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1da177e4 LT |
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 | ||
27 | static 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 | ||
55 | static 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 | ||
ab611487 | 69 | static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
70 | { |
71 | return __constant_htons(ETH_P_WAN_PPP); | |
72 | } | |
73 | ||
74 | ||
75 | ||
76 | int 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; | |
4bc83b4d | 110 | netif_dormant_off(dev); |
1da177e4 LT |
111 | return 0; |
112 | } | |
113 | ||
114 | return -EINVAL; | |
115 | } |