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/*
* 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/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);
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);
}
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