[deliverable/linux.git] / net / caif / chnl_net.c

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

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

#include <linux/version.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/if_ether.h>
#include <linux/moduleparam.h>
#include <linux/ip.h>
#include <linux/sched.h>
#include <linux/sockios.h>
#include <linux/caif/if_caif.h>
#include <net/rtnetlink.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfcnfg.h>
#include <net/caif/cfpkt.h>
#include <net/caif/caif_dev.h>

/* GPRS PDP connection has MTU to 1500 */
#define GPRS_PDP_MTU 1500
/* 5 sec. connect timeout */
#define CONNECT_TIMEOUT (5 * HZ)
#define CAIF_NET_DEFAULT_QUEUE_LEN 500

/*This list is protected by the rtnl lock. */
static LIST_HEAD(chnl_net_list);

MODULE_LICENSE("GPL");
MODULE_ALIAS_RTNL_LINK("caif");

enum caif_states {
	CAIF_CONNECTED		= 1,
	CAIF_CONNECTING,
	CAIF_DISCONNECTED,
	CAIF_SHUTDOWN
};

struct chnl_net {
	struct cflayer chnl;
	struct net_device_stats stats;
	struct caif_connect_request conn_req;
	struct list_head list_field;
	struct net_device *netdev;
	char name[256];
	wait_queue_head_t netmgmt_wq;
	/* Flow status to remember and control the transmission. */
	bool flowenabled;
	enum caif_states state;
};

static void robust_list_del(struct list_head *delete_node)
{
	struct list_head *list_node;
	struct list_head *n;
	ASSERT_RTNL();
	list_for_each_safe(list_node, n, &chnl_net_list) {
		if (list_node == delete_node) {
			list_del(list_node);
			return;
		}
	}
	WARN_ON(1);
}

static int chnl_recv_cb(struct cflayer *layr, struct cfpkt *pkt)
{
	struct sk_buff *skb;
	struct chnl_net *priv  = container_of(layr, struct chnl_net, chnl);
	int pktlen;
	int err = 0;
	const u8 *ip_version;
	u8 buf;

	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;

	/* check the version of IP */
	ip_version = skb_header_pointer(skb, 0, 1, &buf);
	if (!ip_version)
		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:
		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 err;
}

static int delete_device(struct chnl_net *dev)
{
	ASSERT_RTNL();
	if (dev->netdev)
		unregister_netdevice(dev->netdev);
	return 0;
}

static void close_work(struct work_struct *work)
{
	struct chnl_net *dev = NULL;
	struct list_head *list_node;
	struct list_head *_tmp;
	/* May be called with or without RTNL lock held */
	int islocked = rtnl_is_locked();
	if (!islocked)
		rtnl_lock();
	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
		dev = list_entry(list_node, struct chnl_net, list_field);
		if (dev->state == CAIF_SHUTDOWN)
			dev_close(dev->netdev);
	}
	if (!islocked)
		rtnl_unlock();
}
static DECLARE_WORK(close_worker, close_work);

static void chnl_flowctrl_cb(struct cflayer *layr, enum caif_ctrlcmd flow,
				int phyid)
{
	struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
	pr_debug("NET flowctrl func called flow: %s\n",
		flow == CAIF_CTRLCMD_FLOW_ON_IND ? "ON" :
		flow == CAIF_CTRLCMD_INIT_RSP ? "INIT" :
		flow == CAIF_CTRLCMD_FLOW_OFF_IND ? "OFF" :
		flow == CAIF_CTRLCMD_DEINIT_RSP ? "CLOSE/DEINIT" :
		flow == CAIF_CTRLCMD_INIT_FAIL_RSP ? "OPEN_FAIL" :
		flow == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND ?
		 "REMOTE_SHUTDOWN" : "UKNOWN CTRL COMMAND");


