blob: 2a30d55cb121118c782dd01707f9dffb5803eecf [file] [log] [blame]
/* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* RMNET Data configuration engine
*/
#include <net/sock.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/rmnet_data.h>
#include <net/rmnet_config.h>
#include "rmnet_data_config.h"
#include "rmnet_data_handlers.h"
#include "rmnet_data_vnd.h"
#include "rmnet_data_private.h"
#include "rmnet_data_trace.h"
RMNET_LOG_MODULE(RMNET_DATA_LOGMASK_CONFIG);
/* Local Definitions and Declarations */
static struct sock *nl_socket_handle;
#ifndef RMNET_KERNEL_PRE_3_8
static struct netlink_kernel_cfg rmnet_netlink_cfg = {
.input = rmnet_config_netlink_msg_handler
};
#endif
static struct notifier_block rmnet_dev_notifier = {
.notifier_call = rmnet_config_notify_cb,
.next = 0,
.priority = 0
};
struct rmnet_free_vnd_work {
struct work_struct work;
int vnd_id[RMNET_DATA_MAX_VND];
int count;
};
/* Init and Cleanup */
#ifdef RMNET_KERNEL_PRE_3_8
static struct sock *_rmnet_config_start_netlink(void)
{
return netlink_kernel_create(&init_net,
RMNET_NETLINK_PROTO,
0,
rmnet_config_netlink_msg_handler,
NULL,
THIS_MODULE);
}
#else
static struct sock *_rmnet_config_start_netlink(void)
{
return netlink_kernel_create(&init_net,
RMNET_NETLINK_PROTO,
&rmnet_netlink_cfg);
}
#endif /* RMNET_KERNEL_PRE_3_8 */
/* rmnet_config_init() - Startup init
*
* Registers netlink protocol with kernel and opens socket. Netlink handler is
* registered with kernel.
*/
int rmnet_config_init(void)
{
int rc;
nl_socket_handle = _rmnet_config_start_netlink();
if (!nl_socket_handle) {
LOGE("%s", "Failed to init netlink socket");
return RMNET_INIT_ERROR;
}
rc = register_netdevice_notifier(&rmnet_dev_notifier);
if (rc != 0) {
LOGE("Failed to register device notifier; rc=%d", rc);
/* TODO: Cleanup the nl socket */
return RMNET_INIT_ERROR;
}
return 0;
}
/* rmnet_config_exit() - Cleans up all netlink related resources */
void rmnet_config_exit(void)
{
int rc;
netlink_kernel_release(nl_socket_handle);
rc = unregister_netdevice_notifier(&rmnet_dev_notifier);
if (rc != 0)
LOGE("Failed to unregister device notifier; rc=%d", rc);
}
/* Helper Functions */
/* _rmnet_is_physical_endpoint_associated() - Determines if device is associated
* @dev: Device to get check
*
* Compares device rx_handler callback pointer against known function
*
* Return:
* - 1 if associated
* - 0 if NOT associated
*/
static inline int _rmnet_is_physical_endpoint_associated(struct net_device *dev)
{
rx_handler_func_t *rx_handler;
rx_handler = rcu_dereference(dev->rx_handler);
if (rx_handler == rmnet_rx_handler)
return 1;
else
return 0;
}
/* _rmnet_get_phys_ep_config() - Get physical ep config for an associated device
* @dev: Device to get endpoint configuration from
*
* Return:
* - pointer to configuration if successful
* - 0 (null) if device is not associated
*/
struct rmnet_phys_ep_config *_rmnet_get_phys_ep_config
(struct net_device *dev)
{
struct rmnet_phys_ep_conf_s *_rmnet_phys_ep_config;
if (_rmnet_is_physical_endpoint_associated(dev)) {
_rmnet_phys_ep_config = (struct rmnet_phys_ep_conf_s *)
rcu_dereference(dev->rx_handler_data);
if (_rmnet_phys_ep_config && _rmnet_phys_ep_config->config)
return (struct rmnet_phys_ep_config *)
_rmnet_phys_ep_config->config;
else
return 0;
} else {
return 0;
}
}
/* _rmnet_get_logical_ep() - Gets the logical end point configuration
* structure for a network device
* @dev: Device to get endpoint configuration from
* @config_id: Logical endpoint id on device
* Retrieves the logical_endpoint_config structure.
