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
|
/*
* NET3: Handling for token ring frames that are not IP. IP is hooked
* early in the token ring support code.
*
* 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/config.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/datalink.h>
#include <linux/mm.h>
#include <linux/in.h>
#include <linux/init.h>
#include <net/p8022tr.h>
#define SNAP_HEADER_LEN 8
static struct datalink_proto *p8022tr_list = NULL;
/*
* We don't handle the loopback SAP stuff, the extended
* 802.2 command set, multicast SAP identifiers and non UI
* frames. We have the absolute minimum needed for IPX,
* IP and Appletalk phase 2. See the llc_* routines for support
* to handle the fun stuff.
*
* We assume the list will be very short (at the moment its normally
* one or two entries).
*/
static struct datalink_proto *find_8022tr_client(unsigned char type)
{
struct datalink_proto *proto;
for (proto = p8022tr_list;
((proto != NULL) && (*(proto->type) != type));
proto = proto->next)
;
return proto;
}
int p8022tr_rcv(struct sk_buff *skb, struct device *dev, struct packet_type *pt)
{
struct datalink_proto *proto;
proto = find_8022tr_client(*(skb->h.raw));
if (proto != NULL) {
skb->h.raw += 3;
skb_pull(skb,3);
return proto->rcvfunc(skb, dev, pt);
}
skb->sk = NULL;
kfree_skb(skb, FREE_READ);
return 0;
}
static void p8022tr_datalink_header(struct datalink_proto *dl,
struct sk_buff *skb, unsigned char *dest_node)
{
struct device *dev = skb->dev;
unsigned char *rawp;
unsigned char *olddata;
unsigned char *newdata;
rawp = skb_push(skb,3);
*rawp++ = dl->type[0];
*rawp++ = dl->type[0];
*rawp = 0x03; /* UI */
dev->hard_header(skb, dev, ETH_P_802_3, dest_node, NULL, skb->len);
olddata = skb->data;
newdata = skb_pull(skb, SNAP_HEADER_LEN);
memmove(newdata, olddata, dev->hard_header_len - SNAP_HEADER_LEN);
}
static struct packet_type p8022tr_packet_type =
{
0,
NULL, /* All devices */
p8022tr_rcv,
NULL,
NULL,
};
EXPORT_SYMBOL(register_8022tr_client);
EXPORT_SYMBOL(unregister_8022tr_client);
__initfunc(void p8022tr_proto_init(struct net_proto *pro))
{
p8022tr_packet_type.type=htons(ETH_P_TR_802_2);
dev_add_pack(&p8022tr_packet_type);
}
struct datalink_proto *register_8022tr_client(unsigned char type,
int (*rcvfunc)(struct sk_buff *, struct device *, struct packet_type *))
{
struct datalink_proto *proto;
if (find_8022tr_client(type) != NULL)
return NULL;
proto = (struct datalink_proto *) kmalloc(sizeof(*proto), GFP_ATOMIC);
if (proto != NULL) {
proto->type[0] = type;
proto->type_len = 1;
proto->rcvfunc = rcvfunc;
proto->header_length = 3;
proto->datalink_header = p8022tr_datalink_header;
proto->string_name = "802.2TR";
proto->next = p8022tr_list;
p8022tr_list = proto;
}
return proto;
}
void unregister_8022tr_client(unsigned char type)
{
struct datalink_proto *tmp, **clients = &p8022tr_list;
unsigned long flags;
save_flags(flags);
cli();
while ((tmp = *clients) != NULL)
{
if (tmp->type[0] == type) {
*clients = tmp->next;
kfree_s(tmp, sizeof(struct datalink_proto));
break;
} else {
clients = &tmp->next;
}
}
restore_flags(flags);
}
|
