[mirror_ubuntu-jammy-kernel.git] / net / caif / chnl_net.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) ST-Ericsson AB 2010
 * Authors:	Sjur Brendeland
 *		Daniel Martensson
 */

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

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

/* GPRS PDP connection has MTU to 1500 */
#define GPRS_PDP_MTU 1500
/* 5 sec. connect timeout */
#define CONNECT_TIMEOUT (5 * HZ)
#define CAIF_NET_DEFAULT_QUEUE_LEN 500
#define UNDEF_CONNID 0xffffffff

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

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

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

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

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

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

	priv = container_of(layr, struct chnl_net, chnl);
	if (!priv)
		return -EINVAL;

	skb = (struct sk_buff *) cfpkt_tonative(pkt);

	/* Get length of CAIF packet. */
	pktlen = skb->len;

	/* Pass some minimum information and
	 * send the packet to the net stack.
	 */
	skb->dev = priv->netdev;

	/* check the version of IP */
	ip_version = skb_header_pointer(skb, 0, 1, &buf);
	if (!ip_version) {
		kfree_skb(skb);
		return -EINVAL;
	}

	switch (*ip_version >> 4) {
	case 4:
		skb->protocol = htons(ETH_P_IP);
		break;
	case 6:
		skb->protocol = htons(ETH_P_IPV6);
		break;
	default:
		kfree_skb(skb);
		priv->netdev->stats.rx_errors++;
		return -EINVAL;
	}

	/* If we change the header in loop mode, the checksum is corrupted. */
	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
		skb->ip_summed = CHECKSUM_UNNECESSARY;
	else
		skb->ip_summed = CHECKSUM_NONE;

	if (in_interrupt())
		netif_rx(skb);
	else
		netif_rx_ni(skb);

	/* Update statistics. */
	priv->netdev->stats.rx_packets++;
	priv->netdev->stats.rx_bytes += pktlen;

	return 0;
}

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

static void close_work(struct work_struct *work)
{
	struct chnl_net *dev = NULL;
	struct list_head *list_node;
	struct list_head *_tmp;

	rtnl_lock();
	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
		dev = list_entry(list_node, struct chnl_net, list_field);
		if (dev->state == CAIF_SHUTDOWN)
			dev_close(dev->netdev);
	}
	rtnl_unlock();
}
static DECLARE_WORK(close_worker, close_work);

static void chnl_hold(struct cflayer *lyr)
{
	struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
	dev_hold(priv->netdev);
}

static void chnl_put(struct cflayer *lyr)
{
	struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
	dev_put(priv->netdev);
}

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


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

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

	if (skb->len > priv->netdev->mtu) {
		pr_warn("Size of skb exceeded MTU\n");
		kfree_skb(skb);
		dev->stats.tx_errors++;
		return NETDEV_TX_OK;
	}

	if (!priv->flowenabled) {
		pr_debug("dropping packets flow off\n");
		kfree_skb(skb);
		dev->stats.tx_dropped++;
		return NETDEV_TX_OK;
	}

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

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

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

	/* Send the packet down the stack. */
	result = priv->chnl.dn->transmit(priv->chnl.dn, pkt);
	if (result) {
		dev->stats.tx_dropped++;
		return NETDEV_TX_OK;
	}

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

	return NETDEV_TX_OK;
}

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

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

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

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

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

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

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

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

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

	rtnl_lock();

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

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

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

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

}

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

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

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

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

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

static void chnl_net_destructor(struct net_device *dev)
{
	struct chnl_net *priv = netdev_priv(dev);
	caif_free_client(&priv->chnl);
}

static void ipcaif_net_setup(struct net_device *dev)
{
	struct chnl_net *priv;
	dev->netdev_ops = &netdev_ops;
	dev->needs_free_netdev = true;
	dev->priv_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[],
			  struct netlink_ext_ack *extack)
{
	int ret;
	struct chnl_net *caifdev;
	ASSERT_RTNL();
	caifdev = netdev_priv(dev);
	caif_netlink_parms(data, &caifdev->conn_req);

	ret = register_netdevice(dev);
	if (ret)
		pr_warn("device rtml registration failed\n");
	else
		list_add(&caifdev->list_field, &chnl_net_list);

