[linux-2.6-block.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 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);

	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;

	netif_rx(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 netdev_tx_t 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));
	INIT_LIST_HEAD(&priv->list_field);
	return 0;
}

static void chnl_net_uninit(struct net_device *dev)
{
	struct chnl_net *priv;
	ASSERT_RTNL();
	priv = netdev_priv(dev);
	list_del_init(&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_init(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	};
cc36a070 SB	55
cc36a070 SB	56	static int chnl_recv_cb(struct cflayer layr, struct cfpkt pkt)
	57	{
	58	struct sk_buff *skb;
af2ce213	59	struct chnl_net *priv;
cc36a070	60	int pktlen;
d7b92aff KS	61	const u8 *ip_version;
d7b92aff KS	62	u8 buf;
cc36a070 SB	63
cc36a070 SB	64	priv = container_of(layr, struct chnl_net, chnl);
cc36a070	65
3f874adc	66	skb = (struct sk_buff *) cfpkt_tonative(pkt);
3f874adc	67
cc36a070	68	/* Get length of CAIF packet. */
3f874adc	69	pktlen = skb->len;
cc36a070	70
cc36a070 SB	71	/* Pass some minimum information and
	72	* send the packet to the net stack.
	73	*/
	74	skb->dev = priv->netdev;
d7b92aff KS	75
	76	/* check the version of IP */
	77	ip_version = skb_header_pointer(skb, 0, 1, &buf);
d92c7f8a JJ	78	if (!ip_version) {
	79	kfree_skb(skb);
	80	return -EINVAL;
	81	}
576f3cc7	82
d7b92aff KS	83	switch (*ip_version >> 4) {
	84	case 4:
	85	skb->protocol = htons(ETH_P_IP);
	86	break;
	87	case 6:
	88	skb->protocol = htons(ETH_P_IPV6);
	89	break;
	90	default:
5c699fb7	91	kfree_skb(skb);
576f3cc7	92	priv->netdev->stats.rx_errors++;
d7b92aff KS	93	return -EINVAL;
d7b92aff KS	94	}
cc36a070 SB	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
3fb4430e	102	netif_rx(skb);
cc36a070 SB	103
	104	/* Update statistics. */
	105	priv->netdev->stats.rx_packets++;
	106	priv->netdev->stats.rx_bytes += pktlen;
	107
576f3cc7	108	return 0;
cc36a070 SB	109	}
	110
	111	static int delete_device(struct chnl_net *dev)
	112	{
	113	ASSERT_RTNL();
	114	if (dev->netdev)
	115	unregister_netdevice(dev->netdev);
	116	return 0;
	117	}
	118
	119	static void close_work(struct work_struct *work)
	120	{
	121	struct chnl_net *dev = NULL;
	122	struct list_head *list_node;
	123	struct list_head *_tmp;
41be5a4a	124
41be5a4a	125	rtnl_lock();
cc36a070 SB	126	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
cc36a070 SB	127	dev = list_entry(list_node, struct chnl_net, list_field);
8391c4aa SB	128	if (dev->state == CAIF_SHUTDOWN)
8391c4aa SB	129	dev_close(dev->netdev);
cc36a070	130	}
41be5a4a	131	rtnl_unlock();
cc36a070 SB	132	}
	133	static DECLARE_WORK(close_worker, close_work);
	134
b3ccfbe4	135	static void chnl_hold(struct cflayer *lyr)
	136	{
	137	struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
	138	dev_hold(priv->netdev);
	139	}
	140
	141	static void chnl_put(struct cflayer *lyr)
	142	{
	143	struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
	144	dev_put(priv->netdev);
	145	}
	146
cc36a070	147	static void chnl_flowctrl_cb(struct cflayer *layr, enum caif_ctrlcmd flow,
3bffc475	148	int phyid)
cc36a070	149	{
8391c4aa	150	struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
b31fa5ba	151	pr_debug("NET flowctrl func called flow: %s\n",
cc36a070 SB	152	flow == CAIF_CTRLCMD_FLOW_ON_IND ? "ON" :
	153	flow == CAIF_CTRLCMD_INIT_RSP ? "INIT" :
	154	flow == CAIF_CTRLCMD_FLOW_OFF_IND ? "OFF" :
	155	flow == CAIF_CTRLCMD_DEINIT_RSP ? "CLOSE/DEINIT" :
	156	flow == CAIF_CTRLCMD_INIT_FAIL_RSP ? "OPEN_FAIL" :
	157	flow == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND ?
