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From: Alexander Aring <aar@pengutronix.de>
To: linux-wpan@vger.kernel.org
Cc: kernel@pengutronix.de, linux-bluetooth@vger.kernel.org,
	Alexander Aring <aar@pengutronix.de>
Subject: [RFCv2 bluetooth-next 11/19] 6lowpan: bluetooth: remove implementation
Date: Sun,  7 Aug 2016 16:30:48 +0200	[thread overview]
Message-ID: <20160807143056.3116-12-aar@pengutronix.de> (raw)
In-Reply-To: <20160807143056.3116-1-aar@pengutronix.de>

This patch prepares for a new bluetooth implementation which supports
correct ndisc handling and solves some races. The get the correct ndisc
handling it's better to remove the whole implementation while
implementing this handling in different layers.

Signed-off-by: Alexander Aring <aar@pengutronix.de>
---
 net/bluetooth/6lowpan.c | 1413 -----------------------------------------------
 net/bluetooth/Makefile  |    3 -
 2 files changed, 1416 deletions(-)
 delete mode 100644 net/bluetooth/6lowpan.c

diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
deleted file mode 100644
index d020299..0000000
--- a/net/bluetooth/6lowpan.c
+++ /dev/null
@@ -1,1413 +0,0 @@
-/*
-   Copyright (c) 2013-2014 Intel Corp.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License version 2 and
-   only version 2 as published by the Free Software Foundation.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-*/
-
-#include <linux/if_arp.h>
-#include <linux/netdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/module.h>
-#include <linux/debugfs.h>
-
-#include <net/ipv6.h>
-#include <net/ip6_route.h>
-#include <net/addrconf.h>
-
-#include <net/bluetooth/bluetooth.h>
-#include <net/bluetooth/hci_core.h>
-#include <net/bluetooth/l2cap.h>
-
-#include <net/6lowpan.h> /* for the compression support */
-
-#define VERSION "0.1"
-
-static struct dentry *lowpan_enable_debugfs;
-static struct dentry *lowpan_control_debugfs;
-
-#define IFACE_NAME_TEMPLATE "bt%d"
-
-struct skb_cb {
-	struct in6_addr addr;
-	struct in6_addr gw;
-	struct l2cap_chan *chan;
-	int status;
-};
-#define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb))
-
-/* The devices list contains those devices that we are acting
- * as a proxy. The BT 6LoWPAN device is a virtual device that
- * connects to the Bluetooth LE device. The real connection to
- * BT device is done via l2cap layer. There exists one
- * virtual device / one BT 6LoWPAN network (=hciX device).
- * The list contains struct lowpan_dev elements.
- */
-static LIST_HEAD(bt_6lowpan_devices);
-static DEFINE_SPINLOCK(devices_lock);
-
-static bool enable_6lowpan;
-
-/* We are listening incoming connections via this channel
- */
-static struct l2cap_chan *listen_chan;
-
-struct lowpan_peer {
-	struct list_head list;
-	struct rcu_head rcu;
-	struct l2cap_chan *chan;
-
-	/* peer addresses in various formats */
-	unsigned char eui64_addr[EUI64_ADDR_LEN];
-	struct in6_addr peer_addr;
-};
-
-struct lowpan_btle_dev {
-	struct list_head list;
-
-	struct hci_dev *hdev;
-	struct net_device *netdev;
-	struct list_head peers;
-	atomic_t peer_count; /* number of items in peers list */
-
-	struct work_struct delete_netdev;
-	struct delayed_work notify_peers;
-};
-
-static inline struct lowpan_btle_dev *
-lowpan_btle_dev(const struct net_device *netdev)
-{
-	return (struct lowpan_btle_dev *)lowpan_dev(netdev)->priv;
-}
-
-static inline void peer_add(struct lowpan_btle_dev *dev,
-			    struct lowpan_peer *peer)
-{
-	list_add_rcu(&peer->list, &dev->peers);
-	atomic_inc(&dev->peer_count);
-}
-
-static inline bool peer_del(struct lowpan_btle_dev *dev,
-			    struct lowpan_peer *peer)
-{
-	list_del_rcu(&peer->list);
-	kfree_rcu(peer, rcu);
-
-	module_put(THIS_MODULE);
-
-	if (atomic_dec_and_test(&dev->peer_count)) {
-		BT_DBG("last peer");
-		return true;
-	}
-
-	return false;
-}
-
-static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_btle_dev *dev,
-						 bdaddr_t *ba, __u8 type)
-{
-	struct lowpan_peer *peer;
-
-	BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count),
-	       ba, type);
-
-	rcu_read_lock();
-
-	list_for_each_entry_rcu(peer, &dev->peers, list) {
-		BT_DBG("dst addr %pMR dst type %d",
-		       &peer->chan->dst, peer->chan->dst_type);
-
-		if (bacmp(&peer->chan->dst, ba))
-			continue;
-
-		if (type == peer->chan->dst_type) {
-			rcu_read_unlock();
-			return peer;
-		}
-	}
-
-	rcu_read_unlock();
-
-	return NULL;
-}
-
-static inline struct lowpan_peer *
-__peer_lookup_chan(struct lowpan_btle_dev *dev, struct l2cap_chan *chan)
-{
-	struct lowpan_peer *peer;
-
-	list_for_each_entry_rcu(peer, &dev->peers, list) {
-		if (peer->chan == chan)
-			return peer;
-	}
-
-	return NULL;
-}
-
-static inline struct lowpan_peer *
-__peer_lookup_conn(struct lowpan_btle_dev *dev, struct l2cap_conn *conn)
-{
-	struct lowpan_peer *peer;
-
-	list_for_each_entry_rcu(peer, &dev->peers, list) {
-		if (peer->chan->conn == conn)
-			return peer;
-	}
-
-	return NULL;
-}
-
-static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_btle_dev *dev,
-						  struct in6_addr *daddr,
-						  struct sk_buff *skb)
-{
-	struct lowpan_peer *peer;
-	struct in6_addr *nexthop;
-	struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
-	int count = atomic_read(&dev->peer_count);
-
-	BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt);
-
-	/* If we have multiple 6lowpan peers, then check where we should
-	 * send the packet. If only one peer exists, then we can send the
-	 * packet right away.
