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/*
* File: l3phonet.c
*
* L2 PHONET channel to AF_PHONET binding.
*
* Copyright (C) 2011 Renesas Mobile Corporation. All rights reserved.
*
* Author: Petri To Mattila <petri.to.mattila@renesasmobile.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/socket.h>
#include <linux/mhi.h>
#include <linux/l2mux.h>
/* Functions */
static int
mhi_pn_netif_rx(struct sk_buff *skb, struct net_device *dev)
{
/* Set Protocol Family */
skb->protocol = htons(ETH_P_PHONET);
/* Remove L2MUX header and Phonet media byte */
skb_pull(skb, L2MUX_HDR_SIZE + 1);
/* Pass upwards to the Procotol Family */
return netif_rx(skb);
}
static int
mhi_pn_netif_tx(struct sk_buff *skb, struct net_device *dev)
{
struct l2muxhdr *l2hdr;
int l3len;
u8 *ptr;
/* Add media byte */
ptr = skb_push(skb, 1);
/* Set media byte */
ptr[0] = dev->dev_addr[0];
/* L3 length */
l3len = skb->len;
/* Add L2MUX header */
skb_push(skb, L2MUX_HDR_SIZE);
/* Mac header starts here */
skb_reset_mac_header(skb);
/* L2MUX header pointer */
l2hdr = l2mux_hdr(skb);
/* L3 Proto ID */
l2mux_set_proto(l2hdr, MHI_L3_PHONET);
/* L3 payload length */
l2mux_set_length(l2hdr, l3len);
return 0;
}
/* Module registration */
int __init mhi_pn_init(void)
{
int err;
err = l2mux_netif_rx_register(MHI_L3_PHONET, mhi_pn_netif_rx);
if (err)
goto err1;
err = l2mux_netif_tx_register(ETH_P_PHONET, mhi_pn_netif_tx);
if (err)
goto err2;
return 0;
err2:
l2mux_netif_rx_unregister(MHI_L3_PHONET);
err1:
return err;
}
void __exit mhi_pn_exit(void)
{
l2mux_netif_rx_unregister(MHI_L3_PHONET);
l2mux_netif_tx_unregister(ETH_P_PHONET);
}
module_init(mhi_pn_init);
module_exit(mhi_pn_exit);
MODULE_AUTHOR("Petri Mattila <petri.to.mattila@renesasmobile.com>");
MODULE_DESCRIPTION("MHI Phonet protocol family bridge");
MODULE_LICENSE("GPL");
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