Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Generic HDLC support routines for Linux | |
3 | * Point-to-point protocol support | |
4 | * | |
eb2a2fd9 | 5 | * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl> |
1da177e4 LT |
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> | |
eb2a2fd9 KH |
25 | #include <net/syncppp.h> |
26 | ||
27 | struct 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 | }; | |
32 | ||
33 | static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr); | |
34 | ||
35 | ||
36 | static inline struct ppp_state* state(hdlc_device *hdlc) | |
37 | { | |
38 | return(struct ppp_state *)(hdlc->state); | |
39 | } | |
1da177e4 LT |
40 | |
41 | ||
42 | static int ppp_open(struct net_device *dev) | |
43 | { | |
44 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
90458401 | 45 | int (*old_ioctl)(struct net_device *, struct ifreq *, int); |
1da177e4 LT |
46 | int result; |
47 | ||
eb2a2fd9 KH |
48 | dev->priv = &state(hdlc)->syncppp_ptr; |
49 | state(hdlc)->syncppp_ptr = &state(hdlc)->pppdev; | |
50 | state(hdlc)->pppdev.dev = dev; | |
1da177e4 LT |
51 | |
52 | old_ioctl = dev->do_ioctl; | |
eb2a2fd9 KH |
53 | state(hdlc)->old_change_mtu = dev->change_mtu; |
54 | sppp_attach(&state(hdlc)->pppdev); | |
1da177e4 LT |
55 | /* sppp_attach nukes them. We don't need syncppp's ioctl */ |
56 | dev->do_ioctl = old_ioctl; | |
eb2a2fd9 | 57 | state(hdlc)->pppdev.sppp.pp_flags &= ~PP_CISCO; |
1da177e4 LT |
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 | ||
70 | static 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); | |
3b04ddde | 76 | |
eb2a2fd9 | 77 | dev->change_mtu = state(hdlc)->old_change_mtu; |
1da177e4 LT |
78 | dev->mtu = HDLC_MAX_MTU; |
79 | dev->hard_header_len = 16; | |
80 | } | |
81 | ||
82 | ||
83 | ||
ab611487 | 84 | static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
85 | { |
86 | return __constant_htons(ETH_P_WAN_PPP); | |
87 | } | |
88 | ||
89 | ||
90 | ||
eb2a2fd9 KH |
91 | static 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 | ||
100 | static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr) | |
1da177e4 LT |
101 | { |
102 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
103 | int result; | |
104 | ||
105 | switch (ifr->ifr_settings.type) { | |
106 | case IF_GET_PROTO: | |
eb2a2fd9 KH |
107 | if (dev_to_hdlc(dev)->proto != &proto) |
108 | return -EINVAL; | |
1da177e4 LT |
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 | ||
40d25142 | 125 | result = attach_hdlc_protocol(dev, &proto, |
eb2a2fd9 KH |
126 | sizeof(struct ppp_state)); |
127 | if (result) | |
128 | return result; | |
1da177e4 | 129 | dev->hard_start_xmit = hdlc->xmit; |
1da177e4 | 130 | dev->type = ARPHRD_PPP; |
4bc83b4d | 131 | netif_dormant_off(dev); |
1da177e4 LT |
132 | return 0; |
133 | } | |
134 | ||
135 | return -EINVAL; | |
136 | } | |
eb2a2fd9 KH |
137 | |
138 | ||
139 | static int __init mod_init(void) | |
140 | { | |
141 | register_hdlc_protocol(&proto); | |
142 | return 0; | |
143 | } | |
144 | ||
145 | ||
146 | ||
147 | static void __exit mod_exit(void) | |
148 | { | |
149 | unregister_hdlc_protocol(&proto); | |
150 | } | |
151 | ||
152 | ||
153 | module_init(mod_init); | |
154 | module_exit(mod_exit); | |
155 | ||
156 | MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); | |
157 | MODULE_DESCRIPTION("PPP protocol support for generic HDLC"); | |
158 | MODULE_LICENSE("GPL v2"); |