/*
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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/gfp.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_keepalive(struct socket *sock)
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{
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/* values below based on xs_udp_default_timeout */
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int keepidle = 5; /* send a probe 'keepidle' secs after last data */
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int keepcnt = 5; /* number of unack'ed probes before declaring dead */
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sock_set_keepalive(sock->sk);
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tcp_sock_set_keepcnt(sock->sk, keepcnt);
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tcp_sock_set_keepidle(sock->sk, keepidle);
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/* KEEPINTVL is the interval between successive probes. We follow
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* the model in xs_tcp_finish_connecting() and re-use keepidle.
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*/
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tcp_sock_set_keepintvl(sock->sk, keepidle);
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}
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/* rds_tcp_accept_one_path(): if accepting on cp_index > 0, make sure the
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* client's ipaddr < server's ipaddr. Otherwise, close the accepted
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* socket and force a reconneect from smaller -> larger ip addr. The reason
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* we special case cp_index 0 is to allow the rds probe ping itself to itself
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* get through efficiently.
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* Since reconnects are only initiated from the node with the numerically
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* smaller ip address, we recycle conns in RDS_CONN_ERROR on the passive side
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* by moving them to CONNECTING in this function.
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*/
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static
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struct rds_tcp_connection *rds_tcp_accept_one_path(struct rds_connection *conn)
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{
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int i;
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int npaths = max_t(int, 1, conn->c_npaths);
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/* for mprds, all paths MUST be initiated by the peer
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* with the smaller address.
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*/
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if (rds_addr_cmp(&conn->c_faddr, &conn->c_laddr) >= 0) {
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/* Make sure we initiate at least one path if this
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* has not already been done; rds_start_mprds() will
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* take care of additional paths, if necessary.
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*/
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if (npaths == 1)
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rds_conn_path_connect_if_down(&conn->c_path[0]);
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return NULL;
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}
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for (i = 0; i < npaths; i++) {
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struct rds_conn_path *cp = &conn->c_path[i];
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if (rds_conn_path_transition(cp, RDS_CONN_DOWN,
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RDS_CONN_CONNECTING) ||
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rds_conn_path_transition(cp, RDS_CONN_ERROR,
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RDS_CONN_CONNECTING)) {
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return cp->cp_transport_data;
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}
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}
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return NULL;
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}
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int rds_tcp_accept_one(struct socket *sock)
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{
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struct socket *new_sock = NULL;
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struct rds_connection *conn;
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int ret;
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struct inet_sock *inet;
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struct rds_tcp_connection *rs_tcp = NULL;
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int conn_state;
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struct rds_conn_path *cp;
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struct in6_addr *my_addr, *peer_addr;
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#if !IS_ENABLED(CONFIG_IPV6)
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struct in6_addr saddr, daddr;
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#endif
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int dev_if = 0;
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if (!sock) /* module unload or netns delete in progress */
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return -ENETUNREACH;
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ret = sock_create_lite(sock->sk->sk_family,
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sock->sk->sk_type, sock->sk->sk_protocol,
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&new_sock);
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if (ret)
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goto out;
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ret = sock->ops->accept(sock, new_sock, O_NONBLOCK, true);
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if (ret < 0)
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goto out;
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/* sock_create_lite() does not get a hold on the owner module so we
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* need to do it here. Note that sock_release() uses sock->ops to
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* determine if it needs to decrement the reference count. So set
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* sock->ops after calling accept() in case that fails. And there's
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* no need to do try_module_get() as the listener should have a hold
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* already.
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*/
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new_sock->ops = sock->ops;
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__module_get(new_sock->ops->owner);
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rds_tcp_keepalive(new_sock);
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rds_tcp_tune(new_sock);
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inet = inet_sk(new_sock->sk);
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#if IS_ENABLED(CONFIG_IPV6)
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my_addr = &new_sock->sk->sk_v6_rcv_saddr;
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peer_addr = &new_sock->sk->sk_v6_daddr;
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#else
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ipv6_addr_set_v4mapped(inet->inet_saddr, &saddr);
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ipv6_addr_set_v4mapped(inet->inet_daddr, &daddr);
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my_addr = &saddr;
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peer_addr = &daddr;
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#endif
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rdsdebug("accepted family %d tcp %pI6c:%u -> %pI6c:%u\n",
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sock->sk->sk_family,
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my_addr, ntohs(inet->inet_sport),
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peer_addr, ntohs(inet->inet_dport));
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#if IS_ENABLED(CONFIG_IPV6)
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/* sk_bound_dev_if is not set if the peer address is not link local
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* address. In this case, it happens that mcast_oif is set. So
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* just use it.
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*/
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if ((ipv6_addr_type(my_addr) & IPV6_ADDR_LINKLOCAL) &&
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!(ipv6_addr_type(peer_addr) & IPV6_ADDR_LINKLOCAL)) {
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struct ipv6_pinfo *inet6;
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inet6 = inet6_sk(new_sock->sk);
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dev_if = inet6->mcast_oif;
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} else {
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dev_if = new_sock->sk->sk_bound_dev_if;
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}
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#endif
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if (!rds_tcp_laddr_check(sock_net(sock->sk), peer_addr, dev_if)) {
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/* local address connection is only allowed via loopback */
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ret = -EOPNOTSUPP;
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goto out;
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}
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conn = rds_conn_create(sock_net(sock->sk),
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my_addr, peer_addr,
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&rds_tcp_transport, 0, GFP_KERNEL, dev_if);
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if (IS_ERR(conn)) {
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ret = PTR_ERR(conn);
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goto out;
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}
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/* An incoming SYN request came in, and TCP just accepted it.
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*
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* If the client reboots, this conn will need to be cleaned up.
