[deliverable/linux.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/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>
cc36a070 SB	16	#include <linux/ip.h>
	17	#include <linux/sched.h>
	18	#include <linux/sockios.h>
	19	#include <linux/caif/if_caif.h>
	20	#include <net/rtnetlink.h>
	21	#include <net/caif/caif_layer.h>
cc36a070 SB	22	#include <net/caif/cfpkt.h>
	23	#include <net/caif/caif_dev.h>
	24
8391c4aa	25	/* GPRS PDP connection has MTU to 1500 */
2aa40aef	26	#define GPRS_PDP_MTU 1500
8391c4aa SB	27	/* 5 sec. connect timeout */
8391c4aa SB	28	#define CONNECT_TIMEOUT (5 * HZ)
cc36a070	29	#define CAIF_NET_DEFAULT_QUEUE_LEN 500
e3abcc2a	30	#define UNDEF_CONNID 0xffffffff
cc36a070	31
cc36a070 SB	32	/This list is protected by the rtnl lock. /
	33	static LIST_HEAD(chnl_net_list);
	34
	35	MODULE_LICENSE("GPL");
	36	MODULE_ALIAS_RTNL_LINK("caif");
	37
8391c4aa SB	38	enum caif_states {
	39	CAIF_CONNECTED = 1,
	40	CAIF_CONNECTING,
	41	CAIF_DISCONNECTED,
	42	CAIF_SHUTDOWN
	43	};
	44
cc36a070 SB	45	struct chnl_net {
	46	struct cflayer chnl;
	47	struct net_device_stats stats;
	48	struct caif_connect_request conn_req;
	49	struct list_head list_field;
	50	struct net_device *netdev;
	51	char name[256];
	52	wait_queue_head_t netmgmt_wq;
	53	/* Flow status to remember and control the transmission. */
	54	bool flowenabled;
8391c4aa	55	enum caif_states state;
cc36a070 SB	56	};
	57
	58	static void robust_list_del(struct list_head *delete_node)
	59	{
	60	struct list_head *list_node;
	61	struct list_head *n;
	62	ASSERT_RTNL();
	63	list_for_each_safe(list_node, n, &chnl_net_list) {
	64	if (list_node == delete_node) {
	65	list_del(list_node);
8391c4aa	66	return;
cc36a070 SB	67	}
cc36a070 SB	68	}
8391c4aa	69	WARN_ON(1);
cc36a070 SB	70	}
	71
	72	static int chnl_recv_cb(struct cflayer layr, struct cfpkt pkt)
	73	{
	74	struct sk_buff *skb;
af2ce213	75	struct chnl_net *priv;
cc36a070	76	int pktlen;
d7b92aff KS	77	const u8 *ip_version;
d7b92aff KS	78	u8 buf;
cc36a070 SB	79
cc36a070 SB	80	priv = container_of(layr, struct chnl_net, chnl);
cc36a070 SB	81	if (!priv)
	82	return -EINVAL;
	83
3f874adc	84	skb = (struct sk_buff *) cfpkt_tonative(pkt);
3f874adc	85
cc36a070	86	/* Get length of CAIF packet. */
3f874adc	87	pktlen = skb->len;
cc36a070	88
cc36a070 SB	89	/* Pass some minimum information and
	90	* send the packet to the net stack.
