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_device.c b/net/hsr/hsr_device.c
index 8936b3c..1f8869c 100644
--- a/net/hsr/hsr_device.c
+++ b/net/hsr/hsr_device.c
@@ -15,7 +15,6 @@
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
-#include <linux/if_arp.h>
#include <linux/rtnetlink.h>
#include <linux/pkt_sched.h>
#include "hsr_device.h"
@@ -108,23 +107,27 @@
hsr_check_announce(hsr->dev, old_operstate);
}
-
int hsr_get_max_mtu(struct hsr_priv *hsr)
{
- int mtu_max;
+ unsigned int mtu_max;
+ struct net_device *slave;
- if (hsr->slave[0] && hsr->slave[1])
- mtu_max = min(hsr->slave[0]->mtu, hsr->slave[1]->mtu);
- else if (hsr->slave[0])
- mtu_max = hsr->slave[0]->mtu;
- else if (hsr->slave[1])
- mtu_max = hsr->slave[1]->mtu;
- else
- mtu_max = HSR_HLEN;
+ mtu_max = ETH_DATA_LEN;
+ rcu_read_lock();
+ slave = hsr->slave[0];
+ if (slave)
+ mtu_max = min(slave->mtu, mtu_max);
+ slave = hsr->slave[1];
+ if (slave)
+ mtu_max = min(slave->mtu, mtu_max);
+ rcu_read_unlock();
+ if (mtu_max < HSR_HLEN)
+ return 0;
return mtu_max - HSR_HLEN;
}
+
static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu)
{
struct hsr_priv *hsr;
@@ -145,18 +148,20 @@
static int hsr_dev_open(struct net_device *dev)
{
struct hsr_priv *hsr;
+ struct net_device *slave;
int i;
char *slave_name;
hsr = netdev_priv(dev);
for (i = 0; i < HSR_MAX_SLAVE; i++) {
- if (hsr->slave[i])
- slave_name = hsr->slave[i]->name;
+ slave = hsr->slave[i];
+ if (slave)
+ slave_name = slave->name;
else
slave_name = "null";
- if (!is_slave_up(hsr->slave[i]))
+ if (!is_slave_up(slave))
netdev_warn(dev, "Slave %c (%s) is not up; please bring it up to get a working HSR network\n",
'A' + i, slave_name);
}
@@ -223,6 +228,8 @@
hsr_ethhdr = (struct hsr_ethhdr *) skb->data;
skb->dev = hsr->slave[dev_idx];
+ if (unlikely(!skb->dev))
+ return NET_XMIT_DROP;
hsr_addr_subst_dest(hsr, &hsr_ethhdr->ethhdr, dev_idx);
@@ -252,14 +259,8 @@
}
skb2 = pskb_copy(skb, GFP_ATOMIC);
-
- res1 = NET_XMIT_DROP;
- if (likely(hsr->slave[HSR_DEV_SLAVE_A]))
- res1 = slave_xmit(skb, hsr, HSR_DEV_SLAVE_A);
-
- res2 = NET_XMIT_DROP;
- if (likely(skb2 && hsr->slave[HSR_DEV_SLAVE_B]))
- res2 = slave_xmit(skb2, hsr, HSR_DEV_SLAVE_B);
+ res1 = slave_xmit(skb, hsr, HSR_DEV_SLAVE_A);
+ res2 = slave_xmit(skb2, hsr, HSR_DEV_SLAVE_B);
if (likely(res1 == NET_XMIT_SUCCESS || res1 == NET_XMIT_CN ||
res2 == NET_XMIT_SUCCESS || res2 == NET_XMIT_CN)) {
@@ -406,28 +407,10 @@
static void restore_slaves(struct net_device *hsr_dev)
{
struct hsr_priv *hsr;
- int i;
- int res;
hsr = netdev_priv(hsr_dev);
-
- rtnl_lock();
-
- for (i = 0; i < HSR_MAX_SLAVE; i++) {
- if (!hsr->slave[i])
- continue;
- res = dev_set_promiscuity(hsr->slave[i], -1);
- if (res)
- netdev_info(hsr_dev,
- "Cannot restore slave promiscuity (%s, %d)\n",
- hsr->slave[i]->name, res);
-
- if (hsr->slave[i]->rx_handler == hsr_handle_frame)
- netdev_rx_handler_unregister(hsr->slave[i]);
- }
-
-
- rtnl_unlock();
+ hsr_del_slave(hsr, 1);
+ hsr_del_slave(hsr, 0);
}
static void reclaim_hsr_dev(struct rcu_head *rh)
@@ -483,38 +466,6 @@
return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit);
}
-static int check_slave_ok(struct net_device *dev)
-{
- /* Don't allow HSR on non-ethernet like devices */
- if ((dev->flags & IFF_LOOPBACK) || (dev->type != ARPHRD_ETHER) ||
- (dev->addr_len != ETH_ALEN)) {
- netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n");
- return -EINVAL;
- }
-
- /* Don't allow enslaving hsr devices */
- if (is_hsr_master(dev)) {
- netdev_info(dev, "Cannot create trees of HSR devices.\n");
- return -EINVAL;
- }
-
- if (is_hsr_slave(dev)) {
- netdev_info(dev, "This device is already a HSR slave.\n");
- return -EINVAL;
- }
-
- if (dev->priv_flags & IFF_802_1Q_VLAN) {
- netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n");
- return -EINVAL;
- }
-
- /* HSR over bonded devices has not been tested, but I'm not sure it
- * won't work...
