Merge "net/embms-kernel : EMBMS Tunneling Module"

	return 0;

}

int (*embms_tm_multicast_recv)(struct sk_buff *skb) __rcu __read_mostly;

EXPORT_SYMBOL(embms_tm_multicast_recv);

static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc)

{

	struct packet_type *ptype, *pt_prev;

	bool deliver_exact = false;

	int ret = NET_RX_DROP;

	__be16 type;

	int (*embms_recv)(struct sk_buff *skb);

	net_timestamp_check(!netdev_tstamp_prequeue, skb);

	}

#endif

	skb_reset_tc(skb);

	embms_recv = rcu_dereference(embms_tm_multicast_recv);

	if (embms_recv)

		embms_recv(skb);

skip_classify:

	if (pfmemalloc && !skb_pfmemalloc_protocol(skb))

		goto drop;

#

# Makefile for Embms Kernel module.

#

KERNEL_SRC ?= /lib/modules/$(shell uname -r)/build

obj-m += embms_kernel.o

ccflags-y += -D__CHECK_ENDIAN__

CDEFINES += -D__CHECK_ENDIAN__

KBUILD_CPPFLAGS += $(CDEFINES)

all:

	$(MAKE) -C $(KERNEL_SRC) M=$(shell pwd) modules

modules_install:

	$(MAKE) INSTALL_MOD_STRIP=1 -C $(KERNEL_SRC) M=$(shell pwd) modules_install

clean:

	$(MAKE) -C $(KERNEL_SRC) M=$(PWD) clean

/******************************************************************

 * Copyright (c) 2013-2015,2017, 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.

 *---------------------------------------------------------------

 * DESCRIPTION

 * Header file for eMBMs Tunneling Module in kernel.

 *******************************************************************

 */

#ifndef EMBMS_H

#define EMBMS_H

#include <linux/ioctl.h>

#include <stdbool.h>

#include <linux/if_addr.h>

#include <linux/list.h>

#include <linux/ip.h>

#include <linux/miscdevice.h>

#include <linux/spinlock.h>

#include <linux/cdev.h>

#define EMBMS_MAX_IFACE_NAME    20

/* Defining IP and UDP header related macros*/

#define UDP_CHECKSUM                0

#define IP_VERSION                  4

#define IP_IHL                      5

#define IP_TOS                      0

#define IP_ID                       1

#define IP_FRAG_OFFSET              htons(0x4000)

#define IP_TTL                      64

#define BRIDGE_IFACE                "bridge0"

#define BUF_LEN 1024

#define TUNNELING_ON 1

#define TUNNELING_OFF 0

// definitions required for IOCTL

static unsigned int dev_num = 1;

/* Embms device used for communication*/

struct cdev embms_device;

static struct class *embms_class;

static dev_t device;

#define EMBMS_IOC_MAGIC 0x64

#define embms_debug pr_debug

#define embms_error pr_debug

/* The name of the device file*/

#define EMBMS_DEVICE_NAME "embms_tm_device"

extern int (*embms_tm_multicast_recv)(struct sk_buff *skb);

/**

 * enum embms_action_type - Describes action to perform

 * @ADD_CLIENT_ENTRY: add client entry to TMGI

 * @DELETE_CLIENT_ENTRY: deelte client entry from TMGI

 * @TMGI_DEACTIVATE: Delete TMGI entry

 * @CLIENT_ACTIVATE_ALL_TMGI: Add client to all TMGI

 * @CLIENT_DEACTIVATE_ALL_TMGI: Delete client from all TMGI

 * @SESSION_DEACTIVATE: Stop session

 * @SOCK_INFO: Socket information like V4 addr, port etc

 *

 * This enum defines the types of action which are

 * supported by this module.

 */

enum {

	ADD_CLIENT_ENTRY = 0,

	DELETE_CLIENT_ENTRY,

	TMGI_DEACTIVATE,

	CLIENT_ACTIVATE_ALL_TMGI,

	CLIENT_DEACTIVATE_ALL_TMGI,

	SESSION_DEACTIVATE,

	SOCK_INFO

} embms_action_type;

/**

 * struct tmgi_to_clnt_info_update - information for addition/deletion

 * @multicast_addr: TMGI multicast IP to receive data

 * @multicast_port: TMGI multicast port to receive date

 * @client_addr: Client IPV4 address for sending data

 * @client_port: Client port for sending data

 * @data_port: port used to send data to client

 * @action_type: Action to be performed

 * @iface_name: iface to listen to for data

 *

 * This structure contains information as to what action

 * needs to be performed on TMGI-client table. It is

 * sent as a parameter during an IOCTL call

 */

struct tmgi_to_clnt_info_update {

	u32 multicast_addr;

	u16 multicast_port;

	u32 client_addr;

	u16 client_port;

	u16 data_port;

	u32 action_type;

	char iface_name[EMBMS_MAX_IFACE_NAME];

