2009-02-24 22:30:37 +07:00
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/*
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2018-07-24 10:51:21 +07:00
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* Copyright (c) 2009, 2018 Oracle and/or its affiliates. All rights reserved.
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2009-02-24 22:30:37 +07:00
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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2011-05-27 20:12:25 +07:00
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#include <linux/module.h>
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2009-02-24 22:30:37 +07:00
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#include <rdma/rdma_cm.h>
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2016-06-13 23:44:26 +07:00
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#include "rds_single_path.h"
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2009-02-24 22:30:37 +07:00
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#include "rdma_transport.h"
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2015-08-23 05:45:35 +07:00
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#include "ib.h"
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2009-02-24 22:30:37 +07:00
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2018-07-24 10:51:22 +07:00
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/* Global IPv4 and IPv6 RDS RDMA listener cm_id */
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2009-04-09 21:09:37 +07:00
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static struct rdma_cm_id *rds_rdma_listen_id;
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2018-07-31 12:48:42 +07:00
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#if IS_ENABLED(CONFIG_IPV6)
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2018-07-24 10:51:22 +07:00
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static struct rdma_cm_id *rds6_rdma_listen_id;
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2018-07-31 12:48:42 +07:00
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#endif
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2009-02-24 22:30:37 +07:00
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2019-08-24 08:04:16 +07:00
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/* Per IB specification 7.7.3, service level is a 4-bit field. */
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#define TOS_TO_SL(tos) ((tos) & 0xF)
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2018-07-24 10:51:21 +07:00
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static int rds_rdma_cm_event_handler_cmn(struct rdma_cm_id *cm_id,
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struct rdma_cm_event *event,
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bool isv6)
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2009-02-24 22:30:37 +07:00
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{
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/* this can be null in the listening path */
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struct rds_connection *conn = cm_id->context;
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struct rds_transport *trans;
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int ret = 0;
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2018-10-24 10:09:00 +07:00
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int *err;
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u8 len;
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2009-02-24 22:30:37 +07:00
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2010-08-04 03:52:47 +07:00
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rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id,
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2015-05-18 17:40:33 +07:00
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event->event, rdma_event_msg(event->event));
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2009-02-24 22:30:37 +07:00
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2016-03-02 06:20:42 +07:00
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if (cm_id->device->node_type == RDMA_NODE_IB_CA)
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2009-02-24 22:30:37 +07:00
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trans = &rds_ib_transport;
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/* Prevent shutdown from tearing down the connection
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* while we're executing. */
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if (conn) {
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mutex_lock(&conn->c_cm_lock);
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/* If the connection is being shut down, bail out
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* right away. We return 0 so cm_id doesn't get
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* destroyed prematurely */
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if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) {
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/* Reject incoming connections while we're tearing
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* down an existing one. */
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if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
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ret = 1;
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goto out;
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}
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}
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switch (event->event) {
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case RDMA_CM_EVENT_CONNECT_REQUEST:
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2018-07-24 10:51:21 +07:00
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ret = trans->cm_handle_connect(cm_id, event, isv6);
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2009-02-24 22:30:37 +07:00
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break;
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case RDMA_CM_EVENT_ADDR_RESOLVED:
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2018-10-13 21:13:23 +07:00
