mirror of https://gitee.com/openkylin/linux.git
3375 lines
86 KiB
C
3375 lines
86 KiB
C
/*
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* net/tipc/socket.c: TIPC socket API
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*
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* Copyright (c) 2001-2007, 2012-2017, Ericsson AB
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* Copyright (c) 2004-2008, 2010-2013, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/rhashtable.h>
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#include <linux/sched/signal.h>
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#include "core.h"
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#include "name_table.h"
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#include "node.h"
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#include "link.h"
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#include "name_distr.h"
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#include "socket.h"
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#include "bcast.h"
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#include "netlink.h"
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#include "group.h"
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#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
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#define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */
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#define TIPC_FWD_MSG 1
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#define TIPC_MAX_PORT 0xffffffff
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#define TIPC_MIN_PORT 1
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#define TIPC_ACK_RATE 4 /* ACK at 1/4 of of rcv window size */
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enum {
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TIPC_LISTEN = TCP_LISTEN,
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TIPC_ESTABLISHED = TCP_ESTABLISHED,
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TIPC_OPEN = TCP_CLOSE,
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TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
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TIPC_CONNECTING = TCP_SYN_SENT,
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};
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struct sockaddr_pair {
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struct sockaddr_tipc sock;
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struct sockaddr_tipc member;
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};
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/**
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* struct tipc_sock - TIPC socket structure
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* @sk: socket - interacts with 'port' and with user via the socket API
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* @conn_type: TIPC type used when connection was established
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* @conn_instance: TIPC instance used when connection was established
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* @published: non-zero if port has one or more associated names
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* @max_pkt: maximum packet size "hint" used when building messages sent by port
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* @portid: unique port identity in TIPC socket hash table
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* @phdr: preformatted message header used when sending messages
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* #cong_links: list of congested links
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* @publications: list of publications for port
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* @blocking_link: address of the congested link we are currently sleeping on
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* @pub_count: total # of publications port has made during its lifetime
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* @probing_state:
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* @conn_timeout: the time we can wait for an unresponded setup request
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* @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
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* @cong_link_cnt: number of congested links
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* @snt_unacked: # messages sent by socket, and not yet acked by peer
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* @rcv_unacked: # messages read by user, but not yet acked back to peer
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* @peer: 'connected' peer for dgram/rdm
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* @node: hash table node
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* @mc_method: cookie for use between socket and broadcast layer
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* @rcu: rcu struct for tipc_sock
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*/
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struct tipc_sock {
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struct sock sk;
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u32 conn_type;
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u32 conn_instance;
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int published;
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u32 max_pkt;
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u32 portid;
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struct tipc_msg phdr;
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struct list_head cong_links;
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struct list_head publications;
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u32 pub_count;
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uint conn_timeout;
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atomic_t dupl_rcvcnt;
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bool probe_unacked;
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u16 cong_link_cnt;
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u16 snt_unacked;
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u16 snd_win;
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u16 peer_caps;
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u16 rcv_unacked;
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u16 rcv_win;
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struct sockaddr_tipc peer;
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struct rhash_head node;
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struct tipc_mc_method mc_method;
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struct rcu_head rcu;
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struct tipc_group *group;
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bool group_is_open;
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};
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static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
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static void tipc_data_ready(struct sock *sk);
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static void tipc_write_space(struct sock *sk);
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static void tipc_sock_destruct(struct sock *sk);
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static int tipc_release(struct socket *sock);
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static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
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bool kern);
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static void tipc_sk_timeout(struct timer_list *t);
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static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
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struct tipc_name_seq const *seq);
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static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
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struct tipc_name_seq const *seq);
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static int tipc_sk_leave(struct tipc_sock *tsk);
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static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
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static int tipc_sk_insert(struct tipc_sock *tsk);
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static void tipc_sk_remove(struct tipc_sock *tsk);
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static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
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static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
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static const struct proto_ops packet_ops;
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static const struct proto_ops stream_ops;
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static const struct proto_ops msg_ops;
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static struct proto tipc_proto;
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static const struct rhashtable_params tsk_rht_params;
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static u32 tsk_own_node(struct tipc_sock *tsk)
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{
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return msg_prevnode(&tsk->phdr);
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}
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static u32 tsk_peer_node(struct tipc_sock *tsk)
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{
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return msg_destnode(&tsk->phdr);
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}
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static u32 tsk_peer_port(struct tipc_sock *tsk)
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{
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return msg_destport(&tsk->phdr);
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}
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static bool tsk_unreliable(struct tipc_sock *tsk)
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{
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return msg_src_droppable(&tsk->phdr) != 0;
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}
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static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
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{
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msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
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}
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static bool tsk_unreturnable(struct tipc_sock *tsk)
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{
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return msg_dest_droppable(&tsk->phdr) != 0;
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}
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static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
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{
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msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
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}
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static int tsk_importance(struct tipc_sock *tsk)
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{
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return msg_importance(&tsk->phdr);
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}
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static int tsk_set_importance(struct tipc_sock *tsk, int imp)
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{
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if (imp > TIPC_CRITICAL_IMPORTANCE)
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return -EINVAL;
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msg_set_importance(&tsk->phdr, (u32)imp);
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return 0;
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}
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static struct tipc_sock *tipc_sk(const struct sock *sk)
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{
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return container_of(sk, struct tipc_sock, sk);
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}
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static bool tsk_conn_cong(struct tipc_sock *tsk)
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{
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return tsk->snt_unacked > tsk->snd_win;
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}
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static u16 tsk_blocks(int len)
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{
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return ((len / FLOWCTL_BLK_SZ) + 1);
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}
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/* tsk_blocks(): translate a buffer size in bytes to number of
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* advertisable blocks, taking into account the ratio truesize(len)/len
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* We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
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*/
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static u16 tsk_adv_blocks(int len)
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{
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return len / FLOWCTL_BLK_SZ / 4;
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}
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/* tsk_inc(): increment counter for sent or received data
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* - If block based flow control is not supported by peer we
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* fall back to message based ditto, incrementing the counter
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*/
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static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
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{
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if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
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return ((msglen / FLOWCTL_BLK_SZ) + 1);
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return 1;
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}
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/**
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* tsk_advance_rx_queue - discard first buffer in socket receive queue
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*
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* Caller must hold socket lock
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*/
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static void tsk_advance_rx_queue(struct sock *sk)
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{
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kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
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}
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/* tipc_sk_respond() : send response message back to sender
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*/
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static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
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{
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u32 selector;
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u32 dnode;
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u32 onode = tipc_own_addr(sock_net(sk));
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if (!tipc_msg_reverse(onode, &skb, err))
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return;
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dnode = msg_destnode(buf_msg(skb));
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selector = msg_origport(buf_msg(skb));
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tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
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}
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/**
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* tsk_rej_rx_queue - reject all buffers in socket receive queue
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*
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* Caller must hold socket lock
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*/
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static void tsk_rej_rx_queue(struct sock *sk)
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{
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struct sk_buff *skb;
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while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
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tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT);
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}
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static bool tipc_sk_connected(struct sock *sk)
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{
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return sk->sk_state == TIPC_ESTABLISHED;
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}
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/* tipc_sk_type_connectionless - check if the socket is datagram socket
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* @sk: socket
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*
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* Returns true if connection less, false otherwise
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*/
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static bool tipc_sk_type_connectionless(struct sock *sk)
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{
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return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
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}
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/* tsk_peer_msg - verify if message was sent by connected port's peer
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*
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* Handles cases where the node's network address has changed from
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* the default of <0.0.0> to its configured setting.