*
* Return:
* - End point configuration structure
* - NULL in case of an error
*/
struct rmnet_logical_ep_conf_s *_rmnet_get_logical_ep(struct net_device *dev,
int config_id)
{
struct rmnet_phys_ep_config *config;
struct rmnet_logical_ep_conf_s *epconfig_l;
if (rmnet_vnd_is_vnd(dev)) {
epconfig_l = rmnet_vnd_get_le_config(dev);
} else {
config = _rmnet_get_phys_ep_config(dev);
if (!config)
return NULL;
if (config_id == RMNET_LOCAL_LOGICAL_ENDPOINT)
epconfig_l = &config->local_ep;
else
epconfig_l = &config->muxed_ep[config_id];
}
return epconfig_l;
}
/* Netlink Handler */
static void _rmnet_netlink_set_link_egress_data_format
(struct rmnet_nl_msg_s *rmnet_header,
struct rmnet_nl_msg_s *resp_rmnet)
{
struct net_device *dev;
if (!rmnet_header || !resp_rmnet)
return;
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
dev = dev_get_by_name(&init_net, rmnet_header->data_format.dev);
if (!dev) {
resp_rmnet->return_code = RMNET_CONFIG_NO_SUCH_DEVICE;
return;
}
resp_rmnet->return_code =
rmnet_set_egress_data_format(dev,
rmnet_header->data_format.flags,
rmnet_header->data_format.agg_size,
rmnet_header->data_format.agg_count
);
dev_put(dev);
}
static void _rmnet_netlink_set_link_ingress_data_format
(struct rmnet_nl_msg_s *rmnet_header,
struct rmnet_nl_msg_s *resp_rmnet)
{
struct net_device *dev;
if (!rmnet_header || !resp_rmnet)
return;
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
dev = dev_get_by_name(&init_net, rmnet_header->data_format.dev);
if (!dev) {
resp_rmnet->return_code = RMNET_CONFIG_NO_SUCH_DEVICE;
return;
}
resp_rmnet->return_code = rmnet_set_ingress_data_format(
dev,
rmnet_header->data_format.flags,
rmnet_header->data_format.tail_spacing);
dev_put(dev);
}
static void _rmnet_netlink_set_logical_ep_config
(struct rmnet_nl_msg_s *rmnet_header,
struct rmnet_nl_msg_s *resp_rmnet)
{
struct net_device *dev, *dev2;
if (!rmnet_header || !resp_rmnet)
return;
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
if (rmnet_header->local_ep_config.ep_id < -1 ||
rmnet_header->local_ep_config.ep_id > 254) {
resp_rmnet->return_code = RMNET_CONFIG_BAD_ARGUMENTS;
return;
}
dev = dev_get_by_name(&init_net,
rmnet_header->local_ep_config.dev);
dev2 = dev_get_by_name(&init_net,
rmnet_header->local_ep_config.next_dev);
if (dev && dev2)
resp_rmnet->return_code =
rmnet_set_logical_endpoint_config(
dev,
rmnet_header->local_ep_config.ep_id,
rmnet_header->local_ep_config.operating_mode,
dev2);
else
resp_rmnet->return_code = RMNET_CONFIG_NO_SUCH_DEVICE;
if (dev)
dev_put(dev);
if (dev2)
dev_put(dev2);
}
static void _rmnet_netlink_unset_logical_ep_config
(struct rmnet_nl_msg_s *rmnet_header,
struct rmnet_nl_msg_s *resp_rmnet)
{
struct net_device *dev;
if (!rmnet_header || !resp_rmnet)
return;
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
if (rmnet_header->local_ep_config.ep_id < -1 ||
rmnet_header->local_ep_config.ep_id > 254) {
resp_rmnet->return_code = RMNET_CONFIG_BAD_ARGUMENTS;
return;
}
dev = dev_get_by_name(&init_net,
rmnet_header->local_ep_config.dev);
if (dev) {
resp_rmnet->return_code =
rmnet_unset_logical_endpoint_config(
dev,
rmnet_header->local_ep_config.ep_id);
dev_put(dev);
} else {
resp_rmnet->return_code = RMNET_CONFIG_NO_SUCH_DEVICE;
}
}
static void _rmnet_netlink_get_logical_ep_config
(struct rmnet_nl_msg_s *rmnet_header,
struct rmnet_nl_msg_s *resp_rmnet)
{
struct net_device *dev;
if (!rmnet_header || !resp_rmnet)
return;
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
if (rmnet_header->local_ep_config.ep_id < -1 ||
rmnet_header->local_ep_config.ep_id > 254) {
resp_rmnet->return_code = RMNET_CONFIG_BAD_ARGUMENTS;
return;
}
dev = dev_get_by_name(&init_net,
rmnet_header->local_ep_config.dev);
if (dev)
resp_rmnet->return_code =
rmnet_get_logical_endpoint_config(
dev,
rmnet_header->local_ep_config.ep_id,
&resp_rmnet->local_ep_config.operating_mode,
resp_rmnet->local_ep_config.next_dev,
sizeof(resp_rmnet->local_ep_config.next_dev));
else {
resp_rmnet->return_code = RMNET_CONFIG_NO_SUCH_DEVICE;
return;
}
if (resp_rmnet->return_code == RMNET_CONFIG_OK) {
/* Begin Data */
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNDATA;
resp_rmnet->arg_length = sizeof(((struct rmnet_nl_msg_s *)0)
->local_ep_config);
}
dev_put(dev);
}
static void _rmnet_netlink_associate_network_device
(struct rmnet_nl_msg_s *rmnet_header,
struct rmnet_nl_msg_s *resp_rmnet)
{
struct net_device *dev;
if (!rmnet_header || !resp_rmnet)
return;
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
dev = dev_get_by_name(&init_net, rmnet_header->data);
