hdlc_ppp.c revision 4bc83b4d409edacb33db6c71d03e963d9728476c 
1/*
2 * Generic HDLC support routines for Linux
3 * Point-to-point protocol support
4 *
5 * Copyright (C) 1999 - 2003 Krzysztof Halasa <khc@pm.waw.pl>
6 *
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.
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/poll.h>
16#include <linux/errno.h>
17#include <linux/if_arp.h>
18#include <linux/init.h>
19#include <linux/skbuff.h>
20#include <linux/pkt_sched.h>
21#include <linux/inetdevice.h>
22#include <linux/lapb.h>
23#include <linux/rtnetlink.h>
24#include <linux/hdlc.h>
25
26
27static int ppp_open(struct net_device *dev)
28{
29	hdlc_device *hdlc = dev_to_hdlc(dev);
30	void *old_ioctl;
31	int result;
32
33	dev->priv = &hdlc->state.ppp.syncppp_ptr;
34	hdlc->state.ppp.syncppp_ptr = &hdlc->state.ppp.pppdev;
35	hdlc->state.ppp.pppdev.dev = dev;
36
37	old_ioctl = dev->do_ioctl;
38	hdlc->state.ppp.old_change_mtu = dev->change_mtu;
39	sppp_attach(&hdlc->state.ppp.pppdev);
40	/* sppp_attach nukes them. We don't need syncppp's ioctl */
41	dev->do_ioctl = old_ioctl;
42	hdlc->state.ppp.pppdev.sppp.pp_flags &= ~PP_CISCO;
43	dev->type = ARPHRD_PPP;
44	result = sppp_open(dev);
45	if (result) {
46		sppp_detach(dev);
47		return result;
48	}
49
50	return 0;
51}
52
53
54
55static void ppp_close(struct net_device *dev)
56{
57	hdlc_device *hdlc = dev_to_hdlc(dev);
58
59	sppp_close(dev);
60	sppp_detach(dev);
61	dev->rebuild_header = NULL;
62	dev->change_mtu = hdlc->state.ppp.old_change_mtu;
63	dev->mtu = HDLC_MAX_MTU;
64	dev->hard_header_len = 16;
65}
66
67
68
69static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev)
70{
71	return __constant_htons(ETH_P_WAN_PPP);
72}
73
74
75
76int hdlc_ppp_ioctl(struct net_device *dev, struct ifreq *ifr)
77{
78	hdlc_device *hdlc = dev_to_hdlc(dev);
79	int result;
80
81	switch (ifr->ifr_settings.type) {
82	case IF_GET_PROTO:
83		ifr->ifr_settings.type = IF_PROTO_PPP;
84		return 0; /* return protocol only, no settable parameters */
85
86	case IF_PROTO_PPP:
87		if(!capable(CAP_NET_ADMIN))
88			return -EPERM;
89
90		if(dev->flags & IFF_UP)
91			return -EBUSY;
92
93		/* no settable parameters */
94
95		result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
96		if (result)
97			return result;
98
99		hdlc_proto_detach(hdlc);
100		memset(&hdlc->proto, 0, sizeof(hdlc->proto));
101
102		hdlc->proto.open = ppp_open;
103		hdlc->proto.close = ppp_close;
104		hdlc->proto.type_trans = ppp_type_trans;
105		hdlc->proto.id = IF_PROTO_PPP;
106		dev->hard_start_xmit = hdlc->xmit;
107		dev->hard_header = NULL;
108		dev->type = ARPHRD_PPP;
109		dev->addr_len = 0;
110		netif_dormant_off(dev);
111		return 0;
112	}
113
114	return -EINVAL;
115}
116