	91	*/
	92	skb->dev = priv->netdev;
d7b92aff KS	93
	94	/* check the version of IP */
	95	ip_version = skb_header_pointer(skb, 0, 1, &buf);
d92c7f8a JJ	96	if (!ip_version) {
	97	kfree_skb(skb);
	98	return -EINVAL;
	99	}
576f3cc7	100
d7b92aff KS	101	switch (*ip_version >> 4) {
	102	case 4:
	103	skb->protocol = htons(ETH_P_IP);
	104	break;
	105	case 6:
	106	skb->protocol = htons(ETH_P_IPV6);
	107	break;
	108	default:
5c699fb7	109	kfree_skb(skb);
576f3cc7	110	priv->netdev->stats.rx_errors++;
d7b92aff KS	111	return -EINVAL;
d7b92aff KS	112	}
cc36a070 SB	113
	114	/* If we change the header in loop mode, the checksum is corrupted. */
	115	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
	116	skb->ip_summed = CHECKSUM_UNNECESSARY;
	117	else
	118	skb->ip_summed = CHECKSUM_NONE;
	119
cc36a070 SB	120	if (in_interrupt())
	121	netif_rx(skb);
	122	else
	123	netif_rx_ni(skb);
	124
	125	/* Update statistics. */
	126	priv->netdev->stats.rx_packets++;
	127	priv->netdev->stats.rx_bytes += pktlen;
	128
576f3cc7	129	return 0;
cc36a070 SB	130	}
	131
	132	static int delete_device(struct chnl_net *dev)
	133	{
	134	ASSERT_RTNL();
	135	if (dev->netdev)
	136	unregister_netdevice(dev->netdev);
	137	return 0;
	138	}
	139
	140	static void close_work(struct work_struct *work)
	141	{
	142	struct chnl_net *dev = NULL;
	143	struct list_head *list_node;
	144	struct list_head *_tmp;
41be5a4a	145
41be5a4a	146	rtnl_lock();
cc36a070 SB	147	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
cc36a070 SB	148	dev = list_entry(list_node, struct chnl_net, list_field);
8391c4aa SB	149	if (dev->state == CAIF_SHUTDOWN)
8391c4aa SB	150	dev_close(dev->netdev);
cc36a070	151	}
41be5a4a	152	rtnl_unlock();
cc36a070 SB	153	}
	154	static DECLARE_WORK(close_worker, close_work);
	155
b3ccfbe4	156	static void chnl_hold(struct cflayer *lyr)
	157	{
	158	struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
	159	dev_hold(priv->netdev);
	160	}
	161
	162	static void chnl_put(struct cflayer *lyr)
	163	{
	164	struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
	165	dev_put(priv->netdev);
	166	}
	167
cc36a070	168	static void chnl_flowctrl_cb(struct cflayer *layr, enum caif_ctrlcmd flow,
3bffc475	169	int phyid)
cc36a070	170	{
8391c4aa	171	struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
b31fa5ba	172	pr_debug("NET flowctrl func called flow: %s\n",
cc36a070 SB	173	flow == CAIF_CTRLCMD_FLOW_ON_IND ? "ON" :
	174	flow == CAIF_CTRLCMD_INIT_RSP ? "INIT" :
	175	flow == CAIF_CTRLCMD_FLOW_OFF_IND ? "OFF" :
	176	flow == CAIF_CTRLCMD_DEINIT_RSP ? "CLOSE/DEINIT" :
	177	flow == CAIF_CTRLCMD_INIT_FAIL_RSP ? "OPEN_FAIL" :
	178	flow == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND ?
