From 415cf32c9cdfcc60f34d0ac17f29634e941ba7d2 Mon Sep 17 00:00:00 2001 From: Tristan Ye Date: Mon, 2 Aug 2010 10:00:26 +0800 Subject: [PATCH] O2net: Disallow o2net accept connection request from itself. Currently, o2net_accept_one() is allowed to accept a connection from listening node itself, such a fake connection will not be successfully established due to no handshake detected afterwards, and later end up with triggering connecting worker in a loop. We're going to fix this by treating such connection request as 'invalid', since we've got no chance of requesting connection from a node to itself in a OCFS2 cluster. The fix doesn't hurt user's scan for o2net-listener, it always gets a successful connection from userpace. Signed-off-by: Tristan Ye Acked-by: Sunil Mushran Signed-off-by: Joel Becker --- fs/ocfs2/cluster/tcp.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/fs/ocfs2/cluster/tcp.c b/fs/ocfs2/cluster/tcp.c index aa75ca3f78da..1361997cf205 100644 --- a/fs/ocfs2/cluster/tcp.c +++ b/fs/ocfs2/cluster/tcp.c @@ -1759,6 +1759,7 @@ static int o2net_accept_one(struct socket *sock) struct sockaddr_in sin; struct socket *new_sock = NULL; struct o2nm_node *node = NULL; + struct o2nm_node *local_node = NULL; struct o2net_sock_container *sc = NULL; struct o2net_node *nn; @@ -1796,11 +1797,15 @@ static int o2net_accept_one(struct socket *sock) goto out; } - if (o2nm_this_node() > node->nd_num) { - mlog(ML_NOTICE, "unexpected connect attempted from a lower " - "numbered node '%s' at " "%pI4:%d with num %u\n", - node->nd_name, &sin.sin_addr.s_addr, - ntohs(sin.sin_port), node->nd_num); + if (o2nm_this_node() >= node->nd_num) { + local_node = o2nm_get_node_by_num(o2nm_this_node()); + mlog(ML_NOTICE, "unexpected connect attempt seen at node '%s' (" + "%u, %pI4:%d) from node '%s' (%u, %pI4:%d)\n", + local_node->nd_name, local_node->nd_num, + &(local_node->nd_ipv4_address), + ntohs(local_node->nd_ipv4_port), + node->nd_name, node->nd_num, &sin.sin_addr.s_addr, + ntohs(sin.sin_port)); ret = -EINVAL; goto out; } @@ -1857,6 +1862,8 @@ static int o2net_accept_one(struct socket *sock) sock_release(new_sock); if (node) o2nm_node_put(node); + if (local_node) + o2nm_node_put(local_node); if (sc) sc_put(sc); return ret;