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-rw-r--r--include/linux/netdevice.h3
-rw-r--r--net/core/dev.c17
-rw-r--r--net/ieee802154/af_ieee802154.c6
-rw-r--r--net/ipv4/arp.c17
-rw-r--r--net/llc/af_llc.c11
5 files changed, 27 insertions, 27 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index a9ac5dc..d31bc3c 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1360,7 +1360,8 @@ static inline struct net_device *first_net_device(struct net *net)
extern int netdev_boot_setup_check(struct net_device *dev);
extern unsigned long netdev_boot_base(const char *prefix, int unit);
-extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
+extern struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
+ const char *hwaddr);
extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
extern void dev_add_pack(struct packet_type *pt);
diff --git a/net/core/dev.c b/net/core/dev.c
index ee605c0..822b15b 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -743,34 +743,31 @@ struct net_device *dev_get_by_index(struct net *net, int ifindex)
EXPORT_SYMBOL(dev_get_by_index);
/**
- * dev_getbyhwaddr - find a device by its hardware address
+ * dev_getbyhwaddr_rcu - find a device by its hardware address
* @net: the applicable net namespace
* @type: media type of device
* @ha: hardware address
*
* Search for an interface by MAC address. Returns NULL if the device
- * is not found or a pointer to the device. The caller must hold the
- * rtnl semaphore. The returned device has not had its ref count increased
+ * is not found or a pointer to the device. The caller must hold RCU
+ * The returned device has not had its ref count increased
* and the caller must therefore be careful about locking
*
- * BUGS:
- * If the API was consistent this would be __dev_get_by_hwaddr
*/
-struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
+struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
+ const char *ha)
{
struct net_device *dev;
- ASSERT_RTNL();
-
- for_each_netdev(net, dev)
+ for_each_netdev_rcu(net, dev)
if (dev->type == type &&
!memcmp(dev->dev_addr, ha, dev->addr_len))
return dev;
return NULL;
}
-EXPORT_SYMBOL(dev_getbyhwaddr);
+EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
{
diff --git a/net/ieee802154/af_ieee802154.c b/net/ieee802154/af_ieee802154.c
index 93c91b6..6df6ecf4 100644
--- a/net/ieee802154/af_ieee802154.c
+++ b/net/ieee802154/af_ieee802154.c
@@ -52,11 +52,11 @@ struct net_device *ieee802154_get_dev(struct net *net,
switch (addr->addr_type) {
case IEEE802154_ADDR_LONG:
- rtnl_lock();
- dev = dev_getbyhwaddr(net, ARPHRD_IEEE802154, addr->hwaddr);
+ rcu_read_lock();
+ dev = dev_getbyhwaddr_rcu(net, ARPHRD_IEEE802154, addr->hwaddr);
if (dev)
dev_hold(dev);
- rtnl_unlock();
+ rcu_read_unlock();
break;
case IEEE802154_ADDR_SHORT:
if (addr->pan_id == 0xffff ||
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 10af759..a2fc7b9 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -1017,13 +1017,14 @@ static int arp_req_set_proxy(struct net *net, struct net_device *dev, int on)
IPV4_DEVCONF_ALL(net, PROXY_ARP) = on;
return 0;
}
- if (__in_dev_get_rtnl(dev)) {
- IN_DEV_CONF_SET(__in_dev_get_rtnl(dev), PROXY_ARP, on);
+ if (__in_dev_get_rcu(dev)) {
+ IN_DEV_CONF_SET(__in_dev_get_rcu(dev), PROXY_ARP, on);
return 0;
}
return -ENXIO;
}
+/* must be called with rcu_read_lock() */
static int arp_req_set_public(struct net *net, struct arpreq *r,
struct net_device *dev)
{
@@ -1033,7 +1034,7 @@ static int arp_req_set_public(struct net *net, struct arpreq *r,
if (mask && mask != htonl(0xFFFFFFFF))
return -EINVAL;
if (!dev && (r->arp_flags & ATF_COM)) {
- dev = dev_getbyhwaddr(net, r->arp_ha.sa_family,
+ dev = dev_getbyhwaddr_rcu(net, r->arp_ha.sa_family,
r->arp_ha.sa_data);
if (!dev)
return -ENODEV;
@@ -1225,10 +1226,10 @@ int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg)
if (!(r.arp_flags & ATF_NETMASK))
((struct sockaddr_in *)&r.arp_netmask)->sin_addr.s_addr =
htonl(0xFFFFFFFFUL);
- rtnl_lock();
+ rcu_read_lock();
if (r.arp_dev[0]) {
err = -ENODEV;
- dev = __dev_get_by_name(net, r.arp_dev);
+ dev = dev_get_by_name_rcu(net, r.arp_dev);
if (dev == NULL)
goto out;
@@ -1252,12 +1253,12 @@ int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg)
break;
case SIOCGARP:
err = arp_req_get(&r, dev);
- if (!err && copy_to_user(arg, &r, sizeof(r)))
- err = -EFAULT;
break;
}
out:
- rtnl_unlock();
+ rcu_read_unlock();
+ if (cmd == SIOCGARP && !err && copy_to_user(arg, &r, sizeof(r)))
+ err = -EFAULT;
return err;
}
diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index 5826129..dfd3a64 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -316,9 +316,9 @@ static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
if (unlikely(addr->sllc_family != AF_LLC))
goto out;
rc = -ENODEV;
- rtnl_lock();
+ rcu_read_lock();
if (sk->sk_bound_dev_if) {
- llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
+ llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
if (llc->dev) {
if (!addr->sllc_arphrd)
addr->sllc_arphrd = llc->dev->type;
@@ -329,14 +329,15 @@ static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
!llc_mac_match(addr->sllc_mac,
llc->dev->dev_addr)) {
rc = -EINVAL;
- dev_put(llc->dev);
llc->dev = NULL;
}
}
} else
- llc->dev = dev_getbyhwaddr(&init_net, addr->sllc_arphrd,
+ llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
addr->sllc_mac);
- rtnl_unlock();
+ if (llc->dev)
+ dev_hold(llc->dev);
+ rcu_read_unlock();
if (!llc->dev)
goto out;
if (!addr->sllc_sap) {
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