zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/net/tipc/eth_media.c b/ap/os/linux/linux-3.4.x/net/tipc/eth_media.c
new file mode 100644
index 0000000..dd625af
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/tipc/eth_media.c
@@ -0,0 +1,411 @@
+/*
+ * net/tipc/eth_media.c: Ethernet bearer support for TIPC
+ *
+ * Copyright (c) 2001-2007, Ericsson AB
+ * Copyright (c) 2005-2008, 2011, 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 "core.h"
+#include "bearer.h"
+
+#define MAX_ETH_BEARERS MAX_BEARERS
+
+#define ETH_ADDR_OFFSET 4 /* message header offset of MAC address */
+
+/**
+ * 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
+ * @cleanup: work item used when disabling bearer
+ */
+
+struct eth_bearer {
+ struct tipc_bearer *bearer;
+ struct net_device *dev;
+ struct packet_type tipc_packet_type;
+ struct work_struct setup;
+ struct work_struct cleanup;
+};
+
+static struct tipc_media eth_media_info;
+static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
+static int eth_started;
+static struct notifier_block notifier;
+
+/**
+ * eth_media_addr_set - initialize Ethernet media address structure
+ *
+ * Media-dependent "value" field stores MAC address in first 6 bytes
+ * and zeroes out the remaining bytes.
+ */
+
+static void eth_media_addr_set(struct tipc_media_addr *a, char *mac)
+{
+ memcpy(a->value, mac, ETH_ALEN);
+ memset(a->value + ETH_ALEN, 0, sizeof(a->value) - ETH_ALEN);
+ a->media_id = TIPC_MEDIA_TYPE_ETH;
+ a->broadcast = !memcmp(mac, eth_media_info.bcast_addr.value, ETH_ALEN);
+}
+
+/**
+ * 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;
+ int delta;
+
+ clone = skb_clone(buf, GFP_ATOMIC);
+ if (!clone)
+ return 0;
+
+ dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
+ delta = dev->hard_header_len - skb_headroom(buf);
+
+ if ((delta > 0) &&
+ pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
+ kfree_skb(clone);
+ return 0;
+ }
+
+ skb_reset_network_header(clone);
+ clone->dev = dev;
+ dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
+ 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).
+ */
+
+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;
+
+ 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)) {
+ 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;
+ int pending_dev = 0;
+
+ /* Find unused Ethernet bearer structure */
+
+ while (eb_ptr->dev) {
+ if (!eb_ptr->bearer)
+ pending_dev++;
+ if (++eb_ptr == stop)
+ return pending_dev ? -EAGAIN : -EDQUOT;
+ }
+
+ /* Find device with specified name */
+
+ read_lock(&dev_base_lock);
+ for_each_netdev(&init_net, pdev) {
+ if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
+ dev = pdev;
+ dev_hold(dev);
+ break;
+ }
+ }
+ read_unlock(&dev_base_lock);
+ if (!dev)
+ return -ENODEV;
+
+ /* Create Ethernet bearer for device */
+
+ 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));
+ 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;
+ eth_media_addr_set(&tb_ptr->addr, (char *)dev->dev_addr);
+ return 0;
+}
+
+/**
+ * cleanup_bearer - break association between Ethernet bearer and interface
+ *
+ * This routine must be invoked from a work queue because it can sleep.
+ */
+
+static void cleanup_bearer(struct work_struct *work)
+{
+ struct eth_bearer *eb_ptr =
+ container_of(work, struct eth_bearer, cleanup);
+
+ dev_remove_pack(&eb_ptr->tipc_packet_type);
+ dev_put(eb_ptr->dev);
+ eb_ptr->dev = NULL;
+}
+
+/**
+ * disable_bearer - detach TIPC bearer from an Ethernet interface
+ *
+ * Mark Ethernet bearer as inactive so that incoming buffers are thrown away,
+ * then get worker thread to complete bearer cleanup. (Can't do cleanup
+ * here because cleanup code needs to sleep and caller holds spinlocks.)
+ */
+
+static void disable_bearer(struct tipc_bearer *tb_ptr)
+{
+ struct eth_bearer *eb_ptr = (struct eth_bearer *)tb_ptr->usr_handle;
+
+ eb_ptr->bearer = NULL;
+ INIT_WORK(&eb_ptr->cleanup, cleanup_bearer);
+ schedule_work(&eb_ptr->cleanup);
+}
+
+/**
+ * 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 int eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
+{
+ if (str_size < 18) /* 18 = strlen("aa:bb:cc:dd:ee:ff\0") */
+ return 1;
+
+ sprintf(str_buf, "%pM", a->value);
+ return 0;
+}
+
+/**
+ * eth_str2addr - convert string to Ethernet address
+ */
+
+static int eth_str2addr(struct tipc_media_addr *a, char *str_buf)
+{
+ char mac[ETH_ALEN];
+ int r;
+
+ r = sscanf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x",
+ (u32 *)&mac[0], (u32 *)&mac[1], (u32 *)&mac[2],
+ (u32 *)&mac[3], (u32 *)&mac[4], (u32 *)&mac[5]);
+
+ if (r != ETH_ALEN)
+ return 1;
+
+ eth_media_addr_set(a, mac);
+ return 0;
+}
+
+/**
+ * eth_str2addr - convert Ethernet address format to message header format
+ */
+
+static int eth_addr2msg(struct tipc_media_addr *a, char *msg_area)
+{
+ memset(msg_area, 0, TIPC_MEDIA_ADDR_SIZE);
+ msg_area[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_ETH;
+ memcpy(msg_area + ETH_ADDR_OFFSET, a->value, ETH_ALEN);
+ return 0;
+}
+
+/**
+ * eth_str2addr - convert message header address format to Ethernet format
+ */
+
+static int eth_msg2addr(struct tipc_media_addr *a, char *msg_area)
+{
+ if (msg_area[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_ETH)
+ return 1;
+
+ eth_media_addr_set(a, msg_area + ETH_ADDR_OFFSET);
+ return 0;
+}
+
+/*
+ * Ethernet media registration info
+ */
+
+static struct tipc_media eth_media_info = {
+ .send_msg = send_msg,
+ .enable_bearer = enable_bearer,
+ .disable_bearer = disable_bearer,
+ .addr2str = eth_addr2str,
+ .str2addr = eth_str2addr,
+ .addr2msg = eth_addr2msg,
+ .msg2addr = eth_msg2addr,
+ .bcast_addr = { { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
+ TIPC_MEDIA_TYPE_ETH, 1 },
+ .priority = TIPC_DEF_LINK_PRI,
+ .tolerance = TIPC_DEF_LINK_TOL,
+ .window = TIPC_DEF_LINK_WIN,
+ .type_id = TIPC_MEDIA_TYPE_ETH,
+ .name = "eth"
+};
+
+/**
+ * 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)
+{
+ int res;
+
+ if (eth_started)
+ return -EINVAL;
+
+ res = tipc_register_media(ð_media_info);
+ 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)
+{
+ if (!eth_started)
+ return;
+
+ flush_scheduled_work();
+ unregister_netdevice_notifier(¬ifier);
+ eth_started = 0;
+}