hdlc_ppp.c (0612ec48762bf8712db1925b2e67246d2237ebab) hdlc_ppp.c (eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfb)
1/*
2 * Generic HDLC support routines for Linux
3 * Point-to-point protocol support
4 *
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>
5 * Copyright (C) 1999 - 2006 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>
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#include <net/syncppp.h>
25
26
27struct ppp_state {
28 struct ppp_device pppdev;
29 struct ppp_device *syncppp_ptr;
30 int (*old_change_mtu)(struct net_device *dev, int new_mtu);
31};
26
32
33static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr);
34
35
36static inline struct ppp_state* state(hdlc_device *hdlc)
37{
38 return(struct ppp_state *)(hdlc->state);
39}
40
41
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
42static int ppp_open(struct net_device *dev)
43{
44 hdlc_device *hdlc = dev_to_hdlc(dev);
45 void *old_ioctl;
46 int result;
47
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;
48 dev->priv = &state(hdlc)->syncppp_ptr;
49 state(hdlc)->syncppp_ptr = &state(hdlc)->pppdev;
50 state(hdlc)->pppdev.dev = dev;
36
37 old_ioctl = dev->do_ioctl;
51
52 old_ioctl = dev->do_ioctl;
38 hdlc->state.ppp.old_change_mtu = dev->change_mtu;
39 sppp_attach(&hdlc->state.ppp.pppdev);
53 state(hdlc)->old_change_mtu = dev->change_mtu;
54 sppp_attach(&state(hdlc)->pppdev);
40 /* sppp_attach nukes them. We don't need syncppp's ioctl */
41 dev->do_ioctl = old_ioctl;
55 /* sppp_attach nukes them. We don't need syncppp's ioctl */
56 dev->do_ioctl = old_ioctl;
42 hdlc->state.ppp.pppdev.sppp.pp_flags &= ~PP_CISCO;
57 state(hdlc)->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;
58 dev->type = ARPHRD_PPP;
59 result = sppp_open(dev);
60 if (result) {
61 sppp_detach(dev);
62 return result;
63 }
64
65 return 0;
66}
67
68
69
70static void ppp_close(struct net_device *dev)
71{
72 hdlc_device *hdlc = dev_to_hdlc(dev);
73
74 sppp_close(dev);
75 sppp_detach(dev);
76 dev->rebuild_header = NULL;
62 dev->change_mtu = hdlc->state.ppp.old_change_mtu;
77 dev->change_mtu = state(hdlc)->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
78 dev->mtu = HDLC_MAX_MTU;
79 dev->hard_header_len = 16;
80}
81
82
83
84static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev)
85{
86 return __constant_htons(ETH_P_WAN_PPP);
87}
88
89
90
76int hdlc_ppp_ioctl(struct net_device *dev, struct ifreq *ifr)
91static struct hdlc_proto proto = {
92 .open = ppp_open,
93 .close = ppp_close,
94 .type_trans = ppp_type_trans,
95 .ioctl = ppp_ioctl,
96 .module = THIS_MODULE,
97};
98
99
100static int 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:
101{
102 hdlc_device *hdlc = dev_to_hdlc(dev);
103 int result;
104
105 switch (ifr->ifr_settings.type) {
106 case IF_GET_PROTO:
107 if (dev_to_hdlc(dev)->proto != &proto)
108 return -EINVAL;
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
109 ifr->ifr_settings.type = IF_PROTO_PPP;
110 return 0; /* return protocol only, no settable parameters */
111
112 case IF_PROTO_PPP:
113 if(!capable(CAP_NET_ADMIN))
114 return -EPERM;
115
116 if(dev->flags & IFF_UP)
117 return -EBUSY;
118
119 /* no settable parameters */
120
121 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
122 if (result)
123 return result;
124
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;
125 result = attach_hdlc_protocol(dev, &proto, NULL,
126 sizeof(struct ppp_state));
127 if (result)
128 return result;
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}
129 dev->hard_start_xmit = hdlc->xmit;
130 dev->hard_header = NULL;
131 dev->type = ARPHRD_PPP;
132 dev->addr_len = 0;
133 netif_dormant_off(dev);
134 return 0;
135 }
136
137 return -EINVAL;
138}
139
140
141static int __init mod_init(void)
142{
143 register_hdlc_protocol(&proto);
144 return 0;
145}
146
147
148
149static void __exit mod_exit(void)
150{
151 unregister_hdlc_protocol(&proto);
152}
153
154
155module_init(mod_init);
156module_exit(mod_exit);
157
158MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
159MODULE_DESCRIPTION("PPP protocol support for generic HDLC");
160MODULE_LICENSE("GPL v2");