[net-next-2.6.git] / net / caif / chnl_net.c

/*
 * 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;

	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;
	skb->protocol = htons(ETH_P_IP);

	/* 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 (priv->state != CAIF_CONNECTING) {
		priv->state = CAIF_CONNECTING;
		result = caif_connect_client(&priv->conn_req, &priv->chnl,
					&llifindex, &headroom, &tailroom);
		if (result != 0) {
				pr_debug("err: "
					 "Unable to register and open device,"
					 " Err:%d\n",
					 result);
				goto error;
		}

		lldev = dev_get_by_index(dev_net(dev), llifindex);

		if (lldev == NULL) {
			pr_debug("no interface?\n");
			result = -ENODEV;
			goto error;
		}

		dev->needed_tailroom = tailroom + lldev->needed_tailroom;
		dev->hard_header_len = headroom + lldev->hard_header_len +
			lldev->needed_tailroom;

		/*
		 * MTU, head-room etc is not know before we have a
		 * CAIF link layer device available. MTU calculation may
		 * override initial RTNL configuration.
		 * MTU is minimum of current mtu, link layer mtu pluss
		 * CAIF head and tail, and PDP GPRS contexts max MTU.
		 */
		mtu = min_t(int, dev->mtu, lldev->mtu - (headroom + tailroom));
		mtu = min_t(int, GPRS_PDP_MTU, mtu);
		dev_set_mtu(dev, mtu);
		dev_put(lldev);

		if (mtu < 100) {
			pr_warn("CAIF Interface MTU too small (%d)\n", mtu);
			result = -ENODEV;
			goto error;
		}
	}

	rtnl_unlock();  /* Release RTNL lock during connect wait */

	result = wait_event_interruptible_timeout(priv->netmgmt_wq,
						priv->state != CAIF_CONNECTING,
						CONNECT_TIMEOUT);

	rtnl_lock();

	if (result == -ERESTARTSYS) {
		pr_debug("wait_event_interruptible woken by a signal\n");
		result = -ERESTARTSYS;
		goto error;
	}

	if (result == 0) {
		pr_debug("connect timeout\n");
		caif_disconnect_client(&priv->chnl);
		priv->state = CAIF_DISCONNECTED;
		pr_debug("state disconnected\n");
		result = -ETIMEDOUT;
		goto error;
	}

	if (priv->state != CAIF_CONNECTED) {
		pr_debug("connect failed\n");
		result = -ECONNREFUSED;
		goto error;
	}
	pr_debug("CAIF Netdevice connected\n");
	return 0;

error:
	caif_disconnect_client(&priv->chnl);
	priv->state = CAIF_DISCONNECTED;
	pr_debug("state disconnected\n");
	return result;

}

static int chnl_net_stop(struct net_device *dev)
{
	struct chnl_net *priv;

	ASSERT_RTNL();
	priv = netdev_priv(dev);
	priv->state = CAIF_DISCONNECTED;
	caif_disconnect_client(&priv->chnl);
	return 0;
}

static int chnl_net_init(struct net_device *dev)
{
	struct chnl_net *priv;
	ASSERT_RTNL();
	priv = netdev_priv(dev);
	strncpy(priv->name, dev->name, sizeof(priv->name));
	return 0;
}

static void chnl_net_uninit(struct net_device *dev)
{
	struct chnl_net *priv;
	ASSERT_RTNL();
	priv = netdev_priv(dev);
	robust_list_del(&priv->list_field);
}

static const struct net_device_ops netdev_ops = {
	.ndo_open = chnl_net_open,
	.ndo_stop = chnl_net_stop,
	.ndo_init = chnl_net_init,
	.ndo_uninit = chnl_net_uninit,
	.ndo_start_xmit = chnl_net_start_xmit,
};

static void ipcaif_net_setup(struct net_device *dev)
{
	struct chnl_net *priv;
	dev->netdev_ops = &netdev_ops;
	dev->destructor = free_netdev;
	dev->flags |= IFF_NOARP;
	dev->flags |= IFF_POINTOPOINT;
	dev->mtu = GPRS_PDP_MTU;
	dev->tx_queue_len = CAIF_NET_DEFAULT_QUEUE_LEN;

	priv = netdev_priv(dev);
	priv->chnl.receive = chnl_recv_cb;
	priv->chnl.ctrlcmd = chnl_flowctrl_cb;
	priv->netdev = dev;
	priv->conn_req.protocol = CAIFPROTO_DATAGRAM;
	priv->conn_req.link_selector = CAIF_LINK_HIGH_BANDW;
	priv->conn_req.priority = CAIF_PRIO_LOW;
	/* Insert illegal value */
	priv->conn_req.sockaddr.u.dgm.connection_id = -1;
	priv->flowenabled = false;