5e84b38b	158	"REMOTE_SHUTDOWN" : "UNKNOWN CTRL COMMAND");
cc36a070	159
8391c4aa	160
cc36a070 SB	161
	162	switch (flow) {
	163	case CAIF_CTRLCMD_FLOW_OFF_IND:
8391c4aa SB	164	priv->flowenabled = false;
	165	netif_stop_queue(priv->netdev);
	166	break;
cc36a070	167	case CAIF_CTRLCMD_DEINIT_RSP:
8391c4aa SB	168	priv->state = CAIF_DISCONNECTED;
8391c4aa SB	169	break;
cc36a070	170	case CAIF_CTRLCMD_INIT_FAIL_RSP:
8391c4aa SB	171	priv->state = CAIF_DISCONNECTED;
	172	wake_up_interruptible(&priv->netmgmt_wq);
	173	break;
cc36a070	174	case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
8391c4aa	175	priv->state = CAIF_SHUTDOWN;
cc36a070	176	netif_tx_disable(priv->netdev);
cc36a070 SB	177	schedule_work(&close_worker);
	178	break;
	179	case CAIF_CTRLCMD_FLOW_ON_IND:
8391c4aa SB	180	priv->flowenabled = true;
	181	netif_wake_queue(priv->netdev);
	182	break;
cc36a070	183	case CAIF_CTRLCMD_INIT_RSP:
b3ccfbe4	184	caif_client_register_refcnt(&priv->chnl, chnl_hold, chnl_put);
8391c4aa	185	priv->state = CAIF_CONNECTED;
cc36a070 SB	186	priv->flowenabled = true;
	187	netif_wake_queue(priv->netdev);
	188	wake_up_interruptible(&priv->netmgmt_wq);
	189	break;
	190	default:
	191	break;
	192	}
	193	}
	194
99b2292b YW	195	static netdev_tx_t chnl_net_start_xmit(struct sk_buff *skb,
99b2292b YW	196	struct net_device *dev)
cc36a070 SB	197	{
	198	struct chnl_net *priv;
	199	struct cfpkt *pkt = NULL;
	200	int len;
	201	int result = -1;
	202	/* Get our private data. */
	203	priv = netdev_priv(dev);
	204
	205	if (skb->len > priv->netdev->mtu) {
b31fa5ba	206	pr_warn("Size of skb exceeded MTU\n");
5c699fb7	207	kfree_skb(skb);
576f3cc7	208	dev->stats.tx_errors++;
5c699fb7	209	return NETDEV_TX_OK;
cc36a070 SB	210	}
	211
	212	if (!priv->flowenabled) {
b31fa5ba	213	pr_debug("dropping packets flow off\n");
5c699fb7	214	kfree_skb(skb);
576f3cc7	215	dev->stats.tx_dropped++;
5c699fb7	216	return NETDEV_TX_OK;
cc36a070 SB	217	}
	218
	219	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
	220	swap(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
	221
	222	/* Store original SKB length. */
	223	len = skb->len;
	224
	225	pkt = cfpkt_fromnative(CAIF_DIR_OUT, (void *) skb);
	226
cc36a070 SB	227	/* Send the packet down the stack. */
	228	result = priv->chnl.dn->transmit(priv->chnl.dn, pkt);
	229	if (result) {
576f3cc7	230	dev->stats.tx_dropped++;
5c699fb7	231	return NETDEV_TX_OK;
cc36a070 SB	232	}
	233
	234	/* Update statistics. */
	235	dev->stats.tx_packets++;
	236	dev->stats.tx_bytes += len;
	237
	238	return NETDEV_TX_OK;
	239	}
	240
	241	static int chnl_net_open(struct net_device *dev)
	242	{
	243	struct chnl_net *priv = NULL;
	244	int result = -1;
2aa40aef SB	245	int llifindex, headroom, tailroom, mtu;
2aa40aef SB	246	struct net_device *lldev;
cc36a070	247	ASSERT_RTNL();
cc36a070	248	priv = netdev_priv(dev);
cc36a070	249	if (!priv) {
b31fa5ba	250	pr_debug("chnl_net_open: no priv\n");
cc36a070 SB	251	return -ENODEV;
cc36a070 SB	252	}
8391c4aa SB	253
	254	if (priv->state != CAIF_CONNECTING) {
	255	priv->state = CAIF_CONNECTING;
bee925db	256	result = caif_connect_client(dev_net(dev), &priv->conn_req,
	257	&priv->chnl, &llifindex,
	258	&headroom, &tailroom);
8391c4aa	259	if (result != 0) {
b31fa5ba JP	260	pr_debug("err: "
	261	"Unable to register and open device,"
	262	" Err:%d\n",
	263	result);
2aa40aef SB	264	goto error;
	265	}
	266
a74e9426	267	lldev = __dev_get_by_index(dev_net(dev), llifindex);
2aa40aef SB	268
2aa40aef SB	269	if (lldev == NULL) {
b31fa5ba	270	pr_debug("no interface?\n");
2aa40aef SB	271	result = -ENODEV;
	272	goto error;
	273	}
	274
	275	dev->needed_tailroom = tailroom + lldev->needed_tailroom;
	276	dev->hard_header_len = headroom + lldev->hard_header_len +
	277	lldev->needed_tailroom;
	278
	279	/*
	280	* MTU, head-room etc is not know before we have a
	281	* CAIF link layer device available. MTU calculation may
	282	* override initial RTNL configuration.