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rdma_set_service_type(cm_id, conn->c_tos);
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2009-02-24 22:30:37 +07:00
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/* XXX do we need to clean up if this fails? */
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ret = rdma_resolve_route(cm_id,
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RDS_RDMA_RESOLVE_TIMEOUT_MS);
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break;
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case RDMA_CM_EVENT_ROUTE_RESOLVED:
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2015-08-23 05:45:35 +07:00
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/* Connection could have been dropped so make sure the
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* cm_id is valid before proceeding
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*/
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if (conn) {
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struct rds_ib_connection *ibic;
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ibic = conn->c_transport_data;
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2019-08-24 08:04:16 +07:00
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if (ibic && ibic->i_cm_id == cm_id) {
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cm_id->route.path_rec[0].sl =
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TOS_TO_SL(conn->c_tos);
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2018-07-24 10:51:21 +07:00
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ret = trans->cm_initiate_connect(cm_id, isv6);
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2019-08-24 08:04:16 +07:00
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} else {
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2015-08-23 05:45:35 +07:00
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rds_conn_drop(conn);
|
2019-08-24 08:04:16 +07:00
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}
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2015-08-23 05:45:35 +07:00
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}
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2009-02-24 22:30:37 +07:00
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break;
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case RDMA_CM_EVENT_ESTABLISHED:
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2019-07-26 21:17:05 +07:00
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if (conn)
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trans->cm_connect_complete(conn, event);
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2009-02-24 22:30:37 +07:00
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break;
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2016-10-27 02:36:48 +07:00
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case RDMA_CM_EVENT_REJECTED:
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2018-10-24 10:09:00 +07:00
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if (!conn)
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break;
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err = (int *)rdma_consumer_reject_data(cm_id, event, &len);
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rds: Accept peer connection reject messages due to incompatible version
Prior to
commit d021fabf525ff ("rds: rdma: add consumer reject")
function "rds_rdma_cm_event_handler_cmn" would always honor a rejected
connection attempt by issuing a "rds_conn_drop".
The commit mentioned above added a "break", eliminating
the "fallthrough" case and made the "rds_conn_drop" rather conditional:
Now it only happens if a "consumer defined" reject (i.e. "rdma_reject")
carries an integer-value of "1" inside "private_data":
if (!conn)
break;
err = (int *)rdma_consumer_reject_data(cm_id, event, &len);
if (!err || (err && ((*err) == RDS_RDMA_REJ_INCOMPAT))) {
pr_warn("RDS/RDMA: conn <%pI6c, %pI6c> rejected, dropping connection\n",
&conn->c_laddr, &conn->c_faddr);
conn->c_proposed_version = RDS_PROTOCOL_COMPAT_VERSION;
rds_conn_drop(conn);
}
rdsdebug("Connection rejected: %s\n",
rdma_reject_msg(cm_id, event->status));
break;
/* FALLTHROUGH */
A number of issues are worth mentioning here:
#1) Previous versions of the RDS code simply rejected a connection
by calling "rdma_reject(cm_id, NULL, 0);"
So the value of the payload in "private_data" will not be "1",
but "0".
#2) Now the code has become dependent on host byte order and sizing.
If one peer is big-endian, the other is little-endian,
or there's a difference in sizeof(int) (e.g. ILP64 vs LP64),
the *err check does not work as intended.
#3) There is no check for "len" to see if the data behind *err is even valid.
Luckily, it appears that the "rdma_reject(cm_id, NULL, 0)" will always
carry 148 bytes of zeroized payload.
But that should probably not be relied upon here.
#4) With the added "break;",
we might as well drop the misleading "/* FALLTHROUGH */" comment.
This commit does _not_ address issue #2, as the sender would have to
agree on a byte order as well.
Here is the sequence of messages in this observed error-scenario:
Host-A is pre-QoS changes (excluding the commit mentioned above)
Host-B is post-QoS changes (including the commit mentioned above)
#1 Host-B
issues a connection request via function "rds_conn_path_transition"
connection state transitions to "RDS_CONN_CONNECTING"
#2 Host-A
rejects the incompatible connection request (from #1)
It does so by calling "rdma_reject(cm_id, NULL, 0);"
#3 Host-B
receives an "RDMA_CM_EVENT_REJECTED" event (from #2)
But since the code is changed in the way described above,
it won't drop the connection here, simply because "*err == 0".
#4 Host-A
issues a connection request
#5 Host-B
receives an "RDMA_CM_EVENT_CONNECT_REQUEST" event
and ends up calling "rds_ib_cm_handle_connect".
But since the state is already in "RDS_CONN_CONNECTING"
(as of #1) it will end up issuing a "rdma_reject" without
dropping the connection:
if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
/* Wait and see - our connect may still be succeeding */
rds_ib_stats_inc(s_ib_connect_raced);
}
goto out;
#6 Host-A
receives an "RDMA_CM_EVENT_REJECTED" event (from #5),
drops the connection and tries again (goto #4) until it gives up.
