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synced 2024-08-23 09:19:51 +00:00
![Tetsuo Handa](/assets/img/avatar_default.png)
Eric Dumazet is reporting addition on 0 problem at rds_tcp_tune(), for
delayed works queued in rds_wq might be invoked after a net namespace's
refcount already reached 0.
Since rds_tcp_exit_net() from cleanup_net() calls flush_workqueue(rds_wq),
it is guaranteed that we can instead use maybe_get_net() from delayed work
functions until rds_tcp_exit_net() returns.
Note that I'm not convinced that all works which might access a net
namespace are already queued in rds_wq by the moment rds_tcp_exit_net()
calls flush_workqueue(rds_wq). If some race is there, rds_tcp_exit_net()
will fail to wait for work functions, and kmem_cache_free() could be
called from net_free() before maybe_get_net() is called from
rds_tcp_tune().
Reported-by: Eric Dumazet <edumazet@google.com>
Fixes: 3a58f13a88
("net: rds: acquire refcount on TCP sockets")
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/41d09faf-bc78-1a87-dfd1-c6d1b5984b61@I-love.SAKURA.ne.jp
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
754 lines
21 KiB
C
754 lines
21 KiB
C
/*
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* Copyright (c) 2006, 2018 Oracle and/or its affiliates. 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/slab.h>
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#include <linux/in.h>
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#include <linux/module.h>
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#include <net/tcp.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <net/addrconf.h>
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#include "rds.h"
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#include "tcp.h"
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/* only for info exporting */
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static DEFINE_SPINLOCK(rds_tcp_tc_list_lock);
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static LIST_HEAD(rds_tcp_tc_list);
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/* rds_tcp_tc_count counts only IPv4 connections.
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* rds6_tcp_tc_count counts both IPv4 and IPv6 connections.
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*/
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static unsigned int rds_tcp_tc_count;
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#if IS_ENABLED(CONFIG_IPV6)
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static unsigned int rds6_tcp_tc_count;
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#endif
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/* Track rds_tcp_connection structs so they can be cleaned up */
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static DEFINE_SPINLOCK(rds_tcp_conn_lock);
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static LIST_HEAD(rds_tcp_conn_list);
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static atomic_t rds_tcp_unloading = ATOMIC_INIT(0);
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static struct kmem_cache *rds_tcp_conn_slab;
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static int rds_tcp_skbuf_handler(struct ctl_table *ctl, int write,
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void *buffer, size_t *lenp, loff_t *fpos);
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static int rds_tcp_min_sndbuf = SOCK_MIN_SNDBUF;
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static int rds_tcp_min_rcvbuf = SOCK_MIN_RCVBUF;
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static struct ctl_table rds_tcp_sysctl_table[] = {
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#define RDS_TCP_SNDBUF 0
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{
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.procname = "rds_tcp_sndbuf",
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/* data is per-net pointer */
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = rds_tcp_skbuf_handler,
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.extra1 = &rds_tcp_min_sndbuf,
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},
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#define RDS_TCP_RCVBUF 1
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{
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.procname = "rds_tcp_rcvbuf",
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/* data is per-net pointer */
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = rds_tcp_skbuf_handler,
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.extra1 = &rds_tcp_min_rcvbuf,
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},
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{ }
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};
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u32 rds_tcp_write_seq(struct rds_tcp_connection *tc)
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{
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/* seq# of the last byte of data in tcp send buffer */
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return tcp_sk(tc->t_sock->sk)->write_seq;
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}
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u32 rds_tcp_snd_una(struct rds_tcp_connection *tc)
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{
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return tcp_sk(tc->t_sock->sk)->snd_una;
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}
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void rds_tcp_restore_callbacks(struct socket *sock,
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struct rds_tcp_connection *tc)
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{
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rdsdebug("restoring sock %p callbacks from tc %p\n", sock, tc);
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write_lock_bh(&sock->sk->sk_callback_lock);
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/* done under the callback_lock to serialize with write_space */
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spin_lock(&rds_tcp_tc_list_lock);
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list_del_init(&tc->t_list_item);
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#if IS_ENABLED(CONFIG_IPV6)
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rds6_tcp_tc_count--;
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#endif
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if (!tc->t_cpath->cp_conn->c_isv6)
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rds_tcp_tc_count--;
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spin_unlock(&rds_tcp_tc_list_lock);
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tc->t_sock = NULL;
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sock->sk->sk_write_space = tc->t_orig_write_space;
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sock->sk->sk_data_ready = tc->t_orig_data_ready;
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sock->sk->sk_state_change = tc->t_orig_state_change;
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sock->sk->sk_user_data = NULL;
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write_unlock_bh(&sock->sk->sk_callback_lock);
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}
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/*
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* rds_tcp_reset_callbacks() switches the to the new sock and
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* returns the existing tc->t_sock.