	ASSERT_RTNL();
	init_waitqueue_head(&priv->netmgmt_wq);
	list_add(&priv->list_field, &chnl_net_list);
}


static int ipcaif_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
	struct chnl_net *priv;
	u8 loop;
	priv = netdev_priv(dev);
	NLA_PUT_U32(skb, IFLA_CAIF_IPV4_CONNID,
		    priv->conn_req.sockaddr.u.dgm.connection_id);
	NLA_PUT_U32(skb, IFLA_CAIF_IPV6_CONNID,
		    priv->conn_req.sockaddr.u.dgm.connection_id);
	loop = priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP;
	NLA_PUT_U8(skb, IFLA_CAIF_LOOPBACK, loop);


	return 0;
nla_put_failure:
	return -EMSGSIZE;

}

static void caif_netlink_parms(struct nlattr *data[],
				struct caif_connect_request *conn_req)
{
	if (!data) {
		pr_warn("no params data found\n");
		return;
	}
	if (data[IFLA_CAIF_IPV4_CONNID])
		conn_req->sockaddr.u.dgm.connection_id =
			nla_get_u32(data[IFLA_CAIF_IPV4_CONNID]);
	if (data[IFLA_CAIF_IPV6_CONNID])
		conn_req->sockaddr.u.dgm.connection_id =
			nla_get_u32(data[IFLA_CAIF_IPV6_CONNID]);
	if (data[IFLA_CAIF_LOOPBACK]) {
		if (nla_get_u8(data[IFLA_CAIF_LOOPBACK]))
			conn_req->protocol = CAIFPROTO_DATAGRAM_LOOP;
		else
			conn_req->protocol = CAIFPROTO_DATAGRAM;
	}
}

static int ipcaif_newlink(struct net *src_net, struct net_device *dev,
			  struct nlattr *tb[], struct nlattr *data[])
{
	int ret;
	struct chnl_net *caifdev;
	ASSERT_RTNL();
	caifdev = netdev_priv(dev);
	caif_netlink_parms(data, &caifdev->conn_req);
	dev_net_set(caifdev->netdev, src_net);

	ret = register_netdevice(dev);
	if (ret)
		pr_warn("device rtml registration failed\n");
	return ret;
}

static int ipcaif_changelink(struct net_device *dev, struct nlattr *tb[],
				struct nlattr *data[])
{
	struct chnl_net *caifdev;
	ASSERT_RTNL();
	caifdev = netdev_priv(dev);
	caif_netlink_parms(data, &caifdev->conn_req);
	netdev_state_change(dev);
	return 0;
}

static size_t ipcaif_get_size(const struct net_device *dev)
{
	return
		/* IFLA_CAIF_IPV4_CONNID */
		nla_total_size(4) +
		/* IFLA_CAIF_IPV6_CONNID */
		nla_total_size(4) +
		/* IFLA_CAIF_LOOPBACK */
		nla_total_size(2) +
		0;
}

static const struct nla_policy ipcaif_policy[IFLA_CAIF_MAX + 1] = {
	[IFLA_CAIF_IPV4_CONNID]	      = { .type = NLA_U32 },
	[IFLA_CAIF_IPV6_CONNID]	      = { .type = NLA_U32 },
	[IFLA_CAIF_LOOPBACK]	      = { .type = NLA_U8 }
};


static struct rtnl_link_ops ipcaif_link_ops __read_mostly = {
	.kind		= "caif",
	.priv_size	= sizeof(struct chnl_net),
	.setup		= ipcaif_net_setup,
	.maxtype	= IFLA_CAIF_MAX,
	.policy		= ipcaif_policy,
	.newlink	= ipcaif_newlink,
	.changelink	= ipcaif_changelink,
	.get_size	= ipcaif_get_size,
	.fill_info	= ipcaif_fill_info,

