diff options
| -rw-r--r-- | net/tipc/bearer.c | 50 | ||||
| -rw-r--r-- | net/tipc/msg.h | 5 |
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); |