1 /* $Id: isdn_net.h,v 1.1.4.1 2001/11/20 14:19:34 kai Exp $
2 *
3 * header for Linux ISDN subsystem, network related functions (linklevel).
4 *
5 * Copyright 1994-1999 by Fritz Elfert (fritz@isdn4linux.de)
6 * Copyright 1995,96 by Thinking Objects Software GmbH Wuerzburg
7 * Copyright 1995,96 by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
8 *
9 * This software may be used and distributed according to the terms
10 * of the GNU General Public License, incorporated herein by reference.
11 *
12 */
13
14 /* Definitions for hupflags: */
15 #define ISDN_WAITCHARGE 1 /* did not get a charge info yet */
16 #define ISDN_HAVECHARGE 2 /* We know a charge info */
17 #define ISDN_CHARGEHUP 4 /* We want to use the charge mechanism */
18 #define ISDN_INHUP 8 /* Even if incoming, close after huptimeout */
19 #define ISDN_MANCHARGE 16 /* Charge Interval manually set */
20
21 /*
22 * Definitions for Cisco-HDLC header.
23 */
24
25 #define CISCO_ADDR_UNICAST 0x0f
26 #define CISCO_ADDR_BROADCAST 0x8f
27 #define CISCO_CTRL 0x00
28 #define CISCO_TYPE_CDP 0x2000
29 #define CISCO_TYPE_SLARP 0x8035
30 #define CISCO_SLARP_REQUEST 0
31 #define CISCO_SLARP_REPLY 1
32 #define CISCO_SLARP_KEEPALIVE 2
33
34 extern char *isdn_net_new(char *, struct net_device *);
35 extern char *isdn_net_newslave(char *);
36 extern int isdn_net_rm(char *);
37 extern int isdn_net_rmall(void);
38 extern int isdn_net_stat_callback(int, isdn_ctrl *);
39 extern int isdn_net_setcfg(isdn_net_ioctl_cfg *);
40 extern int isdn_net_getcfg(isdn_net_ioctl_cfg *);
41 extern int isdn_net_addphone(isdn_net_ioctl_phone *);
42 extern int isdn_net_getphones(isdn_net_ioctl_phone *, char *);
43 extern int isdn_net_getpeer(isdn_net_ioctl_phone *, isdn_net_ioctl_phone *);
44 extern int isdn_net_delphone(isdn_net_ioctl_phone *);
45 extern int isdn_net_find_icall(int, int, int, setup_parm *);
46 extern void isdn_net_hangup(struct net_device *);
47 extern void isdn_net_dial(void);
48 extern void isdn_net_autohup(void);
49 extern int isdn_net_force_hangup(char *);
50 extern int isdn_net_force_dial(char *);
51 extern isdn_net_dev *isdn_net_findif(char *);
52 extern int isdn_net_rcv_skb(int, struct sk_buff *);
53 extern int isdn_net_dial_req(isdn_net_local *);
54 extern void isdn_net_writebuf_skb(isdn_net_local *lp, struct sk_buff *skb);
55 extern void isdn_net_write_super(isdn_net_local *lp, struct sk_buff *skb);
56
57 #define ISDN_NET_MAX_QUEUE_LENGTH 2
58
59 /*
60 * is this particular channel busy?
61 */
isdn_net_lp_busy(isdn_net_local * lp)62 static __inline__ int isdn_net_lp_busy(isdn_net_local *lp)
63 {
64 if (atomic_read(&lp->frame_cnt) < ISDN_NET_MAX_QUEUE_LENGTH)
65 return 0;
66 else
67 return 1;
68 }
69
70 /*
71 * For the given net device, this will get a non-busy channel out of the
72 * corresponding bundle. The returned channel is locked.