if (!dev) {
resp_rmnet->return_code = RMNET_CONFIG_NO_SUCH_DEVICE;
return;
}
resp_rmnet->return_code = rmnet_associate_network_device(dev);
dev_put(dev);
}
static void _rmnet_netlink_unassociate_network_device
(struct rmnet_nl_msg_s *rmnet_header,
struct rmnet_nl_msg_s *resp_rmnet)
{
struct net_device *dev;
if (!rmnet_header || !resp_rmnet)
return;
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
dev = dev_get_by_name(&init_net, rmnet_header->data);
if (!dev) {
resp_rmnet->return_code = RMNET_CONFIG_NO_SUCH_DEVICE;
return;
}
resp_rmnet->return_code = rmnet_unassociate_network_device(dev);
dev_put(dev);
}
static void _rmnet_netlink_get_network_device_associated
(struct rmnet_nl_msg_s *rmnet_header,
struct rmnet_nl_msg_s *resp_rmnet)
{
struct net_device *dev;
if (!rmnet_header || !resp_rmnet)
return;
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
dev = dev_get_by_name(&init_net, rmnet_header->data);
if (!dev) {
resp_rmnet->return_code = RMNET_CONFIG_NO_SUCH_DEVICE;
return;
}
resp_rmnet->return_code = _rmnet_is_physical_endpoint_associated(dev);
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNDATA;
dev_put(dev);
}
static void _rmnet_netlink_get_link_egress_data_format
(struct rmnet_nl_msg_s *rmnet_header,
struct rmnet_nl_msg_s *resp_rmnet)
{
struct net_device *dev;
struct rmnet_phys_ep_config *config;
if (!rmnet_header || !resp_rmnet)
return;
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
dev = dev_get_by_name(&init_net, rmnet_header->data_format.dev);
if (!dev) {
resp_rmnet->return_code = RMNET_CONFIG_NO_SUCH_DEVICE;
return;
}
config = _rmnet_get_phys_ep_config(dev);
if (!config) {
resp_rmnet->return_code = RMNET_CONFIG_INVALID_REQUEST;
dev_put(dev);
return;
}
/* Begin Data */
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNDATA;
resp_rmnet->arg_length = sizeof(((struct rmnet_nl_msg_s *)0)
->data_format);
resp_rmnet->data_format.flags = config->egress_data_format;
resp_rmnet->data_format.agg_count = config->egress_agg_count;
resp_rmnet->data_format.agg_size = config->egress_agg_size;
dev_put(dev);
}
static void _rmnet_netlink_get_link_ingress_data_format
(struct rmnet_nl_msg_s *rmnet_header,
struct rmnet_nl_msg_s *resp_rmnet)
{
struct net_device *dev;
struct rmnet_phys_ep_config *config;
if (!rmnet_header || !resp_rmnet)
return;
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
dev = dev_get_by_name(&init_net, rmnet_header->data_format.dev);
if (!dev) {
resp_rmnet->return_code = RMNET_CONFIG_NO_SUCH_DEVICE;
return;
}
config = _rmnet_get_phys_ep_config(dev);
if (!config) {
resp_rmnet->return_code = RMNET_CONFIG_INVALID_REQUEST;
dev_put(dev);
return;
}
/* Begin Data */
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNDATA;
resp_rmnet->arg_length = sizeof(((struct rmnet_nl_msg_s *)0)
->data_format);
resp_rmnet->data_format.flags = config->ingress_data_format;
resp_rmnet->data_format.tail_spacing = config->tail_spacing;
dev_put(dev);
}
static void _rmnet_netlink_get_vnd_name
(struct rmnet_nl_msg_s *rmnet_header,
struct rmnet_nl_msg_s *resp_rmnet)
{
int r;
if (!rmnet_header || !resp_rmnet)
return;
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
r = rmnet_vnd_get_name(rmnet_header->vnd.id, resp_rmnet->vnd.vnd_name,
RMNET_MAX_STR_LEN);
if (r != 0) {
resp_rmnet->return_code = RMNET_CONFIG_INVALID_REQUEST;
return;
}
/* Begin Data */
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNDATA;
resp_rmnet->arg_length = sizeof(((struct rmnet_nl_msg_s *)0)->vnd);
}
static void _rmnet_netlink_add_del_vnd_tc_flow
(u32 command,
struct rmnet_nl_msg_s *rmnet_header,
struct rmnet_nl_msg_s *resp_rmnet)
{
u32 id;
u32 map_flow_id;
u32 tc_flow_id;
if (!rmnet_header || !resp_rmnet)
return;
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
id = rmnet_header->flow_control.id;
map_flow_id = rmnet_header->flow_control.map_flow_id;
tc_flow_id = rmnet_header->flow_control.tc_flow_id;
switch (command) {
case RMNET_NETLINK_ADD_VND_TC_FLOW:
resp_rmnet->return_code = rmnet_vnd_add_tc_flow(id,
map_flow_id,
tc_flow_id);
break;
case RMNET_NETLINK_DEL_VND_TC_FLOW:
resp_rmnet->return_code = rmnet_vnd_del_tc_flow(id,
map_flow_id,
tc_flow_id);
break;
default:
LOGM("Called with unhandled command %d", command);
resp_rmnet->return_code = RMNET_CONFIG_INVALID_REQUEST;
break;
}
}
/* rmnet_config_netlink_msg_handler() - Netlink message handler callback
* @skb: Packet containing netlink messages
*
* Standard kernel-expected format for a netlink message handler. Processes SKBs
* which contain RmNet data specific netlink messages.
