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Diffstat (limited to 'net/bluetooth/6lowpan.c')
-rw-r--r--net/bluetooth/6lowpan.c269
1 files changed, 143 insertions, 126 deletions
diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index ab3b654b05cc..2c21ae8abadc 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -1,14 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
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>
@@ -20,6 +13,7 @@
#include <net/ipv6.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
+#include <net/netdev_lock.h>
#include <net/pkt_sched.h>
#include <net/bluetooth/bluetooth.h>
@@ -57,6 +51,12 @@ static bool enable_6lowpan;
/* We are listening incoming connections via this channel
*/
static struct l2cap_chan *listen_chan;
+static DEFINE_MUTEX(set_lock);
+
+enum {
+ LOWPAN_PEER_CLOSING,
+ LOWPAN_PEER_MAXBITS
+};
struct lowpan_peer {
struct list_head list;
@@ -66,6 +66,8 @@ struct lowpan_peer {
/* peer addresses in various formats */
unsigned char lladdr[ETH_ALEN];
struct in6_addr peer_addr;
+
+ DECLARE_BITMAP(flags, LOWPAN_PEER_MAXBITS);
};
struct lowpan_btle_dev {
@@ -109,34 +111,6 @@ static inline bool peer_del(struct lowpan_btle_dev *dev,
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)
{
@@ -167,30 +141,25 @@ 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);
+ struct rt6_info *rt = dst_rt6_info(skb_dst(skb));
int count = atomic_read(&dev->peer_count);
+ const struct in6_addr *nexthop;
+ struct lowpan_peer *peer;
+ struct neighbour *neigh;
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;
+ if (ipv6_addr_any(&lowpan_cb(skb)->gw)) {
+ /* There is neither route nor gateway,
+ * probably the destination is a direct peer.
+ */
+ nexthop = daddr;
+ } else {
+ /* There is a known gateway
+ */
+ nexthop = &lowpan_cb(skb)->gw;
+ }
} else {
nexthop = rt6_nexthop(rt, daddr);
@@ -206,7 +175,7 @@ static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_btle_dev *dev,
rcu_read_lock();
list_for_each_entry_rcu(peer, &dev->peers, list) {
- BT_DBG("dst addr %pMR dst type %d ip %pI6c",
+ BT_DBG("dst addr %pMR dst type %u ip %pI6c",
&peer->chan->dst, peer->chan->dst_type,
&peer->peer_addr);
@@ -216,6 +185,19 @@ static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_btle_dev *dev,
}
}
+ /* use the neighbour cache for matching addresses assigned by SLAAC */
+ neigh = __ipv6_neigh_lookup(dev->netdev, nexthop);
+ if (neigh) {
+ list_for_each_entry_rcu(peer, &dev->peers, list) {
+ if (!memcmp(neigh->ha, peer->lladdr, ETH_ALEN)) {
+ neigh_release(neigh);
+ rcu_read_unlock();
+ return peer;
+ }
+ }
+ neigh_release(neigh);
+ }
+
rcu_read_unlock();
return NULL;
@@ -266,16 +248,13 @@ static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
if (!skb_cp)
return NET_RX_DROP;
- return netif_rx_ni(skb_cp);
+ return netif_rx(skb_cp);
}
static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
struct lowpan_peer *peer)
{
const u8 *saddr;
- struct lowpan_btle_dev *dev;
-
- dev = lowpan_btle_dev(netdev);
saddr = peer->lladdr;
@@ -317,6 +296,7 @@ static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
local_skb->pkt_type = PACKET_HOST;
local_skb->dev = dev;
+ skb_reset_mac_header(local_skb);
skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
@@ -470,9 +450,9 @@ static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
iv.iov_len = skb->len;
memset(&msg, 0, sizeof(msg));
- iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, skb->len);
+ iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, &iv, 1, skb->len);
- err = l2cap_chan_send(chan, &msg, skb->len);
+ err = l2cap_chan_send(chan, &msg, skb->len, NULL);
if (err > 0) {
netdev->stats.tx_bytes += err;
netdev->stats.tx_packets++;
@@ -507,7 +487,7 @@ static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
local_skb = skb_clone(skb, GFP_ATOMIC);
- BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
+ BT_DBG("xmit %s to %pMR type %u IP %pI6c chan %p",
netdev->name,
&pentry->chan->dst, pentry->chan->dst_type,
&pentry->peer_addr, pentry->chan);
@@ -550,7 +530,7 @@ static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
if (err) {
if (lowpan_cb(skb)->chan) {
- BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
+ BT_DBG("xmit %s to %pMR type %u 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);
@@ -584,7 +564,7 @@ static const struct net_device_ops netdev_ops = {
.ndo_start_xmit = bt_xmit,
};
-static struct header_ops header_ops = {
+static const struct header_ops header_ops = {
.create = header_create,
};
@@ -601,7 +581,7 @@ static void netdev_setup(struct net_device *dev)
dev->needs_free_netdev = true;
}
