![Sowmini Varadhan](/assets/img/avatar_default.png)
An rds_connection can get added during netns deletion between lines 528
and 529 of
506 static void rds_tcp_kill_sock(struct net *net)
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/* code to pull out all the rds_connections that should be destroyed */
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528 spin_unlock_irq(&rds_tcp_conn_lock);
529 list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node)
530 rds_conn_destroy(tc->t_cpath->cp_conn);
Such an rds_connection would miss out the rds_conn_destroy()
loop (that cancels all pending work) and (if it was scheduled
after netns deletion) could trigger the use-after-free.
A similar race-window exists for the module unload path
in rds_tcp_exit -> rds_tcp_destroy_conns
Concurrency with netns deletion (rds_tcp_kill_sock()) must be handled
by checking check_net() before enqueuing new work or adding new
connections.
Concurrency with module-unload is handled by maintaining a module
specific flag that is set at the start of the module exit function,
and must be checked before enqueuing new work or adding new connections.
This commit refactors existing RDS_DESTROY_PENDING checks added by
commit 3db6e0d172
("rds: use RCU to synchronize work-enqueue with
connection teardown") and consolidates all the concurrency checks
listed above into the function rds_destroy_pending().
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
686 lines
19 KiB
C
686 lines
19 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/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 "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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static unsigned int rds_tcp_tc_count;
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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 __user *buffer, size_t *lenp,
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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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/* doing it this way avoids calling tcp_sk() */
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void rds_tcp_nonagle(struct socket *sock)
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{
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int val = 1;
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kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (void *)&val,
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sizeof(val));
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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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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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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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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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struct sockaddr_in sin;
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int sinlen;
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struct socket *sock;
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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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sock = tc->t_sock;
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if (sock) {
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sock->ops->getname(sock, (struct sockaddr *)&sin,
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&sinlen, 0);
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tsinfo.local_addr = sin.sin_addr.s_addr;
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tsinfo.local_port = sin.sin_port;
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sock->ops->getname(sock, (struct sockaddr *)&sin,
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&sinlen, 1);
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tsinfo.peer_addr = sin.sin_addr.s_addr;
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tsinfo.peer_port = sin.sin_port;
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}
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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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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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static int rds_tcp_laddr_check(struct net *net, __be32 addr)
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{
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if (inet_addr_type(net, addr) == RTN_LOCAL)
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return 0;
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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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rdsdebug("freeing tc %p\n", tc);
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spin_lock_bh(&rds_tcp_conn_lock);
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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_bh(&rds_tcp_conn_lock);
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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_bh(&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_bh(&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);
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list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) {
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if (!list_has_conn(&tmp_list, tc->t_cpath->cp_conn))
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list_move_tail(&tc->t_tcp_node, &tmp_list);
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}
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spin_unlock_irq(&rds_tcp_conn_lock);
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list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node)
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rds_conn_destroy(tc->t_cpath->cp_conn);
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}
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static void rds_tcp_exit(void);
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struct rds_transport rds_tcp_transport = {
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.laddr_check = rds_tcp_laddr_check,
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.xmit_path_prepare = rds_tcp_xmit_path_prepare,
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.xmit_path_complete = rds_tcp_xmit_path_complete,
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.xmit = rds_tcp_xmit,
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.recv_path = rds_tcp_recv_path,
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.conn_alloc = rds_tcp_conn_alloc,
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.conn_free = rds_tcp_conn_free,
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.conn_path_connect = rds_tcp_conn_path_connect,
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.conn_path_shutdown = rds_tcp_conn_path_shutdown,
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.inc_copy_to_user = rds_tcp_inc_copy_to_user,
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.inc_free = rds_tcp_inc_free,
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.stats_info_copy = rds_tcp_stats_info_copy,
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.exit = rds_tcp_exit,
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.t_owner = THIS_MODULE,
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.t_name = "tcp",
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.t_type = RDS_TRANS_TCP,
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.t_prefer_loopback = 1,
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.t_mp_capable = 1,
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.t_unloading = rds_tcp_is_unloading,
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};
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static unsigned int rds_tcp_netid;
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/* per-network namespace private data for this module */
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struct rds_tcp_net {
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struct socket *rds_tcp_listen_sock;
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struct work_struct rds_tcp_accept_w;
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struct ctl_table_header *rds_tcp_sysctl;
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struct ctl_table *ctl_table;
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int sndbuf_size;
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int rcvbuf_size;
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};
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/* All module specific customizations to the RDS-TCP socket should be done in
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* rds_tcp_tune() and applied after socket creation.
