cmd64x: don't clear the other channel's interrupt
[linux-2.6/linux-mips/linux-dm7025.git] / drivers / net / wan / hdlc_ppp.c
blob3caeb528eacea2f247820a6e2f65e181c54f9e2e
1 /*
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/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>
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);
33 static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr);
36 static inline struct ppp_state* state(hdlc_device *hdlc)
38 return(struct ppp_state *)(hdlc->state);
42 static int ppp_open(struct net_device *dev)
44 hdlc_device *hdlc = dev_to_hdlc(dev);
45 void *old_ioctl;
46 int result;
48 dev->priv = &state(hdlc)->syncppp_ptr;
49 state(hdlc)->syncppp_ptr = &state(hdlc)->pppdev;
50 state(hdlc)->pppdev.dev = dev;
52 old_ioctl = dev->do_ioctl;
53 state(hdlc)->old_change_mtu = dev->change_mtu;
54 sppp_attach(&state(hdlc)->pppdev);
55 /* sppp_attach nukes them. We don't need syncppp's ioctl */
56 dev->do_ioctl = old_ioctl;
57 state(hdlc)->pppdev.sppp.pp_flags &= ~PP_CISCO;
58 dev->type = ARPHRD_PPP;
59 result = sppp_open(dev);
60 if (result) {
61 sppp_detach(dev);
62 return result;
65 return 0;
70 static void ppp_close(struct net_device *dev)
72 hdlc_device *hdlc = dev_to_hdlc(dev);
74 sppp_close(dev);
75 sppp_detach(dev);
77 dev->change_mtu = state(hdlc)->old_change_mtu;
78 dev->mtu = HDLC_MAX_MTU;
79 dev->hard_header_len = 16;
84 static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev)
86 return __constant_htons(ETH_P_WAN_PPP);
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,
100 static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr)
102 hdlc_device *hdlc = dev_to_hdlc(dev);
103 int result;
105 switch (ifr->ifr_settings.type) {
106 case IF_GET_PROTO:
107 if (dev_to_hdlc(dev)->proto != &proto)
108 return -EINVAL;
109 ifr->ifr_settings.type = IF_PROTO_PPP;
110 return 0; /* return protocol only, no settable parameters */
112 case IF_PROTO_PPP:
113 if(!capable(CAP_NET_ADMIN))
114 return -EPERM;
116 if(dev->flags & IFF_UP)
117 return -EBUSY;
119 /* no settable parameters */
121 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
122 if (result)
123 return result;
125 result = attach_hdlc_protocol(dev, &proto, NULL,
126 sizeof(struct ppp_state));
127 if (result)
128 return result;
129 dev->hard_start_xmit = hdlc->xmit;
130 dev->type = ARPHRD_PPP;
131 netif_dormant_off(dev);
132 return 0;
135 return -EINVAL;
139 static int __init mod_init(void)
141 register_hdlc_protocol(&proto);
142 return 0;
147 static void __exit mod_exit(void)
149 unregister_hdlc_protocol(&proto);
153 module_init(mod_init);
154 module_exit(mod_exit);
156 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
157 MODULE_DESCRIPTION("PPP protocol support for generic HDLC");
158 MODULE_LICENSE("GPL v2");