	179	"REMOTE_SHUTDOWN" : "UKNOWN CTRL COMMAND");
	180
8391c4aa	181
cc36a070 SB	182
	183	switch (flow) {
	184	case CAIF_CTRLCMD_FLOW_OFF_IND:
8391c4aa SB	185	priv->flowenabled = false;
	186	netif_stop_queue(priv->netdev);
	187	break;
cc36a070	188	case CAIF_CTRLCMD_DEINIT_RSP:
8391c4aa SB	189	priv->state = CAIF_DISCONNECTED;
8391c4aa SB	190	break;
cc36a070	191	case CAIF_CTRLCMD_INIT_FAIL_RSP:
8391c4aa SB	192	priv->state = CAIF_DISCONNECTED;
	193	wake_up_interruptible(&priv->netmgmt_wq);
	194	break;
cc36a070	195	case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
8391c4aa	196	priv->state = CAIF_SHUTDOWN;
cc36a070	197	netif_tx_disable(priv->netdev);
cc36a070 SB	198	schedule_work(&close_worker);
	199	break;
	200	case CAIF_CTRLCMD_FLOW_ON_IND:
8391c4aa SB	201	priv->flowenabled = true;
	202	netif_wake_queue(priv->netdev);
	203	break;
cc36a070	204	case CAIF_CTRLCMD_INIT_RSP:
b3ccfbe4	205	caif_client_register_refcnt(&priv->chnl, chnl_hold, chnl_put);
8391c4aa	206	priv->state = CAIF_CONNECTED;
cc36a070 SB	207	priv->flowenabled = true;
	208	netif_wake_queue(priv->netdev);
	209	wake_up_interruptible(&priv->netmgmt_wq);
	210	break;
	211	default:
	212	break;
	213	}
	214	}
	215
	216	static int chnl_net_start_xmit(struct sk_buff skb, struct net_device dev)
	217	{
	218	struct chnl_net *priv;
	219	struct cfpkt *pkt = NULL;
	220	int len;
	221	int result = -1;
	222	/* Get our private data. */
	223	priv = netdev_priv(dev);
	224
	225	if (skb->len > priv->netdev->mtu) {
b31fa5ba	226	pr_warn("Size of skb exceeded MTU\n");
5c699fb7	227	kfree_skb(skb);
576f3cc7	228	dev->stats.tx_errors++;
5c699fb7	229	return NETDEV_TX_OK;
cc36a070 SB	230	}
	231
	232	if (!priv->flowenabled) {
b31fa5ba	233	pr_debug("dropping packets flow off\n");
5c699fb7	234	kfree_skb(skb);
576f3cc7	235	dev->stats.tx_dropped++;
5c699fb7	236	return NETDEV_TX_OK;
cc36a070 SB	237	}
	238
	239	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
	240	swap(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
	241
	242	/* Store original SKB length. */
	243	len = skb->len;
	244
	245	pkt = cfpkt_fromnative(CAIF_DIR_OUT, (void *) skb);
	246
cc36a070 SB	247	/* Send the packet down the stack. */
	248	result = priv->chnl.dn->transmit(priv->chnl.dn, pkt);
	249	if (result) {
576f3cc7	250	dev->stats.tx_dropped++;
5c699fb7	251	return NETDEV_TX_OK;
cc36a070 SB	252	}
	253
	254	/* Update statistics. */
	255	dev->stats.tx_packets++;
	256	dev->stats.tx_bytes += len;
	257
	258	return NETDEV_TX_OK;
	259	}
	260
	261	static int chnl_net_open(struct net_device *dev)
	262	{
	263	struct chnl_net *priv = NULL;
	264	int result = -1;
2aa40aef SB	265	int llifindex, headroom, tailroom, mtu;
2aa40aef SB	266	struct net_device *lldev;
cc36a070	267	ASSERT_RTNL();
cc36a070	268	priv = netdev_priv(dev);
cc36a070	269	if (!priv) {
b31fa5ba	270	pr_debug("chnl_net_open: no priv\n");
cc36a070 SB	271	return -ENODEV;
cc36a070 SB	272	}
8391c4aa SB	273
	274	if (priv->state != CAIF_CONNECTING) {
	275	priv->state = CAIF_CONNECTING;
bee925db	276	result = caif_connect_client(dev_net(dev), &priv->conn_req,
	277	&priv->chnl, &llifindex,
	278	&headroom, &tailroom);
8391c4aa	279	if (result != 0) {
b31fa5ba JP	280	pr_debug("err: "
	281	"Unable to register and open device,"
	282	" Err:%d\n",
	283	result);
2aa40aef SB	284	goto error;
	285	}
	286
a74e9426	287	lldev = __dev_get_by_index(dev_net(dev), llifindex);
2aa40aef SB	288
2aa40aef SB	289	if (lldev == NULL) {
b31fa5ba	290	pr_debug("no interface?\n");
2aa40aef SB	291	result = -ENODEV;
	292	goto error;
	293	}
	294
	295	dev->needed_tailroom = tailroom + lldev->needed_tailroom;
	296	dev->hard_header_len = headroom + lldev->hard_header_len +
	297	lldev->needed_tailroom;
	298
	299	/*
	300	* MTU, head-room etc is not know before we have a
	301	* CAIF link layer device available. MTU calculation may
	302	* override initial RTNL configuration.