-	 */
-	if (count == 1) {
-		rcu_read_lock();
-		peer = list_first_or_null_rcu(&dev->peers, struct lowpan_peer,
-					      list);
-		rcu_read_unlock();
-		return peer;
-	}
-
-	if (!rt) {
-		nexthop = &lowpan_cb(skb)->gw;
-
-		if (ipv6_addr_any(nexthop))
-			return NULL;
-	} else {
-		nexthop = rt6_nexthop(rt, daddr);
-
-		/* We need to remember the address because it is needed
-		 * by bt_xmit() when sending the packet. In bt_xmit(), the
-		 * destination routing info is not set.
-		 */
-		memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr));
-	}
-
-	BT_DBG("gw %pI6c", nexthop);
-
-	rcu_read_lock();
-
-	list_for_each_entry_rcu(peer, &dev->peers, list) {
-		BT_DBG("dst addr %pMR dst type %d ip %pI6c",
-		       &peer->chan->dst, peer->chan->dst_type,
-		       &peer->peer_addr);
-
-		if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) {
-			rcu_read_unlock();
-			return peer;
-		}
-	}
-
-	rcu_read_unlock();
-
-	return NULL;
-}
-
-static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
-{
-	struct lowpan_btle_dev *entry;
-	struct lowpan_peer *peer = NULL;
-
-	rcu_read_lock();
-
-	list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
-		peer = __peer_lookup_conn(entry, conn);
-		if (peer)
-			break;
-	}
-
-	rcu_read_unlock();
-
-	return peer;
-}
-
-static struct lowpan_btle_dev *lookup_dev(struct l2cap_conn *conn)
-{
-	struct lowpan_btle_dev *entry;
-	struct lowpan_btle_dev *dev = NULL;
-
-	rcu_read_lock();
-
-	list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
-		if (conn->hcon->hdev == entry->hdev) {
-			dev = entry;
-			break;
-		}
-	}
-
-	rcu_read_unlock();
-
-	return dev;
-}
-
-static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
-{
-	struct sk_buff *skb_cp;
-
-	skb_cp = skb_copy(skb, GFP_ATOMIC);
-	if (!skb_cp)
-		return NET_RX_DROP;
-
-	return netif_rx_ni(skb_cp);
-}
-
-static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
-			   struct l2cap_chan *chan)
-{
-	const u8 *saddr, *daddr;
-	struct lowpan_btle_dev *dev;
-	struct lowpan_peer *peer;
-
-	dev = lowpan_btle_dev(netdev);
-
-	rcu_read_lock();
-	peer = __peer_lookup_chan(dev, chan);
-	rcu_read_unlock();
-	if (!peer)
-		return -EINVAL;
-
-	saddr = peer->eui64_addr;
-	daddr = dev->netdev->dev_addr;
-
-	return lowpan_header_decompress(skb, netdev, daddr, saddr);
-}
-
-static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
-		    struct l2cap_chan *chan)
-{
-	struct sk_buff *local_skb;
-	int ret;
-
-	if (!netif_running(dev))
-		goto drop;
-
-	if (dev->type != ARPHRD_6LOWPAN || !skb->len)
-		goto drop;
-
-	skb_reset_network_header(skb);
-
-	skb = skb_share_check(skb, GFP_ATOMIC);
-	if (!skb)
-		goto drop;
-
-	/* check that it's our buffer */
-	if (lowpan_is_ipv6(*skb_network_header(skb))) {
-		/* Pull off the 1-byte of 6lowpan header. */
-		skb_pull(skb, 1);
-
-		/* Copy the packet so that the IPv6 header is
-		 * properly aligned.
