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aed20a53a7
We could end up executing rds_conn_shutdown before the rds_recv_worker thread, then rds_conn_shutdown -> rds_tcp_conn_shutdown can do a sock_release and set sock->sk to null, which may interleave in bad ways with rds_recv_worker, e.g., it could result in: "BUG: unable to handle kernel NULL pointer dereference at 0000000000000078" [ffff881769f6fd70] release_sock at ffffffff815f337b [ffff881769f6fd90] rds_tcp_recv at ffffffffa043c888 [rds_tcp] [ffff881769f6fdb0] rds_recv_worker at ffffffffa04a4810 [rds] [ffff881769f6fde0] process_one_work at ffffffff810a14c1 [ffff881769f6fe40] worker_thread at ffffffff810a1940 [ffff881769f6fec0] kthread at ffffffff810a6b1e Also, do not enqueue any new shutdown workq items when the connection is shutting down (this may happen for rds-tcp in softirq mode, if a FIN or CLOSE is received while the modules is in the middle of an unload) Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
190 lines
5.3 KiB
C
190 lines
5.3 KiB
C
/*
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* Copyright (c) 2006 Oracle. All rights reserved.
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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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#include <linux/kernel.h>
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#include <linux/in.h>
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#include <net/tcp.h>
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#include "rds.h"
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#include "tcp.h"
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void rds_tcp_state_change(struct sock *sk)
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{
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void (*state_change)(struct sock *sk);
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struct rds_conn_path *cp;
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struct rds_tcp_connection *tc;
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read_lock_bh(&sk->sk_callback_lock);
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cp = sk->sk_user_data;
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if (!cp) {
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state_change = sk->sk_state_change;
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goto out;
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}
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tc = cp->cp_transport_data;
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state_change = tc->t_orig_state_change;
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rdsdebug("sock %p state_change to %d\n", tc->t_sock, sk->sk_state);
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switch (sk->sk_state) {
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/* ignore connecting sockets as they make progress */
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case TCP_SYN_SENT:
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case TCP_SYN_RECV:
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break;
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case TCP_ESTABLISHED:
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/* Force the peer to reconnect so that we have the
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* TCP ports going from <smaller-ip>.<transient> to
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* <larger-ip>.<RDS_TCP_PORT>. We avoid marking the
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* RDS connection as RDS_CONN_UP until the reconnect,
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* to avoid RDS datagram loss.
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*/
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if (!IS_CANONICAL(cp->cp_conn->c_laddr, cp->cp_conn->c_faddr) &&
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rds_conn_path_transition(cp, RDS_CONN_CONNECTING,
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RDS_CONN_ERROR)) {
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rds_conn_path_drop(cp, false);
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} else {
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rds_connect_path_complete(cp, RDS_CONN_CONNECTING);
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}
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break;
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case TCP_CLOSE_WAIT:
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case TCP_CLOSE:
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rds_conn_path_drop(cp, false);
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default:
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break;
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}
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out:
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read_unlock_bh(&sk->sk_callback_lock);
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state_change(sk);
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}
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int rds_tcp_conn_path_connect(struct rds_conn_path *cp)
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{
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struct socket *sock = NULL;
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struct sockaddr_in src, dest;
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int ret;
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struct rds_connection *conn = cp->cp_conn;
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struct rds_tcp_connection *tc = cp->cp_transport_data;
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/* for multipath rds,we only trigger the connection after
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* the handshake probe has determined the number of paths.
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*/
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if (cp->cp_index > 0 && cp->cp_conn->c_npaths < 2)
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return -EAGAIN;
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mutex_lock(&tc->t_conn_path_lock);
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if (rds_conn_path_up(cp)) {
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mutex_unlock(&tc->t_conn_path_lock);
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return 0;
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}
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ret = sock_create_kern(rds_conn_net(conn), PF_INET,
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SOCK_STREAM, IPPROTO_TCP, &sock);
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if (ret < 0)
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goto out;
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rds_tcp_tune(sock);
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src.sin_family = AF_INET;
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src.sin_addr.s_addr = (__force u32)conn->c_laddr;
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src.sin_port = (__force u16)htons(0);
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ret = sock->ops->bind(sock, (struct sockaddr *)&src, sizeof(src));
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if (ret) {
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rdsdebug("bind failed with %d at address %pI4\n",
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ret, &conn->c_laddr);
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goto out;
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}
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dest.sin_family = AF_INET;
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dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
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dest.sin_port = (__force u16)htons(RDS_TCP_PORT);
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/*
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* once we call connect() we can start getting callbacks and they
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* own the socket
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*/
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rds_tcp_set_callbacks(sock, cp);
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ret = sock->ops->connect(sock, (struct sockaddr *)&dest, sizeof(dest),
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O_NONBLOCK);
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rdsdebug("connect to address %pI4 returned %d\n", &conn->c_faddr, ret);
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if (ret == -EINPROGRESS)
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ret = 0;
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if (ret == 0) {
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rds_tcp_keepalive(sock);
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sock = NULL;
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} else {
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rds_tcp_restore_callbacks(sock, cp->cp_transport_data);
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}
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out:
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mutex_unlock(&tc->t_conn_path_lock);
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if (sock)
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sock_release(sock);
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return ret;
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}
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/*
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* Before killing the tcp socket this needs to serialize with callbacks. The
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* caller has already grabbed the sending sem so we're serialized with other
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* senders.
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*
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* TCP calls the callbacks with the sock lock so we hold it while we reset the
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* callbacks to those set by TCP. Our callbacks won't execute again once we
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* hold the sock lock.
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*/
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void rds_tcp_conn_path_shutdown(struct rds_conn_path *cp)
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{
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struct rds_tcp_connection *tc = cp->cp_transport_data;
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struct socket *sock = tc->t_sock;
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rdsdebug("shutting down conn %p tc %p sock %p\n",
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cp->cp_conn, tc, sock);
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if (sock) {
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if (cp->cp_conn->c_destroy_in_prog)
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rds_tcp_set_linger(sock);
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sock->ops->shutdown(sock, RCV_SHUTDOWN | SEND_SHUTDOWN);
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lock_sock(sock->sk);
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rds_tcp_restore_callbacks(sock, tc); /* tc->tc_sock = NULL */
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release_sock(sock->sk);
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sock_release(sock);
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}
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if (tc->t_tinc) {
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rds_inc_put(&tc->t_tinc->ti_inc);
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tc->t_tinc = NULL;
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}
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tc->t_tinc_hdr_rem = sizeof(struct rds_header);
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tc->t_tinc_data_rem = 0;
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}
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