| /* |
| * 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 <net/tipc/tipc.h> |
| #include <net/tipc/tipc_bearer.h> |
| #include <net/tipc/tipc_msg.h> |
| #include <linux/netdevice.h> |
| #include <net/net_namespace.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; |
| struct work_struct setup; |
| }; |
| |
| 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) { |
| skb_reset_network_header(clone); |
| dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev; |
| 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). |
| * 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 (!net_eq(dev_net(dev), &init_net)) { |
| kfree_skb(buf); |
| return 0; |
| } |
| |
| if (likely(eb_ptr->bearer)) { |
| if (likely(buf->pkt_type <= PACKET_BROADCAST)) { |
| 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); |
| return 0; |
| } |
| } |
| } |
| kfree_skb(buf); |
| return 0; |
| } |
| |
| /** |
| * setup_bearer - setup association between Ethernet bearer and interface |
| */ |
| static void setup_bearer(struct work_struct *work) |
| { |
| struct eth_bearer *eb_ptr = |
| container_of(work, struct eth_bearer, setup); |
| |
| dev_add_pack(&eb_ptr->tipc_packet_type); |
| } |
| |
| /** |
| * 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; |
| |
| /* 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); |
| INIT_WORK(&eb_ptr->setup, setup_bearer); |
| schedule_work(&eb_ptr->setup); |
| } |
| |
| /* 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; |
| } |