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*/
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static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
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{
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struct sock *sk = &tsk->sk;
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struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
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u32 peer_port = tsk_peer_port(tsk);
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u32 orig_node;
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u32 peer_node;
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if (unlikely(!tipc_sk_connected(sk)))
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return false;
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if (unlikely(msg_origport(msg) != peer_port))
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return false;
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orig_node = msg_orignode(msg);
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peer_node = tsk_peer_node(tsk);
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if (likely(orig_node == peer_node))
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return true;
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if (!orig_node && (peer_node == tn->own_addr))
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return true;
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if (!peer_node && (orig_node == tn->own_addr))
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return true;
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return false;
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}
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/* tipc_set_sk_state - set the sk_state of the socket
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* @sk: socket
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*
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* Caller must hold socket lock
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*
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* Returns 0 on success, errno otherwise
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*/
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static int tipc_set_sk_state(struct sock *sk, int state)
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{
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int oldsk_state = sk->sk_state;
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int res = -EINVAL;
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switch (state) {
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case TIPC_OPEN:
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res = 0;
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break;
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case TIPC_LISTEN:
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case TIPC_CONNECTING:
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if (oldsk_state == TIPC_OPEN)
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res = 0;
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break;
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case TIPC_ESTABLISHED:
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if (oldsk_state == TIPC_CONNECTING ||
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oldsk_state == TIPC_OPEN)
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res = 0;
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break;
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case TIPC_DISCONNECTING:
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if (oldsk_state == TIPC_CONNECTING ||
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oldsk_state == TIPC_ESTABLISHED)
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res = 0;
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break;
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}
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if (!res)
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sk->sk_state = state;
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return res;
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}
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static int tipc_sk_sock_err(struct socket *sock, long *timeout)
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{
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struct sock *sk = sock->sk;
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int err = sock_error(sk);
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int typ = sock->type;
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if (err)
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return err;
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if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
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if (sk->sk_state == TIPC_DISCONNECTING)
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return -EPIPE;
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else if (!tipc_sk_connected(sk))
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return -ENOTCONN;
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}
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if (!*timeout)
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return -EAGAIN;
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if (signal_pending(current))
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return sock_intr_errno(*timeout);
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return 0;
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}
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#define tipc_wait_for_cond(sock_, timeo_, condition_) \
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({ \
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struct sock *sk_; \
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int rc_; \
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\
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while ((rc_ = !(condition_))) { \
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DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
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sk_ = (sock_)->sk; \
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rc_ = tipc_sk_sock_err((sock_), timeo_); \
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if (rc_) \
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break; \
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prepare_to_wait(sk_sleep(sk_), &wait_, TASK_INTERRUPTIBLE); \
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release_sock(sk_); \
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*(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
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sched_annotate_sleep(); \
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lock_sock(sk_); \
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remove_wait_queue(sk_sleep(sk_), &wait_); \
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} \
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rc_; \
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})
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/**
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* tipc_sk_create - create a TIPC socket
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* @net: network namespace (must be default network)
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* @sock: pre-allocated socket structure
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* @protocol: protocol indicator (must be 0)
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* @kern: caused by kernel or by userspace?
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*
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* This routine creates additional data structures used by the TIPC socket,
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* initializes them, and links them together.
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*
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* Returns 0 on success, errno otherwise
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*/
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static int tipc_sk_create(struct net *net, struct socket *sock,
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int protocol, int kern)
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{
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struct tipc_net *tn;
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const struct proto_ops *ops;
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struct sock *sk;
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struct tipc_sock *tsk;
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struct tipc_msg *msg;
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/* Validate arguments */
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if (unlikely(protocol != 0))
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return -EPROTONOSUPPORT;
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switch (sock->type) {
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case SOCK_STREAM:
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ops = &stream_ops;
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break;
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case SOCK_SEQPACKET:
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ops = &packet_ops;
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break;
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case SOCK_DGRAM:
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case SOCK_RDM:
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ops = &msg_ops;
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break;
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default:
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return -EPROTOTYPE;
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}
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/* Allocate socket's protocol area */
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sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
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if (sk == NULL)
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return -ENOMEM;
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tsk = tipc_sk(sk);
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tsk->max_pkt = MAX_PKT_DEFAULT;
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INIT_LIST_HEAD(&tsk->publications);
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INIT_LIST_HEAD(&tsk->cong_links);
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msg = &tsk->phdr;
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tn = net_generic(sock_net(sk), tipc_net_id);
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/* Finish initializing socket data structures */
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sock->ops = ops;
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sock_init_data(sock, sk);
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tipc_set_sk_state(sk, TIPC_OPEN);
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if (tipc_sk_insert(tsk)) {
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pr_warn("Socket create failed; port number exhausted\n");
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return -EINVAL;
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}
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/* Ensure tsk is visible before we read own_addr. */
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smp_mb();
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tipc_msg_init(tn->own_addr, msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG,
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NAMED_H_SIZE, 0);
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msg_set_origport(msg, tsk->portid);
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timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
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sk->sk_shutdown = 0;
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sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
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sk->sk_rcvbuf = sysctl_tipc_rmem[1];
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sk->sk_data_ready = tipc_data_ready;
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sk->sk_write_space = tipc_write_space;
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sk->sk_destruct = tipc_sock_destruct;
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tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
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tsk->group_is_open = true;
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atomic_set(&tsk->dupl_rcvcnt, 0);
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|
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/* Start out with safe limits until we receive an advertised window */
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tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
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tsk->rcv_win = tsk->snd_win;
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if (tipc_sk_type_connectionless(sk)) {
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tsk_set_unreturnable(tsk, true);
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if (sock->type == SOCK_DGRAM)
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tsk_set_unreliable(tsk, true);
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}
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return 0;
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}
|
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|
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static void tipc_sk_callback(struct rcu_head *head)
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{
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struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
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|
|
|
sock_put(&tsk->sk);
|
|
}
|
|
|
|
/* Caller should hold socket lock for the socket. */
|
|
static void __tipc_shutdown(struct socket *sock, int error)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct net *net = sock_net(sk);
|
|
long timeout = CONN_TIMEOUT_DEFAULT;
|
|
u32 dnode = tsk_peer_node(tsk);
|
|
struct sk_buff *skb;
|
|
|
|
/* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
|
|
tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
|
|
!tsk_conn_cong(tsk)));
|
|
|
|
/* Reject all unreceived messages, except on an active connection
|
|
* (which disconnects locally & sends a 'FIN+' to peer).
|
|
*/
|
|
while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
|
|
if (TIPC_SKB_CB(skb)->bytes_read) {
|
|
kfree_skb(skb);
|
|
continue;
|
|
}
|
|
if (!tipc_sk_type_connectionless(sk) &&
|
|
sk->sk_state != TIPC_DISCONNECTING) {
|
|
tipc_set_sk_state(sk, TIPC_DISCONNECTING);
|
|
tipc_node_remove_conn(net, dnode, tsk->portid);
|
|
}
|
|
tipc_sk_respond(sk, skb, error);
|
|
}
|
|
|
|
if (tipc_sk_type_connectionless(sk))
|
|
return;
|
|
|
|
if (sk->sk_state != TIPC_DISCONNECTING) {
|
|
skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
|
|
TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
|
|
tsk_own_node(tsk), tsk_peer_port(tsk),
|
|
tsk->portid, error);
|
|
if (skb)
|
|
tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
|
|
tipc_node_remove_conn(net, dnode, tsk->portid);
|
|
tipc_set_sk_state(sk, TIPC_DISCONNECTING);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tipc_release - destroy a TIPC socket
|
|
* @sock: socket to destroy
|
|
*
|
|
* This routine cleans up any messages that are still queued on the socket.
|
|
* For DGRAM and RDM socket types, all queued messages are rejected.
|
|
* For SEQPACKET and STREAM socket types, the first message is rejected
|
|
* and any others are discarded. (If the first message on a STREAM socket
|
|
* is partially-read, it is discarded and the next one is rejected instead.)
|
|
*
|
|
* NOTE: Rejected messages are not necessarily returned to the sender! They
|
|
* are returned or discarded according to the "destination droppable" setting
|
|
* specified for the message by the sender.