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*/
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void rds_tcp_tune(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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struct net *net = sock_net(sk);
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struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid);
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rds_tcp_nonagle(sock);
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lock_sock(sk);
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if (rtn->sndbuf_size > 0) {
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sk->sk_sndbuf = rtn->sndbuf_size;
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sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
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}
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if (rtn->rcvbuf_size > 0) {
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sk->sk_sndbuf = rtn->rcvbuf_size;
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sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
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}
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release_sock(sk);
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}
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static void rds_tcp_accept_worker(struct work_struct *work)
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{
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struct rds_tcp_net *rtn = container_of(work,
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struct rds_tcp_net,
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rds_tcp_accept_w);
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|
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 syctl 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;
|
|
}
|
|
rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net);
|
|
if (!rtn->rds_tcp_listen_sock) {
|
|
pr_warn("could not set up listen sock\n");
|
|
unregister_net_sysctl_table(rtn->rds_tcp_sysctl);
|
|
rtn->rds_tcp_sysctl = NULL;
|
|
err = -EAFNOSUPPORT;
|
|
goto fail;
|
|
}
|
|
INIT_WORK(&rtn->rds_tcp_accept_w, rds_tcp_accept_worker);
|
|
return 0;
|
|
|
|
fail:
|
|
if (net != &init_net)
|
|
kfree(tbl);
|
|
return err;
|
|
}
|
|
|
|
static void __net_exit rds_tcp_exit_net(struct net *net)
|
|
{
|
|
struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid);
|
|
|
|
if (rtn->rds_tcp_sysctl)
|
|
unregister_net_sysctl_table(rtn->rds_tcp_sysctl);
|
|
|
|
if (net != &init_net && rtn->ctl_table)
|
|
kfree(rtn->ctl_table);
|
|
|
|
/* If rds_tcp_exit_net() is called as a result of netns deletion,
|
|
* the rds_tcp_kill_sock() device notifier would already have cleaned
|
|
* up the listen socket, thus there is no work to do in this function.
|
|
*
|
|
* If rds_tcp_exit_net() is called as a result of module unload,
|
|
* i.e., due to rds_tcp_exit() -> unregister_pernet_subsys(), then
|
|
* we do need to clean up the listen socket here.
|
|
*/
|
|
if (rtn->rds_tcp_listen_sock) {
|
|
struct socket *lsock = rtn->rds_tcp_listen_sock;
|
|
|
|
rtn->rds_tcp_listen_sock = NULL;
|
|
rds_tcp_listen_stop(lsock, &rtn->rds_tcp_accept_w);
|
|
}
|
|
}
|
|
|
|
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),
|
|
};
|
|
|
|
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_bh(&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;
|
|
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_bh(&rds_tcp_conn_lock);
|
|
list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node)
|
|
rds_conn_destroy(tc->t_cpath->cp_conn);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static int rds_tcp_dev_event(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
|
|
/* rds-tcp registers as a pernet subys, so the ->exit will only
|
|
* get invoked after network acitivity has quiesced. We need to
|
|
* clean up all sockets to quiesce network activity, and use
|
|
* the unregistration of the per-net loopback device as a trigger
|
|
* to start that cleanup.
|
|
*/
|
|
if (event == NETDEV_UNREGISTER_FINAL &&
|
|
dev->ifindex == LOOPBACK_IFINDEX)
|
|
rds_tcp_kill_sock(dev_net(dev));
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block rds_tcp_dev_notifier = {
|
|
.notifier_call = rds_tcp_dev_event,
|
|
.priority = -10, /* must be called after other network notifiers */
|
|
};
|
|
|
|
/* 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_bh(&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_bh(&rds_tcp_conn_lock);
|
|
}
|
|
|
|
static int rds_tcp_skbuf_handler(struct ctl_table *ctl, int write,
|
|
void __user *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);
|
|
unregister_pernet_subsys(&rds_tcp_net_ops);
|
|
if (unregister_netdevice_notifier(&rds_tcp_dev_notifier))
|
|
pr_warn("could not unregister rds_tcp_dev_notifier\n");
|
|
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_subsys(&rds_tcp_net_ops);
|
|
if (ret)
|
|
goto out_recv;
|
|
|
|
ret = register_netdevice_notifier(&rds_tcp_dev_notifier);
|
|
if (ret) {
|
|
pr_warn("could not register rds_tcp_dev_notifier\n");
|
|
goto out_pernet;
|
|
}
|
|
|
|
rds_trans_register(&rds_tcp_transport);
|
|
|
|
rds_info_register_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
|
|
|
|
goto out;
|
|
|
|
out_pernet:
|
|
unregister_pernet_subsys(&rds_tcp_net_ops);
|
|
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");
|
|
|