diff options
| author | Tristan Ye <tristan.ye@oracle.com> | 2010-08-02 04:00:26 +0200 |
|---|---|---|
| committer | Joel Becker <joel.becker@oracle.com> | 2010-08-07 19:50:33 +0200 |
| commit | 415cf32c9cdfcc60f34d0ac17f29634e941ba7d2 (patch) | |
| tree | 56675497e07772f99bd375a9f74542e3a12f2f37 /fs | |
| parent | ocfs2/dlm: remove potential deadlock -V3 (diff) | |
| download | linux-415cf32c9cdfcc60f34d0ac17f29634e941ba7d2.tar.xz linux-415cf32c9cdfcc60f34d0ac17f29634e941ba7d2.zip | |
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 <tristan.ye@oracle.com>
Acked-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ocfs2/cluster/tcp.c | 17 |
1 files 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 @@ 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; |