[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
 */

#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

#undef pr_debug
#define pr_debug pr_warning

/*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("CAIF: %s(): NET flowctrl func called flow: %s\n",
		__func__,
		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_warning("CAIF: %s(): Size of skb exceeded MTU\n", __func__);
		return -ENOSPC;
	}

	if (!priv->flowenabled) {
		pr_debug("CAIF: %s(): dropping packets flow off\n", __func__);
		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("CAIF: %s(): chnl_net_open: no priv\n", __func__);
		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("CAIF: %s(): err: "
					"Unable to register and open device,"
					" Err:%d\n",
					__func__,
					result);
				goto error;
		}

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

		if (lldev == NULL) {
			pr_debug("CAIF: %s(): no interface?\n", __func__);
			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_warning("CAIF: %s(): "
				"CAIF Interface MTU too small (%d)\n",
				__func__, 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("CAIF: %s(): wait_event_interruptible"
			 " woken by a signal\n", __func__);
		result = -ERESTARTSYS;
		goto error;
	}

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

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

error:
	caif_disconnect_client(&priv->chnl);
	priv->state = CAIF_DISCONNECTED;
	pr_debug("CAIF: %s(): state disconnected\n", __func__);
	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_warning("CAIF: %s: no params data found\n", __func__);
		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_warning("CAIF: %s(): device rtml registration failed\n",
			   __func__);
	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
	8	#include <linux/version.h>
	9	#include <linux/fs.h>
	10	#include <linux/init.h>
	11	#include <linux/module.h>
	12	#include <linux/netdevice.h>
	13	#include <linux/if_ether.h>
	14	#include <linux/moduleparam.h>
	15	#include <linux/ip.h>
	16	#include <linux/sched.h>
	17	#include <linux/sockios.h>
	18	#include <linux/caif/if_caif.h>
	19	#include <net/rtnetlink.h>
	20	#include <net/caif/caif_layer.h>
	21	#include <net/caif/cfcnfg.h>
	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 SB	29	#define CAIF_NET_DEFAULT_QUEUE_LEN 500
	30
	31	#undef pr_debug
	32	#define pr_debug pr_warning
	33
	34	/This list is protected by the rtnl lock. /
	35	static LIST_HEAD(chnl_net_list);
	36
	37	MODULE_LICENSE("GPL");
	38	MODULE_ALIAS_RTNL_LINK("caif");
	39
8391c4aa SB	40	enum caif_states {
	41	CAIF_CONNECTED = 1,
	42	CAIF_CONNECTING,
	43	CAIF_DISCONNECTED,
	44	CAIF_SHUTDOWN
	45	};
	46
cc36a070 SB	47	struct chnl_net {
	48	struct cflayer chnl;
	49	struct net_device_stats stats;
	50	struct caif_connect_request conn_req;
	51	struct list_head list_field;
	52	struct net_device *netdev;
	53	char name[256];
	54	wait_queue_head_t netmgmt_wq;
	55	/* Flow status to remember and control the transmission. */
	56	bool flowenabled;
8391c4aa	57	enum caif_states state;
cc36a070 SB	58	};
	59
	60	static void robust_list_del(struct list_head *delete_node)
	61	{
	62	struct list_head *list_node;
	63	struct list_head *n;
	64	ASSERT_RTNL();
	65	list_for_each_safe(list_node, n, &chnl_net_list) {
	66	if (list_node == delete_node) {
	67	list_del(list_node);
8391c4aa	68	return;
cc36a070 SB	69	}
