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authorJon Maloy <jon.maloy@ericsson.com>2018-07-10 01:07:35 +0200
committerDavid S. Miller <davem@davemloft.net>2018-07-11 23:06:14 -0700
commit9012de5089560136b849b920ad038b96160ed8f6 (patch)
tree20261a0c6e074ca936878835b64a04294ca3af52 /net/tipc/node.c
parente32f55f373217001187ff171e75c5dfbb251f633 (diff)
tipc: add sequence number check for link STATE messages
Some switch infrastructures produce huge amounts of packet duplicates. This becomes a problem if those messages are STATE/NACK protocol messages, causing unnecessary retransmissions of already accepted packets. We now introduce a unique sequence number per STATE protocol message so that duplicates can be identified and ignored. This will also be useful when tracing such cases, and to avert replay attacks when TIPC is encrypted. For compatibility reasons we have to introduce a new capability flag TIPC_LINK_PROTO_SEQNO to handle this new feature. Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc/node.c')
-rw-r--r--net/tipc/node.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/tipc/node.c b/net/tipc/node.c
index cfdbaf479fd1..1cdb176798f7 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -363,6 +363,8 @@ static struct tipc_node *tipc_node_create(struct net *net, u32 addr,
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_node *n, *temp_node;
+ struct tipc_link *l;
+ int bearer_id;
int i;
spin_lock_bh(&tn->node_list_lock);
@@ -370,6 +372,11 @@ static struct tipc_node *tipc_node_create(struct net *net, u32 addr,
if (n) {
/* Same node may come back with new capabilities */
n->capabilities = capabilities;
+ for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
+ l = n->links[bearer_id].link;
+ if (l)
+ tipc_link_update_caps(l, capabilities);
+ }
goto exit;
}
n = kzalloc(sizeof(*n), GFP_ATOMIC);