	switch (flow) {
	case CAIF_CTRLCMD_FLOW_OFF_IND:
		priv->flowenabled = false;
		netif_stop_queue(priv->netdev);
		break;
	case CAIF_CTRLCMD_DEINIT_RSP:
		priv->state = CAIF_DISCONNECTED;
		break;
	case CAIF_CTRLCMD_INIT_FAIL_RSP:
		priv->state = CAIF_DISCONNECTED;
		wake_up_interruptible(&priv->netmgmt_wq);
		break;
	case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
		priv->state = CAIF_SHUTDOWN;
		netif_tx_disable(priv->netdev);
		schedule_work(&close_worker);
		break;
	case CAIF_CTRLCMD_FLOW_ON_IND:
		priv->flowenabled = true;
		netif_wake_queue(priv->netdev);
		break;
	case CAIF_CTRLCMD_INIT_RSP:
		priv->state = CAIF_CONNECTED;
		priv->flowenabled = true;
		netif_wake_queue(priv->netdev);
		wake_up_interruptible(&priv->netmgmt_wq);
		break;
	default:
		break;
	}
}

static int chnl_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct chnl_net *priv;
	struct cfpkt *pkt = NULL;
	int len;
	int result = -1;
	/* Get our private data. */
	priv = netdev_priv(dev);

	if (skb->len > priv->netdev->mtu) {
		pr_warn("Size of skb exceeded MTU\n");
		return -ENOSPC;
	}

	if (!priv->flowenabled) {
		pr_debug("dropping packets flow off\n");
		return NETDEV_TX_BUSY;
	}

	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
		swap(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);

	/* Store original SKB length. */
	len = skb->len;

	pkt = cfpkt_fromnative(CAIF_DIR_OUT, (void *) skb);

	/* Send the packet down the stack. */
	result = priv->chnl.dn->transmit(priv->chnl.dn, pkt);
	if (result) {
		if (result == -EAGAIN)
			result = NETDEV_TX_BUSY;
		return result;
	}

	/* Update statistics. */
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += len;

	return NETDEV_TX_OK;
}

static int chnl_net_open(struct net_device *dev)
{
	struct chnl_net *priv = NULL;
	int result = -1;
	int llifindex, headroom, tailroom, mtu;
	struct net_device *lldev;
	ASSERT_RTNL();
	priv = netdev_priv(dev);
	if (!priv) {
		pr_debug("chnl_net_open: no priv\n");
		return -ENODEV;
	}

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

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

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

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

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

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

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

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

	rtnl_lock();

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

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

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

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

}

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

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

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

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

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

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

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

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


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


	return 0;
nla_put_failure:
	return -EMSGSIZE;

}

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

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

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

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

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

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


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

};