cc36a070 SB	70	}
8391c4aa	71	WARN_ON(1);
cc36a070 SB	72	}
	73
	74	static int chnl_recv_cb(struct cflayer layr, struct cfpkt pkt)
	75	{
	76	struct sk_buff *skb;
8391c4aa	77	struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
cc36a070 SB	78	int pktlen;
	79	int err = 0;
	80
	81	priv = container_of(layr, struct chnl_net, chnl);
	82
	83	if (!priv)
	84	return -EINVAL;
	85
	86	/* Get length of CAIF packet. */
	87	pktlen = cfpkt_getlen(pkt);
	88
	89	skb = (struct sk_buff *) cfpkt_tonative(pkt);
	90	/* Pass some minimum information and
	91	* send the packet to the net stack.
	92	*/
	93	skb->dev = priv->netdev;
	94	skb->protocol = htons(ETH_P_IP);
	95
	96	/* If we change the header in loop mode, the checksum is corrupted. */
	97	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
	98	skb->ip_summed = CHECKSUM_UNNECESSARY;
	99	else
	100	skb->ip_summed = CHECKSUM_NONE;
	101
cc36a070 SB	102	if (in_interrupt())
	103	netif_rx(skb);
	104	else
	105	netif_rx_ni(skb);
	106
	107	/* Update statistics. */
	108	priv->netdev->stats.rx_packets++;
	109	priv->netdev->stats.rx_bytes += pktlen;
	110
	111	return err;
	112	}
	113
	114	static int delete_device(struct chnl_net *dev)
	115	{
	116	ASSERT_RTNL();
	117	if (dev->netdev)
	118	unregister_netdevice(dev->netdev);
	119	return 0;
	120	}
	121
	122	static void close_work(struct work_struct *work)
	123	{
	124	struct chnl_net *dev = NULL;
	125	struct list_head *list_node;
	126	struct list_head *_tmp;
8391c4aa SB	127	/* May be called with or without RTNL lock held */
	128	int islocked = rtnl_is_locked();
	129	if (!islocked)
	130	rtnl_lock();
cc36a070 SB	131	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
cc36a070 SB	132	dev = list_entry(list_node, struct chnl_net, list_field);
8391c4aa SB	133	if (dev->state == CAIF_SHUTDOWN)
8391c4aa SB	134	dev_close(dev->netdev);
cc36a070	135	}
8391c4aa SB	136	if (!islocked)
8391c4aa SB	137	rtnl_unlock();
cc36a070 SB	138	}
	139	static DECLARE_WORK(close_worker, close_work);
	140
	141	static void chnl_flowctrl_cb(struct cflayer *layr, enum caif_ctrlcmd flow,
	142	int phyid)
	143	{
8391c4aa SB	144	struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
8391c4aa SB	145	pr_debug("CAIF: %s(): NET flowctrl func called flow: %s\n",
cc36a070 SB	146	__func__,
	147	flow == CAIF_CTRLCMD_FLOW_ON_IND ? "ON" :
	148	flow == CAIF_CTRLCMD_INIT_RSP ? "INIT" :
	149	flow == CAIF_CTRLCMD_FLOW_OFF_IND ? "OFF" :
	150	flow == CAIF_CTRLCMD_DEINIT_RSP ? "CLOSE/DEINIT" :
	151	flow == CAIF_CTRLCMD_INIT_FAIL_RSP ? "OPEN_FAIL" :
	152	flow == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND ?
	153	"REMOTE_SHUTDOWN" : "UKNOWN CTRL COMMAND");
	154
8391c4aa	155
cc36a070 SB	156
	157	switch (flow) {
	158	case CAIF_CTRLCMD_FLOW_OFF_IND:
8391c4aa SB	159	priv->flowenabled = false;
	160	netif_stop_queue(priv->netdev);
	161	break;
cc36a070	162	case CAIF_CTRLCMD_DEINIT_RSP:
8391c4aa SB	163	priv->state = CAIF_DISCONNECTED;
8391c4aa SB	164	break;
cc36a070	165	case CAIF_CTRLCMD_INIT_FAIL_RSP:
8391c4aa SB	166	priv->state = CAIF_DISCONNECTED;
	167	wake_up_interruptible(&priv->netmgmt_wq);
	168	break;
cc36a070	169	case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
8391c4aa	170	priv->state = CAIF_SHUTDOWN;
cc36a070	171	netif_tx_disable(priv->netdev);
cc36a070 SB	172	schedule_work(&close_worker);
	173	break;
	174	case CAIF_CTRLCMD_FLOW_ON_IND:
8391c4aa SB	175	priv->flowenabled = true;