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*
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* The only functions that set tc->t_sock are rds_tcp_set_callbacks
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* and rds_tcp_reset_callbacks. Send and receive trust that
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* it is set. The absence of RDS_CONN_UP bit protects those paths
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* from being called while it isn't set.
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*/
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void rds_tcp_reset_callbacks(struct socket *sock,
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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 *osock = tc->t_sock;
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if (!osock)
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goto newsock;
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/* Need to resolve a duelling SYN between peers.
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* We have an outstanding SYN to this peer, which may
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* potentially have transitioned to the RDS_CONN_UP state,
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* so we must quiesce any send threads before resetting
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* cp_transport_data. We quiesce these threads by setting
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* cp_state to something other than RDS_CONN_UP, and then
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* waiting for any existing threads in rds_send_xmit to
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* complete release_in_xmit(). (Subsequent threads entering
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* rds_send_xmit() will bail on !rds_conn_up().
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*
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* However an incoming syn-ack at this point would end up
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* marking the conn as RDS_CONN_UP, and would again permit
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* rds_send_xmi() threads through, so ideally we would
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* synchronize on RDS_CONN_UP after lock_sock(), but cannot
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* do that: waiting on !RDS_IN_XMIT after lock_sock() may
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* end up deadlocking with tcp_sendmsg(), and the RDS_IN_XMIT
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* would not get set. As a result, we set c_state to
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* RDS_CONN_RESETTTING, to ensure that rds_tcp_state_change
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* cannot mark rds_conn_path_up() in the window before lock_sock()
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*/
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atomic_set(&cp->cp_state, RDS_CONN_RESETTING);
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wait_event(cp->cp_waitq, !test_bit(RDS_IN_XMIT, &cp->cp_flags));
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lock_sock(osock->sk);
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/* reset receive side state for rds_tcp_data_recv() for osock */
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cancel_delayed_work_sync(&cp->cp_send_w);
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cancel_delayed_work_sync(&cp->cp_recv_w);
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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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rds_tcp_restore_callbacks(osock, tc);
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release_sock(osock->sk);
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sock_release(osock);
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newsock:
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rds_send_path_reset(cp);
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lock_sock(sock->sk);
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rds_tcp_set_callbacks(sock, cp);
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release_sock(sock->sk);
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}
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/* Add tc to rds_tcp_tc_list and set tc->t_sock. See comments
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* above rds_tcp_reset_callbacks for notes about synchronization
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* with data path
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*/
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void rds_tcp_set_callbacks(struct socket *sock, 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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rdsdebug("setting sock %p callbacks to tc %p\n", sock, tc);
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write_lock_bh(&sock->sk->sk_callback_lock);
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/* done under the callback_lock to serialize with write_space */
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spin_lock(&rds_tcp_tc_list_lock);
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list_add_tail(&tc->t_list_item, &rds_tcp_tc_list);
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#if IS_ENABLED(CONFIG_IPV6)
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rds6_tcp_tc_count++;
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#endif
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if (!tc->t_cpath->cp_conn->c_isv6)
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rds_tcp_tc_count++;
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spin_unlock(&rds_tcp_tc_list_lock);
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/* accepted sockets need our listen data ready undone */
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if (sock->sk->sk_data_ready == rds_tcp_listen_data_ready)
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sock->sk->sk_data_ready = sock->sk->sk_user_data;
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tc->t_sock = sock;
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tc->t_cpath = cp;
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tc->t_orig_data_ready = sock->sk->sk_data_ready;
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tc->t_orig_write_space = sock->sk->sk_write_space;
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tc->t_orig_state_change = sock->sk->sk_state_change;
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sock->sk->sk_user_data = cp;
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sock->sk->sk_data_ready = rds_tcp_data_ready;
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sock->sk->sk_write_space = rds_tcp_write_space;
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sock->sk->sk_state_change = rds_tcp_state_change;
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write_unlock_bh(&sock->sk->sk_callback_lock);
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}
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/* Handle RDS_INFO_TCP_SOCKETS socket option. It only returns IPv4
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* connections for backward compatibility.