*/
void rmnet_config_netlink_msg_handler(struct sk_buff *skb)
{
struct nlmsghdr *nlmsg_header, *resp_nlmsg;
struct rmnet_nl_msg_s *rmnet_header, *resp_rmnet;
int return_pid, response_data_length;
struct sk_buff *skb_response;
response_data_length = 0;
nlmsg_header = (struct nlmsghdr *)skb->data;
rmnet_header = (struct rmnet_nl_msg_s *)nlmsg_data(nlmsg_header);
if (!nlmsg_header->nlmsg_pid ||
(nlmsg_header->nlmsg_len < sizeof(struct nlmsghdr) +
sizeof(struct rmnet_nl_msg_s)))
return;
LOGL("Netlink message pid=%d, seq=%d, length=%d, rmnet_type=%d",
nlmsg_header->nlmsg_pid,
nlmsg_header->nlmsg_seq,
nlmsg_header->nlmsg_len,
rmnet_header->message_type);
return_pid = nlmsg_header->nlmsg_pid;
skb_response = nlmsg_new(sizeof(struct nlmsghdr)
+ sizeof(struct rmnet_nl_msg_s),
GFP_KERNEL);
if (!skb_response) {
LOGH("%s", "Failed to allocate response buffer");
return;
}
resp_nlmsg = nlmsg_put(skb_response,
0,
nlmsg_header->nlmsg_seq,
NLMSG_DONE,
sizeof(struct rmnet_nl_msg_s),
0);
resp_rmnet = nlmsg_data(resp_nlmsg);
if (!resp_rmnet)
return;
resp_rmnet->message_type = rmnet_header->message_type;
rtnl_lock();
switch (rmnet_header->message_type) {
case RMNET_NETLINK_ASSOCIATE_NETWORK_DEVICE:
_rmnet_netlink_associate_network_device
(rmnet_header, resp_rmnet);
break;
case RMNET_NETLINK_UNASSOCIATE_NETWORK_DEVICE:
_rmnet_netlink_unassociate_network_device
(rmnet_header, resp_rmnet);
break;
case RMNET_NETLINK_GET_NETWORK_DEVICE_ASSOCIATED:
_rmnet_netlink_get_network_device_associated
(rmnet_header, resp_rmnet);
break;
case RMNET_NETLINK_SET_LINK_EGRESS_DATA_FORMAT:
_rmnet_netlink_set_link_egress_data_format
(rmnet_header, resp_rmnet);
break;
case RMNET_NETLINK_GET_LINK_EGRESS_DATA_FORMAT:
_rmnet_netlink_get_link_egress_data_format
(rmnet_header, resp_rmnet);
break;
case RMNET_NETLINK_SET_LINK_INGRESS_DATA_FORMAT:
_rmnet_netlink_set_link_ingress_data_format
(rmnet_header, resp_rmnet);
break;
case RMNET_NETLINK_GET_LINK_INGRESS_DATA_FORMAT:
_rmnet_netlink_get_link_ingress_data_format
(rmnet_header, resp_rmnet);
break;
case RMNET_NETLINK_SET_LOGICAL_EP_CONFIG:
_rmnet_netlink_set_logical_ep_config(rmnet_header, resp_rmnet);
break;
case RMNET_NETLINK_UNSET_LOGICAL_EP_CONFIG:
_rmnet_netlink_unset_logical_ep_config(rmnet_header,
resp_rmnet);
break;
case RMNET_NETLINK_GET_LOGICAL_EP_CONFIG:
_rmnet_netlink_get_logical_ep_config(rmnet_header, resp_rmnet);
break;
case RMNET_NETLINK_NEW_VND:
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
resp_rmnet->return_code =
rmnet_create_vnd(rmnet_header->vnd.id);
break;
case RMNET_NETLINK_NEW_VND_WITH_PREFIX:
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
resp_rmnet->return_code = rmnet_create_vnd_prefix(
rmnet_header->vnd.id,
rmnet_header->vnd.vnd_name);
break;
case RMNET_NETLINK_NEW_VND_WITH_NAME:
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
resp_rmnet->return_code = rmnet_create_vnd_name(
rmnet_header->vnd.id,
rmnet_header->vnd.vnd_name);
break;
case RMNET_NETLINK_FREE_VND:
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
/* Please check rmnet_vnd_free_dev documentation regarding
* the below locking sequence
*/
rtnl_unlock();
resp_rmnet->return_code = rmnet_free_vnd(rmnet_header->vnd.id);
rtnl_lock();
break;
case RMNET_NETLINK_GET_VND_NAME:
_rmnet_netlink_get_vnd_name(rmnet_header, resp_rmnet);
break;
case RMNET_NETLINK_DEL_VND_TC_FLOW:
case RMNET_NETLINK_ADD_VND_TC_FLOW:
_rmnet_netlink_add_del_vnd_tc_flow(rmnet_header->message_type,
rmnet_header,
resp_rmnet);
break;
default:
resp_rmnet->crd = RMNET_NETLINK_MSG_RETURNCODE;
resp_rmnet->return_code = RMNET_CONFIG_UNKNOWN_MESSAGE;
break;
}
rtnl_unlock();
nlmsg_unicast(nl_socket_handle, skb_response, return_pid);
LOGD("%s", "Done processing command");
}
/* Configuration API */
/* rmnet_unassociate_network_device() - Unassociate network device
* @dev: Device to unassociate
*
* Frees all structures generate for device. Unregisters rx_handler
* todo: needs to do some sanity verification first (is device in use, etc...)