	283	* MTU is minimum of current mtu, link layer mtu pluss
	284	* CAIF head and tail, and PDP GPRS contexts max MTU.
	285	*/
	286	mtu = min_t(int, dev->mtu, lldev->mtu - (headroom + tailroom));
	287	mtu = min_t(int, GPRS_PDP_MTU, mtu);
	288	dev_set_mtu(dev, mtu);
2aa40aef SB	289
2aa40aef SB	290	if (mtu < 100) {
b31fa5ba	291	pr_warn("CAIF Interface MTU too small (%d)\n", mtu);
2aa40aef SB	292	result = -ENODEV;
2aa40aef SB	293	goto error;
8391c4aa	294	}
cc36a070	295	}
8391c4aa	296
2aa40aef SB	297	rtnl_unlock(); /* Release RTNL lock during connect wait */
2aa40aef SB	298
8391c4aa SB	299	result = wait_event_interruptible_timeout(priv->netmgmt_wq,
	300	priv->state != CAIF_CONNECTING,
	301	CONNECT_TIMEOUT);
cc36a070	302
2aa40aef SB	303	rtnl_lock();
2aa40aef SB	304
cc36a070	305	if (result == -ERESTARTSYS) {
b31fa5ba	306	pr_debug("wait_event_interruptible woken by a signal\n");
2aa40aef SB	307	result = -ERESTARTSYS;
2aa40aef SB	308	goto error;
8391c4aa	309	}
2aa40aef	310
8391c4aa	311	if (result == 0) {
b31fa5ba	312	pr_debug("connect timeout\n");
bee925db	313	caif_disconnect_client(dev_net(dev), &priv->chnl);
8391c4aa	314	priv->state = CAIF_DISCONNECTED;
b31fa5ba	315	pr_debug("state disconnected\n");
2aa40aef SB	316	result = -ETIMEDOUT;
2aa40aef SB	317	goto error;
8391c4aa	318	}
cc36a070	319
8391c4aa	320	if (priv->state != CAIF_CONNECTED) {
b31fa5ba	321	pr_debug("connect failed\n");
2aa40aef SB	322	result = -ECONNREFUSED;
2aa40aef SB	323	goto error;
8391c4aa	324	}
b31fa5ba	325	pr_debug("CAIF Netdevice connected\n");
cc36a070	326	return 0;
2aa40aef SB	327
2aa40aef SB	328	error:
bee925db	329	caif_disconnect_client(dev_net(dev), &priv->chnl);
2aa40aef	330	priv->state = CAIF_DISCONNECTED;
b31fa5ba	331	pr_debug("state disconnected\n");
2aa40aef SB	332	return result;
2aa40aef SB	333
cc36a070 SB	334	}
	335
	336	static int chnl_net_stop(struct net_device *dev)
	337	{
	338	struct chnl_net *priv;
8391c4aa	339
cc36a070 SB	340	ASSERT_RTNL();
cc36a070 SB	341	priv = netdev_priv(dev);
8391c4aa	342	priv->state = CAIF_DISCONNECTED;
bee925db	343	caif_disconnect_client(dev_net(dev), &priv->chnl);
cc36a070 SB	344	return 0;
	345	}
	346
	347	static int chnl_net_init(struct net_device *dev)
	348	{
	349	struct chnl_net *priv;
	350	ASSERT_RTNL();
	351	priv = netdev_priv(dev);
	352	strncpy(priv->name, dev->name, sizeof(priv->name));
550ac9c1	353	INIT_LIST_HEAD(&priv->list_field);
cc36a070 SB	354	return 0;
	355	}
	356
	357	static void chnl_net_uninit(struct net_device *dev)
	358	{
	359	struct chnl_net *priv;
	360	ASSERT_RTNL();
	361	priv = netdev_priv(dev);
550ac9c1	362	list_del_init(&priv->list_field);
cc36a070 SB	363	}
	364
	365	static const struct net_device_ops netdev_ops = {
	366	.ndo_open = chnl_net_open,
	367	.ndo_stop = chnl_net_stop,