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*/
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static void rds_tcp_tc_info(struct socket *rds_sock, unsigned int len,
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struct rds_info_iterator *iter,
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struct rds_info_lengths *lens)
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{
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struct rds_info_tcp_socket tsinfo;
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struct rds_tcp_connection *tc;
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unsigned long flags;
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spin_lock_irqsave(&rds_tcp_tc_list_lock, flags);
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if (len / sizeof(tsinfo) < rds_tcp_tc_count)
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goto out;
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list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) {
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struct inet_sock *inet = inet_sk(tc->t_sock->sk);
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if (tc->t_cpath->cp_conn->c_isv6)
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continue;
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tsinfo.local_addr = inet->inet_saddr;
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tsinfo.local_port = inet->inet_sport;
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tsinfo.peer_addr = inet->inet_daddr;
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tsinfo.peer_port = inet->inet_dport;
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tsinfo.hdr_rem = tc->t_tinc_hdr_rem;
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tsinfo.data_rem = tc->t_tinc_data_rem;
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tsinfo.last_sent_nxt = tc->t_last_sent_nxt;
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tsinfo.last_expected_una = tc->t_last_expected_una;
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tsinfo.last_seen_una = tc->t_last_seen_una;
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tsinfo.tos = tc->t_cpath->cp_conn->c_tos;
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rds_info_copy(iter, &tsinfo, sizeof(tsinfo));
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}
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out:
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lens->nr = rds_tcp_tc_count;
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lens->each = sizeof(tsinfo);
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spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags);
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}
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#if IS_ENABLED(CONFIG_IPV6)
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/* Handle RDS6_INFO_TCP_SOCKETS socket option. It returns both IPv4 and
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* IPv6 connections. IPv4 connection address is returned in an IPv4 mapped
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* address.
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*/
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static void rds6_tcp_tc_info(struct socket *sock, unsigned int len,
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struct rds_info_iterator *iter,
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struct rds_info_lengths *lens)
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{
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struct rds6_info_tcp_socket tsinfo6;
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struct rds_tcp_connection *tc;
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unsigned long flags;
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spin_lock_irqsave(&rds_tcp_tc_list_lock, flags);
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if (len / sizeof(tsinfo6) < rds6_tcp_tc_count)
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goto out;
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list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) {
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struct sock *sk = tc->t_sock->sk;
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struct inet_sock *inet = inet_sk(sk);
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tsinfo6.local_addr = sk->sk_v6_rcv_saddr;
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tsinfo6.local_port = inet->inet_sport;
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tsinfo6.peer_addr = sk->sk_v6_daddr;
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tsinfo6.peer_port = inet->inet_dport;
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tsinfo6.hdr_rem = tc->t_tinc_hdr_rem;
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tsinfo6.data_rem = tc->t_tinc_data_rem;
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tsinfo6.last_sent_nxt = tc->t_last_sent_nxt;
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tsinfo6.last_expected_una = tc->t_last_expected_una;
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tsinfo6.last_seen_una = tc->t_last_seen_una;
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rds_info_copy(iter, &tsinfo6, sizeof(tsinfo6));
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}
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out:
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lens->nr = rds6_tcp_tc_count;
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lens->each = sizeof(tsinfo6);
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spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags);
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}
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#endif
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int rds_tcp_laddr_check(struct net *net, const struct in6_addr *addr,
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__u32 scope_id)
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{
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struct net_device *dev = NULL;
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#if IS_ENABLED(CONFIG_IPV6)
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int ret;
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#endif
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if (ipv6_addr_v4mapped(addr)) {
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if (inet_addr_type(net, addr->s6_addr32[3]) == RTN_LOCAL)
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return 0;
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return -EADDRNOTAVAIL;
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}
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/* If the scope_id is specified, check only those addresses
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* hosted on the specified interface.