	176	netif_wake_queue(priv->netdev);
	177	break;
cc36a070	178	case CAIF_CTRLCMD_INIT_RSP:
8391c4aa	179	priv->state = CAIF_CONNECTED;
cc36a070 SB	180	priv->flowenabled = true;
	181	netif_wake_queue(priv->netdev);
	182	wake_up_interruptible(&priv->netmgmt_wq);
	183	break;
	184	default:
	185	break;
	186	}
	187	}
	188
	189	static int chnl_net_start_xmit(struct sk_buff skb, struct net_device dev)
	190	{
	191	struct chnl_net *priv;
	192	struct cfpkt *pkt = NULL;
	193	int len;
	194	int result = -1;
	195	/* Get our private data. */
	196	priv = netdev_priv(dev);
	197
	198	if (skb->len > priv->netdev->mtu) {
	199	pr_warning("CAIF: %s(): Size of skb exceeded MTU\n", __func__);
	200	return -ENOSPC;
	201	}
	202
	203	if (!priv->flowenabled) {
	204	pr_debug("CAIF: %s(): dropping packets flow off\n", __func__);
	205	return NETDEV_TX_BUSY;
	206	}
	207
	208	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
	209	swap(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
	210
	211	/* Store original SKB length. */
	212	len = skb->len;
	213
	214	pkt = cfpkt_fromnative(CAIF_DIR_OUT, (void *) skb);
	215
cc36a070 SB	216	/* Send the packet down the stack. */
	217	result = priv->chnl.dn->transmit(priv->chnl.dn, pkt);
	218	if (result) {
	219	if (result == -EAGAIN)
	220	result = NETDEV_TX_BUSY;
	221	return result;
	222	}
	223
	224	/* Update statistics. */
	225	dev->stats.tx_packets++;
	226	dev->stats.tx_bytes += len;
	227
	228	return NETDEV_TX_OK;
	229	}
	230
	231	static int chnl_net_open(struct net_device *dev)
	232	{
	233	struct chnl_net *priv = NULL;
	234	int result = -1;
2aa40aef SB	235	int llifindex, headroom, tailroom, mtu;
2aa40aef SB	236	struct net_device *lldev;
cc36a070	237	ASSERT_RTNL();
cc36a070	238	priv = netdev_priv(dev);
cc36a070 SB	239	if (!priv) {
	240	pr_debug("CAIF: %s(): chnl_net_open: no priv\n", __func__);
	241	return -ENODEV;
	242	}
8391c4aa SB	243
	244	if (priv->state != CAIF_CONNECTING) {
	245	priv->state = CAIF_CONNECTING;
2aa40aef SB	246	result = caif_connect_client(&priv->conn_req, &priv->chnl,
2aa40aef SB	247	&llifindex, &headroom, &tailroom);
8391c4aa	248	if (result != 0) {
8391c4aa SB	249	pr_debug("CAIF: %s(): err: "
	250	"Unable to register and open device,"
	251	" Err:%d\n",
	252	__func__,
	253	result);
2aa40aef SB	254	goto error;
	255	}
	256
	257	lldev = dev_get_by_index(dev_net(dev), llifindex);
	258
	259	if (lldev == NULL) {
	260	pr_debug("CAIF: %s(): no interface?\n", __func__);
	261	result = -ENODEV;
	262	goto error;
	263	}
	264
	265	dev->needed_tailroom = tailroom + lldev->needed_tailroom;
	266	dev->hard_header_len = headroom + lldev->hard_header_len +
	267	lldev->needed_tailroom;
	268
	269	/*
	270	* MTU, head-room etc is not know before we have a
	271	* CAIF link layer device available. MTU calculation may
	272	* override initial RTNL configuration.
	273	* MTU is minimum of current mtu, link layer mtu pluss
	274	* CAIF head and tail, and PDP GPRS contexts max MTU.
	275	*/
	276	mtu = min_t(int, dev->mtu, lldev->mtu - (headroom + tailroom));
	277	mtu = min_t(int, GPRS_PDP_MTU, mtu);
	278	dev_set_mtu(dev, mtu);
	279	dev_put(lldev);
	280
	281	if (mtu < 100) {
	282	pr_warning("CAIF: %s(): "
	283	"CAIF Interface MTU too small (%d)\n",
	284	__func__, mtu);
	285	result = -ENODEV;
	286	goto error;
8391c4aa	287	}
cc36a070	288	}
8391c4aa	289
2aa40aef SB	290	rtnl_unlock(); /* Release RTNL lock during connect wait */
