net/hsr: Move slave init to hsr_slave.c.
Also try to prevent some possible slave dereference race conditions. This is
finalized in the next patch, which abandons the slave array in favour of
a list_head list and list RCU.
Signed-off-by: Arvid Brodin <arvid.brodin@alten.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/hsr/hsr_netlink.c b/net/hsr/hsr_netlink.c
index bea250e..a2ce359 100644
--- a/net/hsr/hsr_netlink.c
+++ b/net/hsr/hsr_netlink.c
@@ -64,16 +64,28 @@
static int hsr_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
struct hsr_priv *hsr;
+ struct net_device *slave;
+ int res;
hsr = netdev_priv(dev);
- if (hsr->slave[0])
- if (nla_put_u32(skb, IFLA_HSR_SLAVE1, hsr->slave[0]->ifindex))
- goto nla_put_failure;
+ res = 0;
- if (hsr->slave[1])
- if (nla_put_u32(skb, IFLA_HSR_SLAVE2, hsr->slave[1]->ifindex))
- goto nla_put_failure;
+ rcu_read_lock();
+ slave = hsr->slave[0];
+ if (slave)
+ res = nla_put_u32(skb, IFLA_HSR_SLAVE1, slave->ifindex);
+ rcu_read_unlock();
+ if (res)
+ goto nla_put_failure;
+
+ rcu_read_lock();
+ slave = hsr->slave[1];
+ if (slave)
+ res = nla_put_u32(skb, IFLA_HSR_SLAVE2, slave->ifindex);
+ rcu_read_unlock();
+ if (res)
+ goto nla_put_failure;
if (nla_put(skb, IFLA_HSR_SUPERVISION_ADDR, ETH_ALEN,
hsr->sup_multicast_addr) ||
@@ -132,6 +144,7 @@
enum hsr_dev_idx dev_idx)
{
struct sk_buff *skb;
+ struct net_device *slave;
void *msg_head;
int res;
int ifindex;
@@ -148,10 +161,14 @@
if (res < 0)
goto nla_put_failure;
- if (hsr->slave[dev_idx])
- ifindex = hsr->slave[dev_idx]->ifindex;
+ rcu_read_lock();
+ slave = hsr->slave[dev_idx];
+ if (slave)
+ ifindex = slave->ifindex;
else
ifindex = -1;
+ rcu_read_unlock();
+
res = nla_put_u32(skb, HSR_A_IFINDEX, ifindex);
if (res < 0)
goto nla_put_failure;
@@ -215,7 +232,7 @@
{
/* For receiving */
struct nlattr *na;
- struct net_device *hsr_dev;
+ struct net_device *hsr_dev, *slave;
/* For sending */
struct sk_buff *skb_out;
@@ -301,9 +318,11 @@
res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq);
if (res < 0)
goto nla_put_failure;
- if (hsr->slave[0])
- res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX,
- hsr->slave[0]->ifindex);
+ rcu_read_lock();
+ slave = hsr->slave[0];
+ if (slave)
+ res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX, slave->ifindex);
+ rcu_read_unlock();
if (res < 0)
goto nla_put_failure;
@@ -313,9 +332,13 @@
res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq);
if (res < 0)
goto nla_put_failure;
- if (hsr->slave[1])
- res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX,
- hsr->slave[1]->ifindex);
+ rcu_read_lock();
+ slave = hsr->slave[1];
+ if (slave)
+ res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX, slave->ifindex);
+ rcu_read_unlock();
+ if (res < 0)
+ goto nla_put_failure;
genlmsg_end(skb_out, msg_head);
genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