-		 */
-		local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
-					    skb_tailroom(skb), GFP_ATOMIC);
-		if (!local_skb)
-			goto drop;
-
-		local_skb->protocol = htons(ETH_P_IPV6);
-		local_skb->pkt_type = PACKET_HOST;
-		local_skb->dev = dev;
-
-		skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
-
-		if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
-			kfree_skb(local_skb);
-			goto drop;
-		}
-
-		dev->stats.rx_bytes += skb->len;
-		dev->stats.rx_packets++;
-
-		consume_skb(local_skb);
-		consume_skb(skb);
-	} else if (lowpan_is_iphc(*skb_network_header(skb))) {
-		local_skb = skb_clone(skb, GFP_ATOMIC);
-		if (!local_skb)
-			goto drop;
-
-		local_skb->dev = dev;
-
-		ret = iphc_decompress(local_skb, dev, chan);
-		if (ret < 0) {
-			kfree_skb(local_skb);
-			goto drop;
-		}
-
-		local_skb->protocol = htons(ETH_P_IPV6);
-		local_skb->pkt_type = PACKET_HOST;
-
-		if (give_skb_to_upper(local_skb, dev)
-				!= NET_RX_SUCCESS) {
-			kfree_skb(local_skb);
-			goto drop;
-		}
-
-		dev->stats.rx_bytes += skb->len;
-		dev->stats.rx_packets++;
-
-		consume_skb(local_skb);
-		consume_skb(skb);
-	} else {
-		goto drop;
-	}
-
-	return NET_RX_SUCCESS;
-
-drop:
-	dev->stats.rx_dropped++;
-	return NET_RX_DROP;
-}
-
-/* Packet from BT LE device */
-static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
-{
-	struct lowpan_btle_dev *dev;
-	struct lowpan_peer *peer;
-	int err;
-
-	peer = lookup_peer(chan->conn);
-	if (!peer)
-		return -ENOENT;
-
-	dev = lookup_dev(chan->conn);
-	if (!dev || !dev->netdev)
-		return -ENOENT;
-
-	err = recv_pkt(skb, dev->netdev, chan);
-	if (err) {
-		BT_DBG("recv pkt %d", err);
-		err = -EAGAIN;
-	}
-
-	return err;
-}
-
-static u8 get_addr_type_from_eui64(u8 byte)
-{
-	/* Is universal(0) or local(1) bit */
-	return ((byte & 0x02) ? BDADDR_LE_RANDOM : BDADDR_LE_PUBLIC);
-}
-
-static void copy_to_bdaddr(struct in6_addr *ip6_daddr, bdaddr_t *addr)
-{
-	u8 *eui64 = ip6_daddr->s6_addr + 8;
-
-	addr->b[0] = eui64[7];
-	addr->b[1] = eui64[6];
-	addr->b[2] = eui64[5];
-	addr->b[3] = eui64[2];
-	addr->b[4] = eui64[1];
-	addr->b[5] = eui64[0];
-}
-
-static void convert_dest_bdaddr(struct in6_addr *ip6_daddr,
-				bdaddr_t *addr, u8 *addr_type)
-{
-	copy_to_bdaddr(ip6_daddr, addr);
-
-	/* We need to toggle the U/L bit that we got from IPv6 address
-	 * so that we get the proper address and type of the BD address.
-	 */
-	addr->b[5] ^= 0x02;
-
-	*addr_type = get_addr_type_from_eui64(addr->b[5]);
-}
-
-static int setup_header(struct sk_buff *skb, struct net_device *netdev,
-			bdaddr_t *peer_addr, u8 *peer_addr_type)
-{
-	struct in6_addr ipv6_daddr;
-	struct ipv6hdr *hdr;
-	struct lowpan_btle_dev *dev;
-	struct lowpan_peer *peer;
-	bdaddr_t addr, *any = BDADDR_ANY;
-	u8 *daddr = any->b;
-	int err, status = 0;
-
-	hdr = ipv6_hdr(skb);
-
-	dev = lowpan_btle_dev(netdev);
-
-	memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr));
-
-	if (ipv6_addr_is_multicast(&ipv6_daddr)) {
-		lowpan_cb(skb)->chan = NULL;
-	} else {
-		u8 addr_type;
-
-		/* Get destination BT device from skb.
-		 * If there is no such peer then discard the packet.
-		 */
-		convert_dest_bdaddr(&ipv6_daddr, &addr, &addr_type);
-
-		BT_DBG("dest addr %pMR type %d IP %pI6c", &addr,
-		       addr_type, &ipv6_daddr);
-
-		peer = peer_lookup_ba(dev, &addr, addr_type);
-		if (!peer) {
-			/* The packet might be sent to 6lowpan interface
-			 * because of routing (either via default route
-			 * or user set route) so get peer according to
-			 * the destination address.
-			 */
-			peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
-			if (!peer) {
-				BT_DBG("no such peer %pMR found", &addr);
-				return -ENOENT;
-			}
-		}
-
-		daddr = peer->eui64_addr;
-		*peer_addr = addr;
-		*peer_addr_type = addr_type;
-		lowpan_cb(skb)->chan = peer->chan;
-
-		status = 1;
-	}
-
-	lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr);
-
-	err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0);
-	if (err < 0)
-		return err;
-
-	return status;
-}
-
-static int header_create(struct sk_buff *skb, struct net_device *netdev,
-			 unsigned short type, const void *_daddr,
-			 const void *_saddr, unsigned int len)
-{
-	if (type != ETH_P_IPV6)
-		return -EINVAL;
-
-	return 0;
-}
-
-/* Packet to BT LE device */
-static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
-		    struct net_device *netdev)
-{
-	struct msghdr msg;
-	struct kvec iv;
-	int err;
-
-	/* Remember the skb so that we can send EAGAIN to the caller if
-	 * we run out of credits.