- */
-
- return 0;
-}
-
/* Default multicast address for HSR Supervision frames */
static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = {
@@ -525,15 +476,30 @@
unsigned char multicast_spec)
{
struct hsr_priv *hsr;
- int i;
int res;
hsr = netdev_priv(hsr_dev);
hsr->dev = hsr_dev;
+ hsr->slave[0] = NULL;
+ hsr->slave[1] = NULL;
INIT_LIST_HEAD(&hsr->node_db);
INIT_LIST_HEAD(&hsr->self_node_db);
- for (i = 0; i < HSR_MAX_SLAVE; i++)
- hsr->slave[i] = slave[i];
+
+ ether_addr_copy(hsr_dev->dev_addr, slave[0]->dev_addr);
+
+ /* Make sure we recognize frames from ourselves in hsr_rcv() */
+ res = hsr_create_self_node(&hsr->self_node_db, hsr_dev->dev_addr,
+ slave[1]->dev_addr);
+ if (res < 0)
+ return res;
+
+ hsr_dev->features = slave[0]->features & slave[1]->features;
+ /* Prevent recursive tx locking */
+ hsr_dev->features |= NETIF_F_LLTX;
+ /* VLAN on top of HSR needs testing and probably some work on
+ * hsr_header_create() etc.
+ */
+ hsr_dev->features |= NETIF_F_VLAN_CHALLENGED;
spin_lock_init(&hsr->seqnr_lock);
/* Overflow soon to find bugs easier: */
@@ -560,65 +526,21 @@
* IFF_HSR_MASTER/SLAVE?
*/
- for (i = 0; i < HSR_MAX_SLAVE; i++) {
- res = check_slave_ok(slave[i]);
- if (res)
- return res;
- }
-
- hsr_dev->features = slave[0]->features & slave[1]->features;
- /* Prevent recursive tx locking */
- hsr_dev->features |= NETIF_F_LLTX;
- /* VLAN on top of HSR needs testing and probably some work on
- * hsr_header_create() etc.
- */
- hsr_dev->features |= NETIF_F_VLAN_CHALLENGED;
-
- /* Set hsr_dev's MAC address to that of mac_slave1 */
- ether_addr_copy(hsr_dev->dev_addr, hsr->slave[0]->dev_addr);
-
- /* Set required header length */
- for (i = 0; i < HSR_MAX_SLAVE; i++) {
- if (slave[i]->hard_header_len + HSR_HLEN >
- hsr_dev->hard_header_len)
- hsr_dev->hard_header_len =
- slave[i]->hard_header_len + HSR_HLEN;
- }
-
- /* MTU */
- for (i = 0; i < HSR_MAX_SLAVE; i++)
- if (slave[i]->mtu - HSR_HLEN < hsr_dev->mtu)
- hsr_dev->mtu = slave[i]->mtu - HSR_HLEN;
-
/* Make sure the 1st call to netif_carrier_on() gets through */
netif_carrier_off(hsr_dev);
- /* Promiscuity */
- for (i = 0; i < HSR_MAX_SLAVE; i++) {
- res = dev_set_promiscuity(slave[i], 1);
- if (res) {
- netdev_info(hsr_dev, "Cannot set slave promiscuity (%s, %d)\n",
- slave[i]->name, res);
- goto fail;
- }
- }
-
- for (i = 0; i < HSR_MAX_SLAVE; i++) {
- res = netdev_rx_handler_register(slave[i], hsr_handle_frame,
- hsr);
- if (res)
- goto fail;
- }
-
- /* Make sure we recognize frames from ourselves in hsr_rcv() */
- res = hsr_create_self_node(&hsr->self_node_db, hsr_dev->dev_addr,
- hsr->slave[1]->dev_addr);
- if (res < 0)
- goto fail;
-
res = register_netdevice(hsr_dev);
if (res)
- goto fail;
+ return res;
+
+ res = hsr_add_slave(hsr, slave[0], 0);
+ if (res)
+ return res;
+ res = hsr_add_slave(hsr, slave[1], 1);
+ if (res) {
+ hsr_del_slave(hsr, 0);
+ return res;
+ }
hsr->prune_timer.expires = jiffies + msecs_to_jiffies(PRUNE_PERIOD);
add_timer(&hsr->prune_timer);
@@ -626,8 +548,4 @@
register_hsr_master(hsr);
return 0;
-
-fail:
- restore_slaves(hsr_dev);
- return res;
}