	368	.ndo_init = chnl_net_init,
	369	.ndo_uninit = chnl_net_uninit,
	370	.ndo_start_xmit = chnl_net_start_xmit,
	371	};
	372
b3ccfbe4	373	static void chnl_net_destructor(struct net_device *dev)
	374	{
	375	struct chnl_net *priv = netdev_priv(dev);
	376	caif_free_client(&priv->chnl);
b3ccfbe4	377	}
b3ccfbe4	378
cc36a070 SB	379	static void ipcaif_net_setup(struct net_device *dev)
	380	{
	381	struct chnl_net *priv;
	382	dev->netdev_ops = &netdev_ops;
cf124db5 DM	383	dev->needs_free_netdev = true;
cf124db5 DM	384	dev->priv_destructor = chnl_net_destructor;
cc36a070 SB	385	dev->flags \|= IFF_NOARP;
cc36a070 SB	386	dev->flags \|= IFF_POINTOPOINT;
2aa40aef	387	dev->mtu = GPRS_PDP_MTU;
cc36a070 SB	388	dev->tx_queue_len = CAIF_NET_DEFAULT_QUEUE_LEN;
	389
	390	priv = netdev_priv(dev);
	391	priv->chnl.receive = chnl_recv_cb;
	392	priv->chnl.ctrlcmd = chnl_flowctrl_cb;
	393	priv->netdev = dev;
	394	priv->conn_req.protocol = CAIFPROTO_DATAGRAM;
	395	priv->conn_req.link_selector = CAIF_LINK_HIGH_BANDW;
	396	priv->conn_req.priority = CAIF_PRIO_LOW;
	397	/* Insert illegal value */
e3abcc2a	398	priv->conn_req.sockaddr.u.dgm.connection_id = UNDEF_CONNID;
cc36a070 SB	399	priv->flowenabled = false;
cc36a070 SB	400
cc36a070	401	init_waitqueue_head(&priv->netmgmt_wq);
cc36a070 SB	402	}
	403
	404
	405	static int ipcaif_fill_info(struct sk_buff skb, const struct net_device dev)
	406	{
	407	struct chnl_net *priv;
	408	u8 loop;
	409	priv = netdev_priv(dev);
2809cec5 DM	410	if (nla_put_u32(skb, IFLA_CAIF_IPV4_CONNID,
	411	priv->conn_req.sockaddr.u.dgm.connection_id) \|\|
	412	nla_put_u32(skb, IFLA_CAIF_IPV6_CONNID,
	413	priv->conn_req.sockaddr.u.dgm.connection_id))
	414	goto nla_put_failure;
cc36a070	415	loop = priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP;
2809cec5 DM	416	if (nla_put_u8(skb, IFLA_CAIF_LOOPBACK, loop))
2809cec5 DM	417	goto nla_put_failure;
cc36a070 SB	418	return 0;
	419	nla_put_failure:
	420	return -EMSGSIZE;
	421
	422	}
	423
	424	static void caif_netlink_parms(struct nlattr *data[],
3bffc475	425	struct caif_connect_request *conn_req)
cc36a070 SB	426	{
cc36a070 SB	427	if (!data) {
b31fa5ba	428	pr_warn("no params data found\n");
cc36a070 SB	429	return;
	430	}
	431	if (data[IFLA_CAIF_IPV4_CONNID])
	432	conn_req->sockaddr.u.dgm.connection_id =
	433	nla_get_u32(data[IFLA_CAIF_IPV4_CONNID]);
	434	if (data[IFLA_CAIF_IPV6_CONNID])
	435	conn_req->sockaddr.u.dgm.connection_id =
	436	nla_get_u32(data[IFLA_CAIF_IPV6_CONNID]);
	437	if (data[IFLA_CAIF_LOOPBACK]) {
	438	if (nla_get_u8(data[IFLA_CAIF_LOOPBACK]))
	439	conn_req->protocol = CAIFPROTO_DATAGRAM_LOOP;
	440	else
	441	conn_req->protocol = CAIFPROTO_DATAGRAM;
	442	}
	443	}
	444
	445	static int ipcaif_newlink(struct net src_net, struct net_device dev,