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
static int tipc_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk;
|
|
|
|
/*
|
|
* Exit if socket isn't fully initialized (occurs when a failed accept()
|
|
* releases a pre-allocated child socket that was never used)
|
|
*/
|
|
if (sk == NULL)
|
|
return 0;
|
|
|
|
tsk = tipc_sk(sk);
|
|
lock_sock(sk);
|
|
|
|
__tipc_shutdown(sock, TIPC_ERR_NO_PORT);
|
|
sk->sk_shutdown = SHUTDOWN_MASK;
|
|
tipc_sk_leave(tsk);
|
|
tipc_sk_withdraw(tsk, 0, NULL);
|
|
sk_stop_timer(sk, &sk->sk_timer);
|
|
tipc_sk_remove(tsk);
|
|
|
|
/* Reject any messages that accumulated in backlog queue */
|
|
release_sock(sk);
|
|
tipc_dest_list_purge(&tsk->cong_links);
|
|
tsk->cong_link_cnt = 0;
|
|
call_rcu(&tsk->rcu, tipc_sk_callback);
|
|
sock->sk = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_bind - associate or disassocate TIPC name(s) with a socket
|
|
* @sock: socket structure
|
|
* @uaddr: socket address describing name(s) and desired operation
|
|
* @uaddr_len: size of socket address data structure
|
|
*
|
|
* Name and name sequence binding is indicated using a positive scope value;
|
|
* a negative scope value unbinds the specified name. Specifying no name
|
|
* (i.e. a socket address length of 0) unbinds all names from the socket.
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*
|
|
* NOTE: This routine doesn't need to take the socket lock since it doesn't
|
|
* access any non-constant socket information.
|
|
*/
|
|
static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
|
|
int uaddr_len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
int res = -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
if (unlikely(!uaddr_len)) {
|
|
res = tipc_sk_withdraw(tsk, 0, NULL);
|
|
goto exit;
|
|
}
|
|
if (tsk->group) {
|
|
res = -EACCES;
|
|
goto exit;
|
|
}
|
|
if (uaddr_len < sizeof(struct sockaddr_tipc)) {
|
|
res = -EINVAL;
|
|
goto exit;
|
|
}
|
|
if (addr->family != AF_TIPC) {
|
|
res = -EAFNOSUPPORT;
|
|
goto exit;
|
|
}
|
|
|
|
if (addr->addrtype == TIPC_ADDR_NAME)
|
|
addr->addr.nameseq.upper = addr->addr.nameseq.lower;
|
|
else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
|
|
res = -EAFNOSUPPORT;
|
|
goto exit;
|
|
}
|
|
|
|
if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
|
|
(addr->addr.nameseq.type != TIPC_TOP_SRV) &&
|
|
(addr->addr.nameseq.type != TIPC_CFG_SRV)) {
|
|
res = -EACCES;
|
|
goto exit;
|
|
}
|
|
|
|
res = (addr->scope > 0) ?
|
|
tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
|
|
tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
|
|
exit:
|
|
release_sock(sk);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tipc_getname - get port ID of socket or peer socket
|
|
* @sock: socket structure
|
|
* @uaddr: area for returned socket address
|
|
* @uaddr_len: area for returned length of socket address
|
|
* @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*
|
|
* NOTE: This routine doesn't need to take the socket lock since it only
|
|
* accesses socket information that is unchanging (or which changes in
|
|
* a completely predictable manner).
|
|
*/
|
|
static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
|
|
int *uaddr_len, int peer)
|
|
{
|
|
struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_net *tn = net_generic(sock_net(sock->sk), tipc_net_id);
|
|
|
|
memset(addr, 0, sizeof(*addr));
|
|
if (peer) {
|
|
if ((!tipc_sk_connected(sk)) &&
|
|
((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
|
|
return -ENOTCONN;
|
|
addr->addr.id.ref = tsk_peer_port(tsk);
|
|
addr->addr.id.node = tsk_peer_node(tsk);
|
|
} else {
|
|
addr->addr.id.ref = tsk->portid;
|
|
addr->addr.id.node = tn->own_addr;
|
|
}
|
|
|
|
*uaddr_len = sizeof(*addr);
|
|
addr->addrtype = TIPC_ADDR_ID;
|
|
addr->family = AF_TIPC;
|
|
addr->scope = 0;
|
|
addr->addr.name.domain = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_poll - read and possibly block on pollmask
|
|
* @file: file structure associated with the socket
|
|
* @sock: socket for which to calculate the poll bits
|
|
* @wait: ???
|
|
*
|
|
* Returns pollmask value
|
|
*
|
|
* COMMENTARY:
|
|
* It appears that the usual socket locking mechanisms are not useful here
|
|
* since the pollmask info is potentially out-of-date the moment this routine
|
|
* exits. TCP and other protocols seem to rely on higher level poll routines
|
|
* to handle any preventable race conditions, so TIPC will do the same ...
|
|
*
|
|
* IMPORTANT: The fact that a read or write operation is indicated does NOT
|
|
* imply that the operation will succeed, merely that it should be performed
|
|
* and will not block.
|
|
*/
|
|
static __poll_t tipc_poll(struct file *file, struct socket *sock,
|
|
poll_table *wait)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
__poll_t revents = 0;
|
|
|
|
sock_poll_wait(file, sk_sleep(sk), wait);
|
|
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
|
revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
|
|
if (sk->sk_shutdown == SHUTDOWN_MASK)
|
|
revents |= EPOLLHUP;
|
|
|
|
switch (sk->sk_state) {
|
|
case TIPC_ESTABLISHED:
|
|
case TIPC_CONNECTING:
|
|
if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
|
|
revents |= EPOLLOUT;
|
|
/* fall thru' */
|
|
case TIPC_LISTEN:
|
|
if (!skb_queue_empty(&sk->sk_receive_queue))
|
|
revents |= EPOLLIN | EPOLLRDNORM;
|
|
break;
|
|
case TIPC_OPEN:
|
|
if (tsk->group_is_open && !tsk->cong_link_cnt)
|
|
revents |= EPOLLOUT;
|
|
if (!tipc_sk_type_connectionless(sk))
|
|
break;
|
|
if (skb_queue_empty(&sk->sk_receive_queue))
|
|
break;
|
|
revents |= EPOLLIN | EPOLLRDNORM;
|
|
break;
|
|
case TIPC_DISCONNECTING:
|
|
revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
|
|
break;
|
|
}
|
|
return revents;
|
|
}
|
|
|
|
/**
|
|
* tipc_sendmcast - send multicast message
|
|
* @sock: socket structure
|
|
* @seq: destination address
|
|
* @msg: message to send
|
|
* @dlen: length of data to send
|
|
* @timeout: timeout to wait for wakeup
|
|
*
|
|
* Called from function tipc_sendmsg(), which has done all sanity checks
|
|
* Returns the number of bytes sent on success, or errno
|
|
*/
|
|
static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
|
|
struct msghdr *msg, size_t dlen, long timeout)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_msg *hdr = &tsk->phdr;
|
|
struct net *net = sock_net(sk);
|
|
int mtu = tipc_bcast_get_mtu(net);
|
|
struct tipc_mc_method *method = &tsk->mc_method;