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* rds_tcp_state_change() will do that cleanup
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*/
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rs_tcp = rds_tcp_accept_one_path(conn);
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if (!rs_tcp)
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goto rst_nsk;
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mutex_lock(&rs_tcp->t_conn_path_lock);
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cp = rs_tcp->t_cpath;
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conn_state = rds_conn_path_state(cp);
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WARN_ON(conn_state == RDS_CONN_UP);
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if (conn_state != RDS_CONN_CONNECTING && conn_state != RDS_CONN_ERROR)
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goto rst_nsk;
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if (rs_tcp->t_sock) {
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/* Duelling SYN has been handled in rds_tcp_accept_one() */
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rds_tcp_reset_callbacks(new_sock, cp);
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/* rds_connect_path_complete() marks RDS_CONN_UP */
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rds_connect_path_complete(cp, RDS_CONN_RESETTING);
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} else {
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rds_tcp_set_callbacks(new_sock, cp);
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rds_connect_path_complete(cp, RDS_CONN_CONNECTING);
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}
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new_sock = NULL;
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ret = 0;
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if (conn->c_npaths == 0)
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rds_send_ping(cp->cp_conn, cp->cp_index);
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goto out;
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rst_nsk:
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/* reset the newly returned accept sock and bail.
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* It is safe to set linger on new_sock because the RDS connection
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* has not been brought up on new_sock, so no RDS-level data could
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* be pending on it. By setting linger, we achieve the side-effect
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* of avoiding TIME_WAIT state on new_sock.
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*/
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sock_no_linger(new_sock->sk);
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kernel_sock_shutdown(new_sock, SHUT_RDWR);
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ret = 0;
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out:
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if (rs_tcp)
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mutex_unlock(&rs_tcp->t_conn_path_lock);
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if (new_sock)
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sock_release(new_sock);
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return ret;
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}
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void rds_tcp_listen_data_ready(struct sock *sk)
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{
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void (*ready)(struct sock *sk);
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rdsdebug("listen data ready sk %p\n", sk);
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read_lock_bh(&sk->sk_callback_lock);
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ready = sk->sk_user_data;
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if (!ready) { /* check for teardown race */
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ready = sk->sk_data_ready;
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goto out;
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}
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/*
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* ->sk_data_ready is also called for a newly established child socket
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* before it has been accepted and the accepter has set up their
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* data_ready.. we only want to queue listen work for our listening
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* socket
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*
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* (*ready)() may be null if we are racing with netns delete, and
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* the listen socket is being torn down.
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*/
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if (sk->sk_state == TCP_LISTEN)
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rds_tcp_accept_work(sk);
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else
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ready = rds_tcp_listen_sock_def_readable(sock_net(sk));
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out:
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read_unlock_bh(&sk->sk_callback_lock);
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if (ready)
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ready(sk);
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}
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struct socket *rds_tcp_listen_init(struct net *net, bool isv6)
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{
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struct socket *sock = NULL;
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struct sockaddr_storage ss;
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struct sockaddr_in6 *sin6;
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struct sockaddr_in *sin;
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int addr_len;
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int ret;
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ret = sock_create_kern(net, isv6 ? PF_INET6 : PF_INET, SOCK_STREAM,
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IPPROTO_TCP, &sock);
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if (ret < 0) {
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rdsdebug("could not create %s listener socket: %d\n",
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isv6 ? "IPv6" : "IPv4", ret);
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goto out;
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}
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sock->sk->sk_reuse = SK_CAN_REUSE;
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tcp_sock_set_nodelay(sock->sk);
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write_lock_bh(&sock->sk->sk_callback_lock);
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sock->sk->sk_user_data = sock->sk->sk_data_ready;
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sock->sk->sk_data_ready = rds_tcp_listen_data_ready;
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write_unlock_bh(&sock->sk->sk_callback_lock);
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if (isv6) {
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sin6 = (struct sockaddr_in6 *)&ss;
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sin6->sin6_family = PF_INET6;
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sin6->sin6_addr = in6addr_any;
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sin6->sin6_port = (__force u16)htons(RDS_TCP_PORT);
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sin6->sin6_scope_id = 0;
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sin6->sin6_flowinfo = 0;
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addr_len = sizeof(*sin6);
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} else {
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sin = (struct sockaddr_in *)&ss;
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sin->sin_family = PF_INET;
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sin->sin_addr.s_addr = INADDR_ANY;
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sin->sin_port = (__force u16)htons(RDS_TCP_PORT);
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addr_len = sizeof(*sin);
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}
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ret = sock->ops->bind(sock, (struct sockaddr *)&ss, addr_len);
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if (ret < 0) {
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rdsdebug("could not bind %s listener socket: %d\n",
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isv6 ? "IPv6" : "IPv4", ret);
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goto out;
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}
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ret = sock->ops->listen(sock, 64);
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if (ret < 0)
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goto out;
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return sock;
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out:
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if (sock)
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sock_release(sock);
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return NULL;
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}
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void rds_tcp_listen_stop(struct socket *sock, struct work_struct *acceptor)
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{
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struct sock *sk;
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if (!sock)
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return;
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sk = sock->sk;
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/* serialize with and prevent further callbacks */
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lock_sock(sk);
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write_lock_bh(&sk->sk_callback_lock);
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if (sk->sk_user_data) {
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sk->sk_data_ready = sk->sk_user_data;
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sk->sk_user_data = NULL;
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}
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write_unlock_bh(&sk->sk_callback_lock);
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release_sock(sk);
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/* wait for accepts to stop and close the socket */
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flush_workqueue(rds_wq);
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flush_work(acceptor);
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sock_release(sock);
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}
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