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*/
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if (scope_id != 0) {
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rcu_read_lock();
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dev = dev_get_by_index_rcu(net, scope_id);
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/* scope_id is not valid... */
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if (!dev) {
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rcu_read_unlock();
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return -EADDRNOTAVAIL;
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}
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rcu_read_unlock();
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}
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#if IS_ENABLED(CONFIG_IPV6)
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ret = ipv6_chk_addr(net, addr, dev, 0);
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if (ret)
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return 0;
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#endif
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return -EADDRNOTAVAIL;
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}
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static void rds_tcp_conn_free(void *arg)
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{
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struct rds_tcp_connection *tc = arg;
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unsigned long flags;
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rdsdebug("freeing tc %p\n", tc);
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spin_lock_irqsave(&rds_tcp_conn_lock, flags);
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if (!tc->t_tcp_node_detached)
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list_del(&tc->t_tcp_node);
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spin_unlock_irqrestore(&rds_tcp_conn_lock, flags);
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kmem_cache_free(rds_tcp_conn_slab, tc);
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}
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static int rds_tcp_conn_alloc(struct rds_connection *conn, gfp_t gfp)
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{
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struct rds_tcp_connection *tc;
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int i, j;
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int ret = 0;
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for (i = 0; i < RDS_MPATH_WORKERS; i++) {
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tc = kmem_cache_alloc(rds_tcp_conn_slab, gfp);
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if (!tc) {
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ret = -ENOMEM;
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goto fail;
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}
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mutex_init(&tc->t_conn_path_lock);
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tc->t_sock = NULL;
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tc->t_tinc = NULL;
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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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conn->c_path[i].cp_transport_data = tc;
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tc->t_cpath = &conn->c_path[i];
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tc->t_tcp_node_detached = true;
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rdsdebug("rds_conn_path [%d] tc %p\n", i,
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conn->c_path[i].cp_transport_data);
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}
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spin_lock_irq(&rds_tcp_conn_lock);
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for (i = 0; i < RDS_MPATH_WORKERS; i++) {
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tc = conn->c_path[i].cp_transport_data;
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tc->t_tcp_node_detached = false;
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list_add_tail(&tc->t_tcp_node, &rds_tcp_conn_list);
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}
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spin_unlock_irq(&rds_tcp_conn_lock);
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fail:
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if (ret) {
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for (j = 0; j < i; j++)
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rds_tcp_conn_free(conn->c_path[j].cp_transport_data);
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}
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return ret;
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}
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static bool list_has_conn(struct list_head *list, struct rds_connection *conn)
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{