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

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

module_init(chnl_init_module);
module_exit(chnl_exit_module);
Commit	Line	Data
cc36a070 SB	1	/*
	2	* Copyright (C) ST-Ericsson AB 2010
	3	* Authors: Sjur Brendeland/sjur.brandeland@stericsson.com
	4	* Daniel Martensson / Daniel.Martensson@stericsson.com
	5	* License terms: GNU General Public License (GPL) version 2
	6	*/
	7
b31fa5ba JP	8	#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
b31fa5ba JP	9
cc36a070 SB	10	#include <linux/version.h>
	11	#include <linux/fs.h>
	12	#include <linux/init.h>
	13	#include <linux/module.h>
	14	#include <linux/netdevice.h>
	15	#include <linux/if_ether.h>
	16	#include <linux/moduleparam.h>
	17	#include <linux/ip.h>
	18	#include <linux/sched.h>
	19	#include <linux/sockios.h>
	20	#include <linux/caif/if_caif.h>
	21	#include <net/rtnetlink.h>
	22	#include <net/caif/caif_layer.h>
	23	#include <net/caif/cfcnfg.h>
	24	#include <net/caif/cfpkt.h>
	25	#include <net/caif/caif_dev.h>
	26
8391c4aa	27	/* GPRS PDP connection has MTU to 1500 */
2aa40aef	28	#define GPRS_PDP_MTU 1500
8391c4aa SB	29	/* 5 sec. connect timeout */
8391c4aa SB	30	#define CONNECT_TIMEOUT (5 * HZ)
cc36a070 SB	31	#define CAIF_NET_DEFAULT_QUEUE_LEN 500
cc36a070 SB	32
cc36a070 SB	33	/This list is protected by the rtnl lock. /
	34	static LIST_HEAD(chnl_net_list);
	35
	36	MODULE_LICENSE("GPL");
	37	MODULE_ALIAS_RTNL_LINK("caif");
	38
8391c4aa SB	39	enum caif_states {
	40	CAIF_CONNECTED = 1,
	41	CAIF_CONNECTING,
	42	CAIF_DISCONNECTED,
	43	CAIF_SHUTDOWN
	44	};
	45
cc36a070 SB	46	struct chnl_net {
	47	struct cflayer chnl;
	48	struct net_device_stats stats;
	49	struct caif_connect_request conn_req;
	50	struct list_head list_field;
	51	struct net_device *netdev;
	52	char name[256];
	53	wait_queue_head_t netmgmt_wq;
	54	/* Flow status to remember and control the transmission. */
	55	bool flowenabled;
8391c4aa	56	enum caif_states state;
cc36a070 SB	57	};
	58
	59	static void robust_list_del(struct list_head *delete_node)
	60	{
	61	struct list_head *list_node;
	62	struct list_head *n;
	63	ASSERT_RTNL();
	64	list_for_each_safe(list_node, n, &chnl_net_list) {
	65	if (list_node == delete_node) {
	66	list_del(list_node);
8391c4aa	67	return;
cc36a070 SB	68	}
cc36a070 SB	69	}
8391c4aa	70	WARN_ON(1);
cc36a070 SB	71	}
	72
	73	static int chnl_recv_cb(struct cflayer layr, struct cfpkt pkt)
	74	{
	75	struct sk_buff *skb;
8391c4aa	76	struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
cc36a070 SB	77	int pktlen;
cc36a070 SB	78	int err = 0;
d7b92aff KS	79	const u8 *ip_version;
d7b92aff KS	80	u8 buf;
cc36a070 SB	81
	82	priv = container_of(layr, struct chnl_net, chnl);
	83
	84	if (!priv)
	85	return -EINVAL;
	86
	87	/* Get length of CAIF packet. */
	88	pktlen = cfpkt_getlen(pkt);
	89
	90	skb = (struct sk_buff *) cfpkt_tonative(pkt);
	91	/* Pass some minimum information and
	92	* send the packet to the net stack.
	93	*/
	94	skb->dev = priv->netdev;
d7b92aff KS	95
	96	/* check the version of IP */
	97	ip_version = skb_header_pointer(skb, 0, 1, &buf);