Tested-by: Zhu Yanjun <yanjun.zhu@oracle.com>
Signed-off-by: Gerd Rausch <gerd.rausch@oracle.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
2019-06-27 23:21:44 +07:00
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if (!err ||
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(err && len >= sizeof(*err) &&
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((*err) <= RDS_RDMA_REJ_INCOMPAT))) {
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2018-10-24 10:09:00 +07:00
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pr_warn("RDS/RDMA: conn <%pI6c, %pI6c> rejected, dropping connection\n",
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&conn->c_laddr, &conn->c_faddr);
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2019-06-29 05:38:58 +07:00
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if (!conn->c_tos)
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conn->c_proposed_version = RDS_PROTOCOL_COMPAT_VERSION;
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|
2018-10-24 10:09:00 +07:00
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rds_conn_drop(conn);
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}
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2016-10-27 02:36:48 +07:00
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rdsdebug("Connection rejected: %s\n",
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rdma_reject_msg(cm_id, event->status));
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2018-10-24 10:09:00 +07:00
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break;
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2009-02-24 22:30:37 +07:00
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case RDMA_CM_EVENT_ADDR_ERROR:
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case RDMA_CM_EVENT_ROUTE_ERROR:
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case RDMA_CM_EVENT_CONNECT_ERROR:
|
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case RDMA_CM_EVENT_UNREACHABLE:
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case RDMA_CM_EVENT_DEVICE_REMOVAL:
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case RDMA_CM_EVENT_ADDR_CHANGE:
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if (conn)
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rds_conn_drop(conn);
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break;
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case RDMA_CM_EVENT_DISCONNECTED:
|
2019-07-26 21:17:05 +07:00
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if (!conn)
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break;
|
2010-03-11 20:50:02 +07:00
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rdsdebug("DISCONNECT event - dropping connection "
|
2018-07-24 10:51:21 +07:00
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"%pI6c->%pI6c\n", &conn->c_laddr,
|
2009-02-24 22:30:37 +07:00
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&conn->c_faddr);
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rds_conn_drop(conn);
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break;
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|
2016-03-02 06:20:50 +07:00
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case RDMA_CM_EVENT_TIMEWAIT_EXIT:
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|
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if (conn) {
|
2018-07-24 10:51:21 +07:00
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pr_info("RDS: RDMA_CM_EVENT_TIMEWAIT_EXIT event: dropping connection %pI6c->%pI6c\n",
|
2016-03-02 06:20:50 +07:00
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&conn->c_laddr, &conn->c_faddr);
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rds_conn_drop(conn);
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}
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break;
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|
2009-02-24 22:30:37 +07:00
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default:
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/* things like device disconnect? */
|
2010-08-04 03:52:47 +07:00
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printk(KERN_ERR "RDS: unknown event %u (%s)!\n",
|
2015-05-18 17:40:33 +07:00
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event->event, rdma_event_msg(event->event));
|
2009-02-24 22:30:37 +07:00
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break;
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}
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out:
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if (conn)
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mutex_unlock(&conn->c_cm_lock);
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|
2010-08-04 03:52:47 +07:00
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rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event,
|
2015-05-18 17:40:33 +07:00
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rdma_event_msg(event->event), ret);
|
2009-02-24 22:30:37 +07:00
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return ret;
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}