	/* Use ifindex as connection id, and use loopback channel default. */
	if (caifdev->conn_req.sockaddr.u.dgm.connection_id == UNDEF_CONNID) {
		caifdev->conn_req.sockaddr.u.dgm.connection_id = dev->ifindex;
		caifdev->conn_req.protocol = CAIFPROTO_DATAGRAM_LOOP;
	}
	return ret;
}

static int ipcaif_changelink(struct net_device *dev, struct nlattr *tb[],
			     struct nlattr *data[],
			     struct netlink_ext_ack *extack)
{
	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
af873fce	1	// SPDX-License-Identifier: GPL-2.0-only
cc36a070 SB	2	/*
cc36a070 SB	3	* Copyright (C) ST-Ericsson AB 2010
26ee65e6	4	* Authors: Sjur Brendeland
c2cd0a56	5	* Daniel Martensson
cc36a070 SB	6	*/
cc36a070 SB	7
b31fa5ba JP	8	#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
b31fa5ba JP	9
cc36a070 SB	10	#include <linux/fs.h>
	11	#include <linux/init.h>
	12	#include <linux/module.h>
	13	#include <linux/netdevice.h>
	14	#include <linux/if_ether.h>
cc36a070 SB	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>
cc36a070 SB	21	#include <net/caif/cfpkt.h>
	22	#include <net/caif/caif_dev.h>
	23
8391c4aa	24	/* GPRS PDP connection has MTU to 1500 */
2aa40aef	25	#define GPRS_PDP_MTU 1500
8391c4aa SB	26	/* 5 sec. connect timeout */
8391c4aa SB	27	#define CONNECT_TIMEOUT (5 * HZ)
cc36a070	28	#define CAIF_NET_DEFAULT_QUEUE_LEN 500
e3abcc2a	29	#define UNDEF_CONNID 0xffffffff
cc36a070	30
cc36a070 SB	31	/This list is protected by the rtnl lock. /
	32	static LIST_HEAD(chnl_net_list);
	33
	34	MODULE_LICENSE("GPL");
	35	MODULE_ALIAS_RTNL_LINK("caif");
	36
8391c4aa SB	37	enum caif_states {
	38	CAIF_CONNECTED = 1,
	39	CAIF_CONNECTING,
	40	CAIF_DISCONNECTED,
	41	CAIF_SHUTDOWN
	42	};
	43
cc36a070 SB	44	struct chnl_net {
cc36a070 SB	45	struct cflayer chnl;
cc36a070 SB	46	struct caif_connect_request conn_req;
	47	struct list_head list_field;
	48	struct net_device *netdev;
	49	char name[256];
	50	wait_queue_head_t netmgmt_wq;
	51	/* Flow status to remember and control the transmission. */
	52	bool flowenabled;
8391c4aa	53	enum caif_states state;
cc36a070 SB	54	};
	55
	56	static void robust_list_del(struct list_head *delete_node)
	57	{
	58	struct list_head *list_node;
	59	struct list_head *n;
	60	ASSERT_RTNL();
	61	list_for_each_safe(list_node, n, &chnl_net_list) {
	62	if (list_node == delete_node) {
	63	list_del(list_node);
8391c4aa	64	return;
cc36a070 SB	65	}
cc36a070 SB	66	}
8391c4aa	67	WARN_ON(1);
cc36a070 SB	68	}
	69
	70	static int chnl_recv_cb(struct cflayer layr, struct cfpkt pkt)
	71	{
	72	struct sk_buff *skb;
af2ce213	73	struct chnl_net *priv;
cc36a070	74	int pktlen;
d7b92aff KS	75	const u8 *ip_version;
d7b92aff KS	76	u8 buf;
cc36a070 SB	77
cc36a070 SB	78	priv = container_of(layr, struct chnl_net, chnl);
cc36a070 SB	79	if (!priv)
	80	return -EINVAL;
	81
3f874adc	82	skb = (struct sk_buff *) cfpkt_tonative(pkt);
3f874adc	83
cc36a070	84	/* Get length of CAIF packet. */
3f874adc	85	pktlen = skb->len;
cc36a070	86
cc36a070 SB	87	/* Pass some minimum information and
	88	* send the packet to the net stack.
	89	*/
	90	skb->dev = priv->netdev;
d7b92aff KS	91