|
|
struct sk_buff_head pkts;
|
|
struct tipc_nlist dsts;
|
|
int rc;
|
|
|
|
if (tsk->group)
|
|
return -EACCES;
|
|
|
|
/* Block or return if any destination link is congested */
|
|
rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
|
|
if (unlikely(rc))
|
|
return rc;
|
|
|
|
/* Lookup destination nodes */
|
|
tipc_nlist_init(&dsts, tipc_own_addr(net));
|
|
tipc_nametbl_lookup_dst_nodes(net, seq->type, seq->lower,
|
|
seq->upper, &dsts);
|
|
if (!dsts.local && !dsts.remote)
|
|
return -EHOSTUNREACH;
|
|
|
|
/* Build message header */
|
|
msg_set_type(hdr, TIPC_MCAST_MSG);
|
|
msg_set_hdr_sz(hdr, MCAST_H_SIZE);
|
|
msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
|
|
msg_set_destport(hdr, 0);
|
|
msg_set_destnode(hdr, 0);
|
|
msg_set_nametype(hdr, seq->type);
|
|
msg_set_namelower(hdr, seq->lower);
|
|
msg_set_nameupper(hdr, seq->upper);
|
|
|
|
/* Build message as chain of buffers */
|
|
skb_queue_head_init(&pkts);
|
|
rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
|
|
|
|
/* Send message if build was successful */
|
|
if (unlikely(rc == dlen))
|
|
rc = tipc_mcast_xmit(net, &pkts, method, &dsts,
|
|
&tsk->cong_link_cnt);
|
|
|
|
tipc_nlist_purge(&dsts);
|
|
|
|
return rc ? rc : dlen;
|
|
}
|
|
|
|
/**
|
|
* tipc_send_group_msg - send a message to a member in the group
|
|
* @net: network namespace
|
|
* @m: message to send
|
|
* @mb: group member
|
|
* @dnode: destination node
|
|
* @dport: destination port
|
|
* @dlen: total length of message data
|
|
*/
|
|
static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
|
|
struct msghdr *m, struct tipc_member *mb,
|
|
u32 dnode, u32 dport, int dlen)
|
|
{
|
|
u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
|
|
struct tipc_mc_method *method = &tsk->mc_method;
|
|
int blks = tsk_blocks(GROUP_H_SIZE + dlen);
|
|
struct tipc_msg *hdr = &tsk->phdr;
|
|
struct sk_buff_head pkts;
|
|
int mtu, rc;
|
|
|
|
/* Complete message header */
|
|
msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
|
|
msg_set_hdr_sz(hdr, GROUP_H_SIZE);
|
|
msg_set_destport(hdr, dport);
|
|
msg_set_destnode(hdr, dnode);
|
|
msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
|
|
|
|
/* Build message as chain of buffers */
|
|
skb_queue_head_init(&pkts);
|
|
mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
|
|
rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
|
|
if (unlikely(rc != dlen))
|
|
return rc;
|
|
|
|
/* Send message */
|
|
rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
|
|
if (unlikely(rc == -ELINKCONG)) {
|
|
tipc_dest_push(&tsk->cong_links, dnode, 0);
|
|
tsk->cong_link_cnt++;
|
|
}
|
|
|
|
/* Update send window */
|
|
tipc_group_update_member(mb, blks);
|
|
|
|
/* A broadcast sent within next EXPIRE period must follow same path */
|
|
method->rcast = true;
|
|
method->mandatory = true;
|
|
return dlen;
|
|
}
|
|
|
|
/**
|
|
* tipc_send_group_unicast - send message to a member in the group
|
|
* @sock: socket structure
|
|
* @m: message to send
|
|
* @dlen: total length of message data
|
|
* @timeout: timeout to wait for wakeup
|
|
*
|
|
* Called from function tipc_sendmsg(), which has done all sanity checks
|
|
* Returns the number of bytes sent on success, or errno
|
|
*/
|
|
static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
|
|
int dlen, long timeout)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
|
|
int blks = tsk_blocks(GROUP_H_SIZE + dlen);
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_group *grp = tsk->group;
|
|
struct net *net = sock_net(sk);
|
|
struct tipc_member *mb = NULL;
|
|
u32 node, port;
|
|
int rc;
|
|
|
|
node = dest->addr.id.node;
|
|
port = dest->addr.id.ref;
|
|
if (!port && !node)
|
|
return -EHOSTUNREACH;
|
|
|
|
/* Block or return if destination link or member is congested */
|
|
rc = tipc_wait_for_cond(sock, &timeout,
|
|
!tipc_dest_find(&tsk->cong_links, node, 0) &&
|
|
!tipc_group_cong(grp, node, port, blks, &mb));
|
|
if (unlikely(rc))
|
|
return rc;
|
|
|
|
if (unlikely(!mb))
|
|
return -EHOSTUNREACH;
|
|
|
|
rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
|
|
|
|
return rc ? rc : dlen;
|
|
}
|
|
|
|
/**
|
|
* tipc_send_group_anycast - send message to any member with given identity
|
|
* @sock: socket structure
|
|
* @m: message to send
|
|
* @dlen: total length of message data
|
|
* @timeout: timeout to wait for wakeup
|
|
*
|
|
* Called from function tipc_sendmsg(), which has done all sanity checks
|
|
* Returns the number of bytes sent on success, or errno
|
|
*/
|
|
static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
|
|
int dlen, long timeout)
|
|
{
|
|
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct list_head *cong_links = &tsk->cong_links;
|
|
int blks = tsk_blocks(GROUP_H_SIZE + dlen);
|
|
struct tipc_group *grp = tsk->group;
|
|
struct tipc_msg *hdr = &tsk->phdr;
|
|
struct tipc_member *first = NULL;
|
|
struct tipc_member *mbr = NULL;
|
|
struct net *net = sock_net(sk);
|
|
u32 node, port, exclude;
|
|
struct list_head dsts;
|
|
u32 type, inst, scope;
|
|
int lookups = 0;
|
|
int dstcnt, rc;
|
|
bool cong;
|
|
|
|
INIT_LIST_HEAD(&dsts);
|
|
|
|
type = msg_nametype(hdr);
|
|
inst = dest->addr.name.name.instance;
|
|
scope = msg_lookup_scope(hdr);
|
|
exclude = tipc_group_exclude(grp);
|
|
|
|
while (++lookups < 4) {
|
|
first = NULL;
|
|
|
|
/* Look for a non-congested destination member, if any */
|
|
while (1) {
|
|
if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
|
|
&dstcnt, exclude, false))
|
|
return -EHOSTUNREACH;
|
|
tipc_dest_pop(&dsts, &node, &port);
|
|
cong = tipc_group_cong(grp, node, port, blks, &mbr);
|
|
if (!cong)
|
|
break;
|
|
if (mbr == first)
|
|
break;
|
|
if (!first)
|
|
first = mbr;
|
|
}
|
|
|
|
/* Start over if destination was not in member list */
|
|
if (unlikely(!mbr))
|
|
continue;
|
|
|
|
if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
|
|
break;
|
|
|
|
/* Block or return if destination link or member is congested */
|
|
rc = tipc_wait_for_cond(sock, &timeout,
|
|
!tipc_dest_find(cong_links, node, 0) &&
|
|
!tipc_group_cong(grp, node, port,
|
|
blks, &mbr));
|
|
if (unlikely(rc))
|
|
return rc;
|
|
|
|
/* Send, unless destination disappeared while waiting */
|
|
if (likely(mbr))
|
|
break;
|
|
}
|
|
|
|
if (unlikely(lookups >= 4))
|
|
return -EHOSTUNREACH;
|
|
|
|
rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
|
|
|
|
return rc ? rc : dlen;
|
|
}
|
|
|
|
/**
|
|