-	 */
-	chan->data = skb;
-
-	iv.iov_base = skb->data;
-	iv.iov_len = skb->len;
-
-	memset(&msg, 0, sizeof(msg));
-	iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, skb->len);
-
-	err = l2cap_chan_send(chan, &msg, skb->len);
-	if (err > 0) {
-		netdev->stats.tx_bytes += err;
-		netdev->stats.tx_packets++;
-		return 0;
-	}
-
-	if (!err)
-		err = lowpan_cb(skb)->status;
-
-	if (err < 0) {
-		if (err == -EAGAIN)
-			netdev->stats.tx_dropped++;
-		else
-			netdev->stats.tx_errors++;
-	}
-
-	return err;
-}
-
-static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
-{
-	struct sk_buff *local_skb;
-	struct lowpan_btle_dev *entry;
-	int err = 0;
-
-	rcu_read_lock();
-
-	list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
-		struct lowpan_peer *pentry;
-		struct lowpan_btle_dev *dev;
-
-		if (entry->netdev != netdev)
-			continue;
-
-		dev = lowpan_btle_dev(entry->netdev);
-
-		list_for_each_entry_rcu(pentry, &dev->peers, list) {
-			int ret;
-
-			local_skb = skb_clone(skb, GFP_ATOMIC);
-
-			BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
-			       netdev->name,
-			       &pentry->chan->dst, pentry->chan->dst_type,
-			       &pentry->peer_addr, pentry->chan);
-			ret = send_pkt(pentry->chan, local_skb, netdev);
-			if (ret < 0)
-				err = ret;
-
-			kfree_skb(local_skb);
-		}
-	}
-
-	rcu_read_unlock();
-
-	return err;
-}
-
-static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
-{
-	int err = 0;
-	bdaddr_t addr;
-	u8 addr_type;
-
-	/* We must take a copy of the skb before we modify/replace the ipv6
-	 * header as the header could be used elsewhere
-	 */
-	skb = skb_unshare(skb, GFP_ATOMIC);
-	if (!skb)
-		return NET_XMIT_DROP;
-
-	/* Return values from setup_header()
-	 *  <0 - error, packet is dropped
-	 *   0 - this is a multicast packet
-	 *   1 - this is unicast packet
-	 */
-	err = setup_header(skb, netdev, &addr, &addr_type);
-	if (err < 0) {
-		kfree_skb(skb);
-		return NET_XMIT_DROP;
-	}
-
-	if (err) {
-		if (lowpan_cb(skb)->chan) {
-			BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
-			       netdev->name, &addr, addr_type,
-			       &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan);
-			err = send_pkt(lowpan_cb(skb)->chan, skb, netdev);
-		} else {
-			err = -ENOENT;
-		}
-	} else {
-		/* We need to send the packet to every device behind this
-		 * interface.
-		 */
-		err = send_mcast_pkt(skb, netdev);
-	}
-
-	dev_kfree_skb(skb);
-
-	if (err)
-		BT_DBG("ERROR: xmit failed (%d)", err);
-
-	return err < 0 ? NET_XMIT_DROP : err;
-}
-
-static int bt_dev_init(struct net_device *dev)
-{
-	netdev_lockdep_set_classes(dev);
-
-	return 0;
-}
-
-static const struct net_device_ops netdev_ops = {
-	.ndo_init		= bt_dev_init,
-	.ndo_start_xmit		= bt_xmit,
-};
-
-static struct header_ops header_ops = {
-	.create	= header_create,
-};
-
-static void netdev_setup(struct net_device *dev)
-{
-	dev->hard_header_len	= 0;
-	dev->needed_tailroom	= 0;
-	dev->flags		= IFF_RUNNING | IFF_POINTOPOINT |
-				  IFF_MULTICAST;
-	dev->watchdog_timeo	= 0;
-
-	dev->netdev_ops		= &netdev_ops;
-	dev->header_ops		= &header_ops;
-	dev->destructor		= free_netdev;
-}
-
-static struct device_type bt_type = {
-	.name	= "bluetooth",
-};
-
-static void set_addr(u8 *eui, u8 *addr, u8 addr_type)
-{
-	/* addr is the BT address in little-endian format */
-	eui[0] = addr[5];
-	eui[1] = addr[4];
-	eui[2] = addr[3];
-	eui[3] = 0xFF;
-	eui[4] = 0xFE;
-	eui[5] = addr[2];
-	eui[6] = addr[1];
-	eui[7] = addr[0];
-
-	/* Universal/local bit set, BT 6lowpan draft ch. 3.2.1 */
-	if (addr_type == BDADDR_LE_PUBLIC)
-		eui[0] &= ~0x02;
-	else
-		eui[0] |= 0x02;
-
-	BT_DBG("type %d addr %*phC", addr_type, 8, eui);
-}
-
-static void set_dev_addr(struct net_device *netdev, bdaddr_t *addr,
-		         u8 addr_type)
-{
-	netdev->addr_assign_type = NET_ADDR_PERM;
-	set_addr(netdev->dev_addr, addr->b, addr_type);
-}
-
-static void ifup(struct net_device *netdev)
-{
-	int err;
-
-	rtnl_lock();
-	err = dev_open(netdev);
-	if (err < 0)
-		BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
-	rtnl_unlock();
-}
-
-static void ifdown(struct net_device *netdev)
-{
-	int err;
-
-	rtnl_lock();
-	err = dev_close(netdev);
-	if (err < 0)
-		BT_INFO("iface %s cannot be closed (%d)", netdev->name, err);
-	rtnl_unlock();
-}
-
-static void do_notify_peers(struct work_struct *work)
-{
-	struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_dev,
-						   notify_peers.work);
-
-	netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */
-}
-
-static bool is_bt_6lowpan(struct hci_conn *hcon)
-{
-	if (hcon->type != LE_LINK)
-		return false;
-
-	if (!enable_6lowpan)
-		return false;
-
-	return true;
-}
-
-static struct l2cap_chan *chan_create(void)
-{
-	struct l2cap_chan *chan;
-
-	chan = l2cap_chan_create();
-	if (!chan)
-		return NULL;
-
-	l2cap_chan_set_defaults(chan);
-
-	chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
-	chan->mode = L2CAP_MODE_LE_FLOWCTL;
-	chan->imtu = 1280;
-
-	return chan;
-}
-
-static void set_ip_addr_bits(u8 addr_type, u8 *addr)
-{
-	if (addr_type == BDADDR_LE_PUBLIC)
-		*addr |= 0x02;
-	else
-		*addr &= ~0x02;
-}
-
-static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
-					struct lowpan_btle_dev *dev)
-{
-	struct lowpan_peer *peer;
-
-	peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
-	if (!peer)
-		return NULL;
-
-	peer->chan = chan;
-	memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
-
-	/* RFC 2464 ch. 5 */
-	peer->peer_addr.s6_addr[0] = 0xFE;
-	peer->peer_addr.s6_addr[1] = 0x80;
-	set_addr((u8 *)&peer->peer_addr.s6_addr + 8, chan->dst.b,
-		 chan->dst_type);
-
-	memcpy(&peer->eui64_addr, (u8 *)&peer->peer_addr.s6_addr + 8,
-	       EUI64_ADDR_LEN);
-
-	/* IPv6 address needs to have the U/L bit set properly so toggle
-	 * it back here.
