This is a note to let you know that I've just added the patch titled
tipc: fix link attribute propagation bug
to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: tipc-fix-link-attribute-propagation-bug.patch and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From d01332f1acacc0cb43a61f4244dd2b846d4cd585 Mon Sep 17 00:00:00 2001
From: Richard Alpe richard.alpe@ericsson.com Date: Mon, 1 Feb 2016 08:19:56 +0100 Subject: tipc: fix link attribute propagation bug
From: Richard Alpe richard.alpe@ericsson.com
commit d01332f1acacc0cb43a61f4244dd2b846d4cd585 upstream.
Changing certain link attributes (link tolerance and link priority) from the TIPC management tool is supposed to automatically take effect at both endpoints of the affected link.
Currently the media address is not instantiated for the link and is used uninstantiated when crafting protocol messages designated for the peer endpoint. This means that changing a link property currently results in the property being changed on the local machine but the protocol message designated for the peer gets lost. Resulting in property discrepancy between the endpoints.
In this patch we resolve this by using the media address from the link entry and using the bearer transmit function to send it. Hence, we can now eliminate the redundant function tipc_link_prot_xmit() and the redundant field tipc_link::media_addr.
Fixes: 2af5ae372a4b (tipc: clean up unused code and structures) Reviewed-by: Jon Maloy jon.maloy@ericsson.com Reported-by: Jason Hu huzhijiang@gmail.com Signed-off-by: Richard Alpe richard.alpe@ericsson.com Signed-off-by: David S. Miller davem@davemloft.net [backported to 4.4 by Tommi Rantala] Signed-off-by: Tommi Rantala tommi.t.rantala@nokia.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/tipc/link.c | 28 ++++++---------------------- net/tipc/link.h | 1 - 2 files changed, 6 insertions(+), 23 deletions(-)
--- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -1084,25 +1084,6 @@ drop: return rc; }
-/* - * Send protocol message to the other endpoint. - */ -void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ, int probe_msg, - u32 gap, u32 tolerance, u32 priority) -{ - struct sk_buff *skb = NULL; - struct sk_buff_head xmitq; - - __skb_queue_head_init(&xmitq); - tipc_link_build_proto_msg(l, msg_typ, probe_msg, gap, - tolerance, priority, &xmitq); - skb = __skb_dequeue(&xmitq); - if (!skb) - return; - tipc_bearer_xmit_skb(l->net, l->bearer_id, skb, l->media_addr); - l->rcv_unacked = 0; -} - static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, u16 rcvgap, int tolerance, int priority, struct sk_buff_head *xmitq) @@ -1636,9 +1617,12 @@ int tipc_nl_link_set(struct sk_buff *skb char *name; struct tipc_link *link; struct tipc_node *node; + struct sk_buff_head xmitq; struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; struct net *net = sock_net(skb->sk);
+ __skb_queue_head_init(&xmitq); + if (!info->attrs[TIPC_NLA_LINK]) return -EINVAL;
@@ -1683,14 +1667,14 @@ int tipc_nl_link_set(struct sk_buff *skb
tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); link->tolerance = tol; - tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0); + tipc_link_build_proto_msg(link, STATE_MSG, 0, 0, tol, 0, &xmitq); } if (props[TIPC_NLA_PROP_PRIO]) { u32 prio;
prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); link->priority = prio; - tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio); + tipc_link_build_proto_msg(link, STATE_MSG, 0, 0, 0, prio, &xmitq); } if (props[TIPC_NLA_PROP_WIN]) { u32 win; @@ -1702,7 +1686,7 @@ int tipc_nl_link_set(struct sk_buff *skb
out: tipc_node_unlock(node); - + tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr); return res; }
--- a/net/tipc/link.h +++ b/net/tipc/link.h @@ -153,7 +153,6 @@ struct tipc_stats { struct tipc_link { u32 addr; char name[TIPC_MAX_LINK_NAME]; - struct tipc_media_addr *media_addr; struct net *net;
/* Management and link supervision data */
Patches currently in stable-queue which might be from richard.alpe@ericsson.com are
queue-4.4/tipc-fix-link-attribute-propagation-bug.patch