*
* Return:
* - RMNET_CONFIG_OK if successful
* - RMNET_CONFIG_NO_SUCH_DEVICE dev is null
* - RMNET_CONFIG_INVALID_REQUEST if device is not already associated
* - RMNET_CONFIG_DEVICE_IN_USE if device has logical ep that wasn't unset
* - RMNET_CONFIG_UNKNOWN_ERROR net_device private section is null
*/
int rmnet_unassociate_network_device(struct net_device *dev)
{
struct rmnet_phys_ep_conf_s *config;
int config_id = RMNET_LOCAL_LOGICAL_ENDPOINT;
struct rmnet_logical_ep_conf_s *epconfig_l;
ASSERT_RTNL();
LOGL("(%s);", dev->name);
if (!dev)
return RMNET_CONFIG_NO_SUCH_DEVICE;
if (!_rmnet_is_physical_endpoint_associated(dev))
return RMNET_CONFIG_INVALID_REQUEST;
for (; config_id < RMNET_DATA_MAX_LOGICAL_EP; config_id++) {
epconfig_l = _rmnet_get_logical_ep(dev, config_id);
if (epconfig_l && epconfig_l->refcount)
return RMNET_CONFIG_DEVICE_IN_USE;
}
config = (struct rmnet_phys_ep_conf_s *)
rcu_dereference(dev->rx_handler_data);
if (!config)
return RMNET_CONFIG_UNKNOWN_ERROR;
kfree(config);
netdev_rx_handler_unregister(dev);
/* Explicitly release the reference from the device */
dev_put(dev);
trace_rmnet_unassociate(dev);
return RMNET_CONFIG_OK;
}
/* rmnet_set_ingress_data_format() - Set ingress data format on network device
* @dev: Device to ingress data format on
* @egress_data_format: 32-bit unsigned bitmask of ingress format
*
* Network device must already have association with RmNet Data driver
*
* Return:
* - RMNET_CONFIG_OK if successful
* - RMNET_CONFIG_NO_SUCH_DEVICE dev is null
* - RMNET_CONFIG_UNKNOWN_ERROR net_device private section is null
*/
int rmnet_set_ingress_data_format(struct net_device *dev,
u32 ingress_data_format,
uint8_t tail_spacing)
{
struct rmnet_phys_ep_config *config;
ASSERT_RTNL();
LOGL("(%s,0x%08X);", dev->name, ingress_data_format);
if (!dev)
return RMNET_CONFIG_NO_SUCH_DEVICE;
config = _rmnet_get_phys_ep_config(dev);
if (!config)
return RMNET_CONFIG_INVALID_REQUEST;
config->ingress_data_format = ingress_data_format;
config->tail_spacing = tail_spacing;
return RMNET_CONFIG_OK;
}
/* rmnet_set_egress_data_format() - Set egress data format on network device
* @dev: Device to egress data format on
* @egress_data_format: 32-bit unsigned bitmask of egress format
*
* Network device must already have association with RmNet Data driver
* todo: Bounds check on agg_*
*
* Return:
* - RMNET_CONFIG_OK if successful
* - RMNET_CONFIG_NO_SUCH_DEVICE dev is null
* - RMNET_CONFIG_UNKNOWN_ERROR net_device private section is null
*/
int rmnet_set_egress_data_format(struct net_device *dev,
u32 egress_data_format,
u16 agg_size,
u16 agg_count)
{
struct rmnet_phys_ep_config *config;
ASSERT_RTNL();
LOGL("(%s,0x%08X, %d, %d);",
dev->name, egress_data_format, agg_size, agg_count);
if (!dev)
return RMNET_CONFIG_NO_SUCH_DEVICE;
config = _rmnet_get_phys_ep_config(dev);
if (!config)
return RMNET_CONFIG_UNKNOWN_ERROR;
config->egress_data_format = egress_data_format;
config->egress_agg_size = agg_size;
config->egress_agg_count = agg_count;
return RMNET_CONFIG_OK;
}
/* rmnet_associate_network_device() - Associate network device
* @dev: Device to register with RmNet data
*
* Typically used on physical network devices. Registers RX handler and private
* metadata structures.
