(struct net_device *dev)
void *old_ioctl;
int result;
dev->priv = &hdlc->state.ppp.syncppp_ptr;
hdlc->state.ppp.syncppp_ptr = &hdlc->state.ppp.pppdev;
hdlc->state.ppp.pppdev.dev = dev;
dev->priv = &state(hdlc)->syncppp_ptr;
state(hdlc)->syncppp_ptr = &state(hdlc)->pppdev;
state(hdlc)->pppdev.dev = dev;
old_ioctl = dev->do_ioctl;
hdlc->state.ppp.old_change_mtu = dev->change_mtu;
sppp_attach(&hdlc->state.ppp.pppdev);
state(hdlc)->old_change_mtu = dev->change_mtu;
sppp_attach(&state(hdlc)->pppdev);
/* sppp_attach nukes them. We don't need syncppp's ioctl */
dev->do_ioctl = old_ioctl;
hdlc->state.ppp.pppdev.sppp.pp_flags &= ~PP_CISCO;
state(hdlc)->pppdev.sppp.pp_flags &= ~PP_CISCO;
dev->type = ARPHRD_PPP;
result = sppp_open(dev);
if (result) {
@@ -59,7 +74,7 @@ static void ppp_close(struct net_device *dev)
sppp_close(dev);
sppp_detach(dev);
dev->rebuild_header = NULL;
dev->change_mtu = hdlc->state.ppp.old_change_mtu;
dev->change_mtu = state(hdlc)->old_change_mtu;
dev->mtu = HDLC_MAX_MTU;
dev->hard_header_len = 16;
}
@@ -73,13 +88,24 @@ static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev)
int hdlc_ppp_ioctl(struct net_device *dev, struct ifreq *ifr)
static struct hdlc_proto proto = {
.open = ppp_open,
.close = ppp_close,
.type_trans = ppp_type_trans,
.ioctl = ppp_ioctl,
.module = THIS_MODULE,
};
static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
int result;
switch (ifr->ifr_settings.type) {
case IF_GET_PROTO:
if (dev_to_hdlc(dev)->proto != &proto)
return -EINVAL;
ifr->ifr_settings.type = IF_PROTO_PPP;
return 0; /* return protocol only, no settable parameters */
@@ -96,13 +122,10 @@ int hdlc_ppp_ioctl(struct net_device *dev, struct ifreq *ifr)
if (result)
return result;
hdlc_proto_detach(hdlc);
memset(&hdlc->proto, 0, sizeof(hdlc->proto));
hdlc->proto.open = ppp_open;
hdlc->proto.close = ppp_close;
hdlc->proto.type_trans = ppp_type_trans;
hdlc->proto.id = IF_PROTO_PPP;
result = attach_hdlc_protocol(dev, &proto, NULL,
sizeof(struct ppp_state));
if (result)
return result;
dev->hard_start_xmit = hdlc->xmit;
dev->hard_header = NULL;
dev->type = ARPHRD_PPP;
@@ -113,3 +136,25 @@ int hdlc_ppp_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("PPP protocol support for generic HDLC");
MODULE_LICENSE("GPL v2");