	92	/* check the version of IP */
	93	ip_version = skb_header_pointer(skb, 0, 1, &buf);
d92c7f8a JJ	94	if (!ip_version) {
	95	kfree_skb(skb);
	96	return -EINVAL;
	97	}
576f3cc7	98
d7b92aff KS	99	switch (*ip_version >> 4) {
	100	case 4:
	101	skb->protocol = htons(ETH_P_IP);
	102	break;
	103	case 6:
	104	skb->protocol = htons(ETH_P_IPV6);
	105	break;
	106	default:
5c699fb7	107	kfree_skb(skb);
576f3cc7	108	priv->netdev->stats.rx_errors++;
d7b92aff KS	109	return -EINVAL;
d7b92aff KS	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
576f3cc7	127	return 0;
cc36a070 SB	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	166	static void chnl_flowctrl_cb(struct cflayer *layr, enum caif_ctrlcmd flow,
3bffc475	167	int phyid)
cc36a070	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 ?
5e84b38b	177	"REMOTE_SHUTDOWN" : "UNKNOWN CTRL COMMAND");
cc36a070	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");
5c699fb7	225	kfree_skb(skb);
576f3cc7	226	dev->stats.tx_errors++;
5c699fb7	227	return NETDEV_TX_OK;
cc36a070 SB	228	}
	229
	230	if (!priv->flowenabled) {
b31fa5ba	231	pr_debug("dropping packets flow off\n");
5c699fb7	232	kfree_skb(skb);
576f3cc7	233	dev->stats.tx_dropped++;
5c699fb7	234	return NETDEV_TX_OK;
cc36a070 SB	235	}
	236
	237	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
	238	swap(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
	239
	240	/* Store original SKB length. */
	241	len = skb->len;
	242
	243	pkt = cfpkt_fromnative(CAIF_DIR_OUT, (void *) skb);
	244
cc36a070 SB	245	/* Send the packet down the stack. */
	246	result = priv->chnl.dn->transmit(priv->chnl.dn, pkt);
	247	if (result) {
576f3cc7	248	dev->stats.tx_dropped++;
5c699fb7	249	return NETDEV_TX_OK;
cc36a070 SB	250	}
	251
	252	/* Update statistics. */
	253	dev->stats.tx_packets++;
	254	dev->stats.tx_bytes += len;
	255
	256	return NETDEV_TX_OK;
	257	}
	258
	259	static int chnl_net_open(struct net_device *dev)
	260	{
	261	struct chnl_net *priv = NULL;
	262	int result = -1;
2aa40aef SB	263	int llifindex, headroom, tailroom, mtu;
2aa40aef SB	264	struct net_device *lldev;
cc36a070	265	ASSERT_RTNL();
cc36a070	266	priv = netdev_priv(dev);
cc36a070	267	if (!priv) {
b31fa5ba	268	pr_debug("chnl_net_open: no priv\n");
cc36a070 SB	269	return -ENODEV;
cc36a070 SB	270	}
8391c4aa SB	271
	272	if (priv->state != CAIF_CONNECTING) {
	273	priv->state = CAIF_CONNECTING;
bee925db	274	result = caif_connect_client(dev_net(dev), &priv->conn_req,
	275	&priv->chnl, &llifindex,
	276	&headroom, &tailroom);
8391c4aa	277	if (result != 0) {
b31fa5ba JP	278	pr_debug("err: "
	279	"Unable to register and open device,"
	280	" Err:%d\n",
	281	result);
2aa40aef SB	282	goto error;
	283	}
	284
a74e9426	285	lldev = __dev_get_by_index(dev_net(dev), llifindex);
2aa40aef SB	286
2aa40aef SB	287	if (lldev == NULL) {
b31fa5ba	288	pr_debug("no interface?\n");
2aa40aef SB	289	result = -ENODEV;
	290	goto error;
	291	}
	292
	293	dev->needed_tailroom = tailroom + lldev->needed_tailroom;
	294	dev->hard_header_len = headroom + lldev->hard_header_len +
	295	lldev->needed_tailroom;
	296
	297	/*