*
* Return:
* - RMNET_CONFIG_OK if successful
* - RMNET_CONFIG_NO_SUCH_DEVICE dev is null
* - RMNET_CONFIG_INVALID_REQUEST if the device to be associated is a vnd
* - RMNET_CONFIG_DEVICE_IN_USE if dev rx_handler is already filled
* - RMNET_CONFIG_DEVICE_IN_USE if netdev_rx_handler_register() fails
*/
int rmnet_associate_network_device(struct net_device *dev)
{
struct rmnet_phys_ep_conf_s *config;
struct rmnet_phys_ep_config *conf;
int rc;
ASSERT_RTNL();
LOGL("(%s);\n", dev->name);
if (!dev)
return RMNET_CONFIG_NO_SUCH_DEVICE;
if (_rmnet_is_physical_endpoint_associated(dev)) {
LOGM("%s is already regestered", dev->name);
return RMNET_CONFIG_DEVICE_IN_USE;
}
if (rmnet_vnd_is_vnd(dev)) {
LOGM("%s is a vnd", dev->name);
return RMNET_CONFIG_INVALID_REQUEST;
}
config = kmalloc(sizeof(*config), GFP_ATOMIC);
conf = kmalloc(sizeof(*conf), GFP_ATOMIC);
if (!config || !conf)
return RMNET_CONFIG_NOMEM;
memset(config, 0, sizeof(struct rmnet_phys_ep_conf_s));
memset(conf, 0, sizeof(struct rmnet_phys_ep_config));
config->config = conf;
conf->dev = dev;
spin_lock_init(&conf->agg_lock);
config->recycle = kfree_skb;
rc = netdev_rx_handler_register(dev, rmnet_rx_handler, config);
if (rc) {
LOGM("netdev_rx_handler_register returns %d", rc);
kfree(config);
kfree(conf);
return RMNET_CONFIG_DEVICE_IN_USE;
}
/* Explicitly hold a reference to the device */
dev_hold(dev);
trace_rmnet_associate(dev);
return RMNET_CONFIG_OK;
}
/* _rmnet_set_logical_endpoint_config() - Set logical endpoing config on device
* @dev: Device to set endpoint configuration on
* @config_id: logical endpoint id on device
* @epconfig: endpoing configuration structure to set
*
* Return:
* - RMNET_CONFIG_OK if successful
* - RMNET_CONFIG_UNKNOWN_ERROR net_device private section is null
* - RMNET_CONFIG_NO_SUCH_DEVICE if device to set config on is null
* - RMNET_CONFIG_DEVICE_IN_USE if device already has a logical ep
* - RMNET_CONFIG_BAD_ARGUMENTS if logical endpoint id is out of range
*/
int _rmnet_set_logical_endpoint_config(struct net_device *dev,
int config_id,
struct rmnet_logical_ep_conf_s *epconfig)
{
struct rmnet_logical_ep_conf_s *epconfig_l;
ASSERT_RTNL();
if (!dev)
return RMNET_CONFIG_NO_SUCH_DEVICE;
if (config_id < RMNET_LOCAL_LOGICAL_ENDPOINT ||
config_id >= RMNET_DATA_MAX_LOGICAL_EP)
return RMNET_CONFIG_BAD_ARGUMENTS;
epconfig_l = _rmnet_get_logical_ep(dev, config_id);
if (!epconfig_l)
return RMNET_CONFIG_UNKNOWN_ERROR;
if (epconfig_l->refcount)
return RMNET_CONFIG_DEVICE_IN_USE;
memcpy(epconfig_l, epconfig, sizeof(struct rmnet_logical_ep_conf_s));
if (config_id == RMNET_LOCAL_LOGICAL_ENDPOINT)
epconfig_l->mux_id = 0;
else
epconfig_l->mux_id = config_id;
/* Explicitly hold a reference to the egress device */
dev_hold(epconfig_l->egress_dev);
return RMNET_CONFIG_OK;
}
/* _rmnet_unset_logical_endpoint_config() - Un-set the logical endpoing config
* on device
* @dev: Device to set endpoint configuration on
* @config_id: logical endpoint id on device
*
* Return:
* - RMNET_CONFIG_OK if successful
* - RMNET_CONFIG_UNKNOWN_ERROR net_device private section is null
* - RMNET_CONFIG_NO_SUCH_DEVICE if device to set config on is null
* - RMNET_CONFIG_BAD_ARGUMENTS if logical endpoint id is out of range
*/
int _rmnet_unset_logical_endpoint_config(struct net_device *dev,
int config_id)
{
struct rmnet_logical_ep_conf_s *epconfig_l = 0;
ASSERT_RTNL();
if (!dev)
return RMNET_CONFIG_NO_SUCH_DEVICE;
if (config_id < RMNET_LOCAL_LOGICAL_ENDPOINT ||
config_id >= RMNET_DATA_MAX_LOGICAL_EP)
return RMNET_CONFIG_BAD_ARGUMENTS;
epconfig_l = _rmnet_get_logical_ep(dev, config_id);
if (!epconfig_l || !epconfig_l->refcount)
return RMNET_CONFIG_NO_SUCH_DEVICE;
/* Explicitly release the reference from the egress device */
dev_put(epconfig_l->egress_dev);
memset(epconfig_l, 0, sizeof(struct rmnet_logical_ep_conf_s));
return RMNET_CONFIG_OK;
}
/* rmnet_set_logical_endpoint_config() - Set logical endpoint config on a device
* @dev: Device to set endpoint configuration on
* @config_id: logical endpoint id on device