	303	* MTU is minimum of current mtu, link layer mtu pluss
	304	* CAIF head and tail, and PDP GPRS contexts max MTU.
	305	*/
	306	mtu = min_t(int, dev->mtu, lldev->mtu - (headroom + tailroom));
	307	mtu = min_t(int, GPRS_PDP_MTU, mtu);
	308	dev_set_mtu(dev, mtu);
2aa40aef SB	309
2aa40aef SB	310	if (mtu < 100) {
b31fa5ba	311	pr_warn("CAIF Interface MTU too small (%d)\n", mtu);
2aa40aef SB	312	result = -ENODEV;
2aa40aef SB	313	goto error;
8391c4aa	314	}
cc36a070	315	}
8391c4aa	316
2aa40aef SB	317	rtnl_unlock(); /* Release RTNL lock during connect wait */
2aa40aef SB	318
8391c4aa SB	319	result = wait_event_interruptible_timeout(priv->netmgmt_wq,
	320	priv->state != CAIF_CONNECTING,
	321	CONNECT_TIMEOUT);
cc36a070	322
2aa40aef SB	323	rtnl_lock();
2aa40aef SB	324
cc36a070	325	if (result == -ERESTARTSYS) {
b31fa5ba	326	pr_debug("wait_event_interruptible woken by a signal\n");
2aa40aef SB	327	result = -ERESTARTSYS;
2aa40aef SB	328	goto error;
8391c4aa	329	}
2aa40aef	330
8391c4aa	331	if (result == 0) {
b31fa5ba	332	pr_debug("connect timeout\n");
bee925db	333	caif_disconnect_client(dev_net(dev), &priv->chnl);
8391c4aa	334	priv->state = CAIF_DISCONNECTED;
b31fa5ba	335	pr_debug("state disconnected\n");
2aa40aef SB	336	result = -ETIMEDOUT;
2aa40aef SB	337	goto error;
8391c4aa	338	}
cc36a070	339
8391c4aa	340	if (priv->state != CAIF_CONNECTED) {
b31fa5ba	341	pr_debug("connect failed\n");
2aa40aef SB	342	result = -ECONNREFUSED;
2aa40aef SB	343	goto error;
8391c4aa	344	}
b31fa5ba	345	pr_debug("CAIF Netdevice connected\n");
cc36a070	346	return 0;
2aa40aef SB	347
2aa40aef SB	348	error:
bee925db	349	caif_disconnect_client(dev_net(dev), &priv->chnl);
2aa40aef	350	priv->state = CAIF_DISCONNECTED;
b31fa5ba	351	pr_debug("state disconnected\n");
2aa40aef SB	352	return result;
2aa40aef SB	353
cc36a070 SB	354	}
	355
	356	static int chnl_net_stop(struct net_device *dev)
	357	{
	358	struct chnl_net *priv;
8391c4aa	359
cc36a070 SB	360	ASSERT_RTNL();
cc36a070 SB	361	priv = netdev_priv(dev);
8391c4aa	362	priv->state = CAIF_DISCONNECTED;
bee925db	363	caif_disconnect_client(dev_net(dev), &priv->chnl);
cc36a070 SB	364	return 0;
	365	}
	366
	367	static int chnl_net_init(struct net_device *dev)
	368	{
	369	struct chnl_net *priv;
	370	ASSERT_RTNL();
	371	priv = netdev_priv(dev);
	372	strncpy(priv->name, dev->name, sizeof(priv->name));
	373	return 0;
	374	}
	375
	376	static void chnl_net_uninit(struct net_device *dev)
	377	{
	378	struct chnl_net *priv;
	379	ASSERT_RTNL();
	380	priv = netdev_priv(dev);
	381	robust_list_del(&priv->list_field);
	382	}
	383
	384	static const struct net_device_ops netdev_ops = {
	385	.ndo_open = chnl_net_open,
	386	.ndo_stop = chnl_net_stop,
