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518 lines
12 KiB
518 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved. |
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* |
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* RMNET configuration engine |
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*/ |
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|
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#include <net/sock.h> |
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#include <linux/module.h> |
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#include <linux/netlink.h> |
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#include <linux/netdevice.h> |
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#include "rmnet_config.h" |
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#include "rmnet_handlers.h" |
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#include "rmnet_vnd.h" |
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#include "rmnet_private.h" |
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/* Local Definitions and Declarations */ |
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static const struct nla_policy rmnet_policy[IFLA_RMNET_MAX + 1] = { |
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[IFLA_RMNET_MUX_ID] = { .type = NLA_U16 }, |
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[IFLA_RMNET_FLAGS] = { .len = sizeof(struct ifla_rmnet_flags) }, |
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}; |
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static int rmnet_is_real_dev_registered(const struct net_device *real_dev) |
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{ |
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return rcu_access_pointer(real_dev->rx_handler) == rmnet_rx_handler; |
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} |
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/* Needs rtnl lock */ |
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struct rmnet_port* |
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rmnet_get_port_rtnl(const struct net_device *real_dev) |
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{ |
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return rtnl_dereference(real_dev->rx_handler_data); |
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} |
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static int rmnet_unregister_real_device(struct net_device *real_dev) |
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{ |
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struct rmnet_port *port = rmnet_get_port_rtnl(real_dev); |
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if (port->nr_rmnet_devs) |
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return -EINVAL; |
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netdev_rx_handler_unregister(real_dev); |
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kfree(port); |
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netdev_dbg(real_dev, "Removed from rmnet\n"); |
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return 0; |
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} |
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static int rmnet_register_real_device(struct net_device *real_dev, |
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struct netlink_ext_ack *extack) |
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{ |
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struct rmnet_port *port; |
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int rc, entry; |
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ASSERT_RTNL(); |
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if (rmnet_is_real_dev_registered(real_dev)) { |
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port = rmnet_get_port_rtnl(real_dev); |
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if (port->rmnet_mode != RMNET_EPMODE_VND) { |
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NL_SET_ERR_MSG_MOD(extack, "bridge device already exists"); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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port = kzalloc(sizeof(*port), GFP_KERNEL); |
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if (!port) |
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return -ENOMEM; |
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port->dev = real_dev; |
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rc = netdev_rx_handler_register(real_dev, rmnet_rx_handler, port); |
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if (rc) { |
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kfree(port); |
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return -EBUSY; |
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} |
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for (entry = 0; entry < RMNET_MAX_LOGICAL_EP; entry++) |
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INIT_HLIST_HEAD(&port->muxed_ep[entry]); |
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netdev_dbg(real_dev, "registered with rmnet\n"); |
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return 0; |
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} |
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static void rmnet_unregister_bridge(struct rmnet_port *port) |
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{ |
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struct net_device *bridge_dev, *real_dev, *rmnet_dev; |
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struct rmnet_port *real_port; |
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if (port->rmnet_mode != RMNET_EPMODE_BRIDGE) |
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return; |
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rmnet_dev = port->rmnet_dev; |
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if (!port->nr_rmnet_devs) { |
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/* bridge device */ |
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real_dev = port->bridge_ep; |
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bridge_dev = port->dev; |
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real_port = rmnet_get_port_rtnl(real_dev); |
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real_port->bridge_ep = NULL; |
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real_port->rmnet_mode = RMNET_EPMODE_VND; |
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} else { |
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/* real device */ |
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bridge_dev = port->bridge_ep; |
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port->bridge_ep = NULL; |
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port->rmnet_mode = RMNET_EPMODE_VND; |
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} |
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netdev_upper_dev_unlink(bridge_dev, rmnet_dev); |
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rmnet_unregister_real_device(bridge_dev); |
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} |
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static int rmnet_newlink(struct net *src_net, struct net_device *dev, |
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struct nlattr *tb[], struct nlattr *data[], |
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struct netlink_ext_ack *extack) |
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{ |
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u32 data_format = RMNET_FLAGS_INGRESS_DEAGGREGATION; |
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struct net_device *real_dev; |
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int mode = RMNET_EPMODE_VND; |
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struct rmnet_endpoint *ep; |
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struct rmnet_port *port; |
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int err = 0; |
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u16 mux_id; |
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if (!tb[IFLA_LINK]) { |
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NL_SET_ERR_MSG_MOD(extack, "link not specified"); |
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return -EINVAL; |
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} |
