summaryrefslogtreecommitdiff
path: root/net/tipc
diff options
context:
space:
mode:
Diffstat (limited to 'net/tipc')
-rw-r--r--net/tipc/bearer.c50
-rw-r--r--net/tipc/msg.h5
2 files changed, 38 insertions, 17 deletions
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 20566e9a1369..6f11c62bc8f9 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -337,23 +337,16 @@ static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
*/
static void bearer_disable(struct net *net, struct tipc_bearer *b)
{
- struct tipc_net *tn = net_generic(net, tipc_net_id);
- u32 i;
+ struct tipc_net *tn = tipc_net(net);
+ int bearer_id = b->identity;
pr_info("Disabling bearer <%s>\n", b->name);
b->media->disable_media(b);
-
- tipc_node_delete_links(net, b->identity);
+ tipc_node_delete_links(net, bearer_id);
RCU_INIT_POINTER(b->media_ptr, NULL);
if (b->link_req)
tipc_disc_delete(b->link_req);
-
- for (i = 0; i < MAX_BEARERS; i++) {
- if (b == rtnl_dereference(tn->bearer_list[i])) {
- RCU_INIT_POINTER(tn->bearer_list[i], NULL);
- break;
- }
- }
+ RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
kfree_rcu(b, rcu);
}
@@ -396,7 +389,7 @@ void tipc_disable_l2_media(struct tipc_bearer *b)
/**
* tipc_l2_send_msg - send a TIPC packet out over an L2 interface
- * @buf: the packet to be sent
+ * @skb: the packet to be sent
* @b: the bearer through which the packet is to be sent
* @dest: peer destination address
*/
@@ -405,17 +398,21 @@ int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
{
struct net_device *dev;
int delta;
+ void *tipc_ptr;
dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
if (!dev)
return 0;
+ /* Send RESET message even if bearer is detached from device */
+ tipc_ptr = rtnl_dereference(dev->tipc_ptr);
+ if (unlikely(!tipc_ptr && !msg_is_reset(buf_msg(skb))))
+ goto drop;
+
delta = dev->hard_header_len - skb_headroom(skb);
if ((delta > 0) &&
- pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
- kfree_skb(skb);
- return 0;
- }
+ pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC))
+ goto drop;
skb_reset_network_header(skb);
skb->dev = dev;
@@ -424,6 +421,9 @@ int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
dev->dev_addr, skb->len);
dev_queue_xmit(skb);
return 0;
+drop:
+ kfree_skb(skb);
+ return 0;
}
int tipc_bearer_mtu(struct net *net, u32 bearer_id)
@@ -549,9 +549,18 @@ static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct net *net = dev_net(dev);
+ struct tipc_net *tn = tipc_net(net);
struct tipc_bearer *b;
+ int i;
b = rtnl_dereference(dev->tipc_ptr);
+ if (!b) {
+ for (i = 0; i < MAX_BEARERS; b = NULL, i++) {
+ b = rtnl_dereference(tn->bearer_list[i]);
+ if (b && (b->media_ptr == dev))
+ break;
+ }
+ }
if (!b)
return NOTIFY_DONE;
@@ -561,13 +570,20 @@ static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
case NETDEV_CHANGE:
if (netif_carrier_ok(dev))
break;
+ case NETDEV_UP:
+ rcu_assign_pointer(dev->tipc_ptr, b);
+ break;
case NETDEV_GOING_DOWN:
+ RCU_INIT_POINTER(dev->tipc_ptr, NULL);
+ synchronize_net();
+ tipc_reset_bearer(net, b);
+ break;
case NETDEV_CHANGEMTU:
tipc_reset_bearer(net, b);
break;
case NETDEV_CHANGEADDR:
b->media->raw2addr(b, &b->addr,
- (char *)dev->dev_addr);
+ (char *)dev->dev_addr);
tipc_reset_bearer(net, b);
break;
case NETDEV_UNREGISTER:
diff --git a/net/tipc/msg.h b/net/tipc/msg.h
index 55778a0aebf3..f34f639df643 100644
--- a/net/tipc/msg.h
+++ b/net/tipc/msg.h
@@ -779,6 +779,11 @@ static inline bool msg_peer_node_is_up(struct tipc_msg *m)
return msg_redundant_link(m);
}
+static inline bool msg_is_reset(struct tipc_msg *hdr)
+{
+ return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
+}
+
struct sk_buff *tipc_buf_acquire(u32 size);
bool tipc_msg_validate(struct sk_buff *skb);
bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);