2aa40aef SB	291
8391c4aa SB	292	result = wait_event_interruptible_timeout(priv->netmgmt_wq,
	293	priv->state != CAIF_CONNECTING,
	294	CONNECT_TIMEOUT);
cc36a070	295
2aa40aef SB	296	rtnl_lock();
2aa40aef SB	297
cc36a070 SB	298	if (result == -ERESTARTSYS) {
	299	pr_debug("CAIF: %s(): wait_event_interruptible"
	300	" woken by a signal\n", __func__);
2aa40aef SB	301	result = -ERESTARTSYS;
2aa40aef SB	302	goto error;
8391c4aa	303	}
2aa40aef	304
8391c4aa SB	305	if (result == 0) {
	306	pr_debug("CAIF: %s(): connect timeout\n", __func__);
	307	caif_disconnect_client(&priv->chnl);
	308	priv->state = CAIF_DISCONNECTED;
	309	pr_debug("CAIF: %s(): state disconnected\n", __func__);
2aa40aef SB	310	result = -ETIMEDOUT;
2aa40aef SB	311	goto error;
8391c4aa	312	}
cc36a070	313
8391c4aa SB	314	if (priv->state != CAIF_CONNECTED) {
8391c4aa SB	315	pr_debug("CAIF: %s(): connect failed\n", __func__);
2aa40aef SB	316	result = -ECONNREFUSED;
2aa40aef SB	317	goto error;
8391c4aa SB	318	}
8391c4aa SB	319	pr_debug("CAIF: %s(): CAIF Netdevice connected\n", __func__);
cc36a070	320	return 0;
2aa40aef SB	321
	322	error:
	323	caif_disconnect_client(&priv->chnl);
	324	priv->state = CAIF_DISCONNECTED;
	325	pr_debug("CAIF: %s(): state disconnected\n", __func__);
	326	return result;
	327
cc36a070 SB	328	}
	329
	330	static int chnl_net_stop(struct net_device *dev)
	331	{
	332	struct chnl_net *priv;
8391c4aa	333
cc36a070 SB	334	ASSERT_RTNL();
cc36a070 SB	335	priv = netdev_priv(dev);
8391c4aa SB	336	priv->state = CAIF_DISCONNECTED;
8391c4aa SB	337	caif_disconnect_client(&priv->chnl);
cc36a070 SB	338	return 0;
	339	}
	340
	341	static int chnl_net_init(struct net_device *dev)
	342	{
	343	struct chnl_net *priv;
	344	ASSERT_RTNL();
	345	priv = netdev_priv(dev);
	346	strncpy(priv->name, dev->name, sizeof(priv->name));
	347	return 0;
	348	}
	349
	350	static void chnl_net_uninit(struct net_device *dev)
	351	{
	352	struct chnl_net *priv;
	353	ASSERT_RTNL();
	354	priv = netdev_priv(dev);
	355	robust_list_del(&priv->list_field);
	356	}
	357
	358	static const struct net_device_ops netdev_ops = {
	359	.ndo_open = chnl_net_open,
	360	.ndo_stop = chnl_net_stop,
	361	.ndo_init = chnl_net_init,
	362	.ndo_uninit = chnl_net_uninit,
	363	.ndo_start_xmit = chnl_net_start_xmit,
	364	};
	365
	366	static void ipcaif_net_setup(struct net_device *dev)
	367	{
	368	struct chnl_net *priv;
	369	dev->netdev_ops = &netdev_ops;
	370	dev->destructor = free_netdev;
	371	dev->flags \|= IFF_NOARP;
	372	dev->flags \|= IFF_POINTOPOINT;
2aa40aef	373	dev->mtu = GPRS_PDP_MTU;
cc36a070 SB	374	dev->tx_queue_len = CAIF_NET_DEFAULT_QUEUE_LEN;
	375
	376	priv = netdev_priv(dev);
	377	priv->chnl.receive = chnl_recv_cb;
	378	priv->chnl.ctrlcmd = chnl_flowctrl_cb;
	379	priv->netdev = dev;
	380	priv->conn_req.protocol = CAIFPROTO_DATAGRAM;
	381	priv->conn_req.link_selector = CAIF_LINK_HIGH_BANDW;
	382	priv->conn_req.priority = CAIF_PRIO_LOW;
	383	/* Insert illegal value */
	384	priv->conn_req.sockaddr.u.dgm.connection_id = -1;
	385	priv->flowenabled = false;
	386
	387	ASSERT_RTNL();
	388	init_waitqueue_head(&priv->netmgmt_wq);
	389	list_add(&priv->list_field, &chnl_net_list);
	390	}
	391
	392
	393	static int ipcaif_fill_info(struct sk_buff skb, const struct net_device dev)
	394	{
	395	struct chnl_net *priv;
	396	u8 loop;
	397	priv = netdev_priv(dev);
	398	NLA_PUT_U32(skb, IFLA_CAIF_IPV4_CONNID,
