--- /dev/null
+/*
+ * 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>
+
+#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;
+
+ 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, ETH_P_TIPC,
+ &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(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];
+
+ 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;
+}
+
+/**
+ * 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;
+
+ 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, 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;
+}
git://git.onelab.eu / linux-2.6.git / blobdiff