[mirror_ubuntu-zesty-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/version.h>
#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

/*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;

	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)
		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;

	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");
		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(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 = 0;
	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);
	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");
	else
		list_add(&caifdev->list_field, &chnl_net_list);

	/* Take ifindex as connection-id if null */
	if (caifdev->conn_req.sockaddr.u.dgm.connection_id == 0)
		caifdev->conn_req.sockaddr.u.dgm.connection_id = dev->ifindex;
	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>
cc36a070 SB	11	#include <linux/fs.h>
a6b7a407	12	#include <linux/hardirq.h>
cc36a070 SB	13	#include <linux/init.h>
	14	#include <linux/module.h>
	15	#include <linux/netdevice.h>
	16	#include <linux/if_ether.h>
	17	#include <linux/moduleparam.h>
	18	#include <linux/ip.h>
	19	#include <linux/sched.h>
	20	#include <linux/sockios.h>
	21	#include <linux/caif/if_caif.h>
	22	#include <net/rtnetlink.h>
	23	#include <net/caif/caif_layer.h>
cc36a070 SB	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
3f874adc	87	skb = (struct sk_buff *) cfpkt_tonative(pkt);
3f874adc	88
cc36a070	89	/* Get length of CAIF packet. */
3f874adc	90	pktlen = skb->len;
cc36a070	91
cc36a070 SB	92	/* Pass some minimum information and
	93	* send the packet to the net stack.
	94	*/
	95	skb->dev = priv->netdev;
d7b92aff KS	96
	97	/* check the version of IP */
	98	ip_version = skb_header_pointer(skb, 0, 1, &buf);
	99	if (!ip_version)
	100	return -EINVAL;
	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:
	109	return -EINVAL;
	110	}
cc36a070 SB	111
	112	/* If we change the header in loop mode, the checksum is corrupted. */
	113	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
	114	skb->ip_summed = CHECKSUM_UNNECESSARY;
	115	else
	116	skb->ip_summed = CHECKSUM_NONE;
	117
cc36a070 SB	118	if (in_interrupt())
	119	netif_rx(skb);
	120	else
	121	netif_rx_ni(skb);
	122
	123	/* Update statistics. */
	124	priv->netdev->stats.rx_packets++;
	125	priv->netdev->stats.rx_bytes += pktlen;
	126
	127	return err;
	128	}
	129
	130	static int delete_device(struct chnl_net *dev)
	131	{
	132	ASSERT_RTNL();
	133	if (dev->netdev)
	134	unregister_netdevice(dev->netdev);
	135	return 0;
	136	}
	137
	138	static void close_work(struct work_struct *work)
	139	{
	140	struct chnl_net *dev = NULL;
	141	struct list_head *list_node;
	142	struct list_head *_tmp;
41be5a4a	143
41be5a4a	144	rtnl_lock();
cc36a070 SB	145	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
cc36a070 SB	146	dev = list_entry(list_node, struct chnl_net, list_field);
8391c4aa SB	147	if (dev->state == CAIF_SHUTDOWN)
8391c4aa SB	148	dev_close(dev->netdev);
cc36a070	149	}
41be5a4a	150	rtnl_unlock();
cc36a070 SB	151	}
	152	static DECLARE_WORK(close_worker, close_work);
	153
b3ccfbe4	154	static void chnl_hold(struct cflayer *lyr)
	155	{
	156	struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
	157	dev_hold(priv->netdev);
	158	}
	159
	160	static void chnl_put(struct cflayer *lyr)
	161	{
	162	struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
	163	dev_put(priv->netdev);
	164	}
	165
cc36a070 SB	166	static void chnl_flowctrl_cb(struct cflayer *layr, enum caif_ctrlcmd flow,
	167	int phyid)
	168	{
8391c4aa	169	struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
b31fa5ba	170	pr_debug("NET flowctrl func called flow: %s\n",
cc36a070 SB	171	flow == CAIF_CTRLCMD_FLOW_ON_IND ? "ON" :
	172	flow == CAIF_CTRLCMD_INIT_RSP ? "INIT" :
	173	flow == CAIF_CTRLCMD_FLOW_OFF_IND ? "OFF" :
	174	flow == CAIF_CTRLCMD_DEINIT_RSP ? "CLOSE/DEINIT" :
	175	flow == CAIF_CTRLCMD_INIT_FAIL_RSP ? "OPEN_FAIL" :
	176	flow == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND ?