-	 */
-	set_ip_addr_bits(chan->dst_type, (u8 *)&peer->peer_addr.s6_addr + 8);
-
-	spin_lock(&devices_lock);
-	INIT_LIST_HEAD(&peer->list);
-	peer_add(dev, peer);
-	spin_unlock(&devices_lock);
-
-	/* Notifying peers about us needs to be done without locks held */
-	INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
-	schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
-
-	return peer->chan;
-}
-
-static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev)
-{
-	struct net_device *netdev;
-	int err = 0;
-
-	netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)),
-			      IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN,
-			      netdev_setup);
-	if (!netdev)
-		return -ENOMEM;
-
-	set_dev_addr(netdev, &chan->src, chan->src_type);
-
-	netdev->netdev_ops = &netdev_ops;
-	SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev);
-	SET_NETDEV_DEVTYPE(netdev, &bt_type);
-
-	*dev = lowpan_btle_dev(netdev);
-	(*dev)->netdev = netdev;
-	(*dev)->hdev = chan->conn->hcon->hdev;
-	INIT_LIST_HEAD(&(*dev)->peers);
-
-	spin_lock(&devices_lock);
-	INIT_LIST_HEAD(&(*dev)->list);
-	list_add_rcu(&(*dev)->list, &bt_6lowpan_devices);
-	spin_unlock(&devices_lock);
-
-	err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE);
-	if (err < 0) {
-		BT_INFO("register_netdev failed %d", err);
-		spin_lock(&devices_lock);
-		list_del_rcu(&(*dev)->list);
-		spin_unlock(&devices_lock);
-		free_netdev(netdev);
-		goto out;
-	}
-
-	BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
-	       netdev->ifindex, &chan->dst, chan->dst_type,
-	       &chan->src, chan->src_type);
-	set_bit(__LINK_STATE_PRESENT, &netdev->state);
-
-	return 0;
-
-out:
-	return err;
-}
-
-static inline void chan_ready_cb(struct l2cap_chan *chan)
-{
-	struct lowpan_btle_dev *dev;
-
-	dev = lookup_dev(chan->conn);
-
-	BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev);
-
-	if (!dev) {
-		if (setup_netdev(chan, &dev) < 0) {
-			l2cap_chan_del(chan, -ENOENT);
-			return;
-		}
-	}
-
-	if (!try_module_get(THIS_MODULE))
-		return;
-
-	add_peer_chan(chan, dev);
-	ifup(dev->netdev);
-}
-
-static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan)
-{
-	struct l2cap_chan *chan;
-
-	chan = chan_create();
-	if (!chan)
-		return NULL;
-
-	chan->ops = pchan->ops;
-
-	BT_DBG("chan %p pchan %p", chan, pchan);
-
-	return chan;
-}
-
-static void delete_netdev(struct work_struct *work)
-{
-	struct lowpan_btle_dev *entry = container_of(work,
-						     struct lowpan_btle_dev,
-						     delete_netdev);
-
-	lowpan_unregister_netdev(entry->netdev);
-
-	/* The entry pointer is deleted by the netdev destructor. */
-}
-
-static void chan_close_cb(struct l2cap_chan *chan)
-{
-	struct lowpan_btle_dev *entry;
-	struct lowpan_btle_dev *dev = NULL;
-	struct lowpan_peer *peer;
-	int err = -ENOENT;
-	bool last = false, remove = true;
-
-	BT_DBG("chan %p conn %p", chan, chan->conn);
-
-	if (chan->conn && chan->conn->hcon) {
-		if (!is_bt_6lowpan(chan->conn->hcon))
-			return;
-
-		/* If conn is set, then the netdev is also there and we should
-		 * not remove it.
