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authorJukka Rissanen <jukka.rissanen@linux.intel.com>2014-09-08 11:11:45 +0200
committerMarcel Holtmann <marcel@holtmann.org>2014-09-09 15:51:47 +0200
commit39e90c77637b3892a39f2908aea57539e961c50e (patch)
treeea10ce3b9c648fd5d82db6e3ebcd5425648c4695
parentBluetooth: 6lowpan: Set the peer IPv6 address correctly (diff)
downloadlinux-39e90c77637b3892a39f2908aea57539e961c50e.tar.xz
linux-39e90c77637b3892a39f2908aea57539e961c50e.zip
Bluetooth: 6lowpan: Route packets that are not meant to peer via correct device
Packets that are supposed to be delivered via the peer device need to be checked and sent to correct device. This requires that user has set the routes properly so that the 6lowpan module can then figure out the destination gateway and the correct Bluetooth device. Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Cc: stable@vger.kernel.org # 3.17.x
-rw-r--r--net/bluetooth/6lowpan.c65
1 files changed, 63 insertions, 2 deletions
diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index b229aed3bf9a..0920cb6ed572 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -39,6 +39,7 @@ static struct dentry *lowpan_control_debugfs;
struct skb_cb {
struct in6_addr addr;
+ struct in6_addr gw;
struct l2cap_chan *chan;
int status;
};
@@ -158,6 +159,54 @@ static inline struct lowpan_peer *peer_lookup_conn(struct lowpan_dev *dev,
return NULL;
}
+static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_dev *dev,
+ struct in6_addr *daddr,
+ struct sk_buff *skb)
+{
+ struct lowpan_peer *peer, *tmp;
+ 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)
+ return list_first_entry(&dev->peers, struct lowpan_peer,
+ list);
+
+ if (!rt) {
+ nexthop = &lowpan_cb(skb)->gw;
+
+ if (ipv6_addr_any(nexthop))
+ return NULL;
+ } else {
+ nexthop = rt6_nexthop(rt);
+
+ /* 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);
+
+ list_for_each_entry_safe(peer, tmp, &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))
+ return peer;
+ }
+
+ return NULL;
+}
+
static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
{
struct lowpan_dev *entry, *tmp;
@@ -415,8 +464,18 @@ static int header_create(struct sk_buff *skb, struct net_device *netdev,
read_unlock_irqrestore(&devices_lock, flags);
if (!peer) {
- BT_DBG("no such peer %pMR found", &addr);
- return -ENOENT;
+ /* 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.
+ */
+ read_lock_irqsave(&devices_lock, flags);
+ peer = peer_lookup_dst(dev, &hdr->daddr, skb);
+ read_unlock_irqrestore(&devices_lock, flags);
+ if (!peer) {
+ BT_DBG("no such peer %pMR found", &addr);
+ return -ENOENT;
+ }
}
daddr = peer->eui64_addr;
@@ -520,6 +579,8 @@ static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
read_lock_irqsave(&devices_lock, flags);
peer = peer_lookup_ba(dev, &addr, addr_type);
+ if (!peer)
+ peer = peer_lookup_dst(dev, &lowpan_cb(skb)->addr, skb);
read_unlock_irqrestore(&devices_lock, flags);
BT_DBG("xmit %s to %pMR type %d IP %pI6c peer %p",