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/*
* Copyright (C) ST-Ericsson AB 2010
* Authors: Sjur Brendeland/sjur.brandeland@stericsson.com
* Daniel Martensson / Daniel.Martensson@stericsson.com
* License terms: GNU General Public License (GPL) version 2
*/
#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
#include <linux/version.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/if_ether.h>
#include <linux/moduleparam.h>
#include <linux/ip.h>
#include <linux/sched.h>
#include <linux/sockios.h>
#include <linux/caif/if_caif.h>
#include <net/rtnetlink.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfcnfg.h>
#include <net/caif/cfpkt.h>
#include <net/caif/caif_dev.h>
/* GPRS PDP connection has MTU to 1500 */
#define GPRS_PDP_MTU 1500
/* 5 sec. connect timeout */
#define CONNECT_TIMEOUT (5 * HZ)
#define CAIF_NET_DEFAULT_QUEUE_LEN 500
/*This list is protected by the rtnl lock. */
static LIST_HEAD(chnl_net_list);
MODULE_LICENSE("GPL");
MODULE_ALIAS_RTNL_LINK("caif");
enum caif_states {
CAIF_CONNECTED = 1,
CAIF_CONNECTING,
CAIF_DISCONNECTED,
CAIF_SHUTDOWN
};
struct chnl_net {
struct cflayer chnl;
struct net_device_stats stats;
struct caif_connect_request conn_req;
struct list_head list_field;
struct net_device *netdev;
char name[256];
wait_queue_head_t netmgmt_wq;
/* Flow status to remember and control the transmission. */
bool flowenabled;
enum caif_states state;
};
static void robust_list_del(struct list_head *delete_node)
{
struct list_head *list_node;
struct list_head *n;
ASSERT_RTNL();
list_for_each_safe(list_node, n, &chnl_net_list) {
if (list_node == delete_node) {
list_del(list_node);
return;
}
}
WARN_ON(1);
}
static int chnl_recv_cb(struct cflayer *layr, struct cfpkt *pkt)
{
struct sk_buff *skb;
struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
int pktlen;
int err = 0;
const u8 *ip_version;
u8 buf;
priv = container_of(layr, struct chnl_net, chnl);
if (!priv)
return -EINVAL;
/* Get length of CAIF packet. */
pktlen = cfpkt_getlen(pkt);
skb = (struct sk_buff *) cfpkt_tonative(pkt);
/* Pass some minimum information and
* send the packet to the net stack.
*/
skb->dev = priv->netdev;
/* check the version of IP */
ip_version = skb_header_pointer(skb, 0, 1, &buf);
if (!ip_version)
return -EINVAL;
switch (*ip_version >> 4) {
case 4:
skb->protocol = htons(ETH_P_IP);
break;
case 6:
skb->protocol = htons(ETH_P_IPV6);
break;
default:
return -EINVAL;
}
/* If we change the header in loop mode, the checksum is corrupted. */
if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
skb->ip_summed = CHECKSUM_UNNECESSARY;
else
skb->ip_summed = CHECKSUM_NONE;
if (in_interrupt())
netif_rx(skb);
else
netif_rx_ni(skb);
/* Update statistics. */
priv->netdev->stats.rx_packets++;
priv->netdev->stats.rx_bytes += pktlen;
return err;
}
static int delete_device(struct chnl_net *dev)
{
ASSERT_RTNL();
if (dev->netdev)
unregister_netdevice(dev->netdev);
return 0;
}
static void close_work(struct work_struct *work)
{
struct chnl_net *dev = NULL;
struct list_head *list_node;
struct list_head *_tmp;
/* May be called with or without RTNL lock held */
int islocked = rtnl_is_locked();
if (!islocked)
rtnl_lock();
list_for_each_safe(list_node, _tmp, &chnl_net_list) {
dev = list_entry(list_node, struct chnl_net, list_field);
if (dev->state == CAIF_SHUTDOWN)
dev_close(dev->netdev);
}
if (!islocked)
rtnl_unlock();
}
static DECLARE_WORK(close_worker, close_work);
static void chnl_flowctrl_cb(struct cflayer *layr, enum caif_ctrlcmd flow,
int phyid)
{
struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
pr_debug("NET flowctrl func called flow: %s\n",
flow == CAIF_CTRLCMD_FLOW_ON_IND ? "ON" :
flow == CAIF_CTRLCMD_INIT_RSP ? "INIT" :
flow == CAIF_CTRLCMD_FLOW_OFF_IND ? "OFF" :
flow == CAIF_CTRLCMD_DEINIT_RSP ? "CLOSE/DEINIT" :
flow == CAIF_CTRLCMD_INIT_FAIL_RSP ? "OPEN_FAIL" :
flow == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND ?
"REMOTE_SHUTDOWN" : "UKNOWN CTRL COMMAND");
switch (flow) {
case CAIF_CTRLCMD_FLOW_OFF_IND:
priv->flowenabled = false;
netif_stop_queue(priv->netdev);
break;
case CAIF_CTRLCMD_DEINIT_RSP:
priv->state = CAIF_DISCONNECTED;
break;
case CAIF_CTRLCMD_INIT_FAIL_RSP:
priv->state = CAIF_DISCONNECTED;
wake_up_interruptible(&priv->netmgmt_wq);
break;
case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
priv->state = CAIF_SHUTDOWN;
netif_tx_disable(priv->netdev);
schedule_work(&close_worker);
break;
case CAIF_CTRLCMD_FLOW_ON_IND:
priv->flowenabled = true;
netif_wake_queue(priv->netdev);
break;
case CAIF_CTRLCMD_INIT_RSP:
priv->state = CAIF_CONNECTED;
priv->flowenabled = true;
netif_wake_queue(priv->netdev);
wake_up_interruptible(&priv->netmgmt_wq);
break;
default:
break;
}
}
static int chnl_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct chnl_net *priv;
struct cfpkt *pkt = NULL;
int len;
int result = -1;
/* Get our private data. */
priv = netdev_priv(dev);
if (skb->len > priv->netdev->mtu) {
pr_warn("Size of skb exceeded MTU\n");
return -ENOSPC;
}
if (!priv->flowenabled) {
pr_debug("dropping packets flow off\n");
return NETDEV_TX_BUSY;
}
if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
swap(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
/* Store original SKB length. */
len = skb->len;
pkt = cfpkt_fromnative(CAIF_DIR_OUT, (void *) skb);
/* Send the packet down the stack. */
result = priv->chnl.dn->transmit(priv->chnl.dn, pkt);
if (result) {
if (result == -EAGAIN)
result = NETDEV_TX_BUSY;
return result;
}
/* Update statistics. */
dev->stats.tx_packets++;
dev->stats.tx_bytes += len;
return NETDEV_TX_OK;
}
static int chnl_net_open(struct net_device *dev)
{
struct chnl_net *priv = NULL;
int result = -1;
int llifindex, headroom, tailroom, mtu;
struct net_device *lldev;
ASSERT_RTNL();
priv = netdev_priv(dev);
if (!priv) {
pr_debug("chnl_net_open: no priv\n");
return -ENODEV;
}
if (<
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