/* Copyright (c) 2013-2018, 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.
|
*/
|
|
#include <linux/netdevice.h>
|
#include "rmnet_config.h"
|
#include "rmnet_map.h"
|
#include "rmnet_private.h"
|
#include "rmnet_vnd.h"
|
|
static u8 rmnet_map_do_flow_control(struct sk_buff *skb,
|
struct rmnet_port *port,
|
int enable)
|
{
|
struct rmnet_map_control_command *cmd;
|
struct rmnet_endpoint *ep;
|
struct net_device *vnd;
|
u16 ip_family;
|
u16 fc_seq;
|
u32 qos_id;
|
u8 mux_id;
|
int r;
|
|
mux_id = RMNET_MAP_GET_MUX_ID(skb);
|
cmd = RMNET_MAP_GET_CMD_START(skb);
|
|
if (mux_id >= RMNET_MAX_LOGICAL_EP) {
|
kfree_skb(skb);
|
return RX_HANDLER_CONSUMED;
|
}
|
|
ep = rmnet_get_endpoint(port, mux_id);
|
if (!ep) {
|
kfree_skb(skb);
|
return RX_HANDLER_CONSUMED;
|
}
|
|
vnd = ep->egress_dev;
|
|
ip_family = cmd->flow_control.ip_family;
|
fc_seq = ntohs(cmd->flow_control.flow_control_seq_num);
|
qos_id = ntohl(cmd->flow_control.qos_id);
|
|
/* Ignore the ip family and pass the sequence number for both v4 and v6
|
* sequence. User space does not support creating dedicated flows for
|
* the 2 protocols
|
*/
|
r = rmnet_vnd_do_flow_control(vnd, enable);
|
if (r) {
|
kfree_skb(skb);
|
return RMNET_MAP_COMMAND_UNSUPPORTED;
|
} else {
|
return RMNET_MAP_COMMAND_ACK;
|
}
|
}
|
|
static void rmnet_map_send_ack(struct sk_buff *skb,
|
unsigned char type,
|
struct rmnet_port *port)
|
{
|
struct rmnet_map_control_command *cmd;
|
struct net_device *dev = skb->dev;
|
|
if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4)
|
skb_trim(skb,
|
skb->len - sizeof(struct rmnet_map_dl_csum_trailer));
|
|
skb->protocol = htons(ETH_P_MAP);
|
|
cmd = RMNET_MAP_GET_CMD_START(skb);
|
cmd->cmd_type = type & 0x03;
|
|
netif_tx_lock(dev);
|
dev->netdev_ops->ndo_start_xmit(skb, dev);
|
netif_tx_unlock(dev);
|
}
|
|
/* Process MAP command frame and send N/ACK message as appropriate. Message cmd
|
* name is decoded here and appropriate handler is called.
|
*/
|
void rmnet_map_command(struct sk_buff *skb, struct rmnet_port *port)
|
{
|
struct rmnet_map_control_command *cmd;
|
unsigned char command_name;
|
unsigned char rc = 0;
|
|
cmd = RMNET_MAP_GET_CMD_START(skb);
|
command_name = cmd->command_name;
|
|
switch (command_name) {
|
case RMNET_MAP_COMMAND_FLOW_ENABLE:
|
rc = rmnet_map_do_flow_control(skb, port, 1);
|
break;
|
|
case RMNET_MAP_COMMAND_FLOW_DISABLE:
|
rc = rmnet_map_do_flow_control(skb, port, 0);
|
break;
|
|
default:
|
rc = RMNET_MAP_COMMAND_UNSUPPORTED;
|
kfree_skb(skb);
|
break;
|
}
|
if (rc == RMNET_MAP_COMMAND_ACK)
|
rmnet_map_send_ack(skb, rc, port);
|
}
|