	177	"REMOTE_SHUTDOWN" : "UKNOWN CTRL COMMAND");
	178
8391c4aa	179
cc36a070 SB	180
	181	switch (flow) {
	182	case CAIF_CTRLCMD_FLOW_OFF_IND:
8391c4aa SB	183	priv->flowenabled = false;
	184	netif_stop_queue(priv->netdev);
	185	break;
cc36a070	186	case CAIF_CTRLCMD_DEINIT_RSP:
8391c4aa SB	187	priv->state = CAIF_DISCONNECTED;
8391c4aa SB	188	break;
cc36a070	189	case CAIF_CTRLCMD_INIT_FAIL_RSP:
8391c4aa SB	190	priv->state = CAIF_DISCONNECTED;
	191	wake_up_interruptible(&priv->netmgmt_wq);
	192	break;
cc36a070	193	case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
8391c4aa	194	priv->state = CAIF_SHUTDOWN;
cc36a070	195	netif_tx_disable(priv->netdev);
cc36a070 SB	196	schedule_work(&close_worker);
	197	break;
	198	case CAIF_CTRLCMD_FLOW_ON_IND:
8391c4aa SB	199	priv->flowenabled = true;
	200	netif_wake_queue(priv->netdev);
	201	break;
cc36a070	202	case CAIF_CTRLCMD_INIT_RSP:
b3ccfbe4	203	caif_client_register_refcnt(&priv->chnl, chnl_hold, chnl_put);
8391c4aa	204	priv->state = CAIF_CONNECTED;
cc36a070 SB	205	priv->flowenabled = true;
	206	netif_wake_queue(priv->netdev);
	207	wake_up_interruptible(&priv->netmgmt_wq);
	208	break;
	209	default:
	210	break;
	211	}
	212	}
	213
	214	static int chnl_net_start_xmit(struct sk_buff skb, struct net_device dev)
	215	{
	216	struct chnl_net *priv;
	217	struct cfpkt *pkt = NULL;
	218	int len;
	219	int result = -1;
	220	/* Get our private data. */
	221	priv = netdev_priv(dev);
	222
	223	if (skb->len > priv->netdev->mtu) {
b31fa5ba	224	pr_warn("Size of skb exceeded MTU\n");
cc36a070 SB	225	return -ENOSPC;
	226	}
	227
	228	if (!priv->flowenabled) {
b31fa5ba	229	pr_debug("dropping packets flow off\n");
cc36a070 SB	230	return NETDEV_TX_BUSY;
	231	}
	232
	233	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
	234	swap(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
	235
	236	/* Store original SKB length. */
	237	len = skb->len;
	238
	239	pkt = cfpkt_fromnative(CAIF_DIR_OUT, (void *) skb);
	240
cc36a070 SB	241	/* Send the packet down the stack. */
	242	result = priv->chnl.dn->transmit(priv->chnl.dn, pkt);
	243	if (result) {
	244	if (result == -EAGAIN)
	245	result = NETDEV_TX_BUSY;
	246	return result;
	247	}
	248
	249	/* Update statistics. */
	250	dev->stats.tx_packets++;
	251	dev->stats.tx_bytes += len;
	252
	253	return NETDEV_TX_OK;
	254	}
	255
	256	static int chnl_net_open(struct net_device *dev)
	257	{
	258	struct chnl_net *priv = NULL;
	259	int result = -1;
2aa40aef SB	260	int llifindex, headroom, tailroom, mtu;
2aa40aef SB	261	struct net_device *lldev;
cc36a070	262	ASSERT_RTNL();
cc36a070	263	priv = netdev_priv(dev);
cc36a070	264	if (!priv) {
b31fa5ba	265	pr_debug("chnl_net_open: no priv\n");
cc36a070 SB	266	return -ENODEV;
cc36a070 SB	267	}
8391c4aa SB	268
	269	if (priv->state != CAIF_CONNECTING) {
	270	priv->state = CAIF_CONNECTING;
bee925db	271	result = caif_connect_client(dev_net(dev), &priv->conn_req,
	272	&priv->chnl, &llifindex,
	273	&headroom, &tailroom);
8391c4aa	274	if (result != 0) {
b31fa5ba JP	275	pr_debug("err: "
	276	"Unable to register and open device,"
	277	" Err:%d\n",
	278	result);
2aa40aef SB	279	goto error;
	280	}
	281
	282	lldev = dev_get_by_index(dev_net(dev), llifindex);
	283
	284	if (lldev == NULL) {
b31fa5ba	285	pr_debug("no interface?\n");
2aa40aef SB	286	result = -ENODEV;
	287	goto error;
	288	}
	289
	290	dev->needed_tailroom = tailroom + lldev->needed_tailroom;
	291	dev->hard_header_len = headroom + lldev->hard_header_len +
	292	lldev->needed_tailroom;
	293
	294	/*
	295	* MTU, head-room etc is not know before we have a
	296	* CAIF link layer device available. MTU calculation may
	297	* override initial RTNL configuration.