};

static int __init chnl_init_module(void)
{
	return rtnl_link_register(&ipcaif_link_ops);
}

static void __exit chnl_exit_module(void)
{
	struct chnl_net *dev = NULL;
	struct list_head *list_node;
	struct list_head *_tmp;
	rtnl_link_unregister(&ipcaif_link_ops);
	rtnl_lock();
	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
		dev = list_entry(list_node, struct chnl_net, list_field);
		list_del(list_node);
		delete_device(dev);
	}
	rtnl_unlock();
}

module_init(chnl_init_module);
module_exit(chnl_exit_module);
Commit	Line	Data
cc36a070 SB	1	/*
	2	* Copyright (C) ST-Ericsson AB 2010
	3	* Authors: Sjur Brendeland/sjur.brandeland@stericsson.com
	4	* Daniel Martensson / Daniel.Martensson@stericsson.com
	5	* License terms: GNU General Public License (GPL) version 2
	6	*/
	7
b31fa5ba JP	8	#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
b31fa5ba JP	9
cc36a070 SB	10	#include <linux/version.h>
	11	#include <linux/fs.h>
	12	#include <linux/init.h>
	13	#include <linux/module.h>
	14	#include <linux/netdevice.h>
	15	#include <linux/if_ether.h>
	16	#include <linux/moduleparam.h>
	17	#include <linux/ip.h>
	18	#include <linux/sched.h>
	19	#include <linux/sockios.h>
	20	#include <linux/caif/if_caif.h>
	21	#include <net/rtnetlink.h>
	22	#include <net/caif/caif_layer.h>
	23	#include <net/caif/cfcnfg.h>
	24	#include <net/caif/cfpkt.h>
	25	#include <net/caif/caif_dev.h>
	26
8391c4aa	27	/* GPRS PDP connection has MTU to 1500 */
2aa40aef	28	#define GPRS_PDP_MTU 1500
8391c4aa SB	29	/* 5 sec. connect timeout */
8391c4aa SB	30	#define CONNECT_TIMEOUT (5 * HZ)
cc36a070 SB	31	#define CAIF_NET_DEFAULT_QUEUE_LEN 500
cc36a070 SB	32
cc36a070 SB	33	/This list is protected by the rtnl lock. /
	34	static LIST_HEAD(chnl_net_list);
	35
	36	MODULE_LICENSE("GPL");
	37	MODULE_ALIAS_RTNL_LINK("caif");
	38
8391c4aa SB	39	enum caif_states {
	40	CAIF_CONNECTED = 1,
	41	CAIF_CONNECTING,
	42	CAIF_DISCONNECTED,
	43	CAIF_SHUTDOWN
	44	};
	45
cc36a070 SB	46	struct chnl_net {
	47	struct cflayer chnl;
	48	struct net_device_stats stats;
	49	struct caif_connect_request conn_req;
	50	struct list_head list_field;
	51	struct net_device *netdev;
	52	char name[256];
	53	wait_queue_head_t netmgmt_wq;
	54	/* Flow status to remember and control the transmission. */
	55	bool flowenabled;
8391c4aa	56	enum caif_states state;
cc36a070 SB	57	};
	58
	59	static void robust_list_del(struct list_head *delete_node)
	60	{
	61	struct list_head *list_node;
	62	struct list_head *n;
	63	ASSERT_RTNL();
	64	list_for_each_safe(list_node, n, &chnl_net_list) {
	65	if (list_node == delete_node) {
	66	list_del(list_node);
8391c4aa	67	return;
cc36a070 SB	68	}
cc36a070 SB	69	}
8391c4aa	70	WARN_ON(1);
cc36a070 SB	71	}
	72
	73	static int chnl_recv_cb(struct cflayer layr, struct cfpkt pkt)
	74	{
	75	struct sk_buff *skb;
8391c4aa	76	struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
cc36a070 SB	77	int pktlen;
	78	int err = 0;
	79
	80	priv = container_of(layr, struct chnl_net, chnl);
	81
	82	if (!priv)
	83	return -EINVAL;
	84
	85	/* Get length of CAIF packet. */
	86	pktlen = cfpkt_getlen(pkt);
	87
	88	skb = (struct sk_buff *) cfpkt_tonative(pkt);
	89	/* Pass some minimum information and