* tipc_send_group_bcast - send message to all members in communication group
|
|
* @sk: socket structure
|
|
* @m: message to send
|
|
* @dlen: total length of message data
|
|
* @timeout: timeout to wait for wakeup
|
|
*
|
|
* Called from function tipc_sendmsg(), which has done all sanity checks
|
|
* Returns the number of bytes sent on success, or errno
|
|
*/
|
|
static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
|
|
int dlen, long timeout)
|
|
{
|
|
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
|
|
struct sock *sk = sock->sk;
|
|
struct net *net = sock_net(sk);
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_group *grp = tsk->group;
|
|
struct tipc_nlist *dsts = tipc_group_dests(grp);
|
|
struct tipc_mc_method *method = &tsk->mc_method;
|
|
bool ack = method->mandatory && method->rcast;
|
|
int blks = tsk_blocks(MCAST_H_SIZE + dlen);
|
|
struct tipc_msg *hdr = &tsk->phdr;
|
|
int mtu = tipc_bcast_get_mtu(net);
|
|
struct sk_buff_head pkts;
|
|
int rc = -EHOSTUNREACH;
|
|
|
|
if (!dsts->local && !dsts->remote)
|
|
return -EHOSTUNREACH;
|
|
|
|
/* Block or return if any destination link or member is congested */
|
|
rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt &&
|
|
!tipc_group_bc_cong(grp, blks));
|
|
if (unlikely(rc))
|
|
return rc;
|
|
|
|
/* Complete message header */
|
|
if (dest) {
|
|
msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
|
|
msg_set_nameinst(hdr, dest->addr.name.name.instance);
|
|
} else {
|
|
msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
|
|
msg_set_nameinst(hdr, 0);
|
|
}
|
|
msg_set_hdr_sz(hdr, GROUP_H_SIZE);
|
|
msg_set_destport(hdr, 0);
|
|
msg_set_destnode(hdr, 0);
|
|
msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(grp));
|
|
|
|
/* Avoid getting stuck with repeated forced replicasts */
|
|
msg_set_grp_bc_ack_req(hdr, ack);
|
|
|
|
/* Build message as chain of buffers */
|
|
skb_queue_head_init(&pkts);
|
|
rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
|
|
if (unlikely(rc != dlen))
|
|
return rc;
|
|
|
|
/* Send message */
|
|
rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
|
|
if (unlikely(rc))
|
|
return rc;
|
|
|
|
/* Update broadcast sequence number and send windows */
|
|
tipc_group_update_bc_members(tsk->group, blks, ack);
|
|
|
|
/* Broadcast link is now free to choose method for next broadcast */
|
|
method->mandatory = false;
|
|
method->expires = jiffies;
|
|
|
|
return dlen;
|
|
}
|
|
|
|
/**
|
|
* tipc_send_group_mcast - send message to all members with given identity
|
|
* @sock: socket structure
|
|
* @m: message to send
|
|
* @dlen: total length of message data
|
|
* @timeout: timeout to wait for wakeup
|
|
*
|
|
* Called from function tipc_sendmsg(), which has done all sanity checks
|
|
* Returns the number of bytes sent on success, or errno
|
|
*/
|
|
static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
|
|
int dlen, long timeout)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_group *grp = tsk->group;
|
|
struct tipc_msg *hdr = &tsk->phdr;
|
|
struct net *net = sock_net(sk);
|
|
u32 type, inst, scope, exclude;
|
|
struct list_head dsts;
|
|
u32 dstcnt;
|
|
|
|
INIT_LIST_HEAD(&dsts);
|
|
|
|
type = msg_nametype(hdr);
|
|
inst = dest->addr.name.name.instance;
|
|
scope = msg_lookup_scope(hdr);
|
|
exclude = tipc_group_exclude(grp);
|
|
|
|
if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
|
|
&dstcnt, exclude, true))
|
|
return -EHOSTUNREACH;
|
|
|
|
if (dstcnt == 1) {
|
|
tipc_dest_pop(&dsts, &dest->addr.id.node, &dest->addr.id.ref);
|
|
return tipc_send_group_unicast(sock, m, dlen, timeout);
|
|
}
|
|
|
|
tipc_dest_list_purge(&dsts);
|
|
return tipc_send_group_bcast(sock, m, dlen, timeout);
|
|
}
|
|
|
|
/**
|
|
* tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
|
|
* @arrvq: queue with arriving messages, to be cloned after destination lookup
|
|
* @inputq: queue with cloned messages, delivered to socket after dest lookup
|
|
*
|
|
* Multi-threaded: parallel calls with reference to same queues may occur
|
|
*/
|
|
void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
|
|
struct sk_buff_head *inputq)
|
|
{
|
|
u32 self = tipc_own_addr(net);
|
|
u32 type, lower, upper, scope;
|
|
struct sk_buff *skb, *_skb;
|
|
u32 portid, oport, onode;
|
|
struct sk_buff_head tmpq;
|
|
struct list_head dports;
|
|
struct tipc_msg *hdr;
|
|
int user, mtyp, hlen;
|
|
bool exact;
|
|
|
|
__skb_queue_head_init(&tmpq);
|
|
INIT_LIST_HEAD(&dports);
|
|
|
|
skb = tipc_skb_peek(arrvq, &inputq->lock);
|
|
for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
|
|
hdr = buf_msg(skb);
|
|
user = msg_user(hdr);
|
|
mtyp = msg_type(hdr);
|
|
hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
|
|
oport = msg_origport(hdr);
|
|
onode = msg_orignode(hdr);
|
|
type = msg_nametype(hdr);
|
|
|
|
if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
|
|
spin_lock_bh(&inputq->lock);
|
|
if (skb_peek(arrvq) == skb) {
|
|
__skb_dequeue(arrvq);
|
|
__skb_queue_tail(inputq, skb);
|
|
}
|
|
kfree_skb(skb);
|
|
spin_unlock_bh(&inputq->lock);
|
|
continue;
|
|
}
|
|
|
|
/* Group messages require exact scope match */
|
|
if (msg_in_group(hdr)) {
|
|
lower = 0;
|
|
upper = ~0;
|
|
scope = msg_lookup_scope(hdr);
|
|
exact = true;
|
|
} else {
|
|
/* TIPC_NODE_SCOPE means "any scope" in this context */
|
|
if (onode == self)
|
|
scope = TIPC_NODE_SCOPE;
|
|
else
|
|
scope = TIPC_CLUSTER_SCOPE;
|
|
exact = false;
|
|
lower = msg_namelower(hdr);
|
|
upper = msg_nameupper(hdr);
|
|
}
|
|
|
|
/* Create destination port list: */
|
|
tipc_nametbl_mc_lookup(net, type, lower, upper,
|
|
scope, exact, &dports);
|
|
|
|
/* Clone message per destination */
|
|
while (tipc_dest_pop(&dports, NULL, &portid)) {
|
|
_skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
|
|
if (_skb) {
|
|
msg_set_destport(buf_msg(_skb), portid);
|
|
__skb_queue_tail(&tmpq, _skb);
|
|
continue;
|
|
}
|
|
pr_warn("Failed to clone mcast rcv buffer\n");
|
|
}
|
|
/* Append to inputq if not already done by other thread */
|
|
spin_lock_bh(&inputq->lock);
|
|
if (skb_peek(arrvq) == skb) {
|
|
skb_queue_splice_tail_init(&tmpq, inputq);
|
|
kfree_skb(__skb_dequeue(arrvq));
|
|
}
|
|
spin_unlock_bh(&inputq->lock);
|
|
__skb_queue_purge(&tmpq);
|
|
kfree_skb(skb);
|
|
}
|
|
tipc_sk_rcv(net, inputq);
|
|
}
|
|
|
|
/**
|
|
* tipc_sk_conn_proto_rcv - receive a connection mng protocol message
|
|
* @tsk: receiving socket
|
|
* @skb: pointer to message buffer.