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struct rds_tcp_connection *tc, *_tc;
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list_for_each_entry_safe(tc, _tc, list, t_tcp_node) {
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if (tc->t_cpath->cp_conn == conn)
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return true;
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}
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return false;
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}
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static void rds_tcp_set_unloading(void)
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{
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atomic_set(&rds_tcp_unloading, 1);
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}
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static bool rds_tcp_is_unloading(struct rds_connection *conn)
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{
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return atomic_read(&rds_tcp_unloading) != 0;
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}
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static void rds_tcp_destroy_conns(void)
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{
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struct rds_tcp_connection *tc, *_tc;
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LIST_HEAD(tmp_list);
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/* avoid calling conn_destroy with irqs off */
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spin_lock_irq(&rds_tcp_conn_lock);
|
|
list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) {
|
|
if (!list_has_conn(&tmp_list, tc->t_cpath->cp_conn))
|
|
list_move_tail(&tc->t_tcp_node, &tmp_list);
|
|
}
|
|
spin_unlock_irq(&rds_tcp_conn_lock);
|
|
|
|
list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node)
|
|
rds_conn_destroy(tc->t_cpath->cp_conn);
|
|
}
|
|
|
|
static void rds_tcp_exit(void);
|
|
|
|
static u8 rds_tcp_get_tos_map(u8 tos)
|
|
{
|
|
/* all user tos mapped to default 0 for TCP transport */
|
|
return 0;
|
|
}
|
|
|
|
struct rds_transport rds_tcp_transport = {
|
|
.laddr_check = rds_tcp_laddr_check,
|
|
.xmit_path_prepare = rds_tcp_xmit_path_prepare,
|
|
.xmit_path_complete = rds_tcp_xmit_path_complete,
|
|
.xmit = rds_tcp_xmit,
|
|
.recv_path = rds_tcp_recv_path,
|
|
.conn_alloc = rds_tcp_conn_alloc,
|
|
.conn_free = rds_tcp_conn_free,
|
|
.conn_path_connect = rds_tcp_conn_path_connect,
|
|
.conn_path_shutdown = rds_tcp_conn_path_shutdown,
|
|
.inc_copy_to_user = rds_tcp_inc_copy_to_user,
|
|
.inc_free = rds_tcp_inc_free,
|
|
.stats_info_copy = rds_tcp_stats_info_copy,
|
|
.exit = rds_tcp_exit,
|
|
.get_tos_map = rds_tcp_get_tos_map,
|
|
.t_owner = THIS_MODULE,
|
|
.t_name = "tcp",
|
|
.t_type = RDS_TRANS_TCP,
|
|
.t_prefer_loopback = 1,
|
|
.t_mp_capable = 1,
|
|
.t_unloading = rds_tcp_is_unloading,
|
|
};
|
|
|
|
static unsigned int rds_tcp_netid;
|
|
|
|
/* per-network namespace private data for this module */
|
|
struct rds_tcp_net {
|
|
struct socket *rds_tcp_listen_sock;
|
|
struct work_struct rds_tcp_accept_w;
|
|
struct ctl_table_header *rds_tcp_sysctl;
|
|
struct ctl_table *ctl_table;
|
|
int sndbuf_size;
|
|
int rcvbuf_size;
|
|
};
|
|
|
|
/* All module specific customizations to the RDS-TCP socket should be done in
|
|
* rds_tcp_tune() and applied after socket creation.
|
|
*/
|
|
bool rds_tcp_tune(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct net *net = sock_net(sk);
|
|
struct rds_tcp_net *rtn;
|
|
|
|
tcp_sock_set_nodelay(sock->sk);
|
|
lock_sock(sk);
|
|
/* TCP timer functions might access net namespace even after
|
|
* a process which created this net namespace terminated.
|
|
*/
|
|
if (!sk->sk_net_refcnt) {
|
|
if (!maybe_get_net(net)) {
|
|
release_sock(sk);
|
|
return false;
|
|
}
|
|
sk->sk_net_refcnt = 1;
|
|
netns_tracker_alloc(net, &sk->ns_tracker, GFP_KERNEL);
|
|
sock_inuse_add(net, 1);
|
|
}
|
|
rtn = net_generic(net, rds_tcp_netid);
|
|
if (rtn->sndbuf_size > 0) {
|
|
sk->sk_sndbuf = rtn->sndbuf_size;
|
|
sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
|
|
}
|
|
if (rtn->rcvbuf_size > 0) {
|
|
sk->sk_rcvbuf = rtn->rcvbuf_size;
|
|
sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
|
|
}
|
|
release_sock(sk);
|
|
return true;
|
|
}
|
|
|
|
static void rds_tcp_accept_worker(struct work_struct *work)
|
|
{
|
|
struct rds_tcp_net *rtn = container_of(work,
|
|
struct rds_tcp_net,
|
|
rds_tcp_accept_w);
|
|
|
|
while (rds_tcp_accept_one(rtn->rds_tcp_listen_sock) == 0)
|
|
cond_resched();
|
|
}
|
|
|
|
void rds_tcp_accept_work(struct sock *sk)
|
|
{
|
|
struct net *net = sock_net(sk);
|
|
struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid);
|
|
|
|
queue_work(rds_wq, &rtn->rds_tcp_accept_w);
|
|
}
|
|
|
|
static __net_init int rds_tcp_init_net(struct net *net)
|
|
{
|
|
struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid);
|
|
struct ctl_table *tbl;
|
|
int err = 0;
|
|
|
|
memset(rtn, 0, sizeof(*rtn));
|
|
|
|
/* {snd, rcv}buf_size default to 0, which implies we let the
|
|
* stack pick the value, and permit auto-tuning of buffer size.