-		 */
-		remove = false;
-	}
-
-	spin_lock(&devices_lock);
-
-	list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
-		dev = lowpan_btle_dev(entry->netdev);
-		peer = __peer_lookup_chan(dev, chan);
-		if (peer) {
-			last = peer_del(dev, peer);
-			err = 0;
-
-			BT_DBG("dev %p removing %speer %p", dev,
-			       last ? "last " : "1 ", peer);
-			BT_DBG("chan %p orig refcnt %d", chan,
-			       atomic_read(&chan->kref.refcount));
-
-			l2cap_chan_put(chan);
-			break;
-		}
-	}
-
-	if (!err && last && dev && !atomic_read(&dev->peer_count)) {
-		spin_unlock(&devices_lock);
-
-		cancel_delayed_work_sync(&dev->notify_peers);
-
-		ifdown(dev->netdev);
-
-		if (remove) {
-			INIT_WORK(&entry->delete_netdev, delete_netdev);
-			schedule_work(&entry->delete_netdev);
-		}
-	} else {
-		spin_unlock(&devices_lock);
-	}
-
-	return;
-}
-
-static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
-{
-	BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn,
-	       state_to_string(state), err);
-}
-
-static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
-					 unsigned long hdr_len,
-					 unsigned long len, int nb)
-{
-	/* Note that we must allocate using GFP_ATOMIC here as
-	 * this function is called originally from netdev hard xmit
-	 * function in atomic context.
-	 */
-	return bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
-}
-
-static void chan_suspend_cb(struct l2cap_chan *chan)
-{
-	struct sk_buff *skb = chan->data;
-
-	BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
-
-	if (!skb)
-		return;
-
-	lowpan_cb(skb)->status = -EAGAIN;
-}
-
-static void chan_resume_cb(struct l2cap_chan *chan)
-{
-	struct sk_buff *skb = chan->data;
-
-	BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
-
-	if (!skb)
-		return;
-
-	lowpan_cb(skb)->status = 0;
-}
-
-static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
-{
-	return L2CAP_CONN_TIMEOUT;
-}
-
-static const struct l2cap_ops bt_6lowpan_chan_ops = {
-	.name			= "L2CAP 6LoWPAN channel",
-	.new_connection		= chan_new_conn_cb,
-	.recv			= chan_recv_cb,
-	.close			= chan_close_cb,
-	.state_change		= chan_state_change_cb,
-	.ready			= chan_ready_cb,
-	.resume			= chan_resume_cb,
-	.suspend		= chan_suspend_cb,
-	.get_sndtimeo		= chan_get_sndtimeo_cb,
-	.alloc_skb		= chan_alloc_skb_cb,
-
-	.teardown		= l2cap_chan_no_teardown,
-	.defer			= l2cap_chan_no_defer,
-	.set_shutdown		= l2cap_chan_no_set_shutdown,
-};
-
-static inline __u8 bdaddr_type(__u8 type)
-{
-	if (type == ADDR_LE_DEV_PUBLIC)
-		return BDADDR_LE_PUBLIC;
-	else
-		return BDADDR_LE_RANDOM;
-}
-
-static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
-{
-	struct l2cap_chan *chan;
-	int err;
-
-	chan = chan_create();
-	if (!chan)
-		return -EINVAL;
-
-	chan->ops = &bt_6lowpan_chan_ops;
-
-	err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0,
-				 addr, dst_type);
-
-	BT_DBG("chan %p err %d", chan, err);
-	if (err < 0)
-		l2cap_chan_put(chan);
-
-	return err;
-}
-
-static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
-{
-	struct lowpan_peer *peer;
-
-	BT_DBG("conn %p dst type %d", conn, dst_type);
-
-	peer = lookup_peer(conn);
-	if (!peer)
-		return -ENOENT;
-
-	BT_DBG("peer %p chan %p", peer, peer->chan);
-
-	l2cap_chan_close(peer->chan, ENOENT);
-
-	return 0;
-}
-
-static struct l2cap_chan *bt_6lowpan_listen(void)
-{
-	bdaddr_t *addr = BDADDR_ANY;
-	struct l2cap_chan *chan;
-	int err;
-
-	if (!enable_6lowpan)
-		return NULL;
-
-	chan = chan_create();
-	if (!chan)
-		return NULL;
-
-	chan->ops = &bt_6lowpan_chan_ops;
-	chan->state = BT_LISTEN;
-	chan->src_type = BDADDR_LE_PUBLIC;
-
-	atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
-
-	BT_DBG("chan %p src type %d", chan, chan->src_type);
-
-	err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP));
-	if (err) {
-		l2cap_chan_put(chan);
-		BT_ERR("psm cannot be added err %d", err);
-		return NULL;
-	}
-
-	return chan;
-}
-
-static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
-			  struct l2cap_conn **conn)
-{
-	struct hci_conn *hcon;
-	struct hci_dev *hdev;
-	bdaddr_t *src = BDADDR_ANY;
-	int n;
-
-	n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
-		   &addr->b[5], &addr->b[4], &addr->b[3],
-		   &addr->b[2], &addr->b[1], &addr->b[0],
-		   addr_type);
-
-	if (n < 7)
-		return -EINVAL;
-
-	hdev = hci_get_route(addr, src);
-	if (!hdev)
-		return -ENOENT;
-
-	hci_dev_lock(hdev);
-	hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type);
-	hci_dev_unlock(hdev);
-
-	if (!hcon)
-		return -ENOENT;
-
-	*conn = (struct l2cap_conn *)hcon->l2cap_data;
-
-	BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type);
-
-	return 0;
-}
-
-static void disconnect_all_peers(void)
-{
-	struct lowpan_btle_dev *entry;
-	struct lowpan_peer *peer, *tmp_peer, *new_peer;
-	struct list_head peers;
-
-	INIT_LIST_HEAD(&peers);
-
-	/* We make a separate list of peers as the close_cb() will
-	 * modify the device peers list so it is better not to mess
-	 * with the same list at the same time.