-static struct device_type bt_type = {
+static const struct device_type bt_type = {
.name = "bluetooth",
};
@@ -610,7 +590,7 @@ static void ifup(struct net_device *netdev)
int err;
rtnl_lock();
- err = dev_open(netdev);
+ err = dev_open(netdev, NULL);
if (err < 0)
BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
rtnl_unlock();
@@ -618,12 +598,8 @@ static void ifup(struct net_device *netdev)
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);
+ dev_close(netdev);
rtnl_unlock();
}
@@ -674,7 +650,6 @@ static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
return NULL;
peer->chan = chan;
- memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
baswap((void *)peer->lladdr, &chan->dst);
@@ -696,7 +671,8 @@ static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev)
{
struct net_device *netdev;
- int err = 0;
+ bdaddr_t addr;
+ int err;
netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)),
IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN,
@@ -705,7 +681,8 @@ static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev)
return -ENOMEM;
netdev->addr_assign_type = NET_ADDR_PERM;
- baswap((void *)netdev->dev_addr, &chan->src);
+ baswap(&addr, &chan->src);
+ __dev_addr_set(netdev, &addr, sizeof(addr));
netdev->netdev_ops = &netdev_ops;
SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev);
@@ -823,7 +800,7 @@ static void chan_close_cb(struct l2cap_chan *chan)
BT_DBG("dev %p removing %speer %p", dev,
last ? "last " : "1 ", peer);
- BT_DBG("chan %p orig refcnt %d", chan,
+ BT_DBG("chan %p orig refcnt %u", chan,
kref_read(&chan->kref));
l2cap_chan_put(chan);
@@ -845,8 +822,6 @@ static void chan_close_cb(struct l2cap_chan *chan)
} else {
spin_unlock(&devices_lock);
}
-
- return;
}
static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
@@ -859,11 +834,16 @@ static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
unsigned long hdr_len,
unsigned long len, int nb)
{
+ struct sk_buff *skb;
+
/* 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);
+ skb = bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
+ if (!skb)
+ return ERR_PTR(-ENOMEM);
+ return skb;
}
static void chan_suspend_cb(struct l2cap_chan *chan)
@@ -914,14 +894,6 @@ static const struct l2cap_ops bt_6lowpan_chan_ops = {
.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;
@@ -934,7 +906,7 @@ static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
chan->ops = &bt_6lowpan_chan_ops;
err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0,
- addr, dst_type);
+ addr, dst_type, L2CAP_CONN_TIMEOUT);
BT_DBG("chan %p err %d", chan, err);
if (err < 0)
@@ -947,7 +919,7 @@ 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);
+ BT_DBG("conn %p dst type %u", conn, dst_type);
peer = lookup_peer(conn);
if (!peer)
@@ -955,7 +927,9 @@ static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
BT_DBG("peer %p chan %p", peer, peer->chan);
+ l2cap_chan_lock(peer->chan);
l2cap_chan_close(peer->chan, ENOENT);
+ l2cap_chan_unlock(peer->chan);
return 0;
}
@@ -979,7 +953,7 @@ static struct l2cap_chan *bt_6lowpan_listen(void)
atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
- BT_DBG("chan %p src type %d", chan, chan->src_type);
+ 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) {
@@ -992,10 +966,11 @@ static struct l2cap_chan *bt_6lowpan_listen(void)
}
static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
- struct l2cap_conn **conn)
+ struct l2cap_conn **conn, bool disconnect)
{
struct hci_conn *hcon;
struct hci_dev *hdev;
+ int le_addr_type;
int n;
n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
@@ -1006,21 +981,41 @@ static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
if (n < 7)
return -EINVAL;
+ if (disconnect) {
+ /* The "disconnect" debugfs command has used different address
+ * type constants than "connect" since 2015. Let's retain that
+ * for now even though it's obviously buggy...
+ */
+ *addr_type += 1;
+ }
+
+ switch (*addr_type) {
+ case BDADDR_LE_PUBLIC:
+ le_addr_type = ADDR_LE_DEV_PUBLIC;
+ break;
+ case BDADDR_LE_RANDOM:
+ le_addr_type = ADDR_LE_DEV_RANDOM;
+ break;
+ default:
+ 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);
+ hcon = hci_conn_hash_lookup_le(hdev, addr, le_addr_type);
hci_dev_unlock(hdev);
+ hci_dev_put(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);
+ BT_DBG("conn %p dst %pMR type %u", *conn, &hcon->dst, hcon->dst_type);
return 0;
}
@@ -1028,41 +1023,52 @@ static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
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);
+ struct lowpan_peer *peer;
+ int nchans;
- /* 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.
