593a5f22d8
Updated copyright notice to include the year the file was actually created. Information about file creation dates was extracted from the files in the old CVS repository at tipc.sourceforge.net. Signed-off-by: Per Liden <per.liden@nospam.ericsson.com>
299 lines
8.3 KiB
C
299 lines
8.3 KiB
C
/*
|
|
* net/tipc/eth_media.c: Ethernet bearer support for TIPC
|
|
*
|
|
* Copyright (c) 2001-2006, Ericsson AB
|
|
* Copyright (c) 2005, Wind River Systems
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the names of the copyright holders nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <net/tipc/tipc.h>
|
|
#include <net/tipc/tipc_bearer.h>
|
|
#include <net/tipc/tipc_msg.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/version.h>
|
|
|
|
#define MAX_ETH_BEARERS 2
|
|
#define TIPC_PROTOCOL 0x88ca
|
|
#define ETH_LINK_PRIORITY 10
|
|
#define ETH_LINK_TOLERANCE TIPC_DEF_LINK_TOL
|
|
|
|
|
|
/**
|
|
* struct eth_bearer - Ethernet bearer data structure
|
|
* @bearer: ptr to associated "generic" bearer structure
|
|
* @dev: ptr to associated Ethernet network device
|
|
* @tipc_packet_type: used in binding TIPC to Ethernet driver
|
|
*/
|
|
|
|
struct eth_bearer {
|
|
struct tipc_bearer *bearer;
|
|
struct net_device *dev;
|
|
struct packet_type tipc_packet_type;
|
|
};
|
|
|
|
static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
|
|
static int eth_started = 0;
|
|
static struct notifier_block notifier;
|
|
|
|
/**
|
|
* send_msg - send a TIPC message out over an Ethernet interface
|
|
*/
|
|
|
|
static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
|
|
struct tipc_media_addr *dest)
|
|
{
|
|
struct sk_buff *clone;
|
|
struct net_device *dev;
|
|
|
|
clone = skb_clone(buf, GFP_ATOMIC);
|
|
if (clone) {
|
|
clone->nh.raw = clone->data;
|
|
dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
|
|
clone->dev = dev;
|
|
dev->hard_header(clone, dev, TIPC_PROTOCOL,
|
|
&dest->dev_addr.eth_addr,
|
|
dev->dev_addr, clone->len);
|
|
dev_queue_xmit(clone);
|
|
}
|
|
return TIPC_OK;
|
|
}
|
|
|
|
/**
|
|
* recv_msg - handle incoming TIPC message from an Ethernet interface
|
|
*
|
|
* Routine truncates any Ethernet padding/CRC appended to the message,
|
|
* and ensures message size matches actual length
|
|
*/
|
|
|
|
static int recv_msg(struct sk_buff *buf, struct net_device *dev,
|
|
struct packet_type *pt, struct net_device *orig_dev)
|
|
{
|
|
struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv;
|
|
u32 size;
|
|
|
|
if (likely(eb_ptr->bearer)) {
|
|
size = msg_size((struct tipc_msg *)buf->data);
|
|
skb_trim(buf, size);
|
|
if (likely(buf->len == size)) {
|
|
buf->next = NULL;
|
|
tipc_recv_msg(buf, eb_ptr->bearer);
|
|
} else {
|
|
kfree_skb(buf);
|
|
}
|
|
} else {
|
|
kfree_skb(buf);
|
|
}
|
|
return TIPC_OK;
|
|
}
|
|
|
|
/**
|
|
* enable_bearer - attach TIPC bearer to an Ethernet interface
|
|
*/
|
|
|
|
static int enable_bearer(struct tipc_bearer *tb_ptr)
|
|
{
|
|
struct net_device *dev = dev_base;
|
|
struct eth_bearer *eb_ptr = ð_bearers[0];
|
|
struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS];
|
|
char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1;
|
|
|
|
/* Find device with specified name */
|
|
|
|
while (dev && dev->name &&
|
|
(memcmp(dev->name, driver_name, strlen(dev->name)))) {
|
|
dev = dev->next;
|
|
}
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
/* Find Ethernet bearer for device (or create one) */
|
|
|
|
for (;(eb_ptr != stop) && eb_ptr->dev && (eb_ptr->dev != dev); eb_ptr++);
|
|
if (eb_ptr == stop)
|
|
return -EDQUOT;
|
|
if (!eb_ptr->dev) {
|
|
eb_ptr->dev = dev;
|
|
eb_ptr->tipc_packet_type.type = __constant_htons(TIPC_PROTOCOL);
|
|
eb_ptr->tipc_packet_type.dev = dev;
|
|
eb_ptr->tipc_packet_type.func = recv_msg;
|
|
eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
|
|
INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
|
|
dev_hold(dev);
|
|
dev_add_pack(&eb_ptr->tipc_packet_type);
|
|
}
|
|
|
|
/* Associate TIPC bearer with Ethernet bearer */
|
|
|
|
eb_ptr->bearer = tb_ptr;
|
|
tb_ptr->usr_handle = (void *)eb_ptr;
|
|
tb_ptr->mtu = dev->mtu;
|
|
tb_ptr->blocked = 0;
|
|
tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
|
|
memcpy(&tb_ptr->addr.dev_addr, &dev->dev_addr, ETH_ALEN);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* disable_bearer - detach TIPC bearer from an Ethernet interface
|
|
*
|
|
* We really should do dev_remove_pack() here, but this function can not be
|
|
* called at tasklet level. => Use eth_bearer->bearer as a flag to throw away
|
|
* incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit.
