2 * Generic HDLC support routines for Linux
3 * Point-to-point protocol support
5 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of version 2 of the GNU General Public License
9 * as published by the Free Software Foundation.
12 #include <linux/errno.h>
13 #include <linux/hdlc.h>
14 #include <linux/if_arp.h>
15 #include <linux/inetdevice.h>
16 #include <linux/init.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/pkt_sched.h>
20 #include <linux/poll.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/skbuff.h>
23 #include <linux/slab.h>
24 #include <net/syncppp.h>
27 struct ppp_device pppdev
;
28 struct ppp_device
*syncppp_ptr
;
29 int (*old_change_mtu
)(struct net_device
*dev
, int new_mtu
);
32 static int ppp_ioctl(struct net_device
*dev
, struct ifreq
*ifr
);
35 static inline struct ppp_state
* state(hdlc_device
*hdlc
)
37 return(struct ppp_state
*)(hdlc
->state
);
41 static int ppp_open(struct net_device
*dev
)
43 hdlc_device
*hdlc
= dev_to_hdlc(dev
);
44 int (*old_ioctl
)(struct net_device
*, struct ifreq
*, int);
47 dev
->ml_priv
= &state(hdlc
)->syncppp_ptr
;
48 state(hdlc
)->syncppp_ptr
= &state(hdlc
)->pppdev
;
49 state(hdlc
)->pppdev
.dev
= dev
;
51 old_ioctl
= dev
->do_ioctl
;
52 state(hdlc
)->old_change_mtu
= dev
->change_mtu
;
53 sppp_attach(&state(hdlc
)->pppdev
);
54 /* sppp_attach nukes them. We don't need syncppp's ioctl */
55 dev
->do_ioctl
= old_ioctl
;
56 state(hdlc
)->pppdev
.sppp
.pp_flags
&= ~PP_CISCO
;
57 dev
->type
= ARPHRD_PPP
;
58 result
= sppp_open(dev
);
69 static void ppp_close(struct net_device
*dev
)
71 hdlc_device
*hdlc
= dev_to_hdlc(dev
);
76 dev
->change_mtu
= state(hdlc
)->old_change_mtu
;
77 dev
->mtu
= HDLC_MAX_MTU
;
78 dev
->hard_header_len
= 16;
83 static __be16
ppp_type_trans(struct sk_buff
*skb
, struct net_device
*dev
)
85 return __constant_htons(ETH_P_WAN_PPP
);
90 static struct hdlc_proto proto
= {
93 .type_trans
= ppp_type_trans
,
95 .module
= THIS_MODULE
,
99 static int ppp_ioctl(struct net_device
*dev
, struct ifreq
*ifr
)
101 hdlc_device
*hdlc
= dev_to_hdlc(dev
);
104 switch (ifr
->ifr_settings
.type
) {
106 if (dev_to_hdlc(dev
)->proto
!= &proto
)
108 ifr
->ifr_settings
.type
= IF_PROTO_PPP
;
109 return 0; /* return protocol only, no settable parameters */
112 if(!capable(CAP_NET_ADMIN
))
115 if(dev
->flags
& IFF_UP
)
118 /* no settable parameters */
120 result
=hdlc
->attach(dev
, ENCODING_NRZ
,PARITY_CRC16_PR1_CCITT
);
124 result
= attach_hdlc_protocol(dev
, &proto
,
125 sizeof(struct ppp_state
));
128 dev
->hard_start_xmit
= hdlc
->xmit
;
129 dev
->type
= ARPHRD_PPP
;
130 netif_dormant_off(dev
);
138 static int __init
mod_init(void)
140 register_hdlc_protocol(&proto
);
146 static void __exit
mod_exit(void)
148 unregister_hdlc_protocol(&proto
);
152 module_init(mod_init
);
153 module_exit(mod_exit
);
155 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
156 MODULE_DESCRIPTION("PPP protocol support for generic HDLC");
157 MODULE_LICENSE("GPL v2");
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