	387	.ndo_init = chnl_net_init,
	388	.ndo_uninit = chnl_net_uninit,
	389	.ndo_start_xmit = chnl_net_start_xmit,
	390	};
	391
b3ccfbe4	392	static void chnl_net_destructor(struct net_device *dev)
	393	{
	394	struct chnl_net *priv = netdev_priv(dev);
	395	caif_free_client(&priv->chnl);
	396	free_netdev(dev);
	397	}
	398
cc36a070 SB	399	static void ipcaif_net_setup(struct net_device *dev)
	400	{
	401	struct chnl_net *priv;
	402	dev->netdev_ops = &netdev_ops;
b3ccfbe4	403	dev->destructor = chnl_net_destructor;
cc36a070 SB	404	dev->flags \|= IFF_NOARP;
cc36a070 SB	405	dev->flags \|= IFF_POINTOPOINT;
2aa40aef	406	dev->mtu = GPRS_PDP_MTU;
cc36a070 SB	407	dev->tx_queue_len = CAIF_NET_DEFAULT_QUEUE_LEN;
	408
	409	priv = netdev_priv(dev);
	410	priv->chnl.receive = chnl_recv_cb;
	411	priv->chnl.ctrlcmd = chnl_flowctrl_cb;
	412	priv->netdev = dev;
	413	priv->conn_req.protocol = CAIFPROTO_DATAGRAM;
	414	priv->conn_req.link_selector = CAIF_LINK_HIGH_BANDW;
	415	priv->conn_req.priority = CAIF_PRIO_LOW;
	416	/* Insert illegal value */
e3abcc2a	417	priv->conn_req.sockaddr.u.dgm.connection_id = UNDEF_CONNID;
cc36a070 SB	418	priv->flowenabled = false;
cc36a070 SB	419
cc36a070	420	init_waitqueue_head(&priv->netmgmt_wq);
cc36a070 SB	421	}
	422
	423
	424	static int ipcaif_fill_info(struct sk_buff skb, const struct net_device dev)
	425	{
	426	struct chnl_net *priv;
	427	u8 loop;
	428	priv = netdev_priv(dev);
2809cec5 DM	429	if (nla_put_u32(skb, IFLA_CAIF_IPV4_CONNID,
	430	priv->conn_req.sockaddr.u.dgm.connection_id) \|\|
	431	nla_put_u32(skb, IFLA_CAIF_IPV6_CONNID,
	432	priv->conn_req.sockaddr.u.dgm.connection_id))
	433	goto nla_put_failure;
cc36a070	434	loop = priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP;
2809cec5 DM	435	if (nla_put_u8(skb, IFLA_CAIF_LOOPBACK, loop))
2809cec5 DM	436	goto nla_put_failure;
cc36a070 SB	437	return 0;
	438	nla_put_failure:
	439	return -EMSGSIZE;
	440
	441	}
	442
	443	static void caif_netlink_parms(struct nlattr *data[],
3bffc475	444	struct caif_connect_request *conn_req)
cc36a070 SB	445	{
cc36a070 SB	446	if (!data) {
b31fa5ba	447	pr_warn("no params data found\n");
cc36a070 SB	448	return;
	449	}
	450	if (data[IFLA_CAIF_IPV4_CONNID])
	451	conn_req->sockaddr.u.dgm.connection_id =
	452	nla_get_u32(data[IFLA_CAIF_IPV4_CONNID]);
	453	if (data[IFLA_CAIF_IPV6_CONNID])
	454	conn_req->sockaddr.u.dgm.connection_id =
	455	nla_get_u32(data[IFLA_CAIF_IPV6_CONNID]);
	456	if (data[IFLA_CAIF_LOOPBACK]) {
	457	if (nla_get_u8(data[IFLA_CAIF_LOOPBACK]))
	458	conn_req->protocol = CAIFPROTO_DATAGRAM_LOOP;
	459	else
	460	conn_req->protocol = CAIFPROTO_DATAGRAM;
	461	}
	462	}
	463
	464	static int ipcaif_newlink(struct net src_net, struct net_device dev,