7a3f4a18 MS	446	struct nlattr tb[], struct nlattr data[],
7a3f4a18 MS	447	struct netlink_ext_ack *extack)
cc36a070 SB	448	{
	449	int ret;
	450	struct chnl_net *caifdev;
	451	ASSERT_RTNL();
	452	caifdev = netdev_priv(dev);
	453	caif_netlink_parms(data, &caifdev->conn_req);
8391c4aa	454
cc36a070 SB	455	ret = register_netdevice(dev);
cc36a070 SB	456	if (ret)
b31fa5ba	457	pr_warn("device rtml registration failed\n");
b2df5a84 DM	458	else
b2df5a84 DM	459	list_add(&caifdev->list_field, &chnl_net_list);
b3ccfbe4	460
e3abcc2a	461	/* Use ifindex as connection id, and use loopback channel default. */
e3abcc2a	462	if (caifdev->conn_req.sockaddr.u.dgm.connection_id == UNDEF_CONNID) {
b3ccfbe4	463	caifdev->conn_req.sockaddr.u.dgm.connection_id = dev->ifindex;
e3abcc2a	464	caifdev->conn_req.protocol = CAIFPROTO_DATAGRAM_LOOP;
e3abcc2a	465	}
cc36a070 SB	466	return ret;
	467	}
	468
	469	static int ipcaif_changelink(struct net_device dev, struct nlattr tb[],
ad744b22 MS	470	struct nlattr *data[],
ad744b22 MS	471	struct netlink_ext_ack *extack)
cc36a070 SB	472	{
	473	struct chnl_net *caifdev;
	474	ASSERT_RTNL();
	475	caifdev = netdev_priv(dev);
	476	caif_netlink_parms(data, &caifdev->conn_req);
	477	netdev_state_change(dev);
	478	return 0;
	479	}
	480
	481	static size_t ipcaif_get_size(const struct net_device *dev)
	482	{
	483	return
	484	/* IFLA_CAIF_IPV4_CONNID */
	485	nla_total_size(4) +
	486	/* IFLA_CAIF_IPV6_CONNID */
	487	nla_total_size(4) +
	488	/* IFLA_CAIF_LOOPBACK */
	489	nla_total_size(2) +
	490	0;
	491	}
	492
	493	static const struct nla_policy ipcaif_policy[IFLA_CAIF_MAX + 1] = {
	494	[IFLA_CAIF_IPV4_CONNID] = { .type = NLA_U32 },
	495	[IFLA_CAIF_IPV6_CONNID] = { .type = NLA_U32 },
	496	[IFLA_CAIF_LOOPBACK] = { .type = NLA_U8 }
	497	};
	498
	499
	500	static struct rtnl_link_ops ipcaif_link_ops __read_mostly = {
	501	.kind = "caif",
	502	.priv_size = sizeof(struct chnl_net),
	503	.setup = ipcaif_net_setup,
	504	.maxtype = IFLA_CAIF_MAX,
	505	.policy = ipcaif_policy,
	506	.newlink = ipcaif_newlink,
	507	.changelink = ipcaif_changelink,
	508	.get_size = ipcaif_get_size,
	509	.fill_info = ipcaif_fill_info,
	510
	511	};
	512
	513	static int __init chnl_init_module(void)
	514	{
	515	return rtnl_link_register(&ipcaif_link_ops);
	516	}
	517
	518	static void __exit chnl_exit_module(void)
	519	{
	520	struct chnl_net *dev = NULL;
	521	struct list_head *list_node;
	522	struct list_head *_tmp;
	523	rtnl_link_unregister(&ipcaif_link_ops);
	524	rtnl_lock();
	525	list_for_each_safe(list_node, _tmp, &chnl_net_list) {
	526	dev = list_entry(list_node, struct chnl_net, list_field);
550ac9c1	527	list_del_init(list_node);
cc36a070 SB	528	delete_device(dev);
	529	}
	530	rtnl_unlock();
	531	}
	532
	533	module_init(chnl_init_module);
	534	module_exit(chnl_exit_module);