276 lines
6.1 KiB
C
276 lines
6.1 KiB
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 0x40
|
||
|
|
#define RMNET_IP_VERSION_6 0x60
|
||
|
|
|
||
|
|
/* Helper Functions */
|
||
|
|
|
||
|
|
static void rmnet_set_skb_proto(struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
switch (skb->data[0] & 0xF0) {
|
||
|
|
case RMNET_IP_VERSION_4:
|
||
|
|
skb->protocol = htons(ETH_P_IP);
|
||
|
|
break;
|
||
|
|
case RMNET_IP_VERSION_6:
|
||
|
|
skb->protocol = htons(ETH_P_IPV6);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
skb->protocol = htons(ETH_P_MAP);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Generic handler */
|
||
|
|
|
||
|
|
static void
|
||
|
|
rmnet_deliver_skb(struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct rmnet_priv *priv = netdev_priv(skb->dev);
|
||
|
|
|
||
|
|
skb_reset_transport_header(skb);
|
||
|
|
skb_reset_network_header(skb);
|
||
|
|
rmnet_vnd_rx_fixup(skb, skb->dev);
|
||
|
|
|
||
|
|
skb->pkt_type = PACKET_HOST;
|
||
|
|
skb_set_mac_header(skb, 0);
|
||
|
|
gro_cells_receive(&priv->gro_cells, skb);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* MAP handler */
|
||
|
|
|
||
|
|
static void
|
||
|
|
__rmnet_map_ingress_handler(struct sk_buff *skb,
|
||
|
|
struct rmnet_port *port)
|
||
|
|
{
|
||
|
|
struct rmnet_map_header *map_header = (void *)skb->data;
|
||
|
|
struct rmnet_endpoint *ep;
|
||
|
|
u16 len, pad;
|
||
|
|
u8 mux_id;
|
||
|
|
|
||
|
|
if (map_header->flags & MAP_CMD_FLAG) {
|
||
|
|
/* Packet contains a MAP command (not data) */
|
||
|
|
if (port->data_format & RMNET_FLAGS_INGRESS_MAP_COMMANDS)
|
||
|
|
return rmnet_map_command(skb, port);
|
||
|
|
|
||
|
|
goto free_skb;
|
||
|
|
}
|
||
|
|
|
||
|
|
mux_id = map_header->mux_id;
|
||
|
|
pad = map_header->flags & MAP_PAD_LEN_MASK;
|
||
|
|
len = ntohs(map_header->pkt_len) - pad;
|
||
|
|
|
||
|
|
if (mux_id >= RMNET_MAX_LOGICAL_EP)
|
||
|
|
goto free_skb;
|
||
|
|
|
||
|
|
ep = rmnet_get_endpoint(port, mux_id);
|
||
|
|
if (!ep)
|
||
|
|
goto free_skb;
|
||
|
|
|
||
|
|
skb->dev = ep->egress_dev;
|
||
|
|
|
||
|
|
if ((port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV5) &&
|
||
|
|
(map_header->flags & MAP_NEXT_HEADER_FLAG)) {
|
||
|
|
if (rmnet_map_process_next_hdr_packet(skb, len))
|
||
|
|
goto free_skb;
|
||
|
|
skb_pull(skb, sizeof(*map_header));
|
||
|
|
rmnet_set_skb_proto(skb);
|
||
|
|
} else {
|
||
|
|
/* Subtract MAP header */
|
||
|
|
skb_pull(skb, sizeof(*map_header));
|
||
|
|
rmnet_set_skb_proto(skb);
|
||
|
|
if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4 &&
|
||
|
|
!rmnet_map_checksum_downlink_packet(skb, len + pad))
|
||
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
||
|
|
}
|
||
|
|
|
||
|
|
skb_trim(skb, len);
|
||
|
|
rmnet_deliver_skb(skb);
|
||
|
|
return;
|
||
|
|
|
||
|
|
free_skb:
|
||
|
|
kfree_skb(skb);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
rmnet_map_ingress_handler(struct sk_buff *skb,
|
||
|
|
struct rmnet_port *port)
|
||
|
|
{
|
||
|
|
struct sk_buff *skbn;
|
||
|
|
|
||
|
|
if (skb->dev->type == ARPHRD_ETHER) {
|
||
|
|
if (pskb_expand_head(skb, ETH_HLEN, 0, GFP_ATOMIC)) {
|
||
|
|
kfree_skb(skb);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
skb_push(skb, ETH_HLEN);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (port->data_format & RMNET_FLAGS_INGRESS_DEAGGREGATION) {
|
||
|
|
while ((skbn = rmnet_map_deaggregate(skb, port)) != NULL)
|
||
|
|
__rmnet_map_ingress_handler(skbn, port);
|
||
|
|
|
||
|
|
consume_skb(skb);
|
||
|
|
} else {
|
||
|
|
__rmnet_map_ingress_handler(skb, port);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int rmnet_map_egress_handler(struct sk_buff *skb,
|
||
|
|
struct rmnet_port *port, u8 mux_id,
|
||
|
|
struct net_device *orig_dev)
|
||
|
|
{
|
||
|
|