|
|
*/
|
|
static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
|
|
struct sk_buff_head *xmitq)
|
|
{
|
|
struct tipc_msg *hdr = buf_msg(skb);
|
|
u32 onode = tsk_own_node(tsk);
|
|
struct sock *sk = &tsk->sk;
|
|
int mtyp = msg_type(hdr);
|
|
bool conn_cong;
|
|
|
|
/* Ignore if connection cannot be validated: */
|
|
if (!tsk_peer_msg(tsk, hdr))
|
|
goto exit;
|
|
|
|
if (unlikely(msg_errcode(hdr))) {
|
|
tipc_set_sk_state(sk, TIPC_DISCONNECTING);
|
|
tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
|
|
tsk_peer_port(tsk));
|
|
sk->sk_state_change(sk);
|
|
goto exit;
|
|
}
|
|
|
|
tsk->probe_unacked = false;
|
|
|
|
if (mtyp == CONN_PROBE) {
|
|
msg_set_type(hdr, CONN_PROBE_REPLY);
|
|
if (tipc_msg_reverse(onode, &skb, TIPC_OK))
|
|
__skb_queue_tail(xmitq, skb);
|
|
return;
|
|
} else if (mtyp == CONN_ACK) {
|
|
conn_cong = tsk_conn_cong(tsk);
|
|
tsk->snt_unacked -= msg_conn_ack(hdr);
|
|
if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
|
|
tsk->snd_win = msg_adv_win(hdr);
|
|
if (conn_cong)
|
|
sk->sk_write_space(sk);
|
|
} else if (mtyp != CONN_PROBE_REPLY) {
|
|
pr_warn("Received unknown CONN_PROTO msg\n");
|
|
}
|
|
exit:
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
/**
|
|
* tipc_sendmsg - send message in connectionless manner
|
|
* @sock: socket structure
|
|
* @m: message to send
|
|
* @dsz: amount of user data to be sent
|
|
*
|
|
* Message must have an destination specified explicitly.
|
|
* Used for SOCK_RDM and SOCK_DGRAM messages,
|
|
* and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
|
|
* (Note: 'SYN+' is prohibited on SOCK_STREAM.)
|
|
*
|
|
* Returns the number of bytes sent on success, or errno otherwise
|
|
*/
|
|
static int tipc_sendmsg(struct socket *sock,
|
|
struct msghdr *m, size_t dsz)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int ret;
|
|
|
|
lock_sock(sk);
|
|
ret = __tipc_sendmsg(sock, m, dsz);
|
|
release_sock(sk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct net *net = sock_net(sk);
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
|
|
long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
|
|
struct list_head *clinks = &tsk->cong_links;
|
|
bool syn = !tipc_sk_type_connectionless(sk);
|
|
struct tipc_group *grp = tsk->group;
|
|
struct tipc_msg *hdr = &tsk->phdr;
|
|
struct tipc_name_seq *seq;
|
|
struct sk_buff_head pkts;
|
|
u32 type, inst, domain;
|
|
u32 dnode, dport;
|
|
int mtu, rc;
|
|
|
|
if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
|
|
return -EMSGSIZE;
|
|
|
|
if (likely(dest)) {
|
|
if (unlikely(m->msg_namelen < sizeof(*dest)))
|
|
return -EINVAL;
|
|
if (unlikely(dest->family != AF_TIPC))
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (grp) {
|
|
if (!dest)
|
|
return tipc_send_group_bcast(sock, m, dlen, timeout);
|
|
if (dest->addrtype == TIPC_ADDR_NAME)
|
|
return tipc_send_group_anycast(sock, m, dlen, timeout);
|
|
if (dest->addrtype == TIPC_ADDR_ID)
|
|
return tipc_send_group_unicast(sock, m, dlen, timeout);
|
|
if (dest->addrtype == TIPC_ADDR_MCAST)
|
|
return tipc_send_group_mcast(sock, m, dlen, timeout);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (unlikely(!dest)) {
|
|
dest = &tsk->peer;
|
|
if (!syn || dest->family != AF_TIPC)
|
|
return -EDESTADDRREQ;
|
|
}
|
|
|
|
if (unlikely(syn)) {
|
|
if (sk->sk_state == TIPC_LISTEN)
|
|
return -EPIPE;
|
|
if (sk->sk_state != TIPC_OPEN)
|
|
return -EISCONN;
|
|
if (tsk->published)
|
|
return -EOPNOTSUPP;
|
|
if (dest->addrtype == TIPC_ADDR_NAME) {
|
|
tsk->conn_type = dest->addr.name.name.type;
|
|
tsk->conn_instance = dest->addr.name.name.instance;
|
|
}
|
|
}
|
|
|
|
seq = &dest->addr.nameseq;
|
|
if (dest->addrtype == TIPC_ADDR_MCAST)
|
|
return tipc_sendmcast(sock, seq, m, dlen, timeout);
|
|
|
|
if (dest->addrtype == TIPC_ADDR_NAME) {
|
|
type = dest->addr.name.name.type;
|
|
inst = dest->addr.name.name.instance;
|
|
domain = dest->addr.name.domain;
|
|
dnode = domain;
|
|
msg_set_type(hdr, TIPC_NAMED_MSG);
|
|
msg_set_hdr_sz(hdr, NAMED_H_SIZE);
|
|
msg_set_nametype(hdr, type);
|
|
msg_set_nameinst(hdr, inst);
|
|
msg_set_lookup_scope(hdr, tipc_addr_scope(domain));
|
|
dport = tipc_nametbl_translate(net, type, inst, &dnode);
|
|
msg_set_destnode(hdr, dnode);
|
|
msg_set_destport(hdr, dport);
|
|
if (unlikely(!dport && !dnode))
|
|
return -EHOSTUNREACH;
|
|
} else if (dest->addrtype == TIPC_ADDR_ID) {
|
|
dnode = dest->addr.id.node;
|
|
msg_set_type(hdr, TIPC_DIRECT_MSG);
|
|
msg_set_lookup_scope(hdr, 0);
|
|
msg_set_destnode(hdr, dnode);
|
|
msg_set_destport(hdr, dest->addr.id.ref);
|
|
msg_set_hdr_sz(hdr, BASIC_H_SIZE);
|
|
}
|
|
|
|
/* Block or return if destination link is congested */
|
|
rc = tipc_wait_for_cond(sock, &timeout,
|
|
!tipc_dest_find(clinks, dnode, 0));
|
|
if (unlikely(rc))
|
|
return rc;
|
|
|
|
skb_queue_head_init(&pkts);
|
|
mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
|
|
rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
|
|
if (unlikely(rc != dlen))
|
|
return rc;
|
|
|
|
rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
|
|
if (unlikely(rc == -ELINKCONG)) {
|
|
tipc_dest_push(clinks, dnode, 0);
|
|
tsk->cong_link_cnt++;
|
|
rc = 0;
|
|
}
|
|
|
|
if (unlikely(syn && !rc))
|
|
tipc_set_sk_state(sk, TIPC_CONNECTING);
|
|
|
|
return rc ? rc : dlen;
|
|
}
|
|
|
|
/**
|
|
* tipc_sendstream - send stream-oriented data
|
|
* @sock: socket structure
|
|
* @m: data to send
|
|
* @dsz: total length of data to be transmitted
|
|
*
|
|
* Used for SOCK_STREAM data.