	465	struct nlattr tb[], struct nlattr data[])
	466	{
	467	int ret;
	468	struct chnl_net *caifdev;
	469	ASSERT_RTNL();
	470	caifdev = netdev_priv(dev);
	471	caif_netlink_parms(data, &caifdev->conn_req);
8391c4aa	472
cc36a070 SB	473	ret = register_netdevice(dev);
cc36a070 SB	474	if (ret)
b31fa5ba	475	pr_warn("device rtml registration failed\n");
b2df5a84 DM	476	else
b2df5a84 DM	477	list_add(&caifdev->list_field, &chnl_net_list);
b3ccfbe4	478
e3abcc2a	479	/* Use ifindex as connection id, and use loopback channel default. */
e3abcc2a	480	if (caifdev->conn_req.sockaddr.u.dgm.connection_id == UNDEF_CONNID) {
b3ccfbe4	481	caifdev->conn_req.sockaddr.u.dgm.connection_id = dev->ifindex;
e3abcc2a	482	caifdev->conn_req.protocol = CAIFPROTO_DATAGRAM_LOOP;
e3abcc2a	483	}
cc36a070 SB	484	return ret;
	485	}
	486
	487	static int ipcaif_changelink(struct net_device dev, struct nlattr tb[],
3bffc475	488	struct nlattr *data[])
cc36a070 SB	489	{
	490	struct chnl_net *caifdev;
	491	ASSERT_RTNL();
	492	caifdev = netdev_priv(dev);
	493	caif_netlink_parms(data, &caifdev->conn_req);
	494	netdev_state_change(dev);
	495	return 0;
	496	}
	497
	498	static size_t ipcaif_get_size(const struct net_device *dev)
	499	{
	500	return
	501	/* IFLA_CAIF_IPV4_CONNID */
	502	nla_total_size(4) +
	503	/* IFLA_CAIF_IPV6_CONNID */
	504	nla_total_size(4) +
	505	/* IFLA_CAIF_LOOPBACK */
	506	nla_total_size(2) +
	507	0;
	508	}
	509
	510	static const struct nla_policy ipcaif_policy[IFLA_CAIF_MAX + 1] = {
	511	[IFLA_CAIF_IPV4_CONNID] = { .type = NLA_U32 },
	512	[IFLA_CAIF_IPV6_CONNID] = { .type = NLA_U32 },
	513	[IFLA_CAIF_LOOPBACK] = { .type = NLA_U8 }
	514	};
	515
	516
	517	static struct rtnl_link_ops ipcaif_link_ops __read_mostly = {
	518	.kind = "caif",
	519	.priv_size = sizeof(struct chnl_net),
	520	.setup = ipcaif_net_setup,
	521	.maxtype = IFLA_CAIF_MAX,
	522	.policy = ipcaif_policy,
	523	.newlink = ipcaif_newlink,
	524	.changelink = ipcaif_changelink,
	525	.get_size = ipcaif_get_size,
	526	.fill_info = ipcaif_fill_info,
	527
	528	};
	529
	530	static int __init chnl_init_module(void)
	531	{
	532	return rtnl_link_register(&ipcaif_link_ops);
	533	}
	534
	535	static void __exit chnl_exit_module(void)
	536	{
	537	struct chnl_net *dev = NULL;
	538	struct list_head *list_node;
	539	struct list_head *_tmp;
	540	rtnl_link_unregister(&ipcaif_link_ops);
	541	rtnl_lock();
	542	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
	543	dev = list_entry(list_node, struct chnl_net, list_field);
	544	list_del(list_node);
	545	delete_device(dev);
	546	}
	547	rtnl_unlock();
	548	}
	549
	550	module_init(chnl_init_module);
	551	module_exit(chnl_exit_module);