Merge "net/embms-kernel : EMBMS Tunneling Module" (a41c2a6c) · Commits · e / devices / android_kernel_fairphone_FP5

net/core/dev.c

+14 −0

Original line number	Original line	Diff line number	Diff line
	@@ -4718,6 +4718,18 @@ static inline int nf_ingress(struct sk_buff skb, struct packet_type *pt_prev,
	return 0;		return 0;
	}		}

			static int (embms_tm_multicast_recv)(struct sk_buff skb) __rcu __read_mostly;
			EXPORT_SYMBOL(embms_tm_multicast_recv);

			void process_embms_receive_skb(struct sk_buff *skb)
			{
			int (embms_recv)(struct sk_buff skb);

			embms_recv = rcu_dereference(embms_tm_multicast_recv);
			if (embms_recv)
			embms_recv(skb);
			}

	static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc,		static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc,
	struct packet_type **ppt_prev)		struct packet_type **ppt_prev)
	{		{
	@@ -4798,6 +4810,8 @@ static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc,
	}		}
	#endif		#endif
	skb_reset_redirect(skb);		skb_reset_redirect(skb);
			process_embms_receive_skb(skb);

	skip_classify:		skip_classify:
	if (pfmemalloc && !skb_pfmemalloc_protocol(skb))		if (pfmemalloc && !skb_pfmemalloc_protocol(skb))
	goto drop;		goto drop;

net/embms_kernel/embms_kernel/Makefile

0 → 100644

+23 −0

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			# SPDX-License-Identifier: GPL-2.0-only
			#
			# 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

net/embms_kernel/embms_kernel/embms_kernel.c

0 → 100644

+1025 −0

File added.

Preview size limit exceeded, changes collapsed.

net/embms_kernel/embms_kernel/embms_kernel.h

0 → 100644

+223 −0

Original line number	Original line	Diff line number	Diff line
			/* SPDX-License-Identifier: GPL-2.0-only */
			/* Copyright (c) 2013-2015,2017, 2018, 2020, The Linux Foundation. All rights reserved. */
			/******************************************************************
			* 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