	98	if (!ip_version)
	99	return -EINVAL;
	100	switch (*ip_version >> 4) {
	101	case 4:
	102	skb->protocol = htons(ETH_P_IP);
	103	break;
	104	case 6:
	105	skb->protocol = htons(ETH_P_IPV6);
	106	break;
	107	default:
	108	return -EINVAL;
	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
	126	return err;
	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;
8391c4aa SB	142	/* May be called with or without RTNL lock held */
	143	int islocked = rtnl_is_locked();
	144	if (!islocked)
	145	rtnl_lock();
cc36a070 SB	146	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
cc36a070 SB	147	dev = list_entry(list_node, struct chnl_net, list_field);
8391c4aa SB	148	if (dev->state == CAIF_SHUTDOWN)
8391c4aa SB	149	dev_close(dev->netdev);
cc36a070	150	}
8391c4aa SB	151	if (!islocked)
8391c4aa SB	152	rtnl_unlock();
cc36a070 SB	153	}
	154	static DECLARE_WORK(close_worker, close_work);
	155
	156	static void chnl_flowctrl_cb(struct cflayer *layr, enum caif_ctrlcmd flow,
	157	int phyid)
	158	{
8391c4aa	159	struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
b31fa5ba	160	pr_debug("NET flowctrl func called flow: %s\n",
cc36a070 SB	161	flow == CAIF_CTRLCMD_FLOW_ON_IND ? "ON" :
	162	flow == CAIF_CTRLCMD_INIT_RSP ? "INIT" :
	163	flow == CAIF_CTRLCMD_FLOW_OFF_IND ? "OFF" :
	164	flow == CAIF_CTRLCMD_DEINIT_RSP ? "CLOSE/DEINIT" :
	165	flow == CAIF_CTRLCMD_INIT_FAIL_RSP ? "OPEN_FAIL" :
	166	flow == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND ?
	167	"REMOTE_SHUTDOWN" : "UKNOWN CTRL COMMAND");
	168
8391c4aa	169
cc36a070 SB	170
	171	switch (flow) {
	172	case CAIF_CTRLCMD_FLOW_OFF_IND:
8391c4aa SB	173	priv->flowenabled = false;
	174	netif_stop_queue(priv->netdev);
	175	break;
cc36a070	176	case CAIF_CTRLCMD_DEINIT_RSP:
8391c4aa SB	177	priv->state = CAIF_DISCONNECTED;
8391c4aa SB	178	break;
cc36a070	179	case CAIF_CTRLCMD_INIT_FAIL_RSP:
8391c4aa SB	180	priv->state = CAIF_DISCONNECTED;
	181	wake_up_interruptible(&priv->netmgmt_wq);
	182	break;
cc36a070	183	case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
8391c4aa	184	priv->state = CAIF_SHUTDOWN;
cc36a070	185	netif_tx_disable(priv->netdev);
cc36a070 SB	186	schedule_work(&close_worker);
	187	break;
	188	case CAIF_CTRLCMD_FLOW_ON_IND:
8391c4aa SB	189	priv->flowenabled = true;
	190	netif_wake_queue(priv->netdev);
	191	break;
cc36a070	192	case CAIF_CTRLCMD_INIT_RSP:
8391c4aa	193	priv->state = CAIF_CONNECTED;
cc36a070 SB	194	priv->flowenabled = true;
	195	netif_wake_queue(priv->netdev);
	196	wake_up_interruptible(&priv->netmgmt_wq);
	197	break;
	198	default:
	199	break;
	200	}
	201	}
	202
	203	static int chnl_net_start_xmit(struct sk_buff skb, struct net_device dev)
	204	{
	205	struct chnl_net *priv;
	206	struct cfpkt *pkt = NULL;
	207	int len;
	208	int result = -1;
	209	/* Get our private data. */
	210	priv = netdev_priv(dev);
	211
	212	if (skb->len > priv->netdev->mtu) {
b31fa5ba	213	pr_warn("Size of skb exceeded MTU\n");
cc36a070 SB	214	return -ENOSPC;
	215	}
	216
	217	if (!priv->flowenabled) {
b31fa5ba	218	pr_debug("dropping packets flow off\n");
