103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
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*/
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#include <linux/netdevice.h>
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#include "rmnet_config.h"
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#include "rmnet_map.h"
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#include "rmnet_private.h"
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#include "rmnet_vnd.h"
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static u8 rmnet_map_do_flow_control(struct sk_buff *skb,
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struct rmnet_port *port,
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int enable)
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{
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struct rmnet_map_header *map_header = (void *)skb->data;
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struct rmnet_endpoint *ep;
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struct net_device *vnd;
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u8 mux_id;
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int r;
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mux_id = map_header->mux_id;
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if (mux_id >= RMNET_MAX_LOGICAL_EP) {
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kfree_skb(skb);
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return RX_HANDLER_CONSUMED;
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}
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ep = rmnet_get_endpoint(port, mux_id);
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if (!ep) {
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kfree_skb(skb);
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return RX_HANDLER_CONSUMED;
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}
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vnd = ep->egress_dev;
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/* Ignore the ip family and pass the sequence number for both v4 and v6
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* sequence. User space does not support creating dedicated flows for
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* the 2 protocols
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*/
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r = rmnet_vnd_do_flow_control(vnd, enable);
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if (r) {
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kfree_skb(skb);
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return RMNET_MAP_COMMAND_UNSUPPORTED;
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} else {
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return RMNET_MAP_COMMAND_ACK;
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}
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}
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static void rmnet_map_send_ack(struct sk_buff *skb,
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unsigned char type,
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struct rmnet_port *port)
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{
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struct rmnet_map_header *map_header = (void *)skb->data;
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struct rmnet_map_control_command *cmd;
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struct net_device *dev = skb->dev;
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if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4)
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skb_trim(skb,
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skb->len - sizeof(struct rmnet_map_dl_csum_trailer));
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skb->protocol = htons(ETH_P_MAP);
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/* Command data immediately follows the MAP header */
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cmd = (struct rmnet_map_control_command *)(map_header + 1);
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cmd->cmd_type = type & 0x03;
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netif_tx_lock(dev);
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dev->netdev_ops->ndo_start_xmit(skb, dev);
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netif_tx_unlock(dev);
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}
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/* Process MAP command frame and send N/ACK message as appropriate. Message cmd
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* name is decoded here and appropriate handler is called.
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*/
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void rmnet_map_command(struct sk_buff *skb, struct rmnet_port *port)
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{
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struct rmnet_map_header *map_header = (void *)skb->data;
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struct rmnet_map_control_command *cmd;
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unsigned char command_name;
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unsigned char rc = 0;
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/* Command data immediately follows the MAP header */
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cmd = (struct rmnet_map_control_command *)(map_header + 1);
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command_name = cmd->command_name;
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switch (command_name) {
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case RMNET_MAP_COMMAND_FLOW_ENABLE:
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rc = rmnet_map_do_flow_control(skb, port, 1);
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break;
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case RMNET_MAP_COMMAND_FLOW_DISABLE:
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rc = rmnet_map_do_flow_control(skb, port, 0);
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break;
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default:
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rc = RMNET_MAP_COMMAND_UNSUPPORTED;
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kfree_skb(skb);
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break;
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}
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if (rc == RMNET_MAP_COMMAND_ACK)
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rmnet_map_send_ack(skb, rc, port);
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}
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