|
|
*
|
|
* Returns the number of bytes sent on success (or partial success),
|
|
* or errno if no data sent
|
|
*/
|
|
static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int ret;
|
|
|
|
lock_sock(sk);
|
|
ret = __tipc_sendstream(sock, m, dsz);
|
|
release_sock(sk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
|
|
long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_msg *hdr = &tsk->phdr;
|
|
struct net *net = sock_net(sk);
|
|
struct sk_buff_head pkts;
|
|
u32 dnode = tsk_peer_node(tsk);
|
|
int send, sent = 0;
|
|
int rc = 0;
|
|
|
|
skb_queue_head_init(&pkts);
|
|
|
|
if (unlikely(dlen > INT_MAX))
|
|
return -EMSGSIZE;
|
|
|
|
/* Handle implicit connection setup */
|
|
if (unlikely(dest)) {
|
|
rc = __tipc_sendmsg(sock, m, dlen);
|
|
if (dlen && (dlen == rc))
|
|
tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
|
|
return rc;
|
|
}
|
|
|
|
do {
|
|
rc = tipc_wait_for_cond(sock, &timeout,
|
|
(!tsk->cong_link_cnt &&
|
|
!tsk_conn_cong(tsk) &&
|
|
tipc_sk_connected(sk)));
|
|
if (unlikely(rc))
|
|
break;
|
|
|
|
send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
|
|
rc = tipc_msg_build(hdr, m, sent, send, tsk->max_pkt, &pkts);
|
|
if (unlikely(rc != send))
|
|
break;
|
|
|
|
rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
|
|
if (unlikely(rc == -ELINKCONG)) {
|
|
tsk->cong_link_cnt = 1;
|
|
rc = 0;
|
|
}
|
|
if (likely(!rc)) {
|
|
tsk->snt_unacked += tsk_inc(tsk, send + MIN_H_SIZE);
|
|
sent += send;
|
|
}
|
|
} while (sent < dlen && !rc);
|
|
|
|
return sent ? sent : rc;
|
|
}
|
|
|
|
/**
|
|
* tipc_send_packet - send a connection-oriented message
|
|
* @sock: socket structure
|
|
* @m: message to send
|
|
* @dsz: length of data to be transmitted
|
|
*
|
|
* Used for SOCK_SEQPACKET messages.
|
|
*
|
|
* Returns the number of bytes sent on success, or errno otherwise
|
|
*/
|
|
static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
|
|
{
|
|
if (dsz > TIPC_MAX_USER_MSG_SIZE)
|
|
return -EMSGSIZE;
|
|
|
|
return tipc_sendstream(sock, m, dsz);
|
|
}
|
|
|
|
/* tipc_sk_finish_conn - complete the setup of a connection
|
|
*/
|
|
static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
|
|
u32 peer_node)
|
|
{
|
|
struct sock *sk = &tsk->sk;
|
|
struct net *net = sock_net(sk);
|
|
struct tipc_msg *msg = &tsk->phdr;
|
|
|
|
msg_set_destnode(msg, peer_node);
|
|
msg_set_destport(msg, peer_port);
|
|
msg_set_type(msg, TIPC_CONN_MSG);
|
|
msg_set_lookup_scope(msg, 0);
|
|
msg_set_hdr_sz(msg, SHORT_H_SIZE);
|
|
|
|
sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
|
|
tipc_set_sk_state(sk, TIPC_ESTABLISHED);
|
|
tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
|
|
tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid);
|
|
tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
|
|
if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
|
|
return;
|
|
|
|
/* Fall back to message based flow control */
|
|
tsk->rcv_win = FLOWCTL_MSG_WIN;
|
|
tsk->snd_win = FLOWCTL_MSG_WIN;
|
|
}
|
|
|
|
/**
|
|
* tipc_sk_set_orig_addr - capture sender's address for received message
|
|
* @m: descriptor for message info
|
|
* @hdr: received message header
|
|
*
|
|
* Note: Address is not captured if not requested by receiver.
|
|
*/
|
|
static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
|
|
{
|
|
DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
|
|
struct tipc_msg *hdr = buf_msg(skb);
|
|
|
|
if (!srcaddr)
|
|
return;
|
|
|
|
srcaddr->sock.family = AF_TIPC;
|
|
srcaddr->sock.addrtype = TIPC_ADDR_ID;
|
|
srcaddr->sock.addr.id.ref = msg_origport(hdr);
|
|
srcaddr->sock.addr.id.node = msg_orignode(hdr);
|
|
srcaddr->sock.addr.name.domain = 0;
|
|
srcaddr->sock.scope = 0;
|
|
m->msg_namelen = sizeof(struct sockaddr_tipc);
|
|
|
|
if (!msg_in_group(hdr))
|
|
return;
|
|
|
|
/* Group message users may also want to know sending member's id */
|
|
srcaddr->member.family = AF_TIPC;
|
|
srcaddr->member.addrtype = TIPC_ADDR_NAME;
|
|
srcaddr->member.addr.name.name.type = msg_nametype(hdr);
|
|
srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
|
|
srcaddr->member.addr.name.domain = 0;
|
|
m->msg_namelen = sizeof(*srcaddr);
|
|
}
|
|
|
|
/**
|
|
* tipc_sk_anc_data_recv - optionally capture ancillary data for received message
|
|
* @m: descriptor for message info
|
|
* @msg: received message header
|
|
* @tsk: TIPC port associated with message
|
|
*
|
|
* Note: Ancillary data is not captured if not requested by receiver.
|
|
*
|
|
* Returns 0 if successful, otherwise errno
|
|
*/
|
|
static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
|
|
struct tipc_sock *tsk)
|
|
{
|
|
u32 anc_data[3];
|
|
u32 err;
|
|
u32 dest_type;
|
|
int has_name;
|
|
int res;
|
|
|
|
if (likely(m->msg_controllen == 0))
|
|
return 0;
|
|
|
|
/* Optionally capture errored message object(s) */
|
|
err = msg ? msg_errcode(msg) : 0;
|
|
if (unlikely(err)) {
|
|
anc_data[0] = err;
|
|
anc_data[1] = msg_data_sz(msg);
|
|
res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
|
|
if (res)
|
|
return res;
|
|
if (anc_data[1]) {
|
|
res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
|
|
msg_data(msg));
|
|
if (res)
|
|
return res;
|
|
}
|
|
}
|
|
|
|
/* Optionally capture message destination object */
|
|
dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
|
|
switch (dest_type) {
|
|
case TIPC_NAMED_MSG:
|
|
has_name = 1;
|
|
anc_data[0] = msg_nametype(msg);
|
|
anc_data[1] = msg_namelower(msg);
|
|
anc_data[2] = msg_namelower(msg);
|
|
break;
|
|
case TIPC_MCAST_MSG:
|
|
has_name = 1;
|
|
anc_data[0] = msg_nametype(msg);
|
|
anc_data[1] = msg_namelower(msg);
|
|
anc_data[2] = msg_nameupper(msg);
|
|
break;
|
|
case TIPC_CONN_MSG:
|
|
has_name = (tsk->conn_type != 0);
|
|
anc_data[0] = tsk->conn_type;
|
|
anc_data[1] = tsk->conn_instance;
|
|
anc_data[2] = tsk->conn_instance;
|
|
break;
|
|
default:
|
|
has_name = 0;
|
|
}
|
|
if (has_name) {
|
|
res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
|
|
if (res)
|
|
return res;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tipc_sk_send_ack(struct tipc_sock *tsk)
|
|
{
|
|
struct sock *sk = &tsk->sk;
|
|
struct net *net = sock_net(sk);
|
|
struct sk_buff *skb = NULL;
|
|
struct tipc_msg *msg;
|
|
u32 peer_port = tsk_peer_port(tsk);
|
|
u32 dnode = tsk_peer_node(tsk);
|
|
|
|
if (!tipc_sk_connected(sk))
|
|
return;
|
|
skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
|
|
dnode, tsk_own_node(tsk), peer_port,
|
|
tsk->portid, TIPC_OK);
|
|
if (!skb)
|
|
return;
|
|
msg = buf_msg(skb);
|
|
msg_set_conn_ack(msg, tsk->rcv_unacked);
|
|
tsk->rcv_unacked = 0;
|
|
|
|
/* Adjust to and advertize the correct window limit */
|
|
if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
|
|
tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
|
|
msg_set_adv_win(msg, tsk->rcv_win);
|
|
}
|
|
tipc_node_xmit_skb(net, skb, dnode, msg_link_selector(msg));
|
|
}
|
|
|
|
static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
DEFINE_WAIT(wait);
|
|
long timeo = *timeop;
|
|
int err = sock_error(sk);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
for (;;) {
|
|
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
|
|
if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN) {
|
|
err = -ENOTCONN;
|
|
break;
|
|
}
|
|
release_sock(sk);
|
|
timeo = schedule_timeout(timeo);
|
|
lock_sock(sk);
|
|
}
|
|
err = 0;
|
|
if (!skb_queue_empty(&sk->sk_receive_queue))
|
|
break;
|
|
err = -EAGAIN;
|
|
if (!timeo)
|
|
break;
|
|
err = sock_intr_errno(timeo);
|
|
if (signal_pending(current))
|
|
break;
|
|
|
|
err = sock_error(sk);
|
|
if (err)
|
|
break;
|
|
}
|
|
finish_wait(sk_sleep(sk), &wait);
|
|
*timeop = timeo;
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* tipc_recvmsg - receive packet-oriented message
|
|
* @m: descriptor for message info
|
|
* @buflen: length of user buffer area
|
|
* @flags: receive flags
|
|
*
|
|
* Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
|
|
* If the complete message doesn't fit in user area, truncate it.