cc36a070 SB	219	return NETDEV_TX_BUSY;
	220	}
	221
	222	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
	223	swap(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
	224
	225	/* Store original SKB length. */
	226	len = skb->len;
	227
	228	pkt = cfpkt_fromnative(CAIF_DIR_OUT, (void *) skb);
	229
cc36a070 SB	230	/* Send the packet down the stack. */
	231	result = priv->chnl.dn->transmit(priv->chnl.dn, pkt);
	232	if (result) {
	233	if (result == -EAGAIN)
	234	result = NETDEV_TX_BUSY;
	235	return result;
	236	}
	237
	238	/* Update statistics. */
	239	dev->stats.tx_packets++;
	240	dev->stats.tx_bytes += len;
	241
	242	return NETDEV_TX_OK;
	243	}
	244
	245	static int chnl_net_open(struct net_device *dev)
	246	{
	247	struct chnl_net *priv = NULL;
	248	int result = -1;
2aa40aef SB	249	int llifindex, headroom, tailroom, mtu;
2aa40aef SB	250	struct net_device *lldev;
cc36a070	251	ASSERT_RTNL();
cc36a070	252	priv = netdev_priv(dev);
cc36a070	253	if (!priv) {
b31fa5ba	254	pr_debug("chnl_net_open: no priv\n");
cc36a070 SB	255	return -ENODEV;
cc36a070 SB	256	}
8391c4aa SB	257
	258	if (priv->state != CAIF_CONNECTING) {
	259	priv->state = CAIF_CONNECTING;
2aa40aef SB	260	result = caif_connect_client(&priv->conn_req, &priv->chnl,
2aa40aef SB	261	&llifindex, &headroom, &tailroom);
8391c4aa	262	if (result != 0) {
b31fa5ba JP	263	pr_debug("err: "
	264	"Unable to register and open device,"
	265	" Err:%d\n",
	266	result);
2aa40aef SB	267	goto error;
	268	}
	269
	270	lldev = dev_get_by_index(dev_net(dev), llifindex);
	271
	272	if (lldev == NULL) {
b31fa5ba	273	pr_debug("no interface?\n");
2aa40aef SB	274	result = -ENODEV;
	275	goto error;
	276	}
	277
	278	dev->needed_tailroom = tailroom + lldev->needed_tailroom;
	279	dev->hard_header_len = headroom + lldev->hard_header_len +
	280	lldev->needed_tailroom;
	281
	282	/*
	283	* MTU, head-room etc is not know before we have a
	284	* CAIF link layer device available. MTU calculation may
	285	* override initial RTNL configuration.
	286	* MTU is minimum of current mtu, link layer mtu pluss
	287	* CAIF head and tail, and PDP GPRS contexts max MTU.
	288	*/
	289	mtu = min_t(int, dev->mtu, lldev->mtu - (headroom + tailroom));
	290	mtu = min_t(int, GPRS_PDP_MTU, mtu);
	291	dev_set_mtu(dev, mtu);
	292	dev_put(lldev);
	293
	294	if (mtu < 100) {
b31fa5ba	295	pr_warn("CAIF Interface MTU too small (%d)\n", mtu);
2aa40aef SB	296	result = -ENODEV;
2aa40aef SB	297	goto error;
8391c4aa	298	}
cc36a070	299	}
8391c4aa	300
2aa40aef SB	301	rtnl_unlock(); /* Release RTNL lock during connect wait */
2aa40aef SB	302
8391c4aa SB	303	result = wait_event_interruptible_timeout(priv->netmgmt_wq,
	304	priv->state != CAIF_CONNECTING,
	305	CONNECT_TIMEOUT);
cc36a070	306
2aa40aef SB	307	rtnl_lock();
2aa40aef SB	308
cc36a070	309	if (result == -ERESTARTSYS) {
b31fa5ba	310	pr_debug("wait_event_interruptible woken by a signal\n");
2aa40aef SB	311	result = -ERESTARTSYS;
2aa40aef SB	312	goto error;
8391c4aa	313	}
2aa40aef	314
8391c4aa	315	if (result == 0) {
b31fa5ba	316	pr_debug("connect timeout\n");
