/*
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/*
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* NET3: Support for 802.2 demultiplexing off Ethernet (Token ring
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* NET3: Support for 802.2 demultiplexing off Ethernet (Token ring
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* is kept separate see p8022tr.c)
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* is kept separate see p8022tr.c)
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* This program is free software; you can redistribute it and/or
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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* 2 of the License, or (at your option) any later version.
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*
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*
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* Demultiplex 802.2 encoded protocols. We match the entry by the
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* Demultiplex 802.2 encoded protocols. We match the entry by the
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* SSAP/DSAP pair and then deliver to the registered datalink that
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* SSAP/DSAP pair and then deliver to the registered datalink that
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* matches. The control byte is ignored and handling of such items
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* matches. The control byte is ignored and handling of such items
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* is up to the routine passed the frame.
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* is up to the routine passed the frame.
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*
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*
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* Unlike the 802.3 datalink we have a list of 802.2 entries as there
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* Unlike the 802.3 datalink we have a list of 802.2 entries as there
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* are multiple protocols to demux. The list is currently short (3 or
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* are multiple protocols to demux. The list is currently short (3 or
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* 4 entries at most). The current demux assumes this.
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* 4 entries at most). The current demux assumes this.
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*/
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*/
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#include <linux/module.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/skbuff.h>
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#include <net/datalink.h>
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#include <net/datalink.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/in.h>
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#include <linux/in.h>
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#include <linux/init.h>
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#include <linux/init.h>
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#include <net/p8022.h>
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#include <net/p8022.h>
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static struct datalink_proto *p8022_list = NULL;
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static struct datalink_proto *p8022_list = NULL;
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/*
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/*
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* We don't handle the loopback SAP stuff, the extended
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* We don't handle the loopback SAP stuff, the extended
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* 802.2 command set, multicast SAP identifiers and non UI
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* 802.2 command set, multicast SAP identifiers and non UI
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* frames. We have the absolute minimum needed for IPX,
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* frames. We have the absolute minimum needed for IPX,
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* IP and Appletalk phase 2. See the llc_* routines for
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* IP and Appletalk phase 2. See the llc_* routines for
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* support libraries if your protocol needs these.
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* support libraries if your protocol needs these.
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*/
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*/
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static struct datalink_proto *find_8022_client(unsigned char type)
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static struct datalink_proto *find_8022_client(unsigned char type)
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{
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{
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struct datalink_proto *proto;
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struct datalink_proto *proto;
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for (proto = p8022_list;
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for (proto = p8022_list;
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((proto != NULL) && (*(proto->type) != type));
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((proto != NULL) && (*(proto->type) != type));
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proto = proto->next)
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proto = proto->next)
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;
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;
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return proto;
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return proto;
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}
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}
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int p8022_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
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int p8022_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
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{
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{
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struct datalink_proto *proto;
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struct datalink_proto *proto;
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proto = find_8022_client(*(skb->h.raw));
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proto = find_8022_client(*(skb->h.raw));
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if (proto != NULL)
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if (proto != NULL)
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{
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{
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skb->h.raw += 3;
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skb->h.raw += 3;
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skb->nh.raw += 3;
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skb->nh.raw += 3;
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skb_pull(skb,3);
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skb_pull(skb,3);
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return proto->rcvfunc(skb, dev, pt);
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return proto->rcvfunc(skb, dev, pt);
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}
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}
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skb->sk = NULL;
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skb->sk = NULL;
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kfree_skb(skb);
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kfree_skb(skb);
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return 0;
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return 0;
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}
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}
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static void p8022_datalink_header(struct datalink_proto *dl,
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static void p8022_datalink_header(struct datalink_proto *dl,
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struct sk_buff *skb, unsigned char *dest_node)
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struct sk_buff *skb, unsigned char *dest_node)
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{
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{
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struct net_device *dev = skb->dev;
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struct net_device *dev = skb->dev;
