[linux-2.6-block.git] / net / caif / chnl_net.c

/*
 * Copyright (C) ST-Ericsson AB 2010
 * Authors:	Sjur Brendeland
 *		Daniel Martensson
 * License terms: GNU General Public License (GPL) version 2
 */

#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__

#include <linux/fs.h>
#include <linux/hardirq.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/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
#define UNDEF_CONNID 0xffffffff

/*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;
	int pktlen;
	const u8 *ip_version;
	u8 buf;

	priv = container_of(layr, struct chnl_net, chnl);
	if (!priv)
		return -EINVAL;

	skb = (struct sk_buff *) cfpkt_tonative(pkt);

	/* Get length of CAIF packet. */
	pktlen = skb->len;

	/* 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) {
		kfree_skb(skb);
		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:
		kfree_skb(skb);
		priv->netdev->stats.rx_errors++;
		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 0;
}

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;

	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);
	}
	rtnl_unlock();
}
static DECLARE_WORK(close_worker, close_work);

static void chnl_hold(struct cflayer *lyr)
{
	struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
	dev_hold(priv->netdev);
}

static void chnl_put(struct cflayer *lyr)
{
	struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
	dev_put(priv->netdev);
}

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:
		caif_client_register_refcnt(&priv->chnl, chnl_hold, chnl_put);
		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");
		kfree_skb(skb);
		dev->stats.tx_errors++;
		return NETDEV_TX_OK;
	}

	if (!priv->flowenabled) {
		pr_debug("dropping packets flow off\n");
		kfree_skb(skb);
		dev->stats.tx_dropped++;
		return NETDEV_TX_OK;
	}

	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) {
		dev->stats.tx_dropped++;
		return NETDEV_TX_OK;
	}

	/* 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(dev_net(dev), &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);

		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(dev_net(dev), &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(dev_net(dev), &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(dev_net(dev), &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 chnl_net_destructor(struct net_device *dev)
{
	struct chnl_net *priv = netdev_priv(dev);
	caif_free_client(&priv->chnl);
	free_netdev(dev);
}

static void ipcaif_net_setup(struct net_device *dev)
{
	struct chnl_net *priv;
	dev->netdev_ops = &netdev_ops;
	dev->destructor = chnl_net_destructor;
	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 = UNDEF_CONNID;
	priv->flowenabled = false;

	init_waitqueue_head(&priv->netmgmt_wq);
}


static int ipcaif_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
	struct chnl_net *priv;
	u8 loop;
	priv = netdev_priv(dev);
	if (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))
		goto nla_put_failure;
	loop = priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP;
	if (nla_put_u8(skb, IFLA_CAIF_LOOPBACK, loop))
		goto nla_put_failure;
	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);

	ret = register_netdevice(dev);
	if (ret)
		pr_warn("device rtml registration failed\n");
	else
		list_add(&caifdev->list_field, &chnl_net_list);

