324 lines
8.7 KiB
C
324 lines
8.7 KiB
C
/*
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* net/tipc/eth_media.c: Ethernet bearer support for TIPC
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*
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* Copyright (c) 2001-2007, Ericsson AB
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* Copyright (c) 2005-2007, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "core.h"
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#include "bearer.h"
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#define MAX_ETH_BEARERS 2
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#define ETH_LINK_PRIORITY TIPC_DEF_LINK_PRI
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#define ETH_LINK_TOLERANCE TIPC_DEF_LINK_TOL
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#define ETH_LINK_WINDOW TIPC_DEF_LINK_WIN
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/**
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* struct eth_bearer - Ethernet bearer data structure
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* @bearer: ptr to associated "generic" bearer structure
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* @dev: ptr to associated Ethernet network device
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* @tipc_packet_type: used in binding TIPC to Ethernet driver
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*/
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struct eth_bearer {
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struct tipc_bearer *bearer;
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struct net_device *dev;
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struct packet_type tipc_packet_type;
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};
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static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
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static int eth_started;
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static struct notifier_block notifier;
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/**
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* send_msg - send a TIPC message out over an Ethernet interface
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*/
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static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
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struct tipc_media_addr *dest)
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{
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struct sk_buff *clone;
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struct net_device *dev;
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int delta;
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clone = skb_clone(buf, GFP_ATOMIC);
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if (!clone)
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return 0;
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dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
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delta = dev->hard_header_len - skb_headroom(buf);
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if ((delta > 0) &&
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pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
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kfree_skb(clone);
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return 0;
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}
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skb_reset_network_header(clone);
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clone->dev = dev;
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dev_hard_header(clone, dev, ETH_P_TIPC, &dest->dev_addr.eth_addr,
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dev->dev_addr, clone->len);
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dev_queue_xmit(clone);
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return 0;
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}
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/**
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* recv_msg - handle incoming TIPC message from an Ethernet interface
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*
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* Accept only packets explicitly sent to this node, or broadcast packets;
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* ignores packets sent using Ethernet multicast, and traffic sent to other
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* nodes (which can happen if interface is running in promiscuous mode).
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*/
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static int recv_msg(struct sk_buff *buf, struct net_device *dev,
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struct packet_type *pt, struct net_device *orig_dev)
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{
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struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv;
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if (!net_eq(dev_net(dev), &init_net)) {
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kfree_skb(buf);
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return 0;
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}
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if (likely(eb_ptr->bearer)) {
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if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
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buf->next = NULL;
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tipc_recv_msg(buf, eb_ptr->bearer);
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return 0;
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}
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}
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kfree_skb(buf);
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return 0;
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}
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/**
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* enable_bearer - attach TIPC bearer to an Ethernet interface
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*/
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static int enable_bearer(struct tipc_bearer *tb_ptr)
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{
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struct net_device *dev = NULL;
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struct net_device *pdev = NULL;
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struct eth_bearer *eb_ptr = ð_bearers[0];
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struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS];
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char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1;
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int pending_dev = 0;
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/* Find unused Ethernet bearer structure */
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while (eb_ptr->dev) {
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if (!eb_ptr->bearer)
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pending_dev++;
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if (++eb_ptr == stop)
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return pending_dev ? -EAGAIN : -EDQUOT;
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}
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/* Find device with specified name */
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for_each_netdev(&init_net, pdev) {
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if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
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dev = pdev;
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break;
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}
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}
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if (!dev)
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return -ENODEV;
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/* Find Ethernet bearer for device (or create one) */
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while ((eb_ptr != stop) && eb_ptr->dev && (eb_ptr->dev != dev))
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eb_ptr++;
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if (eb_ptr == stop)
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return -EDQUOT;
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if (!eb_ptr->dev) {
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eb_ptr->dev = dev;
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eb_ptr->tipc_packet_type.type = htons(ETH_P_TIPC);
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eb_ptr->tipc_packet_type.dev = dev;
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eb_ptr->tipc_packet_type.func = recv_msg;
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eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
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INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
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dev_hold(dev);
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dev_add_pack(&eb_ptr->tipc_packet_type);
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}
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/* Associate TIPC bearer with Ethernet bearer */
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eb_ptr->bearer = tb_ptr;
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tb_ptr->usr_handle = (void *)eb_ptr;
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tb_ptr->mtu = dev->mtu;
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tb_ptr->blocked = 0;
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tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
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memcpy(&tb_ptr->addr.dev_addr, dev->dev_addr, ETH_ALEN);
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return 0;
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}
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/**
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* disable_bearer - detach TIPC bearer from an Ethernet interface
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*
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* We really should do dev_remove_pack() here, but this function can not be
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* called at tasklet level. => Use eth_bearer->bearer as a flag to throw away
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* incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit.
