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1281 lines
27 KiB
1281 lines
27 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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Copyright (c) 2013-2014 Intel Corp. |
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|
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*/ |
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|
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#include <linux/if_arp.h> |
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#include <linux/netdevice.h> |
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#include <linux/etherdevice.h> |
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#include <linux/module.h> |
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#include <linux/debugfs.h> |
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|
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#include <net/ipv6.h> |
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#include <net/ip6_route.h> |
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#include <net/addrconf.h> |
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#include <net/pkt_sched.h> |
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#include <net/bluetooth/bluetooth.h> |
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#include <net/bluetooth/hci_core.h> |
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#include <net/bluetooth/l2cap.h> |
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#include <net/6lowpan.h> /* for the compression support */ |
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#define VERSION "0.1" |
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static struct dentry *lowpan_enable_debugfs; |
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static struct dentry *lowpan_control_debugfs; |
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#define IFACE_NAME_TEMPLATE "bt%d" |
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struct skb_cb { |
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struct in6_addr addr; |
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struct in6_addr gw; |
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struct l2cap_chan *chan; |
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}; |
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#define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb)) |
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|
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/* The devices list contains those devices that we are acting |
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* as a proxy. The BT 6LoWPAN device is a virtual device that |
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* connects to the Bluetooth LE device. The real connection to |
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* BT device is done via l2cap layer. There exists one |
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* virtual device / one BT 6LoWPAN network (=hciX device). |
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* The list contains struct lowpan_dev elements. |
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*/ |
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static LIST_HEAD(bt_6lowpan_devices); |
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static DEFINE_SPINLOCK(devices_lock); |
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static bool enable_6lowpan; |
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/* We are listening incoming connections via this channel |
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*/ |
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static struct l2cap_chan *listen_chan; |
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static DEFINE_MUTEX(set_lock); |
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struct lowpan_peer { |
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struct list_head list; |
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struct rcu_head rcu; |
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struct l2cap_chan *chan; |
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/* peer addresses in various formats */ |
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unsigned char lladdr[ETH_ALEN]; |
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struct in6_addr peer_addr; |
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}; |
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struct lowpan_btle_dev { |
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struct list_head list; |
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struct hci_dev *hdev; |
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struct net_device *netdev; |
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struct list_head peers; |
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atomic_t peer_count; /* number of items in peers list */ |
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struct work_struct delete_netdev; |
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struct delayed_work notify_peers; |
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}; |
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static inline struct lowpan_btle_dev * |
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lowpan_btle_dev(const struct net_device *netdev) |
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{ |
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return (struct lowpan_btle_dev *)lowpan_dev(netdev)->priv; |
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} |
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static inline void peer_add(struct lowpan_btle_dev *dev, |
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struct lowpan_peer *peer) |
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{ |
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list_add_rcu(&peer->list, &dev->peers); |
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atomic_inc(&dev->peer_count); |
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} |
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static inline bool peer_del(struct lowpan_btle_dev *dev, |
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struct lowpan_peer *peer) |
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{ |
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list_del_rcu(&peer->list); |
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kfree_rcu(peer, rcu); |
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module_put(THIS_MODULE); |
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if (atomic_dec_and_test(&dev->peer_count)) { |
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BT_DBG("last peer"); |
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return true; |
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} |
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return false; |
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} |
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static inline struct lowpan_peer * |
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__peer_lookup_chan(struct lowpan_btle_dev *dev, struct l2cap_chan *chan) |
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{ |
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struct lowpan_peer *peer; |
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list_for_each_entry_rcu(peer, &dev->peers, list) { |
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if (peer->chan == chan) |
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return peer; |
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} |
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return NULL; |
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} |
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static inline struct lowpan_peer * |
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__peer_lookup_conn(struct lowpan_btle_dev *dev, struct l2cap_conn *conn) |
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{ |
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struct lowpan_peer *peer; |
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list_for_each_entry_rcu(peer, &dev->peers, list) { |
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if (peer->chan->conn == conn) |
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return peer; |
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} |
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return NULL; |
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} |
