377 lines
11 KiB
C
377 lines
11 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) 2005-2008, 2011-2013, 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_MEDIA MAX_BEARERS
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#define ETH_ADDR_OFFSET 4 /* message header offset of MAC address */
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/**
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* struct eth_media - 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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* @setup: work item used when enabling bearer
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* @cleanup: work item used when disabling bearer
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*/
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struct eth_media {
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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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struct work_struct setup;
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struct work_struct cleanup;
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};
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static struct tipc_media eth_media_info;
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static struct eth_media eth_media_array[MAX_ETH_MEDIA];
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static int eth_started;
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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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* Network device notifier info
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*/
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static struct notifier_block notifier = {
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.notifier_call = recv_notification,
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.priority = 0
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};
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/**
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* eth_media_addr_set - initialize Ethernet media address structure
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*
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* Media-dependent "value" field stores MAC address in first 6 bytes
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* and zeroes out the remaining bytes.
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*/
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static void eth_media_addr_set(const struct tipc_bearer *tb_ptr,
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struct tipc_media_addr *a, char *mac)
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{
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memcpy(a->value, mac, ETH_ALEN);
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memset(a->value + ETH_ALEN, 0, sizeof(a->value) - ETH_ALEN);
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a->media_id = TIPC_MEDIA_TYPE_ETH;
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a->broadcast = !memcmp(mac, tb_ptr->bcast_addr.value, ETH_ALEN);
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}
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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_media *)(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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clone->protocol = htons(ETH_P_TIPC);
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dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
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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_media *eb_ptr = (struct eth_media *)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 NET_RX_DROP;
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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 NET_RX_SUCCESS;
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}
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}
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kfree_skb(buf);
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return NET_RX_DROP;
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}
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/**
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* setup_media - setup association between Ethernet bearer and interface
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*/
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static void setup_media(struct work_struct *work)
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{
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struct eth_media *eb_ptr =
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container_of(work, struct eth_media, setup);
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dev_add_pack(&eb_ptr->tipc_packet_type);
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}
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/**
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* enable_media - attach TIPC bearer to an Ethernet interface
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*/
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static int enable_media(struct tipc_bearer *tb_ptr)
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{
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struct net_device *dev;
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struct eth_media *eb_ptr = ð_media_array[0];
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struct eth_media *stop = ð_media_array[MAX_ETH_MEDIA];
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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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dev = dev_get_by_name(&init_net, driver_name);
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if (!dev)
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return -ENODEV;
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/* Create Ethernet bearer for device */
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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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INIT_WORK(&eb_ptr->setup, setup_media);
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schedule_work(&eb_ptr->setup);
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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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memset(tb_ptr->bcast_addr.value, 0, sizeof(tb_ptr->bcast_addr.value));
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memcpy(tb_ptr->bcast_addr.value, dev->broadcast, ETH_ALEN);
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tb_ptr->bcast_addr.media_id = TIPC_MEDIA_TYPE_ETH;
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tb_ptr->bcast_addr.broadcast = 1;
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tb_ptr->mtu = dev->mtu;
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tb_ptr->blocked = 0;
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eth_media_addr_set(tb_ptr, &tb_ptr->addr, (char *)dev->dev_addr);
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return 0;
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}
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/**
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* cleanup_media - break association between Ethernet bearer and interface
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*
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* This routine must be invoked from a work queue because it can sleep.
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*/
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static void cleanup_media(struct work_struct *work)
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{
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struct eth_media *eb_ptr =
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container_of(work, struct eth_media, cleanup);
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dev_remove_pack(&eb_ptr->tipc_packet_type);
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dev_put(eb_ptr->dev);
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eb_ptr->dev = NULL;
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}
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/**
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* disable_media - detach TIPC bearer from an Ethernet interface
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*
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* Mark Ethernet bearer as inactive so that incoming buffers are thrown away,
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* then get worker thread to complete bearer cleanup. (Can't do cleanup
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* here because cleanup code needs to sleep and caller holds spinlocks.)
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*/
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static void disable_media(struct tipc_bearer *tb_ptr)
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{
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struct eth_media *eb_ptr = (struct eth_media *)tb_ptr->usr_handle;
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eb_ptr->bearer = NULL;
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INIT_WORK(&eb_ptr->cleanup, cleanup_media);
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schedule_work(&eb_ptr->cleanup);
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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 *ptr)
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{
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struct net_device *dev = netdev_notifier_info_to_dev(ptr);
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struct eth_media *eb_ptr = ð_media_array[0];
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struct eth_media *stop = ð_media_array[MAX_ETH_MEDIA];
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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);
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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);
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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);
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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 int eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
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{
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if (str_size < 18) /* 18 = strlen("aa:bb:cc:dd:ee:ff\0") */
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return 1;
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sprintf(str_buf, "%pM", a->value);
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return 0;
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}
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/**
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* eth_str2addr - convert Ethernet address format to message header format
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*/
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static int eth_addr2msg(struct tipc_media_addr *a, char *msg_area)
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{
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memset(msg_area, 0, TIPC_MEDIA_ADDR_SIZE);
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msg_area[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_ETH;
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memcpy(msg_area + ETH_ADDR_OFFSET, a->value, ETH_ALEN);
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return 0;
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}
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/**
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* eth_str2addr - convert message header address format to Ethernet format
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*/
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static int eth_msg2addr(const struct tipc_bearer *tb_ptr,
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struct tipc_media_addr *a, char *msg_area)
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{
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if (msg_area[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_ETH)
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return 1;
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eth_media_addr_set(tb_ptr, a, msg_area + ETH_ADDR_OFFSET);
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return 0;
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}
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/*
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* Ethernet media registration info
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*/
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static struct tipc_media eth_media_info = {
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.send_msg = send_msg,
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.enable_media = enable_media,
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.disable_media = disable_media,
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.addr2str = eth_addr2str,
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.addr2msg = eth_addr2msg,
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.msg2addr = eth_msg2addr,
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.priority = TIPC_DEF_LINK_PRI,
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.tolerance = TIPC_DEF_LINK_TOL,
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.window = TIPC_DEF_LINK_WIN,
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.type_id = TIPC_MEDIA_TYPE_ETH,
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.name = "eth"
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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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int res;
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if (eth_started)
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return -EINVAL;
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res = tipc_register_media(ð_media_info);
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if (res)
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return res;
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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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if (!eth_started)
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return;
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flush_scheduled_work();
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unregister_netdevice_notifier(¬ifier);
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eth_started = 0;
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}
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