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|
2018-07-24 10:51:21 +07:00
|
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int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
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struct rdma_cm_event *event)
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|
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{
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return rds_rdma_cm_event_handler_cmn(cm_id, event, false);
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|
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}
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|
2018-07-31 12:48:42 +07:00
|
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#if IS_ENABLED(CONFIG_IPV6)
|
2018-07-24 10:51:22 +07:00
|
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int rds6_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
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struct rdma_cm_event *event)
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|
|
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{
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|
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return rds_rdma_cm_event_handler_cmn(cm_id, event, true);
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}
|
2018-07-31 12:48:42 +07:00
|
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#endif
|
2018-07-24 10:51:22 +07:00
|
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|
2018-07-24 10:51:21 +07:00
|
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static int rds_rdma_listen_init_common(rdma_cm_event_handler handler,
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|
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struct sockaddr *sa,
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struct rdma_cm_id **ret_cm_id)
|
2009-02-24 22:30:37 +07:00
|
|
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{
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|
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struct rdma_cm_id *cm_id;
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int ret;
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|
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|
2018-07-24 10:51:21 +07:00
|
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|
cm_id = rdma_create_id(&init_net, handler, NULL,
|
2015-10-22 19:20:10 +07:00
|
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|
RDMA_PS_TCP, IB_QPT_RC);
|
2009-02-24 22:30:37 +07:00
|
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if (IS_ERR(cm_id)) {
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|
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ret = PTR_ERR(cm_id);
|
2009-07-17 20:13:26 +07:00
|
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printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
|
2009-02-24 22:30:37 +07:00
|
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"rdma_create_id() returned %d\n", ret);
|
2010-04-22 06:55:27 +07:00
|
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return ret;
|
2009-02-24 22:30:37 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* XXX I bet this binds the cm_id to a device. If we want to support
|
|
|
|
* fail-over we'll have to take this into consideration.
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|
|
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*/
|
2018-07-24 10:51:21 +07:00
|
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ret = rdma_bind_addr(cm_id, sa);
|
2009-02-24 22:30:37 +07:00
|
|
|
if (ret) {
|
2009-07-17 20:13:26 +07:00
|
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|
printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
|
2009-02-24 22:30:37 +07:00
|
|
|
"rdma_bind_addr() returned %d\n", ret);
|
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goto out;
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|
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}
|
|
|
|
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ret = rdma_listen(cm_id, 128);
|
|
|
|
if (ret) {
|
2009-07-17 20:13:26 +07:00
|
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|
printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
|
2009-02-24 22:30:37 +07:00
|
|
|
"rdma_listen() returned %d\n", ret);
|
|
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goto out;
|
|
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|
}
|
|
|
|
|
|
|
|
rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
|
|
|
|
|
2018-07-24 10:51:21 +07:00
|
|
|
*ret_cm_id = cm_id;
|
2009-02-24 22:30:37 +07:00
|
|
|
cm_id = NULL;
|
|
|
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out:
|
|
|
|
if (cm_id)
|
|
|
|
rdma_destroy_id(cm_id);
|
|
|
|
return ret;
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|
|
|
}
|
|
|
|
|
2018-07-24 10:51:21 +07:00
|
|
|
/* Initialize the RDS RDMA listeners. We create two listeners for
|
|
|
|
* compatibility reason. The one on RDS_PORT is used for IPv4
|
|
|
|
* requests only. The one on RDS_CM_PORT is used for IPv6 requests
|
|
|
|
* only. So only IPv6 enabled RDS module will communicate using this
|
|
|
|
* port.
