linux/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c

// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2013-2018, 2021, The Linux Foundation. All rights reserved.
 *
 * RMNET Data ingress/egress handler
 */

#include <linux/netdevice.h>
#include <linux/netdev_features.h>
#include <linux/if_arp.h>
#include <net/sock.h>
#include "rmnet_private.h"
#include "rmnet_config.h"
#include "rmnet_vnd.h"
#include "rmnet_map.h"
#include "rmnet_handlers.h"

#define RMNET_IP_VERSION_4 …
#define RMNET_IP_VERSION_6 …

/* Helper Functions */

static void rmnet_set_skb_proto(struct sk_buff *skb)
{ … }

/* Generic handler */

static void
rmnet_deliver_skb(struct sk_buff *skb)
{ … }

/* MAP handler */

static void
__rmnet_map_ingress_handler(struct sk_buff *skb,
			    struct rmnet_port *port)
{ … }

static void
rmnet_map_ingress_handler(struct sk_buff *skb,
			  struct rmnet_port *port)
{ … }

static int rmnet_map_egress_handler(struct sk_buff *skb,
				    struct rmnet_port *port, u8 mux_id,
				    struct net_device *orig_dev)
{ … }

static void
rmnet_bridge_handler(struct sk_buff *skb, struct net_device *bridge_dev)
{ … }

/* Ingress / Egress Entry Points */

/* Processes packet as per ingress data format for receiving device. Logical
 * endpoint is determined from packet inspection. Packet is then sent to the
 * egress device listed in the logical endpoint configuration.
 */
rx_handler_result_t rmnet_rx_handler(struct sk_buff **pskb)
{ … }

/* Modifies packet as per logical endpoint configuration and egress data format
 * for egress device configured in logical endpoint. Packet is then transmitted
 * on the egress device.
 */
void rmnet_egress_handler(struct sk_buff *skb)
{ … }