+ /* l2cap_chan_close() cannot be called from RCU, and lock ordering
+ * chan->lock > devices_lock prevents taking write side lock, so copy
+ * then close.
*/
rcu_read_lock();
+ list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list)
+ list_for_each_entry_rcu(peer, &entry->peers, list)
+ clear_bit(LOWPAN_PEER_CLOSING, peer->flags);
+ rcu_read_unlock();
- 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;
+ do {
+ struct l2cap_chan *chans[32];
+ int i;
- new_peer->chan = peer->chan;
- INIT_LIST_HEAD(&new_peer->list);
+ nchans = 0;
- list_add(&new_peer->list, &peers);
- }
- }
+ spin_lock(&devices_lock);
- rcu_read_unlock();
+ list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
+ list_for_each_entry_rcu(peer, &entry->peers, list) {
+ if (test_and_set_bit(LOWPAN_PEER_CLOSING,
+ peer->flags))
+ continue;
- spin_lock(&devices_lock);
- list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
- l2cap_chan_close(peer->chan, ENOENT);
+ l2cap_chan_hold(peer->chan);
+ chans[nchans++] = peer->chan;
- list_del_rcu(&peer->list);
- kfree_rcu(peer, rcu);
- }
- spin_unlock(&devices_lock);
+ if (nchans >= ARRAY_SIZE(chans))
+ goto done;
+ }
+ }
+
+done:
+ spin_unlock(&devices_lock);
+
+ for (i = 0; i < nchans; ++i) {
+ l2cap_chan_lock(chans[i]);
+ l2cap_chan_close(chans[i], ENOENT);
+ l2cap_chan_unlock(chans[i]);
+ l2cap_chan_put(chans[i]);
+ }
+ } while (nchans);
}
struct set_enable {
@@ -1083,12 +1089,16 @@ static void do_enable_set(struct work_struct *work)
enable_6lowpan = set_enable->flag;
+ mutex_lock(&set_lock);
if (listen_chan) {
+ l2cap_chan_lock(listen_chan);
l2cap_chan_close(listen_chan, 0);
+ l2cap_chan_unlock(listen_chan);
l2cap_chan_put(listen_chan);
}
listen_chan = bt_6lowpan_listen();
+ mutex_unlock(&set_lock);
kfree(set_enable);
}
@@ -1115,8 +1125,8 @@ static int lowpan_enable_get(void *data, u64 *val)
return 0;
}
-DEFINE_SIMPLE_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get,
- lowpan_enable_set, "%llu\n");
+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,
@@ -1136,15 +1146,19 @@ static ssize_t lowpan_control_write(struct file *fp,
buf[buf_size] = '\0';
if (memcmp(buf, "connect ", 8) == 0) {
- ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
+ ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn, false);
if (ret == -EINVAL)
return ret;
+ mutex_lock(&set_lock);
if (listen_chan) {
+ l2cap_chan_lock(listen_chan);
l2cap_chan_close(listen_chan, 0);
+ l2cap_chan_unlock(listen_chan);
l2cap_chan_put(listen_chan);
listen_chan = NULL;
}
+ mutex_unlock(&set_lock);
if (conn) {
struct lowpan_peer *peer;
@@ -1158,7 +1172,7 @@ static ssize_t lowpan_control_write(struct file *fp,
return -EALREADY;
}
- BT_DBG("conn %p dst %pMR type %d user %d", conn,
+ BT_DBG("conn %p dst %pMR type %d user %u", conn,
&conn->hcon->dst, conn->hcon->dst_type,
addr_type);
}
@@ -1171,7 +1185,7 @@ static ssize_t lowpan_control_write(struct file *fp,
}
if (memcmp(buf, "disconnect ", 11) == 0) {
- ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
+ ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn, true);
if (ret < 0)
return ret;
@@ -1285,9 +1299,10 @@ static struct notifier_block bt_6lowpan_dev_notifier = {
static int __init bt_6lowpan_init(void)
{
- lowpan_enable_debugfs = debugfs_create_file("6lowpan_enable", 0644,
- bt_debugfs, NULL,
- &lowpan_enable_fops);
+ 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);
@@ -1301,7 +1316,9 @@ static void __exit bt_6lowpan_exit(void)
debugfs_remove(lowpan_control_debugfs);
if (listen_chan) {
+ l2cap_chan_lock(listen_chan);
l2cap_chan_close(listen_chan, 0);
+ l2cap_chan_unlock(listen_chan);
l2cap_chan_put(listen_chan);
}
generated by cgit (git 2.34.1) at 2025-12-25 04:22:33 +0000