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/*
* Copyright (c) 2013-2016, 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/module.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/rmnet_data.h>
#include <linux/net_map.h>
#include <net/pkt_sched.h>
#include <net/rmnet_config.h>
#include "rmnet_data_config.h"
#include "rmnet_map.h"
#include "rmnet_data_private.h"
#include "rmnet_data_vnd.h"
#include "rmnet_data_stats.h"
RMNET_LOG_MODULE(RMNET_DATA_LOGMASK_MAPC);
unsigned long int rmnet_map_command_stats[RMNET_MAP_COMMAND_ENUM_LENGTH];
module_param_array(rmnet_map_command_stats, ulong, 0, S_IRUGO);
MODULE_PARM_DESC(rmnet_map_command_stats, "MAP command statistics");
/**
* rmnet_map_do_flow_control() - Process MAP flow control command
* @skb: Socket buffer containing the MAP flow control message
* @config: Physical end-point configuration of ingress device
* @enable: boolean for enable/disable
*
* Process in-band MAP flow control messages. Assumes mux ID is mapped to a
* RmNet Data vitrual network device.
*
* Return:
* - RMNET_MAP_COMMAND_UNSUPPORTED on any error
* - RMNET_MAP_COMMAND_ACK on success
*/
static uint8_t rmnet_map_do_flow_control(struct sk_buff *skb,
struct rmnet_phys_ep_config *config,
int enable)
{
struct rmnet_map_control_command_s *cmd;
struct net_device *vnd;
struct rmnet_logical_ep_conf_s *ep;
uint8_t mux_id;
uint16_t ip_family;
uint16_t fc_seq;
uint32_t qos_id;
int r;
if (unlikely(!skb || !config))
BUG();
mux_id = RMNET_MAP_GET_MUX_ID(skb);
cmd = RMNET_MAP_GET_CMD_START(skb);
if (mux_id >= RMNET_DATA_MAX_LOGICAL_EP) {
LOGD("Got packet on %s with bad mux id %d",
skb->dev->name, mux_id);
rmnet_kfree_skb(skb, RMNET_STATS_SKBFREE_MAPC_BAD_MUX);
return RX_HANDLER_CONSUMED;
}
ep = &(config->muxed_ep[mux_id]);
if (!ep->refcount) {
LOGD("Packet on %s:%d; has no logical endpoint config",
skb->dev->name, mux_id);
rmnet_kfree_skb(skb, RMNET_STATS_SKBFREE_MAPC_MUX_NO_EP);
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, qos_id, fc_seq, fc_seq, enable);
LOGD("dev:%s, qos_id:0x%08X, ip_family:%hd, fc_seq %hd, en:%d",
skb->dev->name, qos_id, ip_family & 3, fc_seq, enable);
if (r) {
rmnet_kfree_skb(skb, RMNET_STATS_SKBFREE_MAPC_UNSUPPORTED);
return RMNET_MAP_COMMAND_UNSUPPORTED;
} else {
return RMNET_MAP_COMMAND_ACK;
}
}
/**
* rmnet_map_send_ack() - Send N/ACK message for MAP commands
* @skb: Socket buffer containing the MAP command message
* @type: N/ACK message selector
* @config: Physical end-point configuration of ingress device
*
* skb is modified to contain the message type selector. The message is then
* transmitted on skb->dev. Note that this function grabs global Tx lock on
* skb->dev for latency reasons.
*
* Return:
* - void
*/
static void rmnet_map_send_ack(struct sk_buff *skb,
unsigned char type,
struct rmnet_phys_ep_config *config)
{
struct rmnet_map_control_command_s *cmd;
int xmit_status;
int rc;
if (unlikely(!skb))
BUG();
skb->protocol = htons(ETH_P_MAP);
if ((config->ingress_data_format & RMNET_INGRESS_FORMAT_MAP_CKSUMV3) ||
(config->ingress_data_format & RMNET_INGRESS_FORMAT_MAP_CKSUMV4)) {
if (unlikely(skb->len < (sizeof(struct rmnet_map_header_s) +
+ RMNET_MAP_GET_LENGTH(skb)
+ sizeof(struct rmnet_map_dl_checksum_trailer_s)))) {
rmnet_stats_dl_checksum(
RMNET_MAP_CHECKSUM_ERR_BAD_BUFFER);
return;
}
skb_trim(skb, skb->len -
sizeof(struct rmnet_map_dl_checksum_trailer_s));
}
cmd = RMNET_MAP_GET_CMD_START(skb);
cmd->cmd_type = type & 0x03;
netif_tx_lock(skb->dev);
xmit_status = skb->dev->netdev_ops->ndo_start_xmit(skb, skb->dev);
netif_tx_unlock(skb->dev);
LOGD("MAP command ACK=%hhu sent with rc: %d", type & 0x03, xmit_status);
if (xmit_status != NETDEV_TX_OK) {
rc = dev_queue_xmit(skb);
if (rc != 0) {
LOGD("Failed to queue packet for transmission on [%s]",
skb->dev->name);
}
}
}
/**
* rmnet_map_command() - Entry point for handling MAP commands
* @skb: Socket buffer containing the MAP command message
* @config: Physical end-point configuration of ingress device
*
* Process MAP command frame and send N/ACK message as appropriate. Message cmd
* name is decoded here and appropriate handler is called.
*
* Return:
* - RX_HANDLER_CONSUMED. Command frames are always consumed.
*/
rx_handler_result_t rmnet_map_command(struct sk_buff *skb,
struct rmnet_phys_ep_config *config)
{
struct rmnet_map_control_command_s *cmd;
unsigned char command_name;
unsigned char rc = 0;
if (unlikely(!skb))
BUG();
cmd = RMNET_MAP_GET_CMD_START(skb);
command_name = cmd->command_name;
if (command_name < RMNET_MAP_COMMAND_ENUM_LENGTH)
rmnet_map_command_stats[command_name]++;
switch (command_name) {
case RMNET_MAP_COMMAND_FLOW_ENABLE:
rc = rmnet_map_do_flow_control(skb, config, 1);
break;
case RMNET_MAP_COMMAND_FLOW_DISABLE:
rc = rmnet_map_do_flow_control(skb, config, 0);
break;
default:
rmnet_map_command_stats[RMNET_MAP_COMMAND_UNKNOWN]++;
LOGM("Uknown MAP command: %d", command_name);
rc = RMNET_MAP_COMMAND_UNSUPPORTED;
rmnet_kfree_skb(skb, RMNET_STATS_SKBFREE_MAPC_UNSUPPORTED);
break;
}
if (rc == RMNET_MAP_COMMAND_ACK)
rmnet_map_send_ack(skb, rc, config);
return RX_HANDLER_CONSUMED;
}
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