-	 */
-
-	rcu_read_lock();
-
-	list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
-		list_for_each_entry_rcu(peer, &entry->peers, list) {
-			new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC);
-			if (!new_peer)
-				break;
-
-			new_peer->chan = peer->chan;
-			INIT_LIST_HEAD(&new_peer->list);
-
-			list_add(&new_peer->list, &peers);
-		}
-	}
-
-	rcu_read_unlock();
-
-	spin_lock(&devices_lock);
-	list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
-		l2cap_chan_close(peer->chan, ENOENT);
-
-		list_del_rcu(&peer->list);
-		kfree_rcu(peer, rcu);
-	}
-	spin_unlock(&devices_lock);
-}
-
-struct set_enable {
-	struct work_struct work;
-	bool flag;
-};
-
-static void do_enable_set(struct work_struct *work)
-{
-	struct set_enable *set_enable = container_of(work,
-						     struct set_enable, work);
-
-	if (!set_enable->flag || enable_6lowpan != set_enable->flag)
-		/* Disconnect existing connections if 6lowpan is
-		 * disabled
-		 */
-		disconnect_all_peers();
-
-	enable_6lowpan = set_enable->flag;
-
-	if (listen_chan) {
-		l2cap_chan_close(listen_chan, 0);
-		l2cap_chan_put(listen_chan);
-	}
-
-	listen_chan = bt_6lowpan_listen();
-
-	kfree(set_enable);
-}
-
-static int lowpan_enable_set(void *data, u64 val)
-{
-	struct set_enable *set_enable;
-
-	set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL);
-	if (!set_enable)
-		return -ENOMEM;
-
-	set_enable->flag = !!val;
-	INIT_WORK(&set_enable->work, do_enable_set);
-
-	schedule_work(&set_enable->work);
-
-	return 0;
-}
-
-static int lowpan_enable_get(void *data, u64 *val)
-{
-	*val = enable_6lowpan;
-	return 0;
-}
-
-DEFINE_SIMPLE_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get,
-			lowpan_enable_set, "%llu\n");
-
-static ssize_t lowpan_control_write(struct file *fp,
-				    const char __user *user_buffer,
-				    size_t count,
-				    loff_t *position)
-{
-	char buf[32];
-	size_t buf_size = min(count, sizeof(buf) - 1);
-	int ret;
-	bdaddr_t addr;
-	u8 addr_type;
-	struct l2cap_conn *conn = NULL;
-
-	if (copy_from_user(buf, user_buffer, buf_size))
-		return -EFAULT;
-
-	buf[buf_size] = '\0';
-
-	if (memcmp(buf, "connect ", 8) == 0) {
-		ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
-		if (ret == -EINVAL)
-			return ret;
-
-		if (listen_chan) {
-			l2cap_chan_close(listen_chan, 0);
-			l2cap_chan_put(listen_chan);
-			listen_chan = NULL;
-		}
-
-		if (conn) {
-			struct lowpan_peer *peer;
-
-			if (!is_bt_6lowpan(conn->hcon))
-				return -EINVAL;
-
-			peer = lookup_peer(conn);
-			if (peer) {
-				BT_DBG("6LoWPAN connection already exists");
-				return -EALREADY;
-			}
-
-			BT_DBG("conn %p dst %pMR type %d user %d", conn,
-			       &conn->hcon->dst, conn->hcon->dst_type,
-			       addr_type);
-		}
-
-		ret = bt_6lowpan_connect(&addr, addr_type);
-		if (ret < 0)
-			return ret;
-
-		return count;
-	}
-
-	if (memcmp(buf, "disconnect ", 11) == 0) {
-		ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
-		if (ret < 0)
-			return ret;
-
-		ret = bt_6lowpan_disconnect(conn, addr_type);
-		if (ret < 0)
-			return ret;
-
-		return count;
-	}
-
-	return count;
-}
-
-static int lowpan_control_show(struct seq_file *f, void *ptr)
-{
-	struct lowpan_btle_dev *entry;
-	struct lowpan_peer *peer;
-
-	spin_lock(&devices_lock);
-
-	list_for_each_entry(entry, &bt_6lowpan_devices, list) {
-		list_for_each_entry(peer, &entry->peers, list)
-			seq_printf(f, "%pMR (type %u)\n",
-				   &peer->chan->dst, peer->chan->dst_type);
-	}
-
-	spin_unlock(&devices_lock);
-
-	return 0;
-}
-
-static int lowpan_control_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, lowpan_control_show, inode->i_private);
-}
-
-static const struct file_operations lowpan_control_fops = {
-	.open		= lowpan_control_open,
-	.read		= seq_read,
-	.write		= lowpan_control_write,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
-
-static void disconnect_devices(void)
-{
-	struct lowpan_btle_dev *entry, *tmp, *new_dev;
-	struct list_head devices;
-
-	INIT_LIST_HEAD(&devices);
-
-	/* We make a separate list of devices because the unregister_netdev()
-	 * will call device_event() which will also want to modify the same
-	 * devices list.