	298	* MTU, head-room etc is not know before we have a
	299	* CAIF link layer device available. MTU calculation may
	300	* override initial RTNL configuration.
	301	* MTU is minimum of current mtu, link layer mtu pluss
	302	* CAIF head and tail, and PDP GPRS contexts max MTU.
	303	*/
	304	mtu = min_t(int, dev->mtu, lldev->mtu - (headroom + tailroom));
	305	mtu = min_t(int, GPRS_PDP_MTU, mtu);
	306	dev_set_mtu(dev, mtu);
2aa40aef SB	307
2aa40aef SB	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);
b3ccfbe4	394	}
b3ccfbe4	395
cc36a070 SB	396	static void ipcaif_net_setup(struct net_device *dev)
	397	{
	398	struct chnl_net *priv;
	399	dev->netdev_ops = &netdev_ops;
cf124db5 DM	400	dev->needs_free_netdev = true;
cf124db5 DM	401	dev->priv_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[],
3bffc475	442	struct caif_connect_request *conn_req)
cc36a070 SB	443	{
cc36a070 SB	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,
7a3f4a18 MS	463	struct nlattr tb[], struct nlattr data[],
7a3f4a18 MS	464	struct netlink_ext_ack *extack)
cc36a070 SB	465	{
	466	int ret;
	467	struct chnl_net *caifdev;
	468	ASSERT_RTNL();
	469	caifdev = netdev_priv(dev);
	470	caif_netlink_parms(data, &caifdev->conn_req);
8391c4aa	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[],
ad744b22 MS	487	struct nlattr *data[],
ad744b22 MS	488	struct netlink_ext_ack *extack)
cc36a070 SB	489	{
	490	struct chnl_net *caifdev;
	491	ASSERT_RTNL();
	492	caifdev = netdev_priv(dev);
	493	caif_netlink_parms(data, &caifdev->conn_req);
	494	netdev_state_change(dev);
	495	return 0;
	496	}
	497
	498	static size_t ipcaif_get_size(const struct net_device *dev)
	499	{
	500	return
	501	/* IFLA_CAIF_IPV4_CONNID */
	502	nla_total_size(4) +
	503	/* IFLA_CAIF_IPV6_CONNID */
	504	nla_total_size(4) +
	505	/* IFLA_CAIF_LOOPBACK */
	506	nla_total_size(2) +
	507	0;
	508	}
	509
	510	static const struct nla_policy ipcaif_policy[IFLA_CAIF_MAX + 1] = {
	511	[IFLA_CAIF_IPV4_CONNID] = { .type = NLA_U32 },
	512	[IFLA_CAIF_IPV6_CONNID] = { .type = NLA_U32 },
	513	[IFLA_CAIF_LOOPBACK] = { .type = NLA_U8 }
	514	};
	515
	516
	517	static struct rtnl_link_ops ipcaif_link_ops __read_mostly = {
	518	.kind = "caif",
	519	.priv_size = sizeof(struct chnl_net),
	520	.setup = ipcaif_net_setup,
	521	.maxtype = IFLA_CAIF_MAX,
	522	.policy = ipcaif_policy,
	523	.newlink = ipcaif_newlink,
	524	.changelink = ipcaif_changelink,
	525	.get_size = ipcaif_get_size,
	526	.fill_info = ipcaif_fill_info,
	527
	528	};
	529
	530	static int __init chnl_init_module(void)
	531	{
	532	return rtnl_link_register(&ipcaif_link_ops);
	533	}
	534
	535	static void __exit chnl_exit_module(void)
	536	{
	537	struct chnl_net *dev = NULL;
	538	struct list_head *list_node;
	539	struct list_head *_tmp;
	540	rtnl_link_unregister(&ipcaif_link_ops);
	541	rtnl_lock();
	542	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
	543	dev = list_entry(list_node, struct chnl_net, list_field);
	544	list_del(list_node);
	545	delete_device(dev);
	546	}
	547	rtnl_unlock();
	548	}
	549
	550	module_init(chnl_init_module);
	551	module_exit(chnl_exit_module);