int required_headroom, additional_header_len, csum_type = 0;
|
||
|
|
struct rmnet_map_header *map_header;
|
||
|
|
|
||
|
|
additional_header_len = 0;
|
||
|
|
required_headroom = sizeof(struct rmnet_map_header);
|
||
|
|
|
||
|
|
if (port->data_format & RMNET_FLAGS_EGRESS_MAP_CKSUMV4) {
|
||
|
|
additional_header_len = sizeof(struct rmnet_map_ul_csum_header);
|
||
|
|
csum_type = RMNET_FLAGS_EGRESS_MAP_CKSUMV4;
|
||
|
|
} else if (port->data_format & RMNET_FLAGS_EGRESS_MAP_CKSUMV5) {
|
||
|
|
additional_header_len = sizeof(struct rmnet_map_v5_csum_header);
|
||
|
|
csum_type = RMNET_FLAGS_EGRESS_MAP_CKSUMV5;
|
||
|
|
}
|
||
|
|
|
||
|
|
required_headroom += additional_header_len;
|
||
|
|
|
||
|
|
if (skb_cow_head(skb, required_headroom) < 0)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
if (csum_type)
|
||
|
|
rmnet_map_checksum_uplink_packet(skb, port, orig_dev,
|
||
|
|
csum_type);
|
||
|
|
|
||
|
|
map_header = rmnet_map_add_map_header(skb, additional_header_len,
|
||
|
|
port, 0);
|
||
|
|
if (!map_header)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
map_header->mux_id = mux_id;
|
||
|
|
|
||
|
|
if (READ_ONCE(port->egress_agg_params.count) > 1) {
|
||
|
|
unsigned int len;
|
||
|
|
|
||
|
|
len = rmnet_map_tx_aggregate(skb, port, orig_dev);
|
||
|
|
if (likely(len)) {
|
||
|
|
rmnet_vnd_tx_fixup_len(len, orig_dev);
|
||
|
|
return -EINPROGRESS;
|
||
|
|
}
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
skb->protocol = htons(ETH_P_MAP);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
rmnet_bridge_handler(struct sk_buff *skb, struct net_device *bridge_dev)
|
||
|
|
{
|
||
|
|
if (skb_mac_header_was_set(skb))
|
||
|
|
skb_push(skb, skb->mac_len);
|
||
|
|
|
||
|
|
if (bridge_dev) {
|
||
|
|
skb->dev = bridge_dev;
|
||
|
|
dev_queue_xmit(skb);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 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)
|
||
|
|
{
|
||
|
|
struct sk_buff *skb = *pskb;
|
||
|
|
struct rmnet_port *port;
|
||
|
|
struct net_device *dev;
|
||
|
|
|
||
|
|
if (!skb)
|
||
|
|
goto done;
|
||
|
|
|
||
|
|
if (skb_linearize(skb)) {
|
||
|
|
kfree_skb(skb);
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (skb->pkt_type == PACKET_LOOPBACK)
|
||
|
|
return RX_HANDLER_PASS;
|
||
|
|
|
||
|
|
dev = skb->dev;
|
||
|
|
port = rmnet_get_port_rcu(dev);
|
||
|
|
if (unlikely(!port)) {
|
||
|
|
dev_core_stats_rx_nohandler_inc(skb->dev);
|
||
|
|
kfree_skb(skb);
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (port->rmnet_mode) {
|
||
|
|
case RMNET_EPMODE_VND:
|
||
|
|
rmnet_map_ingress_handler(skb, port);
|
||
|
|
break;
|
||
|
|
case RMNET_EPMODE_BRIDGE:
|
||
|
|
rmnet_bridge_handler(skb, port->bridge_ep);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
done:
|
||
|
|
return RX_HANDLER_CONSUMED;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 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)
|
||
|
|
{
|
||
|
|
struct net_device *orig_dev;
|
||
|
|
struct rmnet_port *port;
|
||
|
|
struct rmnet_priv *priv;
|
||
|
|
u8 mux_id;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
sk_pacing_shift_update(skb->sk, 8);
|
||
|
|
|
||
|
|
orig_dev = skb->dev;
|
||
|
|
priv = netdev_priv(orig_dev);
|
||
|
|
skb->dev = priv->real_dev;
|
||
|
|
mux_id = priv->mux_id;
|
||
|
|
|
||
|
|
port = rmnet_get_port_rcu(skb->dev);
|
||
|
|
if (!port)
|
||
|
|
goto drop;
|
||
|
|
|
||
|
|
err = rmnet_map_egress_handler(skb, port, mux_id, orig_dev);
|
||
|
|
if (err == -ENOMEM)
|
||
|
|
goto drop;
|
||
|
|
else if (err == -EINPROGRESS)
|
||
|
|
return;
|
||
|
|
|
||
|
|
rmnet_vnd_tx_fixup(skb, orig_dev);
|
||
|
|
|
||
|
|
dev_queue_xmit(skb);
|
||
|
|
return;
|
||
|
|
|
||
|
|
drop:
|
||
|
|
this_cpu_inc(priv->pcpu_stats->stats.tx_drops);
|
||
|
|
kfree_skb(skb);
|
||
|
|
}
|