	298	* MTU is minimum of current mtu, link layer mtu pluss
	299	* CAIF head and tail, and PDP GPRS contexts max MTU.
	300	*/
	301	mtu = min_t(int, dev->mtu, lldev->mtu - (headroom + tailroom));
	302	mtu = min_t(int, GPRS_PDP_MTU, mtu);
	303	dev_set_mtu(dev, mtu);
	304	dev_put(lldev);
	305
	306	if (mtu < 100) {
b31fa5ba	307	pr_warn("CAIF Interface MTU too small (%d)\n", mtu);
2aa40aef SB	308	result = -ENODEV;
2aa40aef SB	309	goto error;
8391c4aa	310	}
cc36a070	311	}
8391c4aa	312
2aa40aef SB	313	rtnl_unlock(); /* Release RTNL lock during connect wait */
2aa40aef SB	314
8391c4aa SB	315	result = wait_event_interruptible_timeout(priv->netmgmt_wq,
	316	priv->state != CAIF_CONNECTING,
	317	CONNECT_TIMEOUT);
cc36a070	318
2aa40aef SB	319	rtnl_lock();
2aa40aef SB	320
cc36a070	321	if (result == -ERESTARTSYS) {
b31fa5ba	322	pr_debug("wait_event_interruptible woken by a signal\n");
2aa40aef SB	323	result = -ERESTARTSYS;
2aa40aef SB	324	goto error;
8391c4aa	325	}
2aa40aef	326
8391c4aa	327	if (result == 0) {
b31fa5ba	328	pr_debug("connect timeout\n");
bee925db	329	caif_disconnect_client(dev_net(dev), &priv->chnl);
8391c4aa	330	priv->state = CAIF_DISCONNECTED;
b31fa5ba	331	pr_debug("state disconnected\n");
2aa40aef SB	332	result = -ETIMEDOUT;
2aa40aef SB	333	goto error;
8391c4aa	334	}
cc36a070	335
8391c4aa	336	if (priv->state != CAIF_CONNECTED) {
b31fa5ba	337	pr_debug("connect failed\n");
2aa40aef SB	338	result = -ECONNREFUSED;
2aa40aef SB	339	goto error;
8391c4aa	340	}
b31fa5ba	341	pr_debug("CAIF Netdevice connected\n");
cc36a070	342	return 0;
2aa40aef SB	343
2aa40aef SB	344	error:
bee925db	345	caif_disconnect_client(dev_net(dev), &priv->chnl);
2aa40aef	346	priv->state = CAIF_DISCONNECTED;
b31fa5ba	347	pr_debug("state disconnected\n");
2aa40aef SB	348	return result;
2aa40aef SB	349
cc36a070 SB	350	}
	351
	352	static int chnl_net_stop(struct net_device *dev)
	353	{
	354	struct chnl_net *priv;
8391c4aa	355
cc36a070 SB	356	ASSERT_RTNL();
cc36a070 SB	357	priv = netdev_priv(dev);
8391c4aa	358	priv->state = CAIF_DISCONNECTED;
bee925db	359	caif_disconnect_client(dev_net(dev), &priv->chnl);
cc36a070 SB	360	return 0;
	361	}
	362
	363	static int chnl_net_init(struct net_device *dev)
	364	{
	365	struct chnl_net *priv;
	366	ASSERT_RTNL();
	367	priv = netdev_priv(dev);
	368	strncpy(priv->name, dev->name, sizeof(priv->name));
	369	return 0;
	370	}
	371
	372	static void chnl_net_uninit(struct net_device *dev)
	373	{
	374	struct chnl_net *priv;
	375	ASSERT_RTNL();
	376	priv = netdev_priv(dev);
	377	robust_list_del(&priv->list_field);
	378	}
	379