	90	* send the packet to the net stack.
	91	*/
	92	skb->dev = priv->netdev;
	93	skb->protocol = htons(ETH_P_IP);
	94
	95	/* If we change the header in loop mode, the checksum is corrupted. */
	96	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
	97	skb->ip_summed = CHECKSUM_UNNECESSARY;
	98	else
	99	skb->ip_summed = CHECKSUM_NONE;
	100
cc36a070 SB	101	if (in_interrupt())
	102	netif_rx(skb);
	103	else
	104	netif_rx_ni(skb);
	105
	106	/* Update statistics. */
	107	priv->netdev->stats.rx_packets++;
	108	priv->netdev->stats.rx_bytes += pktlen;
	109
	110	return err;
	111	}
	112
	113	static int delete_device(struct chnl_net *dev)
	114	{
	115	ASSERT_RTNL();
	116	if (dev->netdev)
	117	unregister_netdevice(dev->netdev);
	118	return 0;
	119	}
	120
	121	static void close_work(struct work_struct *work)
	122	{
	123	struct chnl_net *dev = NULL;
	124	struct list_head *list_node;
	125	struct list_head *_tmp;
8391c4aa SB	126	/* May be called with or without RTNL lock held */
	127	int islocked = rtnl_is_locked();
	128	if (!islocked)
	129	rtnl_lock();
cc36a070 SB	130	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
cc36a070 SB	131	dev = list_entry(list_node, struct chnl_net, list_field);
8391c4aa SB	132	if (dev->state == CAIF_SHUTDOWN)
8391c4aa SB	133	dev_close(dev->netdev);
cc36a070	134	}
8391c4aa SB	135	if (!islocked)
8391c4aa SB	136	rtnl_unlock();
cc36a070 SB	137	}
	138	static DECLARE_WORK(close_worker, close_work);
	139
	140	static void chnl_flowctrl_cb(struct cflayer *layr, enum caif_ctrlcmd flow,
	141	int phyid)
	142	{
8391c4aa	143	struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
b31fa5ba	144	pr_debug("NET flowctrl func called flow: %s\n",
cc36a070 SB	145	flow == CAIF_CTRLCMD_FLOW_ON_IND ? "ON" :
	146	flow == CAIF_CTRLCMD_INIT_RSP ? "INIT" :
	147	flow == CAIF_CTRLCMD_FLOW_OFF_IND ? "OFF" :
	148	flow == CAIF_CTRLCMD_DEINIT_RSP ? "CLOSE/DEINIT" :
	149	flow == CAIF_CTRLCMD_INIT_FAIL_RSP ? "OPEN_FAIL" :
	150	flow == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND ?
	151	"REMOTE_SHUTDOWN" : "UKNOWN CTRL COMMAND");
	152
8391c4aa	153
cc36a070 SB	154
	155	switch (flow) {
	156	case CAIF_CTRLCMD_FLOW_OFF_IND:
8391c4aa SB	157	priv->flowenabled = false;
	158	netif_stop_queue(priv->netdev);
	159	break;
cc36a070	160	case CAIF_CTRLCMD_DEINIT_RSP:
8391c4aa SB	161	priv->state = CAIF_DISCONNECTED;
8391c4aa SB	162	break;
cc36a070	163	case CAIF_CTRLCMD_INIT_FAIL_RSP:
8391c4aa SB	164	priv->state = CAIF_DISCONNECTED;
	165	wake_up_interruptible(&priv->netmgmt_wq);
	166	break;
cc36a070	167	case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
8391c4aa	168	priv->state = CAIF_SHUTDOWN;
cc36a070	169	netif_tx_disable(priv->netdev);
cc36a070 SB	170	schedule_work(&close_worker);
	171	break;
	172	case CAIF_CTRLCMD_FLOW_ON_IND:
8391c4aa SB	173	priv->flowenabled = true;
	174	netif_wake_queue(priv->netdev);
	175	break;
cc36a070	176	case CAIF_CTRLCMD_INIT_RSP:
8391c4aa	177	priv->state = CAIF_CONNECTED;
cc36a070 SB	178	priv->flowenabled = true;
	179	netif_wake_queue(priv->netdev);
	180	wake_up_interruptible(&priv->netmgmt_wq);
	181	break;
	182	default:
	183	break;
	184	}
	185	}
	186
	187	static int chnl_net_start_xmit(struct sk_buff skb, struct net_device dev)
	188	{