73 */
isdn_net_get_locked_lp(isdn_net_dev * nd)74 static __inline__ isdn_net_local * isdn_net_get_locked_lp(isdn_net_dev *nd)
75 {
76 unsigned long flags;
77 isdn_net_local *lp;
78
79 spin_lock_irqsave(&nd->queue_lock, flags);
80 lp = nd->queue; /* get lp on top of queue */
81 spin_lock_bh(&nd->queue->xmit_lock);
82 while (isdn_net_lp_busy(nd->queue)) {
83 spin_unlock_bh(&nd->queue->xmit_lock);
84 nd->queue = nd->queue->next;
85 if (nd->queue == lp) { /* not found -- should never happen */
86 lp = NULL;
87 goto errout;
88 }
89 spin_lock_bh(&nd->queue->xmit_lock);
90 }
91 lp = nd->queue;
92 nd->queue = nd->queue->next;
93 errout:
94 spin_unlock_irqrestore(&nd->queue_lock, flags);
95 return lp;
96 }
97
98 /*
99 * add a channel to a bundle
100 */
isdn_net_add_to_bundle(isdn_net_dev * nd,isdn_net_local * nlp)101 static __inline__ void isdn_net_add_to_bundle(isdn_net_dev *nd, isdn_net_local *nlp)
102 {
103 isdn_net_local *lp;
104 unsigned long flags;
105
106 spin_lock_irqsave(&nd->queue_lock, flags);
107
108 lp = nd->queue;
109 // printk(KERN_DEBUG __FUNCTION__": lp:%s(%p) nlp:%s(%p) last(%p)\n",
110 // lp->name, lp, nlp->name, nlp, lp->last);
111 nlp->last = lp->last;
112 lp->last->next = nlp;
113 lp->last = nlp;
114 nlp->next = lp;
115 nd->queue = nlp;
116
117 spin_unlock_irqrestore(&nd->queue_lock, flags);
118 }
119 /*
120 * remove a channel from the bundle it belongs to
121 */
isdn_net_rm_from_bundle(isdn_net_local * lp)122 static __inline__ void isdn_net_rm_from_bundle(isdn_net_local *lp)
123 {
124 isdn_net_local *master_lp = lp;
125 unsigned long flags;
126
127 if (lp->master)
128 master_lp = (isdn_net_local *) lp->master->priv;
129
130 // printk(KERN_DEBUG __FUNCTION__": lp:%s(%p) mlp:%s(%p) last(%p) next(%p) mndq(%p)\n",
131 // lp->name, lp, master_lp->name, master_lp, lp->last, lp->next, master_lp->netdev->queue);
132 spin_lock_irqsave(&master_lp->netdev->queue_lock, flags);
133 lp->last->next = lp->next;
134 lp->next->last = lp->last;
135 if (master_lp->netdev->queue == lp) {
136 master_lp->netdev->queue = lp->next;
137 if (lp->next == lp) { /* last in queue */
138 master_lp->netdev->queue = master_lp->netdev->local;
139 }
140 }
141 lp->next = lp->last = lp; /* (re)set own pointers */
142 // printk(KERN_DEBUG __FUNCTION__": mndq(%p)\n",
143 // master_lp->netdev->queue);
144 spin_unlock_irqrestore(&master_lp->netdev->queue_lock, flags);
145 }
146
147 static inline int
put_u8(unsigned char * p,u8 x)148 put_u8(unsigned char *p, u8 x)
149 {
150 *p = x;
151 return 1;
152 }
153
154 static inline int
put_u16(unsigned char * p,u16 x)155 put_u16(unsigned char *p, u16 x)
156 {
157 *((u16 *)p) = htons(x);
158 return 2;
159 }
160
161 static inline int
put_u32(unsigned char * p,u32 x)162 put_u32(unsigned char *p, u32 x)
163 {
164 *((u32 *)p) = htonl(x);
165 return 4;
166 }
167
168 static inline int
get_u8(unsigned char * p,u8 * x)169 get_u8(unsigned char *p, u8 *x)
170 {
171 *x = *p;
172 return 1;
173 }
174
175 static inline int
get_u16(unsigned char * p,u16 * x)176 get_u16(unsigned char *p, u16 *x)
177 {
178 *x = ntohs(*((u16 *)p));
179 return 2;
180 }
181
182 static inline int
get_u32(unsigned char * p,u32 * x)183 get_u32(unsigned char *p, u32 *x)
184 {
185 *x = ntohl(*((u32 *)p));
186 return 4;
187 }
188
189
190