};

/**

 * struct clnt_info - contains client information

 * @addr: Client IPV4 address for sending packets

 * @port: Client port for sending packets

 * @dmac: Client DMAC address

 * @client_list_ptr : list ptr used to maintain client list

 *

 * This structure maintains complete client information

 * to be used when sending packets to client

 */

struct clnt_info {

	u32 addr;

	u16 port;

	u8 dmac[ETH_ALEN];

	struct list_head client_list_ptr;

};

/**

 * struct tmgi_to_clnt_info - contains TMGI information

 * @tmgi_multicast_addr: TMGI IPV4 address to listen for packets

 * @tmgi_port: Client port to listen for packets

 * @no_of_clients: No of clients for a TMGI

 * @client_list_head : list head for client list

 * @tmgi_list_ptr : list ptr to maintain tmgi list

 *

 * This structure maintains complete client information

 * to be used when sending data to client

 */

struct tmgi_to_clnt_info {

	u32 tmgi_multicast_addr;

	u16 tmgi_port;

	u16 no_of_clients;

	struct list_head client_list_head;

	struct list_head tmgi_list_ptr;

};

/**

 * struct embms_info_internal - stores module specific params

 * @device_under_use: Used to prevent concurent access to the same device

 * @embms_data_port: Source Data port used for tunnelled packets

 * @embms_iface: Iface to receive embms traffic

 * @embms_tunneling_status : Current EMBMS Status

 * @no_of_tmgi_sessions : Number of current active TMGI sessions

 * @lock : Lock for concurrency scenarios

 * @ip_ident : IP identification number to be used for sent packets

 *

 * This tructure holds module specific information which is

 * used throughout the module to maintain consistency

 */

struct embms_info_internal {

	atomic_t device_under_use;

	int embms_data_port;

	char embms_iface[EMBMS_MAX_IFACE_NAME];

	int embms_tunneling_status;

	int no_of_tmgi_sessions;

	/*lock to prevent concurrent access*/

	spinlock_t lock;

	atomic_t ip_ident;

};

/* This ioctl is used to add a new client entry to tunneling module.

 * Entry params are populated in the struct used for ioctl

 */

#define ADD_EMBMS_TUNNEL _IOW(EMBMS_IOC_MAGIC, 0, \

		struct tmgi_to_clnt_info_update)

/* This ioctl is used to delete a client entry for a particular

 * TMGI from tunneling module.

 * Entry params are populated in the struct used for ioctl

 */

#define DEL_EMBMS_TUNNEL _IOW(EMBMS_IOC_MAGIC, 1, \

		struct tmgi_to_clnt_info_update)

/* This ioctl is used to delete a TMGI entry completely

 * from tunneling module.

 * Entry params are populated in the struct used for ioctl

 */

#define TMGI_DEACTIVATE _IOW(EMBMS_IOC_MAGIC, 2, \

		struct tmgi_to_clnt_info_update)

/* This ioctl is used to delete client entry completely

 * from tunneling module.

 * Entry params are populated in the struct used for ioctl

 */

#define CLIENT_DEACTIVATE _IOW(EMBMS_IOC_MAGIC, 3, \

		struct tmgi_to_clnt_info_update)

/* Gets the ON/OFF status of Tunneling module*/

#define GET_EMBMS_TUNNELING_STATUS _IO(EMBMS_IOC_MAGIC, 4)

/* Used to start tunneling. Argument is the port

 * number to be used to send

 * data to clients

 */

#define START_EMBMS_TUNNEL _IOW(EMBMS_IOC_MAGIC, 5, \

		struct tmgi_to_clnt_info_update)

/* Used to stop tunnleing*/

#define STOP_EMBMS_TUNNEL _IO(EMBMS_IOC_MAGIC, 6)

/* Return values indicating error status*/

#define SUCCESS               0         /* Successful operation*/

#define FAILURE               -1         /* Unsuccessful operation*/

/* Error Condition Values*/

#define ENOMEM                -2        /* Out of memory*/

#define EBADPARAM             -3        /* Incorrect parameters passed*/

#define ENOEFFECT             -4        /* No Effect*/

#endif