	189	struct chnl_net *priv;
	190	struct cfpkt *pkt = NULL;
	191	int len;
	192	int result = -1;
	193	/* Get our private data. */
	194	priv = netdev_priv(dev);
	195
	196	if (skb->len > priv->netdev->mtu) {
b31fa5ba	197	pr_warn("Size of skb exceeded MTU\n");
cc36a070 SB	198	return -ENOSPC;
	199	}
	200
	201	if (!priv->flowenabled) {
b31fa5ba	202	pr_debug("dropping packets flow off\n");
cc36a070 SB	203	return NETDEV_TX_BUSY;
	204	}
	205
	206	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
	207	swap(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
	208
	209	/* Store original SKB length. */
	210	len = skb->len;
	211
	212	pkt = cfpkt_fromnative(CAIF_DIR_OUT, (void *) skb);
	213
cc36a070 SB	214	/* Send the packet down the stack. */
	215	result = priv->chnl.dn->transmit(priv->chnl.dn, pkt);
	216	if (result) {
	217	if (result == -EAGAIN)
	218	result = NETDEV_TX_BUSY;
	219	return result;
	220	}
	221
	222	/* Update statistics. */
	223	dev->stats.tx_packets++;
	224	dev->stats.tx_bytes += len;
	225
	226	return NETDEV_TX_OK;
	227	}
	228
	229	static int chnl_net_open(struct net_device *dev)
	230	{
	231	struct chnl_net *priv = NULL;
	232	int result = -1;
2aa40aef SB	233	int llifindex, headroom, tailroom, mtu;
2aa40aef SB	234	struct net_device *lldev;
cc36a070	235	ASSERT_RTNL();
cc36a070	236	priv = netdev_priv(dev);
cc36a070	237	if (!priv) {
b31fa5ba	238	pr_debug("chnl_net_open: no priv\n");
cc36a070 SB	239	return -ENODEV;
cc36a070 SB	240	}
8391c4aa SB	241
	242	if (priv->state != CAIF_CONNECTING) {
	243	priv->state = CAIF_CONNECTING;
2aa40aef SB	244	result = caif_connect_client(&priv->conn_req, &priv->chnl,
2aa40aef SB	245	&llifindex, &headroom, &tailroom);
8391c4aa	246	if (result != 0) {
b31fa5ba JP	247	pr_debug("err: "
	248	"Unable to register and open device,"
	249	" Err:%d\n",
	250	result);
2aa40aef SB	251	goto error;
	252	}
	253
	254	lldev = dev_get_by_index(dev_net(dev), llifindex);
	255
	256	if (lldev == NULL) {
b31fa5ba	257	pr_debug("no interface?\n");
2aa40aef SB	258	result = -ENODEV;
	259	goto error;
	260	}
	261
	262	dev->needed_tailroom = tailroom + lldev->needed_tailroom;
	263	dev->hard_header_len = headroom + lldev->hard_header_len +
	264	lldev->needed_tailroom;
	265
	266	/*
	267	* MTU, head-room etc is not know before we have a
	268	* CAIF link layer device available. MTU calculation may
	269	* override initial RTNL configuration.
	270	* MTU is minimum of current mtu, link layer mtu pluss
	271	* CAIF head and tail, and PDP GPRS contexts max MTU.
	272	*/
	273	mtu = min_t(int, dev->mtu, lldev->mtu - (headroom + tailroom));
	274	mtu = min_t(int, GPRS_PDP_MTU, mtu);
	275	dev_set_mtu(dev, mtu);
	276	dev_put(lldev);
	277
	278	if (mtu < 100) {
b31fa5ba	279	pr_warn("CAIF Interface MTU too small (%d)\n", mtu);
2aa40aef SB	280	result = -ENODEV;
2aa40aef SB	281	goto error;
8391c4aa	282	}
cc36a070	283	}
8391c4aa	284
2aa40aef SB	285	rtnl_unlock(); /* Release RTNL lock during connect wait */
2aa40aef SB	286
8391c4aa SB	287	result = wait_event_interruptible_timeout(priv->netmgmt_wq,
	288	priv->state != CAIF_CONNECTING,
	289	CONNECT_TIMEOUT);
cc36a070	290
2aa40aef SB	291	rtnl_lock();
2aa40aef SB	292
cc36a070	293	if (result == -ERESTARTSYS) {
