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1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
3 */
4
5#include <linux/netdevice.h>
6#include "rmnet_config.h"
7#include "rmnet_map.h"
8#include "rmnet_private.h"
9#include "rmnet_vnd.h"
10
11static u8 rmnet_map_do_flow_control(struct sk_buff *skb,
12 struct rmnet_port *port,
13 int enable)
14{
15 struct rmnet_map_header *map_header = (void *)skb->data;
16 struct rmnet_endpoint *ep;
17 struct net_device *vnd;
18 u8 mux_id;
19 int r;
20
21 mux_id = map_header->mux_id;
22
23 if (mux_id >= RMNET_MAX_LOGICAL_EP) {
24 kfree_skb(skb);
25 return RX_HANDLER_CONSUMED;
26 }
27
28 ep = rmnet_get_endpoint(port, mux_id);
29 if (!ep) {
30 kfree_skb(skb);
31 return RX_HANDLER_CONSUMED;
32 }
33
34 vnd = ep->egress_dev;
35
36 /* Ignore the ip family and pass the sequence number for both v4 and v6
37 * sequence. User space does not support creating dedicated flows for
38 * the 2 protocols
39 */
40 r = rmnet_vnd_do_flow_control(vnd, enable);
41 if (r) {
42 kfree_skb(skb);
43 return RMNET_MAP_COMMAND_UNSUPPORTED;
44 } else {
45 return RMNET_MAP_COMMAND_ACK;
46 }
47}
48
49static void rmnet_map_send_ack(struct sk_buff *skb,
50 unsigned char type,
51 struct rmnet_port *port)
52{
53 struct rmnet_map_header *map_header = (void *)skb->data;
54 struct rmnet_map_control_command *cmd;
55 struct net_device *dev = skb->dev;
56
57 if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4)
58 skb_trim(skb,
59 skb->len - sizeof(struct rmnet_map_dl_csum_trailer));
60
61 skb->protocol = htons(ETH_P_MAP);
62
63 /* Command data immediately follows the MAP header */
64 cmd = (struct rmnet_map_control_command *)(map_header + 1);
65 cmd->cmd_type = type & 0x03;
66
67 netif_tx_lock(dev);
68 dev->netdev_ops->ndo_start_xmit(skb, dev);
69 netif_tx_unlock(dev);
70}
71
72/* Process MAP command frame and send N/ACK message as appropriate. Message cmd
73 * name is decoded here and appropriate handler is called.
74 */
75void rmnet_map_command(struct sk_buff *skb, struct rmnet_port *port)
76{
77 struct rmnet_map_header *map_header = (void *)skb->data;
78 struct rmnet_map_control_command *cmd;
79 unsigned char command_name;
80 unsigned char rc = 0;
81
82 /* Command data immediately follows the MAP header */
83 cmd = (struct rmnet_map_control_command *)(map_header + 1);
84 command_name = cmd->command_name;
85
86 switch (command_name) {
87 case RMNET_MAP_COMMAND_FLOW_ENABLE:
88 rc = rmnet_map_do_flow_control(skb, port, 1);
89 break;
90
91 case RMNET_MAP_COMMAND_FLOW_DISABLE:
92 rc = rmnet_map_do_flow_control(skb, port, 0);
93 break;
94
95 default:
96 rc = RMNET_MAP_COMMAND_UNSUPPORTED;
97 kfree_skb(skb);
98 break;
99 }
100 if (rc == RMNET_MAP_COMMAND_ACK)
101 rmnet_map_send_ack(skb, rc, port);
102}
1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
3 */
4
5#include <linux/netdevice.h>
6#include "rmnet_config.h"
7#include "rmnet_map.h"
8#include "rmnet_private.h"
9#include "rmnet_vnd.h"
10
11static u8 rmnet_map_do_flow_control(struct sk_buff *skb,
12 struct rmnet_port *port,
13 int enable)
14{
15 struct rmnet_map_header *map_header = (void *)skb->data;
16 struct rmnet_endpoint *ep;
17 struct net_device *vnd;
18 u8 mux_id;
19 int r;
20
21 mux_id = map_header->mux_id;
22
23 if (mux_id >= RMNET_MAX_LOGICAL_EP) {
24 kfree_skb(skb);
25 return RX_HANDLER_CONSUMED;
26 }
27
28 ep = rmnet_get_endpoint(port, mux_id);
29 if (!ep) {
30 kfree_skb(skb);
31 return RX_HANDLER_CONSUMED;
32 }
33
34 vnd = ep->egress_dev;
35
36 /* Ignore the ip family and pass the sequence number for both v4 and v6
37 * sequence. User space does not support creating dedicated flows for
38 * the 2 protocols
39 */
40 r = rmnet_vnd_do_flow_control(vnd, enable);
41 if (r) {
42 kfree_skb(skb);
43 return RMNET_MAP_COMMAND_UNSUPPORTED;
44 } else {
45 return RMNET_MAP_COMMAND_ACK;
46 }
47}
48
49static void rmnet_map_send_ack(struct sk_buff *skb,
50 unsigned char type,
51 struct rmnet_port *port)
52{
53 struct rmnet_map_header *map_header = (void *)skb->data;
54 struct rmnet_map_control_command *cmd;
55 struct net_device *dev = skb->dev;
56
57 if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4)
58 skb_trim(skb,
59 skb->len - sizeof(struct rmnet_map_dl_csum_trailer));
60
61 skb->protocol = htons(ETH_P_MAP);
62
63 /* Command data immediately follows the MAP header */
64 cmd = (struct rmnet_map_control_command *)(map_header + 1);
65 cmd->cmd_type = type & 0x03;
66
67 netif_tx_lock(dev);
68 dev->netdev_ops->ndo_start_xmit(skb, dev);
69 netif_tx_unlock(dev);
70}
71
72/* Process MAP command frame and send N/ACK message as appropriate. Message cmd
73 * name is decoded here and appropriate handler is called.
74 */
75void rmnet_map_command(struct sk_buff *skb, struct rmnet_port *port)
76{
77 struct rmnet_map_header *map_header = (void *)skb->data;
78 struct rmnet_map_control_command *cmd;
79 unsigned char command_name;
80 unsigned char rc = 0;
81
82 /* Command data immediately follows the MAP header */
83 cmd = (struct rmnet_map_control_command *)(map_header + 1);
84 command_name = cmd->command_name;
85
86 switch (command_name) {
87 case RMNET_MAP_COMMAND_FLOW_ENABLE:
88 rc = rmnet_map_do_flow_control(skb, port, 1);
89 break;
90
91 case RMNET_MAP_COMMAND_FLOW_DISABLE:
92 rc = rmnet_map_do_flow_control(skb, port, 0);
93 break;
94
95 default:
96 rc = RMNET_MAP_COMMAND_UNSUPPORTED;
97 kfree_skb(skb);
98 break;
99 }
100 if (rc == RMNET_MAP_COMMAND_ACK)
101 rmnet_map_send_ack(skb, rc, port);
102}