8391c4aa SB	317	caif_disconnect_client(&priv->chnl);
8391c4aa SB	318	priv->state = CAIF_DISCONNECTED;
b31fa5ba	319	pr_debug("state disconnected\n");
2aa40aef SB	320	result = -ETIMEDOUT;
2aa40aef SB	321	goto error;
8391c4aa	322	}
cc36a070	323
8391c4aa	324	if (priv->state != CAIF_CONNECTED) {
b31fa5ba	325	pr_debug("connect failed\n");
2aa40aef SB	326	result = -ECONNREFUSED;
2aa40aef SB	327	goto error;
8391c4aa	328	}
b31fa5ba	329	pr_debug("CAIF Netdevice connected\n");
cc36a070	330	return 0;
2aa40aef SB	331
	332	error:
	333	caif_disconnect_client(&priv->chnl);
	334	priv->state = CAIF_DISCONNECTED;
b31fa5ba	335	pr_debug("state disconnected\n");
2aa40aef SB	336	return result;
2aa40aef SB	337
cc36a070 SB	338	}
	339
	340	static int chnl_net_stop(struct net_device *dev)
	341	{
	342	struct chnl_net *priv;
8391c4aa	343
cc36a070 SB	344	ASSERT_RTNL();
cc36a070 SB	345	priv = netdev_priv(dev);
8391c4aa SB	346	priv->state = CAIF_DISCONNECTED;
8391c4aa SB	347	caif_disconnect_client(&priv->chnl);
cc36a070 SB	348	return 0;
	349	}
	350
	351	static int chnl_net_init(struct net_device *dev)
	352	{
	353	struct chnl_net *priv;
	354	ASSERT_RTNL();
	355	priv = netdev_priv(dev);
	356	strncpy(priv->name, dev->name, sizeof(priv->name));
	357	return 0;
	358	}
	359
	360	static void chnl_net_uninit(struct net_device *dev)
	361	{
	362	struct chnl_net *priv;
	363	ASSERT_RTNL();
	364	priv = netdev_priv(dev);
	365	robust_list_del(&priv->list_field);
	366	}
	367
	368	static const struct net_device_ops netdev_ops = {
	369	.ndo_open = chnl_net_open,
	370	.ndo_stop = chnl_net_stop,
	371	.ndo_init = chnl_net_init,
	372	.ndo_uninit = chnl_net_uninit,
	373	.ndo_start_xmit = chnl_net_start_xmit,
	374	};
	375
	376	static void ipcaif_net_setup(struct net_device *dev)
	377	{
	378	struct chnl_net *priv;
	379	dev->netdev_ops = &netdev_ops;
	380	dev->destructor = free_netdev;
	381	dev->flags \|= IFF_NOARP;
	382	dev->flags \|= IFF_POINTOPOINT;
2aa40aef	383	dev->mtu = GPRS_PDP_MTU;
cc36a070 SB	384	dev->tx_queue_len = CAIF_NET_DEFAULT_QUEUE_LEN;
	385
	386	priv = netdev_priv(dev);
	387	priv->chnl.receive = chnl_recv_cb;
	388	priv->chnl.ctrlcmd = chnl_flowctrl_cb;
	389	priv->netdev = dev;
	390	priv->conn_req.protocol = CAIFPROTO_DATAGRAM;
	391	priv->conn_req.link_selector = CAIF_LINK_HIGH_BANDW;
	392	priv->conn_req.priority = CAIF_PRIO_LOW;
	393	/* Insert illegal value */
	394	priv->conn_req.sockaddr.u.dgm.connection_id = -1;
	395	priv->flowenabled = false;
	396
	397	ASSERT_RTNL();
	398	init_waitqueue_head(&priv->netmgmt_wq);
	399	list_add(&priv->list_field, &chnl_net_list);
	400	}
	401
	402
	403	static int ipcaif_fill_info(struct sk_buff skb, const struct net_device dev)
	404	{
	405	struct chnl_net *priv;
	406	u8 loop;
	407	priv = netdev_priv(dev);
	408	NLA_PUT_U32(skb, IFLA_CAIF_IPV4_CONNID,
	409	priv->conn_req.sockaddr.u.dgm.connection_id);
	410	NLA_PUT_U32(skb, IFLA_CAIF_IPV6_CONNID,
	411	priv->conn_req.sockaddr.u.dgm.connection_id);
	412	loop = priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP;
	413	NLA_PUT_U8(skb, IFLA_CAIF_LOOPBACK, loop);
	414
	415
	416	return 0;