|
|
*/
|
|
if (net == &init_net) {
|
|
tbl = rds_tcp_sysctl_table;
|
|
} else {
|
|
tbl = kmemdup(rds_tcp_sysctl_table,
|
|
sizeof(rds_tcp_sysctl_table), GFP_KERNEL);
|
|
if (!tbl) {
|
|
pr_warn("could not set allocate sysctl table\n");
|
|
return -ENOMEM;
|
|
}
|
|
rtn->ctl_table = tbl;
|
|
}
|
|
tbl[RDS_TCP_SNDBUF].data = &rtn->sndbuf_size;
|
|
tbl[RDS_TCP_RCVBUF].data = &rtn->rcvbuf_size;
|
|
rtn->rds_tcp_sysctl = register_net_sysctl(net, "net/rds/tcp", tbl);
|
|
if (!rtn->rds_tcp_sysctl) {
|
|
pr_warn("could not register sysctl\n");
|
|
err = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net, true);
|
|
#else
|
|
rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net, false);
|
|
#endif
|
|
if (!rtn->rds_tcp_listen_sock) {
|
|
pr_warn("could not set up IPv6 listen sock\n");
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
/* Try IPv4 as some systems disable IPv6 */
|
|
rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net, false);
|
|
if (!rtn->rds_tcp_listen_sock) {
|
|
#endif
|
|
unregister_net_sysctl_table(rtn->rds_tcp_sysctl);
|
|
rtn->rds_tcp_sysctl = NULL;
|
|
err = -EAFNOSUPPORT;
|
|
goto fail;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
}
|
|
#endif
|
|
}
|
|
INIT_WORK(&rtn->rds_tcp_accept_w, rds_tcp_accept_worker);
|
|
return 0;
|
|
|
|
fail:
|
|
if (net != &init_net)
|
|
kfree(tbl);
|
|
return err;
|
|
}
|
|
|
|
static void rds_tcp_kill_sock(struct net *net)
|
|
{
|
|
struct rds_tcp_connection *tc, *_tc;
|
|
LIST_HEAD(tmp_list);
|
|
struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid);
|
|
struct socket *lsock = rtn->rds_tcp_listen_sock;
|
|
|
|
rtn->rds_tcp_listen_sock = NULL;
|
|
rds_tcp_listen_stop(lsock, &rtn->rds_tcp_accept_w);
|
|
spin_lock_irq(&rds_tcp_conn_lock);
|
|
list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) {
|
|
struct net *c_net = read_pnet(&tc->t_cpath->cp_conn->c_net);
|
|
|
|
if (net != c_net)
|
|
continue;
|
|
if (!list_has_conn(&tmp_list, tc->t_cpath->cp_conn)) {
|
|
list_move_tail(&tc->t_tcp_node, &tmp_list);
|
|
} else {
|
|
list_del(&tc->t_tcp_node);
|
|
tc->t_tcp_node_detached = true;
|
|
}
|
|
}
|
|
spin_unlock_irq(&rds_tcp_conn_lock);
|
|
list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node)
|
|
rds_conn_destroy(tc->t_cpath->cp_conn);
|
|
}
|
|
|
|
static void __net_exit rds_tcp_exit_net(struct net *net)
|
|
{
|
|
struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid);
|
|
|
|
rds_tcp_kill_sock(net);
|
|
|
|
if (rtn->rds_tcp_sysctl)
|
|
unregister_net_sysctl_table(rtn->rds_tcp_sysctl);
|
|
|
|
if (net != &init_net)
|
|
kfree(rtn->ctl_table);
|
|
}
|
|
|
|
static struct pernet_operations rds_tcp_net_ops = {
|
|
.init = rds_tcp_init_net,
|
|
.exit = rds_tcp_exit_net,
|
|
.id = &rds_tcp_netid,
|
|
.size = sizeof(struct rds_tcp_net),
|
|
};
|
|
|
|
void *rds_tcp_listen_sock_def_readable(struct net *net)
|
|
{
|
|
struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid);
|
|
struct socket *lsock = rtn->rds_tcp_listen_sock;
|
|
|
|
if (!lsock)
|
|
return NULL;
|
|
|
|
return lsock->sk->sk_user_data;
|
|
}
|
|
|
|
/* when sysctl is used to modify some kernel socket parameters,this
|
|
* function resets the RDS connections in that netns so that we can
|
|
* restart with new parameters. The assumption is that such reset
|
|
* events are few and far-between.