	399	priv->conn_req.sockaddr.u.dgm.connection_id);
	400	NLA_PUT_U32(skb, IFLA_CAIF_IPV6_CONNID,
	401	priv->conn_req.sockaddr.u.dgm.connection_id);
	402	loop = priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP;
	403	NLA_PUT_U8(skb, IFLA_CAIF_LOOPBACK, loop);
	404
	405
	406	return 0;
	407	nla_put_failure:
	408	return -EMSGSIZE;
	409
	410	}
	411
	412	static void caif_netlink_parms(struct nlattr *data[],
	413	struct caif_connect_request *conn_req)
	414	{
	415	if (!data) {
	416	pr_warning("CAIF: %s: no params data found\n", __func__);
	417	return;
	418	}
	419	if (data[IFLA_CAIF_IPV4_CONNID])
	420	conn_req->sockaddr.u.dgm.connection_id =
	421	nla_get_u32(data[IFLA_CAIF_IPV4_CONNID]);
	422	if (data[IFLA_CAIF_IPV6_CONNID])
	423	conn_req->sockaddr.u.dgm.connection_id =
	424	nla_get_u32(data[IFLA_CAIF_IPV6_CONNID]);
	425	if (data[IFLA_CAIF_LOOPBACK]) {
	426	if (nla_get_u8(data[IFLA_CAIF_LOOPBACK]))
	427	conn_req->protocol = CAIFPROTO_DATAGRAM_LOOP;
	428	else
	429	conn_req->protocol = CAIFPROTO_DATAGRAM;
	430	}
	431	}
	432
	433	static int ipcaif_newlink(struct net src_net, struct net_device dev,
	434	struct nlattr tb[], struct nlattr data[])
	435	{
	436	int ret;
	437	struct chnl_net *caifdev;
438	ASSERT_RTNL();
439	caifdev = netdev_priv(dev);
440	caif_netlink_parms(data, &caifdev->conn_req);
8391c4aa SB	441	dev_net_set(caifdev->netdev, src_net);
8391c4aa SB	442
cc36a070 SB	443	ret = register_netdevice(dev);
	444	if (ret)
	445	pr_warning("CAIF: %s(): device rtml registration failed\n",
	446	__func__);
	447	return ret;
	448	}
	449
	450	static int ipcaif_changelink(struct net_device dev, struct nlattr tb[],
	451	struct nlattr *data[])
	452	{
	453	struct chnl_net *caifdev;
	454	ASSERT_RTNL();
	455	caifdev = netdev_priv(dev);
	456	caif_netlink_parms(data, &caifdev->conn_req);
	457	netdev_state_change(dev);
	458	return 0;
	459	}
	460
	461	static size_t ipcaif_get_size(const struct net_device *dev)
	462	{
	463	return
	464	/* IFLA_CAIF_IPV4_CONNID */
	465	nla_total_size(4) +
	466	/* IFLA_CAIF_IPV6_CONNID */
	467	nla_total_size(4) +
	468	/* IFLA_CAIF_LOOPBACK */
	469	nla_total_size(2) +
	470	0;
	471	}
	472
	473	static const struct nla_policy ipcaif_policy[IFLA_CAIF_MAX + 1] = {
	474	[IFLA_CAIF_IPV4_CONNID] = { .type = NLA_U32 },
	475	[IFLA_CAIF_IPV6_CONNID] = { .type = NLA_U32 },
	476	[IFLA_CAIF_LOOPBACK] = { .type = NLA_U8 }
	477	};
	478
	479
	480	static struct rtnl_link_ops ipcaif_link_ops __read_mostly = {
	481	.kind = "caif",
	482	.priv_size = sizeof(struct chnl_net),
	483	.setup = ipcaif_net_setup,
	484	.maxtype = IFLA_CAIF_MAX,
	485	.policy = ipcaif_policy,
	486	.newlink = ipcaif_newlink,
	487	.changelink = ipcaif_changelink,
	488	.get_size = ipcaif_get_size,
	489	.fill_info = ipcaif_fill_info,
	490
	491	};
	492
	493	static int __init chnl_init_module(void)
	494	{
	495	return rtnl_link_register(&ipcaif_link_ops);
	496	}
	497
	498	static void __exit chnl_exit_module(void)
	499	{
	500	struct chnl_net *dev = NULL;
	501	struct list_head *list_node;
	502	struct list_head *_tmp;
	503	rtnl_link_unregister(&ipcaif_link_ops);
	504	rtnl_lock();
	505	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
	506	dev = list_entry(list_node, struct chnl_net, list_field);
507	list_del(list_node);
508	delete_device(dev);
509	}
510	rtnl_unlock();
511	}
512
513	module_init(chnl_init_module);
514	module_exit(chnl_exit_module);