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static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_btle_dev *dev, |
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struct in6_addr *daddr, |
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struct sk_buff *skb) |
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{ |
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struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
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int count = atomic_read(&dev->peer_count); |
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const struct in6_addr *nexthop; |
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struct lowpan_peer *peer; |
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struct neighbour *neigh; |
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BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt); |
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if (!rt) { |
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if (ipv6_addr_any(&lowpan_cb(skb)->gw)) { |
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/* There is neither route nor gateway, |
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* probably the destination is a direct peer. |
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*/ |
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nexthop = daddr; |
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} else { |
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/* There is a known gateway |
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*/ |
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nexthop = &lowpan_cb(skb)->gw; |
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} |
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} else { |
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nexthop = rt6_nexthop(rt, daddr); |
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/* We need to remember the address because it is needed |
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* by bt_xmit() when sending the packet. In bt_xmit(), the |
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* destination routing info is not set. |
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*/ |
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memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr)); |
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} |
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BT_DBG("gw %pI6c", nexthop); |
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rcu_read_lock(); |
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list_for_each_entry_rcu(peer, &dev->peers, list) { |
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BT_DBG("dst addr %pMR dst type %u ip %pI6c", |
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&peer->chan->dst, peer->chan->dst_type, |
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&peer->peer_addr); |
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if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) { |
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rcu_read_unlock(); |
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return peer; |
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} |
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} |
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/* use the neighbour cache for matching addresses assigned by SLAAC */ |
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neigh = __ipv6_neigh_lookup(dev->netdev, nexthop); |
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if (neigh) { |
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list_for_each_entry_rcu(peer, &dev->peers, list) { |
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if (!memcmp(neigh->ha, peer->lladdr, ETH_ALEN)) { |
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neigh_release(neigh); |
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rcu_read_unlock(); |
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return peer; |
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} |
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} |
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neigh_release(neigh); |
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} |
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rcu_read_unlock(); |
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return NULL; |
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} |
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static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn) |
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{ |
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struct lowpan_btle_dev *entry; |
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struct lowpan_peer *peer = NULL; |
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rcu_read_lock(); |
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list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
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peer = __peer_lookup_conn(entry, conn); |
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if (peer) |
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break; |
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} |
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rcu_read_unlock(); |
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return peer; |
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} |
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static struct lowpan_btle_dev *lookup_dev(struct l2cap_conn *conn) |
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{ |
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struct lowpan_btle_dev *entry; |
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struct lowpan_btle_dev *dev = NULL; |
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rcu_read_lock(); |
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list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
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if (conn->hcon->hdev == entry->hdev) { |
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dev = entry; |
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break; |
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} |
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} |
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rcu_read_unlock(); |
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return dev; |
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} |
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static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev) |
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{ |
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struct sk_buff *skb_cp; |
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skb_cp = skb_copy(skb, GFP_ATOMIC); |
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if (!skb_cp) |
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return NET_RX_DROP; |
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return netif_rx_ni(skb_cp); |
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} |
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static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev, |
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struct lowpan_peer *peer) |
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{ |
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const u8 *saddr; |
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saddr = peer->lladdr; |
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return lowpan_header_decompress(skb, netdev, netdev->dev_addr, saddr); |
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} |
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static int recv_pkt(struct sk_buff *skb, struct net_device *dev, |
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struct lowpan_peer *peer) |
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{ |
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struct sk_buff *local_skb; |
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int ret; |
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if (!netif_running(dev)) |
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goto drop; |
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if (dev->type != ARPHRD_6LOWPAN || !skb->len) |
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goto drop; |
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skb_reset_network_header(skb); |