|
|
*/
|
|
static void rds_tcp_sysctl_reset(struct net *net)
|
|
{
|
|
struct rds_tcp_connection *tc, *_tc;
|
|
|
|
spin_lock_irq(&rds_tcp_conn_lock);
|
|
list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) {
|
|
struct net *c_net = read_pnet(&tc->t_cpath->cp_conn->c_net);
|
|
|
|
if (net != c_net || !tc->t_sock)
|
|
continue;
|
|
|
|
/* reconnect with new parameters */
|
|
rds_conn_path_drop(tc->t_cpath, false);
|
|
}
|
|
spin_unlock_irq(&rds_tcp_conn_lock);
|
|
}
|
|
|
|
static int rds_tcp_skbuf_handler(struct ctl_table *ctl, int write,
|
|
void *buffer, size_t *lenp, loff_t *fpos)
|
|
{
|
|
struct net *net = current->nsproxy->net_ns;
|
|
int err;
|
|
|
|
err = proc_dointvec_minmax(ctl, write, buffer, lenp, fpos);
|
|
if (err < 0) {
|
|
pr_warn("Invalid input. Must be >= %d\n",
|
|
*(int *)(ctl->extra1));
|
|
return err;
|
|
}
|
|
if (write)
|
|
rds_tcp_sysctl_reset(net);
|
|
return 0;
|
|
}
|
|
|
|
static void rds_tcp_exit(void)
|
|
{
|
|
rds_tcp_set_unloading();
|
|
synchronize_rcu();
|
|
rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
rds_info_deregister_func(RDS6_INFO_TCP_SOCKETS, rds6_tcp_tc_info);
|
|
#endif
|
|
unregister_pernet_device(&rds_tcp_net_ops);
|
|
rds_tcp_destroy_conns();
|
|
rds_trans_unregister(&rds_tcp_transport);
|
|
rds_tcp_recv_exit();
|
|
kmem_cache_destroy(rds_tcp_conn_slab);
|
|
}
|
|
module_exit(rds_tcp_exit);
|
|
|
|
static int rds_tcp_init(void)
|
|
{
|
|
int ret;
|
|
|
|
rds_tcp_conn_slab = kmem_cache_create("rds_tcp_connection",
|
|
sizeof(struct rds_tcp_connection),
|
|
0, 0, NULL);
|
|
if (!rds_tcp_conn_slab) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ret = rds_tcp_recv_init();
|
|
if (ret)
|
|
goto out_slab;
|
|
|
|
ret = register_pernet_device(&rds_tcp_net_ops);
|
|
if (ret)
|
|
goto out_recv;
|
|
|
|
rds_trans_register(&rds_tcp_transport);
|
|
|
|
rds_info_register_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
rds_info_register_func(RDS6_INFO_TCP_SOCKETS, rds6_tcp_tc_info);
|
|
#endif
|
|
|
|
goto out;
|
|
out_recv:
|
|
rds_tcp_recv_exit();
|
|
out_slab:
|
|
kmem_cache_destroy(rds_tcp_conn_slab);
|
|
out:
|
|
return ret;
|
|
}
|
|
module_init(rds_tcp_init);
|
|
|
|
MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
|
|
MODULE_DESCRIPTION("RDS: TCP transport");
|
|
MODULE_LICENSE("Dual BSD/GPL");
|