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unsigned char *rawp;
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unsigned char *rawp;
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rawp = skb_push(skb,3);
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rawp = skb_push(skb,3);
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*rawp++ = dl->type[0];
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*rawp++ = dl->type[0];
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*rawp++ = dl->type[0];
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*rawp++ = dl->type[0];
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*rawp = 0x03; /* UI */
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*rawp = 0x03; /* UI */
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dev->hard_header(skb, dev, ETH_P_802_3, dest_node, NULL, skb->len);
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dev->hard_header(skb, dev, ETH_P_802_3, dest_node, NULL, skb->len);
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}
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}
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static struct packet_type p8022_packet_type =
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static struct packet_type p8022_packet_type =
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{
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{
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0, /* MUTTER ntohs(ETH_P_8022),*/
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0, /* MUTTER ntohs(ETH_P_8022),*/
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NULL, /* All devices */
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NULL, /* All devices */
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p8022_rcv,
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p8022_rcv,
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NULL,
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NULL,
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NULL,
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NULL,
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};
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};
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EXPORT_SYMBOL(register_8022_client);
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EXPORT_SYMBOL(register_8022_client);
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EXPORT_SYMBOL(unregister_8022_client);
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EXPORT_SYMBOL(unregister_8022_client);
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static int __init p8022_init(void)
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static int __init p8022_init(void)
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{
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{
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p8022_packet_type.type=htons(ETH_P_802_2);
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p8022_packet_type.type=htons(ETH_P_802_2);
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dev_add_pack(&p8022_packet_type);
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dev_add_pack(&p8022_packet_type);
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return 0;
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return 0;
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}
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}
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module_init(p8022_init);
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module_init(p8022_init);
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struct datalink_proto *register_8022_client(unsigned char type, int (*rcvfunc)(struct sk_buff *, struct net_device *, struct packet_type *))
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struct datalink_proto *register_8022_client(unsigned char type, int (*rcvfunc)(struct sk_buff *, struct net_device *, struct packet_type *))
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{
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{
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struct datalink_proto *proto;
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struct datalink_proto *proto;
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if (find_8022_client(type) != NULL)
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if (find_8022_client(type) != NULL)
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return NULL;
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return NULL;
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proto = (struct datalink_proto *) kmalloc(sizeof(*proto), GFP_ATOMIC);
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proto = (struct datalink_proto *) kmalloc(sizeof(*proto), GFP_ATOMIC);
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if (proto != NULL) {
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if (proto != NULL) {
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proto->type[0] = type;
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proto->type[0] = type;
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proto->type_len = 1;
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proto->type_len = 1;
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proto->rcvfunc = rcvfunc;
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proto->rcvfunc = rcvfunc;
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proto->header_length = 3;
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proto->header_length = 3;
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proto->datalink_header = p8022_datalink_header;
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proto->datalink_header = p8022_datalink_header;
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proto->string_name = "802.2";
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proto->string_name = "802.2";
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proto->next = p8022_list;
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proto->next = p8022_list;
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p8022_list = proto;
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p8022_list = proto;
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}
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}
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return proto;
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return proto;
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}
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}
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void unregister_8022_client(unsigned char type)
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void unregister_8022_client(unsigned char type)
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{
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{
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struct datalink_proto *tmp, **clients = &p8022_list;
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struct datalink_proto *tmp, **clients = &p8022_list;
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unsigned long flags;
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unsigned long flags;
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save_flags(flags);
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save_flags(flags);
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cli();
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cli();
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while ((tmp = *clients) != NULL)
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while ((tmp = *clients) != NULL)
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{
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{
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if (tmp->type[0] == type) {
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if (tmp->type[0] == type) {
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*clients = tmp->next;
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*clients = tmp->next;
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kfree(tmp);
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kfree(tmp);
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break;
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break;
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} else {
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} else {
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clients = &tmp->next;
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clients = &tmp->next;
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}
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}
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}
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}
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restore_flags(flags);
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restore_flags(flags);
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}
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}
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