	/* Use ifindex as connection id, and use loopback channel default. */
	if (caifdev->conn_req.sockaddr.u.dgm.connection_id == UNDEF_CONNID) {
		caifdev->conn_req.sockaddr.u.dgm.connection_id = dev->ifindex;
		caifdev->conn_req.protocol = CAIFPROTO_DATAGRAM_LOOP;
	}
	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	/*
cc36a070 SB	2	* Copyright (C) ST-Ericsson AB 2010
26ee65e6	3	* Authors: Sjur Brendeland
c2cd0a56	4	* Daniel Martensson
cc36a070 SB	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	10	#include <linux/fs.h>
a6b7a407	11	#include <linux/hardirq.h>
cc36a070 SB	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>
cc36a070 SB	23	#include <net/caif/cfpkt.h>
	24	#include <net/caif/caif_dev.h>
	25
8391c4aa	26	/* GPRS PDP connection has MTU to 1500 */
2aa40aef	27	#define GPRS_PDP_MTU 1500
8391c4aa SB	28	/* 5 sec. connect timeout */
8391c4aa SB	29	#define CONNECT_TIMEOUT (5 * HZ)
cc36a070	30	#define CAIF_NET_DEFAULT_QUEUE_LEN 500
e3abcc2a	31	#define UNDEF_CONNID 0xffffffff
cc36a070	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;
af2ce213	76	struct chnl_net *priv;
cc36a070	77	int pktlen;
d7b92aff KS	78	const u8 *ip_version;
d7b92aff KS	79	u8 buf;
cc36a070 SB	80
cc36a070 SB	81	priv = container_of(layr, struct chnl_net, chnl);
cc36a070 SB	82	if (!priv)
	83	return -EINVAL;
	84
3f874adc	85	skb = (struct sk_buff *) cfpkt_tonative(pkt);
3f874adc	86
cc36a070	87	/* Get length of CAIF packet. */
3f874adc	88	pktlen = skb->len;
cc36a070	89
cc36a070 SB	90	/* Pass some minimum information and
	91	* send the packet to the net stack.
	92	*/
	93	skb->dev = priv->netdev;
d7b92aff KS	94
	95	/* check the version of IP */
	96	ip_version = skb_header_pointer(skb, 0, 1, &buf);
d92c7f8a JJ	97	if (!ip_version) {
	98	kfree_skb(skb);
	99	return -EINVAL;
	100	}
576f3cc7	101
d7b92aff KS	102	switch (*ip_version >> 4) {
	103	case 4:
	104	skb->protocol = htons(ETH_P_IP);
	105	break;
	106	case 6:
	107	skb->protocol = htons(ETH_P_IPV6);
	108	break;
	109	default:
5c699fb7	110	kfree_skb(skb);
576f3cc7	111	priv->netdev->stats.rx_errors++;
d7b92aff KS	112	return -EINVAL;
d7b92aff KS	113	}
cc36a070 SB	114
	115	/* If we change the header in loop mode, the checksum is corrupted. */
	116	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
	117	skb->ip_summed = CHECKSUM_UNNECESSARY;
	118	else
	119	skb->ip_summed = CHECKSUM_NONE;
	120
cc36a070 SB	121	if (in_interrupt())
	122	netif_rx(skb);
	123	else
	124	netif_rx_ni(skb);
	125
	126	/* Update statistics. */
	127	priv->netdev->stats.rx_packets++;
	128	priv->netdev->stats.rx_bytes += pktlen;
	129
576f3cc7	130	return 0;
cc36a070 SB	131	}
	132
	133	static int delete_device(struct chnl_net *dev)
	134	{
	135	ASSERT_RTNL();
	136	if (dev->netdev)
	137	unregister_netdevice(dev->netdev);
	138	return 0;
	139	}
	140
	141	static void close_work(struct work_struct *work)
	142	{
	143	struct chnl_net *dev = NULL;
	144	struct list_head *list_node;
	145	struct list_head *_tmp;
41be5a4a	146
41be5a4a	147	rtnl_lock();
cc36a070 SB	148	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
cc36a070 SB	149	dev = list_entry(list_node, struct chnl_net, list_field);
8391c4aa SB	150	if (dev->state == CAIF_SHUTDOWN)
8391c4aa SB	151	dev_close(dev->netdev);
cc36a070	152	}