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*/
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static void disable_bearer(struct tipc_bearer *tb_ptr)
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{
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((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL;
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}
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/**
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* recv_notification - handle device updates from OS
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*
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* Change the state of the Ethernet bearer (if any) associated with the
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* specified device.
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*/
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static int recv_notification(struct notifier_block *nb, unsigned long evt,
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void *dv)
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{
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struct net_device *dev = (struct net_device *)dv;
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struct eth_bearer *eb_ptr = ð_bearers[0];
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struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS];
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if (!net_eq(dev_net(dev), &init_net))
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return NOTIFY_DONE;
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while ((eb_ptr->dev != dev)) {
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if (++eb_ptr == stop)
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return NOTIFY_DONE; /* couldn't find device */
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}
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if (!eb_ptr->bearer)
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return NOTIFY_DONE; /* bearer had been disabled */
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eb_ptr->bearer->mtu = dev->mtu;
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switch (evt) {
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case NETDEV_CHANGE:
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if (netif_carrier_ok(dev))
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tipc_continue(eb_ptr->bearer);
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else
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tipc_block_bearer(eb_ptr->bearer->name);
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break;
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case NETDEV_UP:
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tipc_continue(eb_ptr->bearer);
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break;
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case NETDEV_DOWN:
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tipc_block_bearer(eb_ptr->bearer->name);
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break;
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case NETDEV_CHANGEMTU:
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case NETDEV_CHANGEADDR:
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tipc_block_bearer(eb_ptr->bearer->name);
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tipc_continue(eb_ptr->bearer);
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break;
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case NETDEV_UNREGISTER:
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case NETDEV_CHANGENAME:
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tipc_disable_bearer(eb_ptr->bearer->name);
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break;
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}
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return NOTIFY_OK;
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}
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/**
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* eth_addr2str - convert Ethernet address to string
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*/
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static char *eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
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{
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unchar *addr = (unchar *)&a->dev_addr;
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if (str_size < 18)
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*str_buf = '\0';
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else
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sprintf(str_buf, "%pM", addr);
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return str_buf;
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}
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/**
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* tipc_eth_media_start - activate Ethernet bearer support
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*
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* Register Ethernet media type with TIPC bearer code. Also register
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* with OS for notifications about device state changes.
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*/
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int tipc_eth_media_start(void)
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{
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struct tipc_media_addr bcast_addr;
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int res;
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if (eth_started)
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return -EINVAL;
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bcast_addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
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memset(&bcast_addr.dev_addr, 0xff, ETH_ALEN);
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memset(eth_bearers, 0, sizeof(eth_bearers));
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res = tipc_register_media(TIPC_MEDIA_TYPE_ETH, "eth",
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enable_bearer, disable_bearer, send_msg,
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eth_addr2str, &bcast_addr, ETH_LINK_PRIORITY,
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ETH_LINK_TOLERANCE, ETH_LINK_WINDOW);
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if (res)
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return res;
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notifier.notifier_call = &recv_notification;
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notifier.priority = 0;
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res = register_netdevice_notifier(¬ifier);
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if (!res)
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eth_started = 1;
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return res;
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}
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/**
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* tipc_eth_media_stop - deactivate Ethernet bearer support
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*/
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void tipc_eth_media_stop(void)
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{
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int i;
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if (!eth_started)
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return;
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unregister_netdevice_notifier(¬ifier);
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for (i = 0; i < MAX_ETH_BEARERS ; i++) {
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if (eth_bearers[i].bearer) {
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eth_bearers[i].bearer->blocked = 1;
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eth_bearers[i].bearer = NULL;
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}
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if (eth_bearers[i].dev) {
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dev_remove_pack(ð_bearers[i].tipc_packet_type);
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dev_put(eth_bearers[i].dev);
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}
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}
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memset(ð_bearers, 0, sizeof(eth_bearers));
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eth_started = 0;
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}
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