|
|
|
|
*/
|
|
|
|
static int rds_rdma_listen_init(void)
|
|
|
|
{
|
|
|
|
int ret;
|
2018-07-31 12:48:42 +07:00
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
2018-07-24 10:51:22 +07:00
|
|
|
struct sockaddr_in6 sin6;
|
2018-07-31 12:48:42 +07:00
|
|
|
#endif
|
2018-07-24 10:51:21 +07:00
|
|
|
struct sockaddr_in sin;
|
|
|
|
|
|
|
|
sin.sin_family = PF_INET;
|
|
|
|
sin.sin_addr.s_addr = htonl(INADDR_ANY);
|
|
|
|
sin.sin_port = htons(RDS_PORT);
|
|
|
|
ret = rds_rdma_listen_init_common(rds_rdma_cm_event_handler,
|
|
|
|
(struct sockaddr *)&sin,
|
|
|
|
&rds_rdma_listen_id);
|
2018-07-24 10:51:22 +07:00
|
|
|
if (ret != 0)
|
|
|
|
return ret;
|
|
|
|
|
2018-07-31 12:48:42 +07:00
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
2018-07-24 10:51:22 +07:00
|
|
|
sin6.sin6_family = PF_INET6;
|
|
|
|
sin6.sin6_addr = in6addr_any;
|
|
|
|
sin6.sin6_port = htons(RDS_CM_PORT);
|
|
|
|
sin6.sin6_scope_id = 0;
|
|
|
|
sin6.sin6_flowinfo = 0;
|
|
|
|
ret = rds_rdma_listen_init_common(rds6_rdma_cm_event_handler,
|
|
|
|
(struct sockaddr *)&sin6,
|
|
|
|
&rds6_rdma_listen_id);
|
|
|
|
/* Keep going even when IPv6 is not enabled in the system. */
|
|
|
|
if (ret != 0)
|
|
|
|
rdsdebug("Cannot set up IPv6 RDMA listener\n");
|
2018-07-31 12:48:42 +07:00
|
|
|
#endif
|
2018-07-24 10:51:22 +07:00
|
|
|
return 0;
|
2018-07-24 10:51:21 +07:00
|
|
|
}
|
|
|
|
|
2009-02-24 22:30:37 +07:00
|
|
|
static void rds_rdma_listen_stop(void)
|
|
|
|
{
|
2009-04-09 21:09:37 +07:00
|
|
|
if (rds_rdma_listen_id) {
|
|
|
|
rdsdebug("cm %p\n", rds_rdma_listen_id);
|
|
|
|
rdma_destroy_id(rds_rdma_listen_id);
|
|
|
|
rds_rdma_listen_id = NULL;
|
2009-02-24 22:30:37 +07:00
|
|
|
}
|
2018-07-31 12:48:42 +07:00
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
2018-07-24 10:51:22 +07:00
|
|
|
if (rds6_rdma_listen_id) {
|
|
|
|
rdsdebug("cm %p\n", rds6_rdma_listen_id);
|
|
|
|
rdma_destroy_id(rds6_rdma_listen_id);
|
|
|
|
rds6_rdma_listen_id = NULL;
|
|
|
|
}
|
2018-07-31 12:48:42 +07:00
|
|
|
#endif
|
2009-02-24 22:30:37 +07:00
|
|
|
}
|
|
|
|
|
2010-10-19 15:08:33 +07:00
|
|
|
static int rds_rdma_init(void)
|
2009-02-24 22:30:37 +07:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2016-07-05 06:29:13 +07:00
|
|
|
ret = rds_ib_init();
|
2009-02-24 22:30:37 +07:00
|
|
|
if (ret)
|
|
|
|
goto out;
|
|
|
|
|
2016-07-05 06:29:13 +07:00
|
|
|
ret = rds_rdma_listen_init();
|
2009-02-24 22:30:37 +07:00
|
|
|
if (ret)
|
2016-07-05 06:29:13 +07:00
|
|
|
rds_ib_exit();
|
2009-02-24 22:30:37 +07:00
|
|
|
out:
|
|
|
|
return ret;
|
|
|
|
}
|
2009-08-21 19:28:33 +07:00
|
|
|
module_init(rds_rdma_init);
|
2009-02-24 22:30:37 +07:00
|
|
|
|
2010-10-19 15:08:33 +07:00
|
|
|
static void rds_rdma_exit(void)
|
2009-02-24 22:30:37 +07:00
|
|
|
{
|
|
|
|
/* stop listening first to ensure no new connections are attempted */
|
|
|
|
rds_rdma_listen_stop();
|
|
|
|
rds_ib_exit();
|
|
|
|
}
|
2009-08-21 19:28:33 +07:00
|
|
|
module_exit(rds_rdma_exit);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
|
2016-03-02 06:20:42 +07:00
|
|
|
MODULE_DESCRIPTION("RDS: IB transport");
|
2009-08-21 19:28:33 +07:00
|
|
|
MODULE_LICENSE("Dual BSD/GPL");
|