41be5a4a	153	rtnl_unlock();
cc36a070 SB	154	}
	155	static DECLARE_WORK(close_worker, close_work);
	156
b3ccfbe4	157	static void chnl_hold(struct cflayer *lyr)
	158	{
	159	struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
	160	dev_hold(priv->netdev);
	161	}
	162
	163	static void chnl_put(struct cflayer *lyr)
	164	{
	165	struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
	166	dev_put(priv->netdev);
	167	}
	168
cc36a070	169	static void chnl_flowctrl_cb(struct cflayer *layr, enum caif_ctrlcmd flow,
3bffc475	170	int phyid)
cc36a070	171	{
8391c4aa	172	struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
b31fa5ba	173	pr_debug("NET flowctrl func called flow: %s\n",
cc36a070 SB	174	flow == CAIF_CTRLCMD_FLOW_ON_IND ? "ON" :
	175	flow == CAIF_CTRLCMD_INIT_RSP ? "INIT" :
	176	flow == CAIF_CTRLCMD_FLOW_OFF_IND ? "OFF" :
	177	flow == CAIF_CTRLCMD_DEINIT_RSP ? "CLOSE/DEINIT" :
	178	flow == CAIF_CTRLCMD_INIT_FAIL_RSP ? "OPEN_FAIL" :
	179	flow == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND ?
	180	"REMOTE_SHUTDOWN" : "UKNOWN CTRL COMMAND");
	181
8391c4aa	182
cc36a070 SB	183
	184	switch (flow) {
	185	case CAIF_CTRLCMD_FLOW_OFF_IND:
8391c4aa SB	186	priv->flowenabled = false;
	187	netif_stop_queue(priv->netdev);
	188	break;
cc36a070	189	case CAIF_CTRLCMD_DEINIT_RSP:
8391c4aa SB	190	priv->state = CAIF_DISCONNECTED;
8391c4aa SB	191	break;
cc36a070	192	case CAIF_CTRLCMD_INIT_FAIL_RSP:
8391c4aa SB	193	priv->state = CAIF_DISCONNECTED;
	194	wake_up_interruptible(&priv->netmgmt_wq);
	195	break;
cc36a070	196	case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
8391c4aa	197	priv->state = CAIF_SHUTDOWN;
cc36a070	198	netif_tx_disable(priv->netdev);
cc36a070 SB	199	schedule_work(&close_worker);
	200	break;
	201	case CAIF_CTRLCMD_FLOW_ON_IND:
8391c4aa SB	202	priv->flowenabled = true;
	203	netif_wake_queue(priv->netdev);
	204	break;
cc36a070	205	case CAIF_CTRLCMD_INIT_RSP:
b3ccfbe4	206	caif_client_register_refcnt(&priv->chnl, chnl_hold, chnl_put);
8391c4aa	207	priv->state = CAIF_CONNECTED;
cc36a070 SB	208	priv->flowenabled = true;
	209	netif_wake_queue(priv->netdev);
	210	wake_up_interruptible(&priv->netmgmt_wq);
	211	break;
	212	default:
	213	break;
	214	}
	215	}
	216
	217	static int chnl_net_start_xmit(struct sk_buff skb, struct net_device dev)
	218	{
	219	struct chnl_net *priv;
	220	struct cfpkt *pkt = NULL;
	221	int len;
	222	int result = -1;
	223	/* Get our private data. */
	224	priv = netdev_priv(dev);
	225
	226	if (skb->len > priv->netdev->mtu) {
b31fa5ba	227	pr_warn("Size of skb exceeded MTU\n");
5c699fb7	228	kfree_skb(skb);
576f3cc7	229	dev->stats.tx_errors++;
5c699fb7	230	return NETDEV_TX_OK;
cc36a070 SB	231	}
	232
	233	if (!priv->flowenabled) {
b31fa5ba	234	pr_debug("dropping packets flow off\n");
5c699fb7	235	kfree_skb(skb);
576f3cc7	236	dev->stats.tx_dropped++;
5c699fb7	237	return NETDEV_TX_OK;
cc36a070 SB	238	}
	239
	240	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
	241	swap(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
	242
	243	/* Store original SKB length. */
	244	len = skb->len;
	245
	246	pkt = cfpkt_fromnative(CAIF_DIR_OUT, (void *) skb);
	247
cc36a070 SB	248	/* Send the packet down the stack. */