* @rmnet_mode: endpoint mode. Values from: rmnet_config_endpoint_modes_e
* @egress_device: device node to forward packet to once done processing in
* ingress/egress handlers
*
* Creates a logical_endpoint_config structure and fills in the information from
* function arguments. Calls _rmnet_set_logical_endpoint_config() to finish
* configuration. Network device must already have association with RmNet Data
* driver
*
* Return:
* - RMNET_CONFIG_OK if successful
* - RMNET_CONFIG_BAD_EGRESS_DEVICE if egress device is null
* - RMNET_CONFIG_BAD_EGRESS_DEVICE if egress device is not handled by
* RmNet data module
* - RMNET_CONFIG_UNKNOWN_ERROR net_device private section is null
* - RMNET_CONFIG_NO_SUCH_DEVICE if device to set config on is null
* - RMNET_CONFIG_BAD_ARGUMENTS if logical endpoint id is out of range
*/
int rmnet_set_logical_endpoint_config(struct net_device *dev,
int config_id,
u8 rmnet_mode,
struct net_device *egress_dev)
{
struct rmnet_logical_ep_conf_s epconfig;
LOGL("(%s, %d, %d, %s);",
dev->name, config_id, rmnet_mode, egress_dev->name);
if (!egress_dev ||
((!_rmnet_is_physical_endpoint_associated(egress_dev)) &&
(!rmnet_vnd_is_vnd(egress_dev)))) {
return RMNET_CONFIG_BAD_EGRESS_DEVICE;
}
memset(&epconfig, 0, sizeof(struct rmnet_logical_ep_conf_s));
epconfig.refcount = 1;
epconfig.rmnet_mode = rmnet_mode;
epconfig.egress_dev = egress_dev;
return _rmnet_set_logical_endpoint_config(dev, config_id, &epconfig);
}
/* rmnet_unset_logical_endpoint_config() - Un-set logical endpoing configuration
* on a device
* @dev: Device to set endpoint configuration on
* @config_id: logical endpoint id on device
*
* Retrieves the logical_endpoint_config structure and frees the egress device.
* Network device must already have association with RmNet Data driver
*
* Return:
* - RMNET_CONFIG_OK if successful
* - RMNET_CONFIG_UNKNOWN_ERROR net_device private section is null
* - RMNET_CONFIG_NO_SUCH_DEVICE device is not associated
* - RMNET_CONFIG_BAD_ARGUMENTS if logical endpoint id is out of range
*/
int rmnet_unset_logical_endpoint_config(struct net_device *dev,
int config_id)
{
LOGL("(%s, %d);", dev->name, config_id);
if (!dev || ((!_rmnet_is_physical_endpoint_associated(dev)) &&
(!rmnet_vnd_is_vnd(dev)))) {
return RMNET_CONFIG_NO_SUCH_DEVICE;
}
return _rmnet_unset_logical_endpoint_config(dev, config_id);
}
/* rmnet_get_logical_endpoint_config() - Gets logical endpoing configuration
* for a device
* @dev: Device to get endpoint configuration on
* @config_id: logical endpoint id on device
* @rmnet_mode: (I/O) logical endpoint mode
* @egress_dev_name: (I/O) logical endpoint egress device name
* @egress_dev_name_size: The maximal size of the I/O egress_dev_name
*
* Retrieves the logical_endpoint_config structure.
* Network device must already have association with RmNet Data driver
*
* Return:
* - RMNET_CONFIG_OK if successful
* - RMNET_CONFIG_UNKNOWN_ERROR net_device private section is null
* - RMNET_CONFIG_NO_SUCH_DEVICE device is not associated
* - RMNET_CONFIG_BAD_ARGUMENTS if logical endpoint id is out of range or
* if the provided buffer size for egress dev name is too short
*/
int rmnet_get_logical_endpoint_config(struct net_device *dev,
int config_id,
u8 *rmnet_mode,
u8 *egress_dev_name,
size_t egress_dev_name_size)
{
struct rmnet_logical_ep_conf_s *epconfig_l = 0;
size_t strlcpy_res = 0;
LOGL("(%s, %d);", dev->name, config_id);
if (!egress_dev_name || !rmnet_mode)
return RMNET_CONFIG_BAD_ARGUMENTS;
if (config_id < RMNET_LOCAL_LOGICAL_ENDPOINT ||
config_id >= RMNET_DATA_MAX_LOGICAL_EP)
return RMNET_CONFIG_BAD_ARGUMENTS;
epconfig_l = _rmnet_get_logical_ep(dev, config_id);
if (!epconfig_l || !epconfig_l->refcount)
return RMNET_CONFIG_NO_SUCH_DEVICE;
*rmnet_mode = epconfig_l->rmnet_mode;
strlcpy_res = strlcpy(egress_dev_name, epconfig_l->egress_dev->name,
egress_dev_name_size);
if (strlcpy_res >= egress_dev_name_size)
return RMNET_CONFIG_BAD_ARGUMENTS;
return RMNET_CONFIG_OK;
}
/* rmnet_create_vnd() - Create virtual network device node