b31fa5ba	294	pr_debug("wait_event_interruptible woken by a signal\n");
2aa40aef SB	295	result = -ERESTARTSYS;
2aa40aef SB	296	goto error;
8391c4aa	297	}
2aa40aef	298
8391c4aa	299	if (result == 0) {
b31fa5ba	300	pr_debug("connect timeout\n");
8391c4aa SB	301	caif_disconnect_client(&priv->chnl);
8391c4aa SB	302	priv->state = CAIF_DISCONNECTED;
b31fa5ba	303	pr_debug("state disconnected\n");
2aa40aef SB	304	result = -ETIMEDOUT;
2aa40aef SB	305	goto error;
8391c4aa	306	}
cc36a070	307
8391c4aa	308	if (priv->state != CAIF_CONNECTED) {
b31fa5ba	309	pr_debug("connect failed\n");
2aa40aef SB	310	result = -ECONNREFUSED;
2aa40aef SB	311	goto error;
8391c4aa	312	}
b31fa5ba	313	pr_debug("CAIF Netdevice connected\n");
cc36a070	314	return 0;
2aa40aef SB	315
	316	error:
	317	caif_disconnect_client(&priv->chnl);
	318	priv->state = CAIF_DISCONNECTED;
b31fa5ba	319	pr_debug("state disconnected\n");
2aa40aef SB	320	return result;
2aa40aef SB	321
cc36a070 SB	322	}
	323
	324	static int chnl_net_stop(struct net_device *dev)
	325	{
	326	struct chnl_net *priv;
8391c4aa	327
cc36a070 SB	328	ASSERT_RTNL();
cc36a070 SB	329	priv = netdev_priv(dev);
8391c4aa SB	330	priv->state = CAIF_DISCONNECTED;
8391c4aa SB	331	caif_disconnect_client(&priv->chnl);
cc36a070 SB	332	return 0;
	333	}
	334
	335	static int chnl_net_init(struct net_device *dev)
	336	{
	337	struct chnl_net *priv;
	338	ASSERT_RTNL();
	339	priv = netdev_priv(dev);
	340	strncpy(priv->name, dev->name, sizeof(priv->name));
	341	return 0;
	342	}
	343
	344	static void chnl_net_uninit(struct net_device *dev)
	345	{
	346	struct chnl_net *priv;
	347	ASSERT_RTNL();
	348	priv = netdev_priv(dev);
	349	robust_list_del(&priv->list_field);
	350	}
	351
	352	static const struct net_device_ops netdev_ops = {
	353	.ndo_open = chnl_net_open,
	354	.ndo_stop = chnl_net_stop,
	355	.ndo_init = chnl_net_init,
	356	.ndo_uninit = chnl_net_uninit,
	357	.ndo_start_xmit = chnl_net_start_xmit,
	358	};
	359
	360	static void ipcaif_net_setup(struct net_device *dev)
	361	{
	362	struct chnl_net *priv;
	363	dev->netdev_ops = &netdev_ops;
	364	dev->destructor = free_netdev;
	365	dev->flags \|= IFF_NOARP;
	366	dev->flags \|= IFF_POINTOPOINT;
2aa40aef	367	dev->mtu = GPRS_PDP_MTU;
cc36a070 SB	368	dev->tx_queue_len = CAIF_NET_DEFAULT_QUEUE_LEN;
	369
	370	priv = netdev_priv(dev);
	371	priv->chnl.receive = chnl_recv_cb;
	372	priv->chnl.ctrlcmd = chnl_flowctrl_cb;
	373	priv->netdev = dev;
	374	priv->conn_req.protocol = CAIFPROTO_DATAGRAM;
	375	priv->conn_req.link_selector = CAIF_LINK_HIGH_BANDW;
	376	priv->conn_req.priority = CAIF_PRIO_LOW;
	377	/* Insert illegal value */
	378	priv->conn_req.sockaddr.u.dgm.connection_id = -1;
	379	priv->flowenabled = false;
	380
	381	ASSERT_RTNL();
	382	init_waitqueue_head(&priv->netmgmt_wq);
	383	list_add(&priv->list_field, &chnl_net_list);
	384	}
	385
	386
	387	static int ipcaif_fill_info(struct sk_buff skb, const struct net_device dev)
	388	{
	389	struct chnl_net *priv;
	390	u8 loop;
	391	priv = netdev_priv(dev);
	392	NLA_PUT_U32(skb, IFLA_CAIF_IPV4_CONNID,
	393	priv->conn_req.sockaddr.u.dgm.connection_id);
	394	NLA_PUT_U32(skb, IFLA_CAIF_IPV6_CONNID,
	395	priv->conn_req.sockaddr.u.dgm.connection_id);