	249	result = priv->chnl.dn->transmit(priv->chnl.dn, pkt);
	250	if (result) {
576f3cc7	251	dev->stats.tx_dropped++;
5c699fb7	252	return NETDEV_TX_OK;
cc36a070 SB	253	}
	254
	255	/* Update statistics. */
	256	dev->stats.tx_packets++;
	257	dev->stats.tx_bytes += len;
	258
	259	return NETDEV_TX_OK;
	260	}
	261
	262	static int chnl_net_open(struct net_device *dev)
	263	{
	264	struct chnl_net *priv = NULL;
	265	int result = -1;
2aa40aef SB	266	int llifindex, headroom, tailroom, mtu;
2aa40aef SB	267	struct net_device *lldev;
cc36a070	268	ASSERT_RTNL();
cc36a070	269	priv = netdev_priv(dev);
cc36a070	270	if (!priv) {
b31fa5ba	271	pr_debug("chnl_net_open: no priv\n");
cc36a070 SB	272	return -ENODEV;
cc36a070 SB	273	}
8391c4aa SB	274
	275	if (priv->state != CAIF_CONNECTING) {
	276	priv->state = CAIF_CONNECTING;
bee925db	277	result = caif_connect_client(dev_net(dev), &priv->conn_req,
	278	&priv->chnl, &llifindex,
	279	&headroom, &tailroom);
8391c4aa	280	if (result != 0) {
b31fa5ba JP	281	pr_debug("err: "
	282	"Unable to register and open device,"
	283	" Err:%d\n",
	284	result);
2aa40aef SB	285	goto error;
	286	}
	287
a74e9426	288	lldev = __dev_get_by_index(dev_net(dev), llifindex);
2aa40aef SB	289
2aa40aef SB	290	if (lldev == NULL) {
b31fa5ba	291	pr_debug("no interface?\n");
2aa40aef SB	292	result = -ENODEV;
	293	goto error;
	294	}
	295
	296	dev->needed_tailroom = tailroom + lldev->needed_tailroom;
	297	dev->hard_header_len = headroom + lldev->hard_header_len +
	298	lldev->needed_tailroom;
	299
	300	/*
	301	* MTU, head-room etc is not know before we have a
	302	* CAIF link layer device available. MTU calculation may
	303	* override initial RTNL configuration.
	304	* MTU is minimum of current mtu, link layer mtu pluss
	305	* CAIF head and tail, and PDP GPRS contexts max MTU.
	306	*/
	307	mtu = min_t(int, dev->mtu, lldev->mtu - (headroom + tailroom));
	308	mtu = min_t(int, GPRS_PDP_MTU, mtu);
	309	dev_set_mtu(dev, mtu);
2aa40aef SB	310
2aa40aef SB	311	if (mtu < 100) {
b31fa5ba	312	pr_warn("CAIF Interface MTU too small (%d)\n", mtu);
2aa40aef SB	313	result = -ENODEV;
2aa40aef SB	314	goto error;
8391c4aa	315	}
cc36a070	316	}
8391c4aa	317
2aa40aef SB	318	rtnl_unlock(); /* Release RTNL lock during connect wait */
2aa40aef SB	319
8391c4aa SB	320	result = wait_event_interruptible_timeout(priv->netmgmt_wq,
	321	priv->state != CAIF_CONNECTING,
	322	CONNECT_TIMEOUT);
cc36a070	323
2aa40aef SB	324	rtnl_lock();
2aa40aef SB	325
cc36a070	326	if (result == -ERESTARTSYS) {
b31fa5ba	327	pr_debug("wait_event_interruptible woken by a signal\n");
2aa40aef SB	328	result = -ERESTARTSYS;
2aa40aef SB	329	goto error;
8391c4aa	330	}
2aa40aef	331
8391c4aa	332	if (result == 0) {
b31fa5ba	333	pr_debug("connect timeout\n");
bee925db	334	caif_disconnect_client(dev_net(dev), &priv->chnl);
8391c4aa	335	priv->state = CAIF_DISCONNECTED;
b31fa5ba	336	pr_debug("state disconnected\n");
2aa40aef SB	337	result = -ETIMEDOUT;
2aa40aef SB	338	goto error;
8391c4aa	339	}
cc36a070	340
8391c4aa	341	if (priv->state != CAIF_CONNECTED) {
b31fa5ba	342	pr_debug("connect failed\n");
2aa40aef SB	343	result = -ECONNREFUSED;
2aa40aef SB	344	goto error;
8391c4aa	345	}
b31fa5ba	346	pr_debug("CAIF Netdevice connected\n");
cc36a070	347	return 0;
2aa40aef SB	348
