1 files changed, 296 insertions, 0 deletions

diff --git a/net/tipc/eth_media.c b/net/tipc/eth_media.c
new file mode 100644
index 000000000000..b634d7a5640e
--- /dev/null
+++ b/net/tipc/eth_media.c
@@ -0,0 +1,296 @@
+/*
+ * net/tipc/eth_media.c: Ethernet bearer support for TIPC
+ * 
+ * Copyright (c) 2003-2005, Ericsson Research Canada
+ * Copyright (c) 2005, Wind River Systems
+ * Copyright (c) 2005-2006, Ericsson AB
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this 
+ * list of conditions and the following disclaimer.
+ * 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.
+ * 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.
+ *
+ * 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 <linux/version.h>
+
+#define MAX_ETH_BEARERS         2
+#define TIPC_PROTOCOL           0x88ca
+#define ETH_LINK_PRIORITY       10
+#define ETH_LINK_TOLERANCE      TIPC_DEF_LINK_TOL
+
+
+/**
+ * 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, TIPC_PROTOCOL, 
+                                 &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 = &eth_bearers[0];
+        struct eth_bearer *stop = &eth_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(TIPC_PROTOCOL);
+                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 = 0;
+}
+
+/**
+ * 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 = &eth_bearers[0];
+        struct eth_bearer *stop = &eth_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;
+}
+
+/**
+ * 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 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, TIPC_DEF_LINK_WIN);
+        if (res)
+                return res;
+
+        notifier.notifier_call = &recv_notification;
+        notifier.priority = 0;
+        res = register_netdevice_notifier(&notifier);
+        if (!res)
+                eth_started = 1;
+        return res;
+}
+
+/**
+ * eth_media_stop - deactivate Ethernet bearer support
+ */
+
+void eth_media_stop(void)
+{
+        int i;
+
+        if (!eth_started)
+                return;
+
+        unregister_netdevice_notifier(&notifier);
+        for (i = 0; i < MAX_ETH_BEARERS ; i++) {
+                if (eth_bearers[i].bearer) {
+                        eth_bearers[i].bearer->blocked = 1;
+                        eth_bearers[i].bearer = 0;
+                }
+                if (eth_bearers[i].dev) {
+                        dev_remove_pack(&eth_bearers[i].tipc_packet_type);
+                        dev_put(eth_bearers[i].dev);
+                }
+        }
+        memset(&eth_bearers, 0, sizeof(eth_bearers));
+        eth_started = 0;
+}