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real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); |
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if (!real_dev) { |
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NL_SET_ERR_MSG_MOD(extack, "link does not exist"); |
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return -ENODEV; |
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} |
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ep = kzalloc(sizeof(*ep), GFP_KERNEL); |
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if (!ep) |
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return -ENOMEM; |
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mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]); |
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err = rmnet_register_real_device(real_dev, extack); |
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if (err) |
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goto err0; |
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port = rmnet_get_port_rtnl(real_dev); |
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err = rmnet_vnd_newlink(mux_id, dev, port, real_dev, ep, extack); |
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if (err) |
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goto err1; |
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err = netdev_upper_dev_link(real_dev, dev, extack); |
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if (err < 0) |
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goto err2; |
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port->rmnet_mode = mode; |
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port->rmnet_dev = dev; |
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hlist_add_head_rcu(&ep->hlnode, &port->muxed_ep[mux_id]); |
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if (data[IFLA_RMNET_FLAGS]) { |
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struct ifla_rmnet_flags *flags; |
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flags = nla_data(data[IFLA_RMNET_FLAGS]); |
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data_format &= ~flags->mask; |
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data_format |= flags->flags & flags->mask; |
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} |
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netdev_dbg(dev, "data format [0x%08X]\n", data_format); |
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port->data_format = data_format; |
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return 0; |
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err2: |
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unregister_netdevice(dev); |
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rmnet_vnd_dellink(mux_id, port, ep); |
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err1: |
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rmnet_unregister_real_device(real_dev); |
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err0: |
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kfree(ep); |
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return err; |
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} |
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static void rmnet_dellink(struct net_device *dev, struct list_head *head) |
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{ |
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struct rmnet_priv *priv = netdev_priv(dev); |
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struct net_device *real_dev, *bridge_dev; |
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struct rmnet_port *real_port, *bridge_port; |
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struct rmnet_endpoint *ep; |
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u8 mux_id = priv->mux_id; |
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real_dev = priv->real_dev; |
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if (!rmnet_is_real_dev_registered(real_dev)) |
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return; |
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real_port = rmnet_get_port_rtnl(real_dev); |
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bridge_dev = real_port->bridge_ep; |
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if (bridge_dev) { |
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bridge_port = rmnet_get_port_rtnl(bridge_dev); |
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rmnet_unregister_bridge(bridge_port); |
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} |
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ep = rmnet_get_endpoint(real_port, mux_id); |
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if (ep) { |
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hlist_del_init_rcu(&ep->hlnode); |
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rmnet_vnd_dellink(mux_id, real_port, ep); |
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kfree(ep); |
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} |
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netdev_upper_dev_unlink(real_dev, dev); |
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rmnet_unregister_real_device(real_dev); |
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unregister_netdevice_queue(dev, head); |
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} |
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static void rmnet_force_unassociate_device(struct net_device *real_dev) |
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{ |
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struct hlist_node *tmp_ep; |
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struct rmnet_endpoint *ep; |
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struct rmnet_port *port; |
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unsigned long bkt_ep; |
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LIST_HEAD(list); |
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port = rmnet_get_port_rtnl(real_dev); |
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if (port->nr_rmnet_devs) { |
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/* real device */ |
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rmnet_unregister_bridge(port); |
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hash_for_each_safe(port->muxed_ep, bkt_ep, tmp_ep, ep, hlnode) { |
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unregister_netdevice_queue(ep->egress_dev, &list); |
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netdev_upper_dev_unlink(real_dev, ep->egress_dev); |
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rmnet_vnd_dellink(ep->mux_id, port, ep); |
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hlist_del_init_rcu(&ep->hlnode); |
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kfree(ep); |
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} |
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rmnet_unregister_real_device(real_dev); |
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unregister_netdevice_many(&list); |
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} else { |
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rmnet_unregister_bridge(port); |
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} |
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} |
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static int rmnet_config_notify_cb(struct notifier_block *nb, |
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unsigned long event, void *data) |
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{ |
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struct net_device *real_dev = netdev_notifier_info_to_dev(data); |
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if (!rmnet_is_real_dev_registered(real_dev)) |
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return NOTIFY_DONE; |
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switch (event) { |
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case NETDEV_UNREGISTER: |
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netdev_dbg(real_dev, "Kernel unregister\n"); |
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rmnet_force_unassociate_device(real_dev); |
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break; |
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case NETDEV_CHANGEMTU: |