	396	loop = priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP;
	397	NLA_PUT_U8(skb, IFLA_CAIF_LOOPBACK, loop);
	398
	399
	400	return 0;
	401	nla_put_failure:
	402	return -EMSGSIZE;
	403
	404	}
	405
	406	static void caif_netlink_parms(struct nlattr *data[],
	407	struct caif_connect_request *conn_req)
	408	{
	409	if (!data) {
b31fa5ba	410	pr_warn("no params data found\n");
cc36a070 SB	411	return;
	412	}
	413	if (data[IFLA_CAIF_IPV4_CONNID])
	414	conn_req->sockaddr.u.dgm.connection_id =
	415	nla_get_u32(data[IFLA_CAIF_IPV4_CONNID]);
	416	if (data[IFLA_CAIF_IPV6_CONNID])
	417	conn_req->sockaddr.u.dgm.connection_id =
	418	nla_get_u32(data[IFLA_CAIF_IPV6_CONNID]);
	419	if (data[IFLA_CAIF_LOOPBACK]) {
	420	if (nla_get_u8(data[IFLA_CAIF_LOOPBACK]))
	421	conn_req->protocol = CAIFPROTO_DATAGRAM_LOOP;
	422	else
	423	conn_req->protocol = CAIFPROTO_DATAGRAM;
	424	}
	425	}
	426
	427	static int ipcaif_newlink(struct net src_net, struct net_device dev,
	428	struct nlattr tb[], struct nlattr data[])
	429	{
	430	int ret;
	431	struct chnl_net *caifdev;
	432	ASSERT_RTNL();
	433	caifdev = netdev_priv(dev);
	434	caif_netlink_parms(data, &caifdev->conn_req);
8391c4aa SB	435	dev_net_set(caifdev->netdev, src_net);
8391c4aa SB	436
cc36a070 SB	437	ret = register_netdevice(dev);
cc36a070 SB	438	if (ret)
b31fa5ba	439	pr_warn("device rtml registration failed\n");
cc36a070 SB	440	return ret;
	441	}
	442
	443	static int ipcaif_changelink(struct net_device dev, struct nlattr tb[],
	444	struct nlattr *data[])
	445	{
	446	struct chnl_net *caifdev;
	447	ASSERT_RTNL();
	448	caifdev = netdev_priv(dev);
	449	caif_netlink_parms(data, &caifdev->conn_req);
	450	netdev_state_change(dev);
	451	return 0;
	452	}
	453
	454	static size_t ipcaif_get_size(const struct net_device *dev)
	455	{
	456	return
	457	/* IFLA_CAIF_IPV4_CONNID */
	458	nla_total_size(4) +
	459	/* IFLA_CAIF_IPV6_CONNID */
	460	nla_total_size(4) +
	461	/* IFLA_CAIF_LOOPBACK */
	462	nla_total_size(2) +
	463	0;
	464	}
	465
	466	static const struct nla_policy ipcaif_policy[IFLA_CAIF_MAX + 1] = {
	467	[IFLA_CAIF_IPV4_CONNID] = { .type = NLA_U32 },
	468	[IFLA_CAIF_IPV6_CONNID] = { .type = NLA_U32 },
	469	[IFLA_CAIF_LOOPBACK] = { .type = NLA_U8 }
	470	};
	471
	472
	473	static struct rtnl_link_ops ipcaif_link_ops __read_mostly = {
	474	.kind = "caif",
	475	.priv_size = sizeof(struct chnl_net),
	476	.setup = ipcaif_net_setup,
	477	.maxtype = IFLA_CAIF_MAX,
	478	.policy = ipcaif_policy,
	479	.newlink = ipcaif_newlink,
	480	.changelink = ipcaif_changelink,
	481	.get_size = ipcaif_get_size,
	482	.fill_info = ipcaif_fill_info,
	483
	484	};
	485
	486	static int __init chnl_init_module(void)
	487	{
	488	return rtnl_link_register(&ipcaif_link_ops);
	489	}
	490
	491	static void __exit chnl_exit_module(void)
	492	{
	493	struct chnl_net *dev = NULL;
	494	struct list_head *list_node;
	495	struct list_head *_tmp;
	496	rtnl_link_unregister(&ipcaif_link_ops);
	497	rtnl_lock();
	498	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
	499	dev = list_entry(list_node, struct chnl_net, list_field);
	500	list_del(list_node);
	501	delete_device(dev);
	502	}
	503	rtnl_unlock();
504	}
505
506	module_init(chnl_init_module);
507	module_exit(chnl_exit_module);