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skb = skb_share_check(skb, GFP_ATOMIC); |
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if (!skb) |
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goto drop; |
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/* check that it's our buffer */ |
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if (lowpan_is_ipv6(*skb_network_header(skb))) { |
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/* Pull off the 1-byte of 6lowpan header. */ |
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skb_pull(skb, 1); |
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/* Copy the packet so that the IPv6 header is |
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* properly aligned. |
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*/ |
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local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, |
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skb_tailroom(skb), GFP_ATOMIC); |
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if (!local_skb) |
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goto drop; |
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local_skb->protocol = htons(ETH_P_IPV6); |
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local_skb->pkt_type = PACKET_HOST; |
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local_skb->dev = dev; |
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skb_set_transport_header(local_skb, sizeof(struct ipv6hdr)); |
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if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) { |
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kfree_skb(local_skb); |
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goto drop; |
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} |
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dev->stats.rx_bytes += skb->len; |
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dev->stats.rx_packets++; |
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consume_skb(local_skb); |
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consume_skb(skb); |
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} else if (lowpan_is_iphc(*skb_network_header(skb))) { |
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local_skb = skb_clone(skb, GFP_ATOMIC); |
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if (!local_skb) |
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goto drop; |
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local_skb->dev = dev; |
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ret = iphc_decompress(local_skb, dev, peer); |
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if (ret < 0) { |
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BT_DBG("iphc_decompress failed: %d", ret); |
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kfree_skb(local_skb); |
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goto drop; |
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} |
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local_skb->protocol = htons(ETH_P_IPV6); |
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local_skb->pkt_type = PACKET_HOST; |
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if (give_skb_to_upper(local_skb, dev) |
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!= NET_RX_SUCCESS) { |
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kfree_skb(local_skb); |
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goto drop; |
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} |
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dev->stats.rx_bytes += skb->len; |
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dev->stats.rx_packets++; |
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consume_skb(local_skb); |
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consume_skb(skb); |
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} else { |
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BT_DBG("unknown packet type"); |
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goto drop; |
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} |
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return NET_RX_SUCCESS; |
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drop: |
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dev->stats.rx_dropped++; |
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return NET_RX_DROP; |
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} |
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/* Packet from BT LE device */ |
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static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
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{ |
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struct lowpan_btle_dev *dev; |
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struct lowpan_peer *peer; |
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int err; |
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peer = lookup_peer(chan->conn); |
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if (!peer) |
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return -ENOENT; |
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dev = lookup_dev(chan->conn); |
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if (!dev || !dev->netdev) |
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return -ENOENT; |
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err = recv_pkt(skb, dev->netdev, peer); |
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if (err) { |
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BT_DBG("recv pkt %d", err); |
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err = -EAGAIN; |
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} |
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return err; |
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} |
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static int setup_header(struct sk_buff *skb, struct net_device *netdev, |
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bdaddr_t *peer_addr, u8 *peer_addr_type) |
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{ |
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struct in6_addr ipv6_daddr; |
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struct ipv6hdr *hdr; |
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struct lowpan_btle_dev *dev; |
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struct lowpan_peer *peer; |
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u8 *daddr; |
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int err, status = 0; |
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hdr = ipv6_hdr(skb); |
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dev = lowpan_btle_dev(netdev); |
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memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr)); |
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if (ipv6_addr_is_multicast(&ipv6_daddr)) { |
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lowpan_cb(skb)->chan = NULL; |
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daddr = NULL; |
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} else { |
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BT_DBG("dest IP %pI6c", &ipv6_daddr); |
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/* The packet might be sent to 6lowpan interface |
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* because of routing (either via default route |
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* or user set route) so get peer according to |
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* the destination address. |
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*/ |
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peer = peer_lookup_dst(dev, &ipv6_daddr, skb); |
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if (!peer) { |
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BT_DBG("no such peer"); |
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return -ENOENT; |
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} |
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daddr = peer->lladdr; |
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*peer_addr = peer->chan->dst; |
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*peer_addr_type = peer->chan->dst_type; |
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lowpan_cb(skb)->chan = peer->chan; |