	380	static const struct net_device_ops netdev_ops = {
	381	.ndo_open = chnl_net_open,
	382	.ndo_stop = chnl_net_stop,
	383	.ndo_init = chnl_net_init,
	384	.ndo_uninit = chnl_net_uninit,
	385	.ndo_start_xmit = chnl_net_start_xmit,
	386	};
	387
b3ccfbe4	388	static void chnl_net_destructor(struct net_device *dev)
	389	{
	390	struct chnl_net *priv = netdev_priv(dev);
	391	caif_free_client(&priv->chnl);
	392	free_netdev(dev);
	393	}
	394
cc36a070 SB	395	static void ipcaif_net_setup(struct net_device *dev)
	396	{
	397	struct chnl_net *priv;
	398	dev->netdev_ops = &netdev_ops;
b3ccfbe4	399	dev->destructor = chnl_net_destructor;
cc36a070 SB	400	dev->flags \|= IFF_NOARP;
cc36a070 SB	401	dev->flags \|= IFF_POINTOPOINT;
2aa40aef	402	dev->mtu = GPRS_PDP_MTU;
cc36a070 SB	403	dev->tx_queue_len = CAIF_NET_DEFAULT_QUEUE_LEN;
	404
	405	priv = netdev_priv(dev);
	406	priv->chnl.receive = chnl_recv_cb;
	407	priv->chnl.ctrlcmd = chnl_flowctrl_cb;
	408	priv->netdev = dev;
	409	priv->conn_req.protocol = CAIFPROTO_DATAGRAM;
	410	priv->conn_req.link_selector = CAIF_LINK_HIGH_BANDW;
	411	priv->conn_req.priority = CAIF_PRIO_LOW;
	412	/* Insert illegal value */
b3ccfbe4	413	priv->conn_req.sockaddr.u.dgm.connection_id = 0;
cc36a070 SB	414	priv->flowenabled = false;
cc36a070 SB	415
cc36a070	416	init_waitqueue_head(&priv->netmgmt_wq);
cc36a070 SB	417	}
	418
	419
	420	static int ipcaif_fill_info(struct sk_buff skb, const struct net_device dev)
	421	{
	422	struct chnl_net *priv;
	423	u8 loop;
	424	priv = netdev_priv(dev);
	425	NLA_PUT_U32(skb, IFLA_CAIF_IPV4_CONNID,
	426	priv->conn_req.sockaddr.u.dgm.connection_id);
	427	NLA_PUT_U32(skb, IFLA_CAIF_IPV6_CONNID,
	428	priv->conn_req.sockaddr.u.dgm.connection_id);
	429	loop = priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP;
	430	NLA_PUT_U8(skb, IFLA_CAIF_LOOPBACK, loop);
	431
	432
	433	return 0;
	434	nla_put_failure:
	435	return -EMSGSIZE;
	436
	437	}
	438
	439	static void caif_netlink_parms(struct nlattr *data[],
	440	struct caif_connect_request *conn_req)
	441	{
	442	if (!data) {
b31fa5ba	443	pr_warn("no params data found\n");
cc36a070 SB	444	return;
	445	}
	446	if (data[IFLA_CAIF_IPV4_CONNID])
	447	conn_req->sockaddr.u.dgm.connection_id =
	448	nla_get_u32(data[IFLA_CAIF_IPV4_CONNID]);
	449	if (data[IFLA_CAIF_IPV6_CONNID])
	450	conn_req->sockaddr.u.dgm.connection_id =
	451	nla_get_u32(data[IFLA_CAIF_IPV6_CONNID]);
	452	if (data[IFLA_CAIF_LOOPBACK]) {
	453	if (nla_get_u8(data[IFLA_CAIF_LOOPBACK]))
	454	conn_req->protocol = CAIFPROTO_DATAGRAM_LOOP;
	455	else
	456	conn_req->protocol = CAIFPROTO_DATAGRAM;
	457	}
	458	}
	459