	417	nla_put_failure:
	418	return -EMSGSIZE;
	419
	420	}
	421
	422	static void caif_netlink_parms(struct nlattr *data[],
	423	struct caif_connect_request *conn_req)
	424	{
	425	if (!data) {
b31fa5ba	426	pr_warn("no params data found\n");
cc36a070 SB	427	return;
	428	}
	429	if (data[IFLA_CAIF_IPV4_CONNID])
	430	conn_req->sockaddr.u.dgm.connection_id =
	431	nla_get_u32(data[IFLA_CAIF_IPV4_CONNID]);
	432	if (data[IFLA_CAIF_IPV6_CONNID])
	433	conn_req->sockaddr.u.dgm.connection_id =
	434	nla_get_u32(data[IFLA_CAIF_IPV6_CONNID]);
	435	if (data[IFLA_CAIF_LOOPBACK]) {
	436	if (nla_get_u8(data[IFLA_CAIF_LOOPBACK]))
	437	conn_req->protocol = CAIFPROTO_DATAGRAM_LOOP;
	438	else
	439	conn_req->protocol = CAIFPROTO_DATAGRAM;
	440	}
	441	}
	442
	443	static int ipcaif_newlink(struct net src_net, struct net_device dev,
	444	struct nlattr tb[], struct nlattr data[])
	445	{
	446	int ret;
	447	struct chnl_net *caifdev;
	448	ASSERT_RTNL();
	449	caifdev = netdev_priv(dev);
	450	caif_netlink_parms(data, &caifdev->conn_req);
8391c4aa SB	451	dev_net_set(caifdev->netdev, src_net);
8391c4aa SB	452
cc36a070 SB	453	ret = register_netdevice(dev);
cc36a070 SB	454	if (ret)
b31fa5ba	455	pr_warn("device rtml registration failed\n");
cc36a070 SB	456	return ret;
	457	}
	458
	459	static int ipcaif_changelink(struct net_device dev, struct nlattr tb[],
	460	struct nlattr *data[])
	461	{
	462	struct chnl_net *caifdev;
	463	ASSERT_RTNL();
	464	caifdev = netdev_priv(dev);
	465	caif_netlink_parms(data, &caifdev->conn_req);
	466	netdev_state_change(dev);
	467	return 0;
	468	}
	469
	470	static size_t ipcaif_get_size(const struct net_device *dev)
	471	{
	472	return
	473	/* IFLA_CAIF_IPV4_CONNID */
	474	nla_total_size(4) +
	475	/* IFLA_CAIF_IPV6_CONNID */
	476	nla_total_size(4) +
	477	/* IFLA_CAIF_LOOPBACK */
	478	nla_total_size(2) +
	479	0;
	480	}
	481
	482	static const struct nla_policy ipcaif_policy[IFLA_CAIF_MAX + 1] = {
	483	[IFLA_CAIF_IPV4_CONNID] = { .type = NLA_U32 },
	484	[IFLA_CAIF_IPV6_CONNID] = { .type = NLA_U32 },
	485	[IFLA_CAIF_LOOPBACK] = { .type = NLA_U8 }
	486	};
	487
	488
	489	static struct rtnl_link_ops ipcaif_link_ops __read_mostly = {
	490	.kind = "caif",
	491	.priv_size = sizeof(struct chnl_net),
	492	.setup = ipcaif_net_setup,
	493	.maxtype = IFLA_CAIF_MAX,
	494	.policy = ipcaif_policy,
	495	.newlink = ipcaif_newlink,
	496	.changelink = ipcaif_changelink,
	497	.get_size = ipcaif_get_size,
	498	.fill_info = ipcaif_fill_info,
	499
	500	};
	501
	502	static int __init chnl_init_module(void)
	503	{
	504	return rtnl_link_register(&ipcaif_link_ops);
	505	}
	506
	507	static void __exit chnl_exit_module(void)
	508	{
	509	struct chnl_net *dev = NULL;
	510	struct list_head *list_node;
	511	struct list_head *_tmp;
	512	rtnl_link_unregister(&ipcaif_link_ops);
	513	rtnl_lock();
	514	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
	515	dev = list_entry(list_node, struct chnl_net, list_field);
	516	list_del(list_node);
	517	delete_device(dev);
	518	}
	519	rtnl_unlock();
520	}
521
522	module_init(chnl_init_module);
523	module_exit(chnl_exit_module);