|
|
*/
|
|
|
|
static void disable_bearer(struct tipc_bearer *tb_ptr)
|
|
{
|
|
((struct eth_bearer *)tb_ptr->usr_handle)->bearer = 0;
|
|
}
|
|
|
|
/**
|
|
* recv_notification - handle device updates from OS
|
|
*
|
|
* Change the state of the Ethernet bearer (if any) associated with the
|
|
* specified device.
|
|
*/
|
|
|
|
static int recv_notification(struct notifier_block *nb, unsigned long evt,
|
|
void *dv)
|
|
{
|
|
struct net_device *dev = (struct net_device *)dv;
|
|
struct eth_bearer *eb_ptr = ð_bearers[0];
|
|
struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS];
|
|
|
|
while ((eb_ptr->dev != dev)) {
|
|
if (++eb_ptr == stop)
|
|
return NOTIFY_DONE; /* couldn't find device */
|
|
}
|
|
if (!eb_ptr->bearer)
|
|
return NOTIFY_DONE; /* bearer had been disabled */
|
|
|
|
eb_ptr->bearer->mtu = dev->mtu;
|
|
|
|
switch (evt) {
|
|
case NETDEV_CHANGE:
|
|
if (netif_carrier_ok(dev))
|
|
tipc_continue(eb_ptr->bearer);
|
|
else
|
|
tipc_block_bearer(eb_ptr->bearer->name);
|
|
break;
|
|
case NETDEV_UP:
|
|
tipc_continue(eb_ptr->bearer);
|
|
break;
|
|
case NETDEV_DOWN:
|
|
tipc_block_bearer(eb_ptr->bearer->name);
|
|
break;
|
|
case NETDEV_CHANGEMTU:
|
|
case NETDEV_CHANGEADDR:
|
|
tipc_block_bearer(eb_ptr->bearer->name);
|
|
tipc_continue(eb_ptr->bearer);
|
|
break;
|
|
case NETDEV_UNREGISTER:
|
|
case NETDEV_CHANGENAME:
|
|
tipc_disable_bearer(eb_ptr->bearer->name);
|
|
break;
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
/**
|
|
* eth_addr2str - convert Ethernet address to string
|
|
*/
|
|
|
|
static char *eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
|
|
{
|
|
unchar *addr = (unchar *)&a->dev_addr;
|
|
|
|
if (str_size < 18)
|
|
*str_buf = '\0';
|
|
else
|
|
sprintf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x",
|
|
addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
|
|
return str_buf;
|
|
}
|
|
|
|
/**
|
|
* eth_media_start - activate Ethernet bearer support
|
|
*
|
|
* Register Ethernet media type with TIPC bearer code. Also register
|
|
* with OS for notifications about device state changes.
|
|
*/
|
|
|
|
int eth_media_start(void)
|
|
{
|
|
struct tipc_media_addr bcast_addr;
|
|
int res;
|
|
|
|
if (eth_started)
|
|
return -EINVAL;
|
|
|
|
memset(&bcast_addr, 0xff, sizeof(bcast_addr));
|
|
memset(eth_bearers, 0, sizeof(eth_bearers));
|
|
|
|
res = tipc_register_media(TIPC_MEDIA_TYPE_ETH, "eth",
|
|
enable_bearer, disable_bearer, send_msg,
|
|
eth_addr2str, &bcast_addr, ETH_LINK_PRIORITY,
|
|
ETH_LINK_TOLERANCE, TIPC_DEF_LINK_WIN);
|
|
if (res)
|
|
return res;
|
|
|
|
notifier.notifier_call = &recv_notification;
|
|
notifier.priority = 0;
|
|
res = register_netdevice_notifier(¬ifier);
|
|
if (!res)
|
|
eth_started = 1;
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* eth_media_stop - deactivate Ethernet bearer support
|
|
*/
|
|
|
|
void eth_media_stop(void)
|
|
{
|
|
int i;
|
|
|
|
if (!eth_started)
|
|
return;
|
|
|
|
unregister_netdevice_notifier(¬ifier);
|
|
for (i = 0; i < MAX_ETH_BEARERS ; i++) {
|
|
if (eth_bearers[i].bearer) {
|
|
eth_bearers[i].bearer->blocked = 1;
|
|
eth_bearers[i].bearer = 0;
|
|
}
|
|
if (eth_bearers[i].dev) {
|
|
dev_remove_pack(ð_bearers[i].tipc_packet_type);
|
|
dev_put(eth_bearers[i].dev);
|
|
}
|
|
}
|
|
memset(ð_bearers, 0, sizeof(eth_bearers));
|
|
eth_started = 0;
|
|
}
|