	460	static int ipcaif_newlink(struct net src_net, struct net_device dev,
	461	struct nlattr tb[], struct nlattr data[])
	462	{
	463	int ret;
	464	struct chnl_net *caifdev;
	465	ASSERT_RTNL();
	466	caifdev = netdev_priv(dev);
	467	caif_netlink_parms(data, &caifdev->conn_req);
8391c4aa SB	468	dev_net_set(caifdev->netdev, src_net);
8391c4aa SB	469
cc36a070 SB	470	ret = register_netdevice(dev);
cc36a070 SB	471	if (ret)
b31fa5ba	472	pr_warn("device rtml registration failed\n");
b2df5a84 DM	473	else
b2df5a84 DM	474	list_add(&caifdev->list_field, &chnl_net_list);
b3ccfbe4	475
	476	/* Take ifindex as connection-id if null */
	477	if (caifdev->conn_req.sockaddr.u.dgm.connection_id == 0)
	478	caifdev->conn_req.sockaddr.u.dgm.connection_id = dev->ifindex;
cc36a070 SB	479	return ret;
	480	}
	481
	482	static int ipcaif_changelink(struct net_device dev, struct nlattr tb[],
	483	struct nlattr *data[])
	484	{
	485	struct chnl_net *caifdev;
	486	ASSERT_RTNL();
	487	caifdev = netdev_priv(dev);
	488	caif_netlink_parms(data, &caifdev->conn_req);
	489	netdev_state_change(dev);
	490	return 0;
	491	}
	492
	493	static size_t ipcaif_get_size(const struct net_device *dev)
	494	{
	495	return
	496	/* IFLA_CAIF_IPV4_CONNID */
	497	nla_total_size(4) +
	498	/* IFLA_CAIF_IPV6_CONNID */
	499	nla_total_size(4) +
	500	/* IFLA_CAIF_LOOPBACK */
	501	nla_total_size(2) +
	502	0;
	503	}
	504
	505	static const struct nla_policy ipcaif_policy[IFLA_CAIF_MAX + 1] = {
	506	[IFLA_CAIF_IPV4_CONNID] = { .type = NLA_U32 },
	507	[IFLA_CAIF_IPV6_CONNID] = { .type = NLA_U32 },
	508	[IFLA_CAIF_LOOPBACK] = { .type = NLA_U8 }
	509	};
	510
	511
	512	static struct rtnl_link_ops ipcaif_link_ops __read_mostly = {
	513	.kind = "caif",
	514	.priv_size = sizeof(struct chnl_net),
	515	.setup = ipcaif_net_setup,
	516	.maxtype = IFLA_CAIF_MAX,
	517	.policy = ipcaif_policy,
	518	.newlink = ipcaif_newlink,
	519	.changelink = ipcaif_changelink,
	520	.get_size = ipcaif_get_size,
	521	.fill_info = ipcaif_fill_info,
	522
	523	};
	524
	525	static int __init chnl_init_module(void)
	526	{
	527	return rtnl_link_register(&ipcaif_link_ops);
	528	}
	529
	530	static void __exit chnl_exit_module(void)
	531	{
	532	struct chnl_net *dev = NULL;
	533	struct list_head *list_node;
	534	struct list_head *_tmp;
	535	rtnl_link_unregister(&ipcaif_link_ops);
	536	rtnl_lock();
	537	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
	538	dev = list_entry(list_node, struct chnl_net, list_field);
	539	list_del(list_node);
	540	delete_device(dev);
	541	}
	542	rtnl_unlock();
543	}
544
545	module_init(chnl_init_module);
546	module_exit(chnl_exit_module);