-	 */
-
-	rcu_read_lock();
-
-	list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
-		new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
-		if (!new_dev)
-			break;
-
-		new_dev->netdev = entry->netdev;
-		INIT_LIST_HEAD(&new_dev->list);
-
-		list_add_rcu(&new_dev->list, &devices);
-	}
-
-	rcu_read_unlock();
-
-	list_for_each_entry_safe(entry, tmp, &devices, list) {
-		ifdown(entry->netdev);
-		BT_DBG("Unregistering netdev %s %p",
-		       entry->netdev->name, entry->netdev);
-		lowpan_unregister_netdev(entry->netdev);
-		kfree(entry);
-	}
-}
-
-static int device_event(struct notifier_block *unused,
-			unsigned long event, void *ptr)
-{
-	struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
-	struct lowpan_btle_dev *entry;
-
-	if (netdev->type != ARPHRD_6LOWPAN)
-		return NOTIFY_DONE;
-
-	switch (event) {
-	case NETDEV_UNREGISTER:
-		spin_lock(&devices_lock);
-		list_for_each_entry(entry, &bt_6lowpan_devices, list) {
-			if (entry->netdev == netdev) {
-				BT_DBG("Unregistered netdev %s %p",
-				       netdev->name, netdev);
-				list_del(&entry->list);
-				break;
-			}
-		}
-		spin_unlock(&devices_lock);
-		break;
-	}
-
-	return NOTIFY_DONE;
-}
-
-static struct notifier_block bt_6lowpan_dev_notifier = {
-	.notifier_call = device_event,
-};
-
-static int __init bt_6lowpan_init(void)
-{
-	lowpan_enable_debugfs = debugfs_create_file("6lowpan_enable", 0644,
-						    bt_debugfs, NULL,
-						    &lowpan_enable_fops);
-	lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644,
-						     bt_debugfs, NULL,
-						     &lowpan_control_fops);
-
-	return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
-}
-
-static void __exit bt_6lowpan_exit(void)
-{
-	debugfs_remove(lowpan_enable_debugfs);
-	debugfs_remove(lowpan_control_debugfs);
-
-	if (listen_chan) {
-		l2cap_chan_close(listen_chan, 0);
-		l2cap_chan_put(listen_chan);
-	}
-
-	disconnect_devices();
-
-	unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
-}
-
-module_init(bt_6lowpan_init);
-module_exit(bt_6lowpan_exit);
-
-MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
-MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
-MODULE_VERSION(VERSION);
-MODULE_LICENSE("GPL");
diff --git a/net/bluetooth/Makefile b/net/bluetooth/Makefile
index b3ff12e..e347828 100644
--- a/net/bluetooth/Makefile
+++ b/net/bluetooth/Makefile
@@ -7,9 +7,6 @@ obj-$(CONFIG_BT_RFCOMM)	+= rfcomm/
 obj-$(CONFIG_BT_BNEP)	+= bnep/
 obj-$(CONFIG_BT_CMTP)	+= cmtp/
 obj-$(CONFIG_BT_HIDP)	+= hidp/
-obj-$(CONFIG_BT_6LOWPAN) += bluetooth_6lowpan.o
-
-bluetooth_6lowpan-y := 6lowpan.o
 
 bluetooth-y := af_bluetooth.o hci_core.o hci_conn.o hci_event.o mgmt.o \
 	hci_sock.o hci_sysfs.o l2cap_core.o l2cap_sock.o smp.o lib.o \
-- 
2.9.2


  parent reply	other threads:[~2016-08-07 14:30 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-07 14:30 [RFCv2 bluetooth-next 00/19] bluetooth: rework 6lowpan implementation Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 01/19] ieee802154: 6lowpan: remove headroom check Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 02/19] ieee802154: 6lowpan: move skb cb BUILD_BUG_ON check Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 03/19] 6lowpan: remove LOWPAN_IPHC_MAX_HEADER_LEN Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 04/19] 6lowpan: hold netdev while unregister Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 05/19] 6lowpan: introduce generic default naming Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 06/19] 6lowpan: move rx defines to generic Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 07/19] bluetooth: introduce l2cap_hdev_chan_connect Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 08/19] bluetooth: add hci dev notifier Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 09/19] bluetooth: introduce l2cap chan priv data Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 10/19] bluetooth: export functions and variables Alexander Aring
2016-08-07 14:30 ` Alexander Aring [this message]
2016-08-07 14:30 ` [RFCv2 bluetooth-next 12/19] ieee802154: 6lowpan: move header create to 6lowpan Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 13/19] 6lowpan: move dev_init to generic Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 14/19] 6lowpan: iphc: override l2 packet information Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 15/19] ipv6: addrconf: fix 48 bit 6lowpan autoconfiguration Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 16/19] 6lowpan: iphc: add handling for btle Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 17/19] 6lowpan: move multicast flags to generic Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 18/19] 6lowpan: move addr_len setting away from generic Alexander Aring
2016-08-07 14:30 ` [RFCv2 bluetooth-next 19/19] 6lowpan: bluetooth: add new implementation Alexander Aring
2016-08-08 12:10 ` [RFCv2 bluetooth-next 00/19] bluetooth: rework 6lowpan implementation Alexander Aring
2016-11-22 12:14   ` Luiz Augusto von Dentz
2016-11-22 15:41     ` Alexander Aring

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