forked from Minki/linux
886ef52a8c
Eliminates a number of #include statements that no longer serve any useful purpose. Signed-off-by: Allan Stephens <Allan.Stephens@windriver.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
323 lines
8.7 KiB
C
323 lines
8.7 KiB
C
/*
|
|
* net/tipc/eth_media.c: Ethernet bearer support for TIPC
|
|
*
|
|
* Copyright (c) 2001-2007, Ericsson AB
|
|
* Copyright (c) 2005-2007, 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 "core.h"
|
|
#include "bearer.h"
|
|
|
|
#define MAX_ETH_BEARERS 2
|
|
#define ETH_LINK_PRIORITY TIPC_DEF_LINK_PRI
|
|
#define ETH_LINK_TOLERANCE TIPC_DEF_LINK_TOL
|
|
#define ETH_LINK_WINDOW TIPC_DEF_LINK_WIN
|
|
|
|
/**
|
|
* 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;
|
|
int delta;
|
|
|
|
clone = skb_clone(buf, GFP_ATOMIC);
|
|
if (!clone)
|
|
return 0;
|
|
|
|
dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
|
|
delta = dev->hard_header_len - skb_headroom(buf);
|
|
|
|
if ((delta > 0) &&
|
|
pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
|
|
kfree_skb(clone);
|
|
return 0;
|
|
}
|
|
|
|
skb_reset_network_header(clone);
|
|
clone->dev = dev;
|
|
dev_hard_header(clone, dev, ETH_P_TIPC, &dest->dev_addr.eth_addr,
|
|
dev->dev_addr, clone->len);
|
|
dev_queue_xmit(clone);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* recv_msg - handle incoming TIPC message from an Ethernet interface
|
|
*
|
|
* Accept only packets explicitly sent to this node, or broadcast packets;
|
|
* ignores packets sent using Ethernet multicast, and traffic sent to other
|
|
* nodes (which can happen if interface is running in promiscuous mode).
|
|
*/
|
|
|
|
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;
|
|
|
|
if (!net_eq(dev_net(dev), &init_net)) {
|
|
kfree_skb(buf);
|
|
return 0;
|
|
}
|
|
|
|
if (likely(eb_ptr->bearer)) {
|
|
if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
|
|
buf->next = NULL;
|
|
tipc_recv_msg(buf, eb_ptr->bearer);
|
|
return 0;
|
|
}
|
|
}
|
|
kfree_skb(buf);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* enable_bearer - attach TIPC bearer to an Ethernet interface
|
|
*/
|
|
|
|
static int enable_bearer(struct tipc_bearer *tb_ptr)
|
|
{
|
|
struct net_device *dev = NULL;
|
|
struct net_device *pdev = NULL;
|
|
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;
|
|
int pending_dev = 0;
|
|
|
|
/* Find unused Ethernet bearer structure */
|
|
|
|
while (eb_ptr->dev) {
|
|
if (!eb_ptr->bearer)
|
|
pending_dev++;
|
|
if (++eb_ptr == stop)
|
|
return pending_dev ? -EAGAIN : -EDQUOT;
|
|
}
|
|
|
|
/* Find device with specified name */
|
|
|
|
for_each_netdev(&init_net, pdev){
|
|
if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
|
|
dev = pdev;
|
|
break;
|
|
}
|
|
}
|
|
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 = htons(ETH_P_TIPC);
|
|
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 = NULL;
|
|
}
|
|
|
|
/**
|
|
* 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];
|
|
|
|
if (!net_eq(dev_net(dev), &init_net))
|
|
return NOTIFY_DONE;
|
|
|
|
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, "%pM", addr);
|
|
return str_buf;
|
|
}
|
|
|
|
/**
|
|
* tipc_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 tipc_eth_media_start(void)
|
|
{
|
|
struct tipc_media_addr bcast_addr;
|
|
int res;
|
|
|
|
if (eth_started)
|
|
return -EINVAL;
|
|
|
|
bcast_addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
|
|
memset(&bcast_addr.dev_addr, 0xff, ETH_ALEN);
|
|
|
|
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, ETH_LINK_WINDOW);
|
|
if (res)
|
|
return res;
|
|
|
|
notifier.notifier_call = &recv_notification;
|
|
notifier.priority = 0;
|
|
res = register_netdevice_notifier(¬ifier);
|
|
if (!res)
|
|
eth_started = 1;
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tipc_eth_media_stop - deactivate Ethernet bearer support
|
|
*/
|
|
|
|
void tipc_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 = NULL;
|
|
}
|
|
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;
|
|
}
|