[mirror_ubuntu-artful-kernel.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/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);

	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);
		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(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);
	dev_net_set(caifdev->netdev, src_net);

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