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if (rmnet_vnd_validate_real_dev_mtu(real_dev)) |
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return NOTIFY_BAD; |
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break; |
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default: |
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break; |
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} |
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return NOTIFY_DONE; |
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} |
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static struct notifier_block rmnet_dev_notifier __read_mostly = { |
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.notifier_call = rmnet_config_notify_cb, |
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}; |
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static int rmnet_rtnl_validate(struct nlattr *tb[], struct nlattr *data[], |
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struct netlink_ext_ack *extack) |
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{ |
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u16 mux_id; |
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if (!data || !data[IFLA_RMNET_MUX_ID]) { |
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NL_SET_ERR_MSG_MOD(extack, "MUX ID not specified"); |
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return -EINVAL; |
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} |
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mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]); |
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if (mux_id > (RMNET_MAX_LOGICAL_EP - 1)) { |
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NL_SET_ERR_MSG_MOD(extack, "invalid MUX ID"); |
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return -ERANGE; |
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} |
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return 0; |
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} |
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static int rmnet_changelink(struct net_device *dev, struct nlattr *tb[], |
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struct nlattr *data[], |
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struct netlink_ext_ack *extack) |
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{ |
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struct rmnet_priv *priv = netdev_priv(dev); |
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struct net_device *real_dev; |
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struct rmnet_port *port; |
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u16 mux_id; |
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if (!dev) |
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return -ENODEV; |
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real_dev = priv->real_dev; |
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if (!rmnet_is_real_dev_registered(real_dev)) |
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return -ENODEV; |
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port = rmnet_get_port_rtnl(real_dev); |
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if (data[IFLA_RMNET_MUX_ID]) { |
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mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]); |
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if (mux_id != priv->mux_id) { |
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struct rmnet_endpoint *ep; |
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ep = rmnet_get_endpoint(port, priv->mux_id); |
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if (!ep) |
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return -ENODEV; |
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if (rmnet_get_endpoint(port, mux_id)) { |
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NL_SET_ERR_MSG_MOD(extack, |
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"MUX ID already exists"); |
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return -EINVAL; |
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} |
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hlist_del_init_rcu(&ep->hlnode); |
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hlist_add_head_rcu(&ep->hlnode, |
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&port->muxed_ep[mux_id]); |
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ep->mux_id = mux_id; |
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priv->mux_id = mux_id; |
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} |
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} |
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if (data[IFLA_RMNET_FLAGS]) { |
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struct ifla_rmnet_flags *flags; |
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u32 old_data_format; |
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old_data_format = port->data_format; |
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flags = nla_data(data[IFLA_RMNET_FLAGS]); |
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port->data_format &= ~flags->mask; |
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port->data_format |= flags->flags & flags->mask; |
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if (rmnet_vnd_update_dev_mtu(port, real_dev)) { |
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port->data_format = old_data_format; |
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NL_SET_ERR_MSG_MOD(extack, "Invalid MTU on real dev"); |
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return -EINVAL; |
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} |
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} |
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return 0; |
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} |
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static size_t rmnet_get_size(const struct net_device *dev) |
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{ |
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return |
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/* IFLA_RMNET_MUX_ID */ |
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nla_total_size(2) + |
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/* IFLA_RMNET_FLAGS */ |
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nla_total_size(sizeof(struct ifla_rmnet_flags)); |
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} |
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static int rmnet_fill_info(struct sk_buff *skb, const struct net_device *dev) |
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{ |
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struct rmnet_priv *priv = netdev_priv(dev); |
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struct net_device *real_dev; |
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struct ifla_rmnet_flags f; |
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struct rmnet_port *port; |
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real_dev = priv->real_dev; |
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if (nla_put_u16(skb, IFLA_RMNET_MUX_ID, priv->mux_id)) |
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goto nla_put_failure; |
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if (rmnet_is_real_dev_registered(real_dev)) { |
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port = rmnet_get_port_rtnl(real_dev); |
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f.flags = port->data_format; |
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} else { |
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f.flags = 0; |
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} |
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f.mask = ~0; |
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if (nla_put(skb, IFLA_RMNET_FLAGS, sizeof(f), &f)) |
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goto nla_put_failure; |
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return 0; |
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nla_put_failure: |
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return -EMSGSIZE; |
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} |
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struct rtnl_link_ops rmnet_link_ops __read_mostly = { |
