1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
|
/*
* Copyright 1996 The Australian National University.
* Copyright 1996 Fujitsu Laboratories Limited
*
* This software may be distributed under the terms of the Gnu
* Public License version 2 or later
*/
/*
* $Id: bif.c,v 1.13 1996/12/18 01:45:52 tridge Exp $
*
* Network interface definitions for bif device.
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/in.h>
#include <linux/if_ether.h> /* For the statistics structure. */
#include <linux/netdevice.h>
#include <linux/if_arp.h> /* For ARPHRD_BIF */
#include <asm/system.h>
#include <asm/segment.h>
#include <asm/io.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <asm/ap1000/apservice.h>
#include <asm/ap1000/apreg.h>
#define BIF_DEBUG 0
#if BIF_DEBUG
static int seq = 0;
#endif
#define BIF_MTU 10240
static struct device *bif_device = 0;
static struct net_device_stats *bif_stats = 0;
int bif_init(struct device *dev);
int bif_open(struct device *dev);
static int bif_xmit(struct sk_buff *skb, struct device *dev);
int bif_rx(struct sk_buff *skb);
int bif_stop(struct device *dev);
static struct net_device_stats *bif_get_stats(struct device *dev);
static int bif_hard_header(struct sk_buff *skb, struct device *dev,
unsigned short type, void *daddr,
void *saddr, unsigned len)
{
#if BIF_DEBUG
printk("bif_hard_header()\n");
#endif
skb_push(skb,dev->hard_header_len);
if (daddr) skb->arp = 1;
/* tell IP how much space we took */
return (dev->hard_header_len);
}
static int bif_rebuild_header(void *buff, struct device *dev,
unsigned long raddr, struct sk_buff *skb)
{
/* this would normally be used to fill in hardware addresses after
an ARP */
#if BIF_DEBUG
printk("bif_rebuild_header()\n");
#endif
if (skb) skb->arp = 1;
return(0);
}
static int bif_set_mac_address(struct device *dev, void *addr)
{
printk("BIF: set_mac_address called\n");
return (0);
}
static void bif_set_multicast_list(struct device *dev)
{
return;
}
static int bif_do_ioctl(struct device *dev, struct ifreq *ifr, int cmd)
{
printk("BIF: Called do_ioctl\n");
return (0);
}
static int bif_set_config(struct device *dev, struct ifmap *map)
{
printk("BIF: Called bif_set_config\n");
return (0);
}
/*
* Initialise bif network interface.
*/
int bif_init(struct device *dev)
{
int i;
printk("bif_init(): Initialising bif interface\n");
bif_device = dev;
dev->mtu = BIF_MTU;
dev->tbusy = 0;
dev->hard_start_xmit = bif_xmit;
dev->hard_header = bif_hard_header;
dev->hard_header_len = sizeof(struct cap_request);
dev->addr_len = 0;
dev->tx_queue_len = 50000; /* no limit (almost!) */
dev->type = ARPHRD_BIF;
dev->rebuild_header = bif_rebuild_header;
dev->open = bif_open;
dev->flags = IFF_NOARP; /* Don't use ARP on this device */
dev->priv = kmalloc(sizeof(struct net_device_stats), GFP_KERNEL);
if (dev->priv == NULL)
return -ENOMEM;
memset(dev->priv, 0, sizeof(struct net_device_stats));
bif_stats = (struct net_device_stats *)bif_device->priv;
dev->stop = bif_stop;
dev->get_stats = bif_get_stats;
dev->set_mac_address = bif_set_mac_address;
dev->header_cache_update = NULL;
dev->do_ioctl = bif_do_ioctl;
dev->set_config = bif_set_config;
dev->set_multicast_list = bif_set_multicast_list;
memset(dev->broadcast, 0xFF, ETH_ALEN);
dev_init_buffers(dev);
return(0);
}
int bif_open(struct device *dev)
{
printk("In bif_open\n");
dev->tbusy = 0;
dev->start = 1;
return 0;
}
#if BIF_DEBUG
static void dump_packet(char *action, char *buf, int len, int seq)
{
int flags;
char *sep;
printk("%s packet %d of %d bytes at %d:\n", action, seq,
len, (int)jiffies);
printk(" from %x to %x pktid=%d ttl=%d pcol=%d len=%d\n",
*(long *)(buf+12), *(long *)(buf+16), *(u_short *)(buf+4),
*(unsigned char *)(buf+8), buf[9], *(u_short *)(buf+2));
if( buf[9] == 6 || buf[9] == 17 ){
/* TCP or UDP */
printk(" sport=%d dport=%d",
*(u_short *)(buf+20), *(u_short *)(buf+22));
if( buf[9] == 6 ){
printk(" seq=%d ack=%d win=%d flags=<",
*(long *)(buf+24), *(long *)(buf+28),
*(unsigned short *)(buf+34));
flags = buf[33];
sep = "";
printk(">");
}
printk("\n");
}
else {
printk(" protocol = %d\n", buf[9]);
}
}
#endif
static int bif_xmit(struct sk_buff *skb, struct device *dev)
{
extern int bif_send_ip(int cid,struct sk_buff *skb);
extern int tnet_send_ip(int cid,struct sk_buff *skb);
extern int msc_blocked, tnet_ip_enabled;
u_long destip;
int cid;
if (skb == NULL || dev == NULL)
return(0);
destip = *(u_long *)(skb->data+sizeof(struct cap_request)+16);
cid = ap_ip_to_cid(destip);
skb->dev = dev;
skb->mac.raw = skb->data;
if (cid != -1 && tnet_ip_enabled && !msc_blocked) {
tnet_send_ip(cid,skb);
} else {
bif_send_ip(cid, skb);
}
dev->tbusy = 0;
bif_stats->tx_packets++;
mark_bh(NET_BH);
return 0;
}
/*
* Receive a packet from the BIF - called from interrupt handler.
*/
int bif_rx(struct sk_buff *skb)
{
#if BIF_DEBUG
dump_packet("bif_rx:", skb->data, skb->len, seq++);
#endif
if (bif_device == NULL) {
printk("bif: bif_device is NULL in bif_rx\n");
dev_kfree_skb(skb);
return 0;
}
skb->dev = bif_device;
skb->protocol = ETH_P_IP;
#if 1
/* try disabling checksums on receive */
if (ap_ip_to_cid(*(u_long *)(((char *)skb->data)+12)) != -1)
skb->ip_summed = CHECKSUM_UNNECESSARY;
#endif
/*
* Inform the network layer of the new packet.
*/
skb->mac.raw = skb->data;
netif_rx(skb);
if (bif_stats == NULL) {
printk("bif: bif_stats is NULL is bif_rx\n");
return 0;
}
bif_stats->rx_packets++;
return 0;
}
int bif_stop(struct device *dev)
{
printk("in bif_close\n");
dev->tbusy = 1;
dev->start = 0;
return 0;
}
/*
* Return statistics of bif driver.
*/
static struct net_device_stats *bif_get_stats(struct device *dev)
{
return((struct net_device_stats *)dev->priv);
}
|