* @id: RmNet virtual device node id
*
* Return:
* - result of rmnet_vnd_create_dev()
*/
int rmnet_create_vnd(int id)
{
struct net_device *dev;
ASSERT_RTNL();
LOGL("(%d);", id);
return rmnet_vnd_create_dev(id, &dev, NULL, 0);
}
/* rmnet_create_vnd_prefix() - Create virtual network device node
* @id: RmNet virtual device node id
* @prefix: String prefix for device name
*
* Return:
* - result of rmnet_vnd_create_dev()
*/
int rmnet_create_vnd_prefix(int id, const char *prefix)
{
struct net_device *dev;
ASSERT_RTNL();
LOGL("(%d, \"%s\");", id, prefix);
return rmnet_vnd_create_dev(id, &dev, prefix, 0);
}
/**
* rmnet_create_vnd_name() - Create virtual network device node
* @id: RmNet virtual device node id
* @prefix: String prefix for device name
*
* Return:
* - result of rmnet_vnd_create_dev()
*/
int rmnet_create_vnd_name(int id, const char *name)
{
struct net_device *dev;
ASSERT_RTNL();
LOGL("(%d, \"%s\");", id, name);
return rmnet_vnd_create_dev(id, &dev, name, 1);
}
/* rmnet_free_vnd() - Free virtual network device node
* @id: RmNet virtual device node id
*
* Return:
* - result of rmnet_vnd_free_dev()
*/
int rmnet_free_vnd(int id)
{
LOGL("(%d);", id);
return rmnet_vnd_free_dev(id);
}
static void _rmnet_free_vnd_later(struct work_struct *work)
{
int i;
struct rmnet_free_vnd_work *fwork;
fwork = container_of(work, struct rmnet_free_vnd_work, work);
for (i = 0; i < fwork->count; i++)
rmnet_free_vnd(fwork->vnd_id[i]);
kfree(fwork);
}
/* rmnet_force_unassociate_device() - Force a device to unassociate
* @dev: Device to unassociate
*
* Return:
* - void
*/
static void rmnet_force_unassociate_device(struct net_device *dev)
{
int i, j;
struct net_device *vndev;
struct rmnet_logical_ep_conf_s *cfg;
struct rmnet_free_vnd_work *vnd_work;
ASSERT_RTNL();
if (!dev)
return;
if (!_rmnet_is_physical_endpoint_associated(dev)) {
LOGM("%s", "Called on unassociated device, skipping");
return;
}
trace_rmnet_unregister_cb_clear_vnds(dev);
vnd_work = kmalloc(sizeof(*vnd_work), GFP_KERNEL);
if (!vnd_work) {
LOGH("%s", "Out of Memory");
return;
}
INIT_WORK(&vnd_work->work, _rmnet_free_vnd_later);
vnd_work->count = 0;
/* Check the VNDs for offending mappings */
for (i = 0, j = 0; i < RMNET_DATA_MAX_VND &&
j < RMNET_DATA_MAX_VND; i++) {
vndev = rmnet_vnd_get_by_id(i);
if (!vndev) {
LOGL("VND %d not in use; skipping", i);
continue;
}
cfg = rmnet_vnd_get_le_config(vndev);
if (!cfg) {
LOGH("Got NULL config from VND %d", i);
continue;
}
if (cfg->refcount && (cfg->egress_dev == dev)) {
/* Make sure the device is down before clearing any of
* the mappings. Otherwise we could see a potential
* race condition if packets are actively being
* transmitted.
*/
dev_close(vndev);
rmnet_unset_logical_endpoint_config
(vndev, RMNET_LOCAL_LOGICAL_ENDPOINT);
vnd_work->vnd_id[j] = i;
j++;
}
}
if (j > 0) {
vnd_work->count = j;
schedule_work(&vnd_work->work);
} else {
kfree(vnd_work);
}
/* Clear the mappings on the phys ep */
trace_rmnet_unregister_cb_clear_lepcs(dev);
rmnet_unset_logical_endpoint_config(dev, RMNET_LOCAL_LOGICAL_ENDPOINT);
for (i = 0; i < RMNET_DATA_MAX_LOGICAL_EP; i++)
rmnet_unset_logical_endpoint_config(dev, i);
rmnet_unassociate_network_device(dev);
}
/* rmnet_config_notify_cb() - Callback for netdevice notifier chain
* @nb: Notifier block data
* @event: Netdevice notifier event ID
* @data: Contains a net device for which we are getting notified
*
* Return:
* - result of NOTIFY_DONE()
*/
int rmnet_config_notify_cb(struct notifier_block *nb,
unsigned long event, void *data)
{
struct net_device *dev = netdev_notifier_info_to_dev(data);
if (!dev)
return NOTIFY_DONE;
LOGL("(..., %lu, %s)", event, dev->name);
switch (event) {
case NETDEV_UNREGISTER_FINAL:
case NETDEV_UNREGISTER:
trace_rmnet_unregister_cb_entry(dev);
LOGH("Kernel is trying to unregister %s", dev->name);
rmnet_force_unassociate_device(dev);
trace_rmnet_unregister_cb_exit(dev);
break;
default:
trace_rmnet_unregister_cb_unhandled(dev);
LOGD("Unhandeled event [%lu]", event);
break;
}
return NOTIFY_DONE;
}