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O2net: Disallow o2net accept connection request from itself.

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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 <tristan.ye@oracle.com>
Acked-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
This commit is contained in:
Tristan Ye 2010-08-02 10:00:26 +08:00 committed by Joel Becker
parent b11f1f1ab7
commit 415cf32c9c
1 changed files with 12 additions and 5 deletions
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17
fs/ocfs2/cluster/tcp.c
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@ -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 @@ out:
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;