2aa40aef SB	349	error:
bee925db	350	caif_disconnect_client(dev_net(dev), &priv->chnl);
2aa40aef	351	priv->state = CAIF_DISCONNECTED;
b31fa5ba	352	pr_debug("state disconnected\n");
2aa40aef SB	353	return result;
2aa40aef SB	354
cc36a070 SB	355	}
	356
	357	static int chnl_net_stop(struct net_device *dev)
	358	{
	359	struct chnl_net *priv;
8391c4aa	360
cc36a070 SB	361	ASSERT_RTNL();
cc36a070 SB	362	priv = netdev_priv(dev);
8391c4aa	363	priv->state = CAIF_DISCONNECTED;
bee925db	364	caif_disconnect_client(dev_net(dev), &priv->chnl);
cc36a070 SB	365	return 0;
	366	}
	367
	368	static int chnl_net_init(struct net_device *dev)
	369	{
	370	struct chnl_net *priv;
	371	ASSERT_RTNL();
	372	priv = netdev_priv(dev);
	373	strncpy(priv->name, dev->name, sizeof(priv->name));
	374	return 0;
	375	}
	376
	377	static void chnl_net_uninit(struct net_device *dev)
	378	{
	379	struct chnl_net *priv;
	380	ASSERT_RTNL();
	381	priv = netdev_priv(dev);
	382	robust_list_del(&priv->list_field);
	383	}
	384
	385	static const struct net_device_ops netdev_ops = {
	386	.ndo_open = chnl_net_open,
	387	.ndo_stop = chnl_net_stop,
	388	.ndo_init = chnl_net_init,
	389	.ndo_uninit = chnl_net_uninit,
	390	.ndo_start_xmit = chnl_net_start_xmit,
	391	};
	392
b3ccfbe4	393	static void chnl_net_destructor(struct net_device *dev)
	394	{
	395	struct chnl_net *priv = netdev_priv(dev);
	396	caif_free_client(&priv->chnl);
	397	free_netdev(dev);
	398	}
	399
cc36a070 SB	400	static void ipcaif_net_setup(struct net_device *dev)
	401	{
	402	struct chnl_net *priv;
	403	dev->netdev_ops = &netdev_ops;
b3ccfbe4	404	dev->destructor = chnl_net_destructor;
cc36a070 SB	405	dev->flags \|= IFF_NOARP;
cc36a070 SB	406	dev->flags \|= IFF_POINTOPOINT;
2aa40aef	407	dev->mtu = GPRS_PDP_MTU;
cc36a070 SB	408	dev->tx_queue_len = CAIF_NET_DEFAULT_QUEUE_LEN;
	409
	410	priv = netdev_priv(dev);
	411	priv->chnl.receive = chnl_recv_cb;
	412	priv->chnl.ctrlcmd = chnl_flowctrl_cb;
	413	priv->netdev = dev;
	414	priv->conn_req.protocol = CAIFPROTO_DATAGRAM;
	415	priv->conn_req.link_selector = CAIF_LINK_HIGH_BANDW;
	416	priv->conn_req.priority = CAIF_PRIO_LOW;
	417	/* Insert illegal value */
e3abcc2a	418	priv->conn_req.sockaddr.u.dgm.connection_id = UNDEF_CONNID;
cc36a070 SB	419	priv->flowenabled = false;
cc36a070 SB	420
cc36a070	421	init_waitqueue_head(&priv->netmgmt_wq);
cc36a070 SB	422	}
	423
	424
	425	static int ipcaif_fill_info(struct sk_buff skb, const struct net_device dev)
	426	{
	427	struct chnl_net *priv;
	428	u8 loop;
	429	priv = netdev_priv(dev);
2809cec5 DM	430	if (nla_put_u32(skb, IFLA_CAIF_IPV4_CONNID,
	431	priv->conn_req.sockaddr.u.dgm.connection_id) \|\|
	432	nla_put_u32(skb, IFLA_CAIF_IPV6_CONNID,
	433	priv->conn_req.sockaddr.u.dgm.connection_id))
	434	goto nla_put_failure;
cc36a070	435	loop = priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP;
2809cec5 DM	436	if (nla_put_u8(skb, IFLA_CAIF_LOOPBACK, loop))
2809cec5 DM	437	goto nla_put_failure;
cc36a070 SB	438	return 0;
	439	nla_put_failure:
	440	return -EMSGSIZE;
	441
	442	}
	443
	444	static void caif_netlink_parms(struct nlattr *data[],
3bffc475	445	struct caif_connect_request *conn_req)
cc36a070 SB	446	{
cc36a070 SB	447	if (!data) {
b31fa5ba	448	pr_warn("no params data found\n");