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status = 1; |
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} |
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lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr); |
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err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0); |
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if (err < 0) |
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return err; |
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return status; |
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} |
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static int header_create(struct sk_buff *skb, struct net_device *netdev, |
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unsigned short type, const void *_daddr, |
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const void *_saddr, unsigned int len) |
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{ |
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if (type != ETH_P_IPV6) |
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return -EINVAL; |
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return 0; |
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} |
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/* Packet to BT LE device */ |
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static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb, |
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struct net_device *netdev) |
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{ |
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struct msghdr msg; |
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struct kvec iv; |
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int err; |
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/* Remember the skb so that we can send EAGAIN to the caller if |
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* we run out of credits. |
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*/ |
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chan->data = skb; |
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iv.iov_base = skb->data; |
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iv.iov_len = skb->len; |
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memset(&msg, 0, sizeof(msg)); |
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iov_iter_kvec(&msg.msg_iter, WRITE, &iv, 1, skb->len); |
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err = l2cap_chan_send(chan, &msg, skb->len); |
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if (err > 0) { |
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netdev->stats.tx_bytes += err; |
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netdev->stats.tx_packets++; |
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return 0; |
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} |
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if (err < 0) |
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netdev->stats.tx_errors++; |
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return err; |
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} |
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static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev) |
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{ |
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struct sk_buff *local_skb; |
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struct lowpan_btle_dev *entry; |
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int err = 0; |
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rcu_read_lock(); |
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list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
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struct lowpan_peer *pentry; |
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struct lowpan_btle_dev *dev; |
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if (entry->netdev != netdev) |
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continue; |
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dev = lowpan_btle_dev(entry->netdev); |
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list_for_each_entry_rcu(pentry, &dev->peers, list) { |
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int ret; |
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local_skb = skb_clone(skb, GFP_ATOMIC); |
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BT_DBG("xmit %s to %pMR type %u IP %pI6c chan %p", |
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netdev->name, |
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&pentry->chan->dst, pentry->chan->dst_type, |
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&pentry->peer_addr, pentry->chan); |
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ret = send_pkt(pentry->chan, local_skb, netdev); |
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if (ret < 0) |
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err = ret; |
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kfree_skb(local_skb); |
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} |
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} |
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rcu_read_unlock(); |
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return err; |
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} |
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static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev) |
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{ |
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int err = 0; |
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bdaddr_t addr; |
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u8 addr_type; |
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|
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/* We must take a copy of the skb before we modify/replace the ipv6 |
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* header as the header could be used elsewhere |
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*/ |
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skb = skb_unshare(skb, GFP_ATOMIC); |
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if (!skb) |
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return NET_XMIT_DROP; |
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|
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/* Return values from setup_header() |
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* <0 - error, packet is dropped |
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* 0 - this is a multicast packet |
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* 1 - this is unicast packet |
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*/ |
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err = setup_header(skb, netdev, &addr, &addr_type); |
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if (err < 0) { |
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kfree_skb(skb); |
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return NET_XMIT_DROP; |
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} |
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|
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if (err) { |
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if (lowpan_cb(skb)->chan) { |
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BT_DBG("xmit %s to %pMR type %u IP %pI6c chan %p", |
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netdev->name, &addr, addr_type, |
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&lowpan_cb(skb)->addr, lowpan_cb(skb)->chan); |
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err = send_pkt(lowpan_cb(skb)->chan, skb, netdev); |
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} else { |
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err = -ENOENT; |
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} |
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} else { |
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/* We need to send the packet to every device behind this |
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* interface. |
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*/ |
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err = send_mcast_pkt(skb, netdev); |
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} |
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|