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.kind = "rmnet", |
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.maxtype = __IFLA_RMNET_MAX, |
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.priv_size = sizeof(struct rmnet_priv), |
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.setup = rmnet_vnd_setup, |
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.validate = rmnet_rtnl_validate, |
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.newlink = rmnet_newlink, |
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.dellink = rmnet_dellink, |
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.get_size = rmnet_get_size, |
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.changelink = rmnet_changelink, |
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.policy = rmnet_policy, |
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.fill_info = rmnet_fill_info, |
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}; |
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struct rmnet_port *rmnet_get_port_rcu(struct net_device *real_dev) |
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{ |
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if (rmnet_is_real_dev_registered(real_dev)) |
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return rcu_dereference_bh(real_dev->rx_handler_data); |
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else |
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return NULL; |
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} |
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struct rmnet_endpoint *rmnet_get_endpoint(struct rmnet_port *port, u8 mux_id) |
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{ |
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struct rmnet_endpoint *ep; |
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hlist_for_each_entry_rcu(ep, &port->muxed_ep[mux_id], hlnode) { |
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if (ep->mux_id == mux_id) |
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return ep; |
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} |
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return NULL; |
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} |
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int rmnet_add_bridge(struct net_device *rmnet_dev, |
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struct net_device *slave_dev, |
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struct netlink_ext_ack *extack) |
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{ |
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struct rmnet_priv *priv = netdev_priv(rmnet_dev); |
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struct net_device *real_dev = priv->real_dev; |
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struct rmnet_port *port, *slave_port; |
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int err; |
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port = rmnet_get_port_rtnl(real_dev); |
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/* If there is more than one rmnet dev attached, its probably being |
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* used for muxing. Skip the briding in that case |
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*/ |
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if (port->nr_rmnet_devs > 1) { |
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NL_SET_ERR_MSG_MOD(extack, "more than one rmnet dev attached"); |
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return -EINVAL; |
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} |
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if (port->rmnet_mode != RMNET_EPMODE_VND) { |
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NL_SET_ERR_MSG_MOD(extack, "more than one bridge dev attached"); |
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return -EINVAL; |
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} |
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if (rmnet_is_real_dev_registered(slave_dev)) { |
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NL_SET_ERR_MSG_MOD(extack, |
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"slave cannot be another rmnet dev"); |
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return -EBUSY; |
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} |
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err = rmnet_register_real_device(slave_dev, extack); |
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if (err) |
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return -EBUSY; |
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err = netdev_master_upper_dev_link(slave_dev, rmnet_dev, NULL, NULL, |
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extack); |
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if (err) { |
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rmnet_unregister_real_device(slave_dev); |
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return err; |
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} |
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slave_port = rmnet_get_port_rtnl(slave_dev); |
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slave_port->rmnet_mode = RMNET_EPMODE_BRIDGE; |
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slave_port->bridge_ep = real_dev; |
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slave_port->rmnet_dev = rmnet_dev; |
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port->rmnet_mode = RMNET_EPMODE_BRIDGE; |
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port->bridge_ep = slave_dev; |
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netdev_dbg(slave_dev, "registered with rmnet as slave\n"); |
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return 0; |
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} |
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int rmnet_del_bridge(struct net_device *rmnet_dev, |
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struct net_device *slave_dev) |
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{ |
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struct rmnet_port *port = rmnet_get_port_rtnl(slave_dev); |
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rmnet_unregister_bridge(port); |
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netdev_dbg(slave_dev, "removed from rmnet as slave\n"); |
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return 0; |
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} |
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/* Startup/Shutdown */ |
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static int __init rmnet_init(void) |
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{ |
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int rc; |
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rc = register_netdevice_notifier(&rmnet_dev_notifier); |
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if (rc != 0) |
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return rc; |
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rc = rtnl_link_register(&rmnet_link_ops); |
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if (rc != 0) { |
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unregister_netdevice_notifier(&rmnet_dev_notifier); |
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return rc; |
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} |
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return rc; |
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} |
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static void __exit rmnet_exit(void) |
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{ |
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rtnl_link_unregister(&rmnet_link_ops); |
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unregister_netdevice_notifier(&rmnet_dev_notifier); |
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} |
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module_init(rmnet_init) |
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module_exit(rmnet_exit) |
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MODULE_ALIAS_RTNL_LINK("rmnet"); |
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MODULE_LICENSE("GPL v2");
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