cc36a070 SB	449	return;
	450	}
	451	if (data[IFLA_CAIF_IPV4_CONNID])
	452	conn_req->sockaddr.u.dgm.connection_id =
	453	nla_get_u32(data[IFLA_CAIF_IPV4_CONNID]);
	454	if (data[IFLA_CAIF_IPV6_CONNID])
	455	conn_req->sockaddr.u.dgm.connection_id =
	456	nla_get_u32(data[IFLA_CAIF_IPV6_CONNID]);
	457	if (data[IFLA_CAIF_LOOPBACK]) {
	458	if (nla_get_u8(data[IFLA_CAIF_LOOPBACK]))
	459	conn_req->protocol = CAIFPROTO_DATAGRAM_LOOP;
	460	else
	461	conn_req->protocol = CAIFPROTO_DATAGRAM;
	462	}
	463	}
	464
	465	static int ipcaif_newlink(struct net src_net, struct net_device dev,
	466	struct nlattr tb[], struct nlattr data[])
	467	{
	468	int ret;
	469	struct chnl_net *caifdev;
	470	ASSERT_RTNL();
	471	caifdev = netdev_priv(dev);
	472	caif_netlink_parms(data, &caifdev->conn_req);
8391c4aa	473
cc36a070 SB	474	ret = register_netdevice(dev);
cc36a070 SB	475	if (ret)
b31fa5ba	476	pr_warn("device rtml registration failed\n");
b2df5a84 DM	477	else
b2df5a84 DM	478	list_add(&caifdev->list_field, &chnl_net_list);
b3ccfbe4	479
e3abcc2a	480	/* Use ifindex as connection id, and use loopback channel default. */
e3abcc2a	481	if (caifdev->conn_req.sockaddr.u.dgm.connection_id == UNDEF_CONNID) {
b3ccfbe4	482	caifdev->conn_req.sockaddr.u.dgm.connection_id = dev->ifindex;
e3abcc2a	483	caifdev->conn_req.protocol = CAIFPROTO_DATAGRAM_LOOP;
e3abcc2a	484	}
cc36a070 SB	485	return ret;
	486	}
	487
	488	static int ipcaif_changelink(struct net_device dev, struct nlattr tb[],
3bffc475	489	struct nlattr *data[])
cc36a070 SB	490	{
	491	struct chnl_net *caifdev;
	492	ASSERT_RTNL();
	493	caifdev = netdev_priv(dev);
	494	caif_netlink_parms(data, &caifdev->conn_req);
	495	netdev_state_change(dev);
	496	return 0;
	497	}
	498
	499	static size_t ipcaif_get_size(const struct net_device *dev)
	500	{
	501	return
	502	/* IFLA_CAIF_IPV4_CONNID */
	503	nla_total_size(4) +
	504	/* IFLA_CAIF_IPV6_CONNID */
	505	nla_total_size(4) +
	506	/* IFLA_CAIF_LOOPBACK */
	507	nla_total_size(2) +
	508	0;
	509	}
	510
	511	static const struct nla_policy ipcaif_policy[IFLA_CAIF_MAX + 1] = {
	512	[IFLA_CAIF_IPV4_CONNID] = { .type = NLA_U32 },
	513	[IFLA_CAIF_IPV6_CONNID] = { .type = NLA_U32 },
	514	[IFLA_CAIF_LOOPBACK] = { .type = NLA_U8 }
	515	};
	516
	517
	518	static struct rtnl_link_ops ipcaif_link_ops __read_mostly = {
	519	.kind = "caif",
	520	.priv_size = sizeof(struct chnl_net),
	521	.setup = ipcaif_net_setup,
	522	.maxtype = IFLA_CAIF_MAX,
	523	.policy = ipcaif_policy,
	524	.newlink = ipcaif_newlink,
	525	.changelink = ipcaif_changelink,
	526	.get_size = ipcaif_get_size,
	527	.fill_info = ipcaif_fill_info,
	528
	529	};
	530
	531	static int __init chnl_init_module(void)
	532	{
	533	return rtnl_link_register(&ipcaif_link_ops);
	534	}
	535
	536	static void __exit chnl_exit_module(void)
	537	{
	538	struct chnl_net *dev = NULL;
	539	struct list_head *list_node;
	540	struct list_head *_tmp;
	541	rtnl_link_unregister(&ipcaif_link_ops);
	542	rtnl_lock();
	543	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
	544	dev = list_entry(list_node, struct chnl_net, list_field);
	545	list_del(list_node);
	546	delete_device(dev);
	547	}
	548	rtnl_unlock();
	549	}
	550
	551	module_init(chnl_init_module);
	552	module_exit(chnl_exit_module);