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dev_kfree_skb(skb); |
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|
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if (err) |
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BT_DBG("ERROR: xmit failed (%d)", err); |
|
|
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return err < 0 ? NET_XMIT_DROP : err; |
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} |
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|
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static int bt_dev_init(struct net_device *dev) |
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{ |
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netdev_lockdep_set_classes(dev); |
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|
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return 0; |
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} |
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|
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static const struct net_device_ops netdev_ops = { |
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.ndo_init = bt_dev_init, |
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.ndo_start_xmit = bt_xmit, |
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}; |
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|
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static const struct header_ops header_ops = { |
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.create = header_create, |
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}; |
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|
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static void netdev_setup(struct net_device *dev) |
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{ |
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dev->hard_header_len = 0; |
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dev->needed_tailroom = 0; |
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dev->flags = IFF_RUNNING | IFF_MULTICAST; |
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dev->watchdog_timeo = 0; |
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dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
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|
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dev->netdev_ops = &netdev_ops; |
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dev->header_ops = &header_ops; |
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dev->needs_free_netdev = true; |
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} |
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|
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static struct device_type bt_type = { |
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.name = "bluetooth", |
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}; |
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|
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static void ifup(struct net_device *netdev) |
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{ |
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int err; |
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|
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rtnl_lock(); |
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err = dev_open(netdev, NULL); |
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if (err < 0) |
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BT_INFO("iface %s cannot be opened (%d)", netdev->name, err); |
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rtnl_unlock(); |
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} |
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|
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static void ifdown(struct net_device *netdev) |
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{ |
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rtnl_lock(); |
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dev_close(netdev); |
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rtnl_unlock(); |
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} |
|
|
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static void do_notify_peers(struct work_struct *work) |
|
{ |
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struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_dev, |
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notify_peers.work); |
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|
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netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */ |
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} |
|
|
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static bool is_bt_6lowpan(struct hci_conn *hcon) |
|
{ |
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if (hcon->type != LE_LINK) |
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return false; |
|
|
|
if (!enable_6lowpan) |
|
return false; |
|
|
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return true; |
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} |
|
|
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static struct l2cap_chan *chan_create(void) |
|
{ |
|
struct l2cap_chan *chan; |
|
|
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chan = l2cap_chan_create(); |
|
if (!chan) |
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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 struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan, |
|
struct lowpan_btle_dev *dev, |
|
bool new_netdev) |
|
{ |
|
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)); |
|
|
|
baswap((void *)peer->lladdr, &chan->dst); |
|
|
|
lowpan_iphc_uncompress_eui48_lladdr(&peer->peer_addr, peer->lladdr); |
|
|
|
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 */ |
|
if (new_netdev) |
|
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; |
|
|
|
netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)), |
|
IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN, |
|
netdev_setup); |
|
if (!netdev) |
|
return -ENOMEM; |
|
|
|
netdev->addr_assign_type = NET_ADDR_PERM; |
|
baswap((void *)netdev->dev_addr, &chan->src); |
|
|
|
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; |
|
bool new_netdev = false; |
|
|
|
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; |
|
} |
|
new_netdev = true; |
|
} |
|
|
|
if (!try_module_get(THIS_MODULE)) |
|
return; |
|
|
|
add_peer_chan(chan, dev, new_netdev); |
|
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 %u", chan, |
|
kref_read(&chan->kref)); |
|
|
|
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); |
|
} |
|
} |
|
|
|
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 lowpan_btle_dev *dev; |
|
|
|
BT_DBG("chan %p suspend", chan); |
|
|
|
dev = lookup_dev(chan->conn); |
|
if (!dev || !dev->netdev) |
|
return; |
|
|
|
netif_stop_queue(dev->netdev); |
|
} |
|
|
|
static void chan_resume_cb(struct l2cap_chan *chan) |
|
{ |
|
struct lowpan_btle_dev *dev; |
|
|
|
BT_DBG("chan %p resume", chan); |
|
|
|
dev = lookup_dev(chan->conn); |
|
if (!dev || !dev->netdev) |
|
return; |
|
|
|
netif_wake_queue(dev->netdev); |
|
} |
|
|
|
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 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 %u", 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 %u", 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; |
|
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; |
|
|
|
/* The LE_PUBLIC address type is ignored because of BDADDR_ANY */ |
|
hdev = hci_get_route(addr, BDADDR_ANY, BDADDR_LE_PUBLIC); |
|
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 %u", *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; |
|
|
|
mutex_lock(&set_lock); |
|
if (listen_chan) { |
|
l2cap_chan_close(listen_chan, 0); |
|
l2cap_chan_put(listen_chan); |
|
} |
|
|
|
listen_chan = bt_6lowpan_listen(); |
|
mutex_unlock(&set_lock); |
|
|
|
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_DEBUGFS_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; |
|
|
|
mutex_lock(&set_lock); |
|
if (listen_chan) { |
|
l2cap_chan_close(listen_chan, 0); |
|
l2cap_chan_put(listen_chan); |
|
listen_chan = NULL; |
|
} |
|
mutex_unlock(&set_lock); |
|
|
|
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 %u", 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_unsafe("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 <[email protected]>"); |
|
MODULE_DESCRIPTION("Bluetooth 6LoWPAN"); |
|
MODULE_VERSION(VERSION); |
|
MODULE_LICENSE("GPL");
|
|
|