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
|
/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* HIPPI-type device handling.
*
* Version: @(#)hippi.c 1.0.0 05/29/97
*
* Authors: Ross Biro, <bir7@leland.Stanford.Edu>
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
* Mark Evans, <evansmp@uhura.aston.ac.uk>
* Florian La Roche, <rzsfl@rz.uni-sb.de>
* Alan Cox, <gw4pts@gw4pts.ampr.org>
* Jes Sorensen, <Jes.Sorensen@cern.ch>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/hippidevice.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <net/arp.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <asm/checksum.h>
#include <asm/segment.h>
#include <asm/system.h>
/*
* hippi_net_init()
*
* Do nothing, this is just to pursuade the stupid linker to behave.
*/
void hippi_net_init(void)
{
return;
}
/*
* Create the HIPPI MAC header for an arbitrary protocol layer
*
* saddr=NULL means use device source address
* daddr=NULL means leave destination address (eg unresolved arp)
*/
int hippi_header(struct sk_buff *skb, struct net_device *dev,
unsigned short type, void *daddr, void *saddr,
unsigned len)
{
struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN);
if (!len){
len = skb->len - HIPPI_HLEN;
printk("hippi_header(): length not supplied\n");
}
/*
* Due to the stupidity of the little endian byte-order we
* have to set the fp field this way.
*/
hip->fp.fixed = __constant_htonl(0x04800018);
hip->fp.d2_size = htonl(len + 8);
hip->le.fc = 0;
hip->le.double_wide = 0; /* only HIPPI 800 for the time being */
hip->le.message_type = 0; /* Data PDU */
hip->le.dest_addr_type = 2; /* 12 bit SC address */
hip->le.src_addr_type = 2; /* 12 bit SC address */
memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
memset(&hip->le.reserved, 0, 16);
hip->snap.dsap = HIPPI_EXTENDED_SAP;
hip->snap.ssap = HIPPI_EXTENDED_SAP;
hip->snap.ctrl = HIPPI_UI_CMD;
hip->snap.oui[0] = 0x00;
hip->snap.oui[1] = 0x00;
hip->snap.oui[2] = 0x00;
hip->snap.ethertype = htons(type);
if (daddr)
{
memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
memcpy(&skb->private.ifield, daddr + 2, 4);
return HIPPI_HLEN;
}
return -HIPPI_HLEN;
}
/*
* Rebuild the HIPPI MAC header. This is called after an ARP has
* completed on this sk_buff. We now let ARP fill in the other fields.
*/
int hippi_rebuild_header(struct sk_buff *skb)
{
struct hippi_hdr *hip = (struct hippi_hdr *)skb->data;
/*
* Only IP is currently supported
*/
if(hip->snap.ethertype != __constant_htons(ETH_P_IP))
{
printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype));
return 0;
}
/*
* We don't support dynamic ARP on HIPPI, but we use the ARP
* static ARP tables to hold the I-FIELDs.
*/
return arp_find(hip->le.daddr, skb);
}
/*
* Determine the packet's protocol ID.
*/
unsigned short hippi_type_trans(struct sk_buff *skb, struct net_device *dev)
{
struct hippi_hdr *hip;
hip = (struct hippi_hdr *) skb->data;
/*
* This is actually wrong ... question is if we really should
* set the raw address here.
*/
skb->mac.raw = skb->data;
skb_pull(skb, HIPPI_HLEN);
/*
* No fancy promisc stuff here now.
*/
return hip->snap.ethertype;
}
|