|
|
*
|
|
* Returns size of returned message data, errno otherwise
|
|
*/
|
|
static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
|
|
size_t buflen, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
bool connected = !tipc_sk_type_connectionless(sk);
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
int rc, err, hlen, dlen, copy;
|
|
struct sk_buff_head xmitq;
|
|
struct tipc_msg *hdr;
|
|
struct sk_buff *skb;
|
|
bool grp_evt;
|
|
long timeout;
|
|
|
|
/* Catch invalid receive requests */
|
|
if (unlikely(!buflen))
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
|
|
rc = -ENOTCONN;
|
|
goto exit;
|
|
}
|
|
timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
|
|
|
|
/* Step rcv queue to first msg with data or error; wait if necessary */
|
|
do {
|
|
rc = tipc_wait_for_rcvmsg(sock, &timeout);
|
|
if (unlikely(rc))
|
|
goto exit;
|
|
skb = skb_peek(&sk->sk_receive_queue);
|
|
hdr = buf_msg(skb);
|
|
dlen = msg_data_sz(hdr);
|
|
hlen = msg_hdr_sz(hdr);
|
|
err = msg_errcode(hdr);
|
|
grp_evt = msg_is_grp_evt(hdr);
|
|
if (likely(dlen || err))
|
|
break;
|
|
tsk_advance_rx_queue(sk);
|
|
} while (1);
|
|
|
|
/* Collect msg meta data, including error code and rejected data */
|
|
tipc_sk_set_orig_addr(m, skb);
|
|
rc = tipc_sk_anc_data_recv(m, hdr, tsk);
|
|
if (unlikely(rc))
|
|
goto exit;
|
|
|
|
/* Capture data if non-error msg, otherwise just set return value */
|
|
if (likely(!err)) {
|
|
copy = min_t(int, dlen, buflen);
|
|
if (unlikely(copy != dlen))
|
|
m->msg_flags |= MSG_TRUNC;
|
|
rc = skb_copy_datagram_msg(skb, hlen, m, copy);
|
|
} else {
|
|
copy = 0;
|
|
rc = 0;
|
|
if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control)
|
|
rc = -ECONNRESET;
|
|
}
|
|
if (unlikely(rc))
|
|
goto exit;
|
|
|
|
/* Mark message as group event if applicable */
|
|
if (unlikely(grp_evt)) {
|
|
if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
|
|
m->msg_flags |= MSG_EOR;
|
|
m->msg_flags |= MSG_OOB;
|
|
copy = 0;
|
|
}
|
|
|
|
/* Caption of data or error code/rejected data was successful */
|
|
if (unlikely(flags & MSG_PEEK))
|
|
goto exit;
|
|
|
|
/* Send group flow control advertisement when applicable */
|
|
if (tsk->group && msg_in_group(hdr) && !grp_evt) {
|
|
skb_queue_head_init(&xmitq);
|
|
tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
|
|
msg_orignode(hdr), msg_origport(hdr),
|
|
&xmitq);
|
|
tipc_node_distr_xmit(sock_net(sk), &xmitq);
|
|
}
|
|
|
|
tsk_advance_rx_queue(sk);
|
|
|
|
if (likely(!connected))
|
|
goto exit;
|
|
|
|
/* Send connection flow control advertisement when applicable */
|
|
tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
|
|
if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
|
|
tipc_sk_send_ack(tsk);
|
|
exit:
|
|
release_sock(sk);
|
|
return rc ? rc : copy;
|
|
}
|
|
|
|
/**
|
|
* tipc_recvstream - receive stream-oriented data
|
|
* @m: descriptor for message info
|
|
* @buflen: total size of user buffer area
|
|
* @flags: receive flags
|
|
*
|
|
* Used for SOCK_STREAM messages only. If not enough data is available
|
|
* will optionally wait for more; never truncates data.
|
|
*
|
|
* Returns size of returned message data, errno otherwise
|
|
*/
|
|
static int tipc_recvstream(struct socket *sock, struct msghdr *m,
|
|
size_t buflen, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct sk_buff *skb;
|
|
struct tipc_msg *hdr;
|
|
struct tipc_skb_cb *skb_cb;
|
|
bool peek = flags & MSG_PEEK;
|
|
int offset, required, copy, copied = 0;
|
|
int hlen, dlen, err, rc;
|
|
long timeout;
|
|
|
|
/* Catch invalid receive attempts */
|
|
if (unlikely(!buflen))
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (unlikely(sk->sk_state == TIPC_OPEN)) {
|
|
rc = -ENOTCONN;
|
|
goto exit;
|
|
}
|
|
required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
|
|
timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
|
|
|
|
do {
|
|
/* Look at first msg in receive queue; wait if necessary */
|
|
rc = tipc_wait_for_rcvmsg(sock, &timeout);
|
|
if (unlikely(rc))
|
|
break;
|
|
skb = skb_peek(&sk->sk_receive_queue);
|
|
skb_cb = TIPC_SKB_CB(skb);
|
|
hdr = buf_msg(skb);
|
|
dlen = msg_data_sz(hdr);
|
|
hlen = msg_hdr_sz(hdr);
|
|
err = msg_errcode(hdr);
|
|
|
|
/* Discard any empty non-errored (SYN-) message */
|
|
if (unlikely(!dlen && !err)) {
|
|
tsk_advance_rx_queue(sk);
|
|
continue;
|
|
}
|
|
|
|
/* Collect msg meta data, incl. error code and rejected data */
|
|
if (!copied) {
|
|
tipc_sk_set_orig_addr(m, skb);
|
|
rc = tipc_sk_anc_data_recv(m, hdr, tsk);
|
|
if (rc)
|
|
break;
|
|
}
|
|
|
|
/* Copy data if msg ok, otherwise return error/partial data */
|
|
if (likely(!err)) {
|
|
offset = skb_cb->bytes_read;
|
|
copy = min_t(int, dlen - offset, buflen - copied);
|
|
rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
|
|
if (unlikely(rc))
|
|
break;
|
|
copied += copy;
|
|
offset += copy;
|
|
if (unlikely(offset < dlen)) {
|
|
if (!peek)
|
|
skb_cb->bytes_read = offset;
|
|
break;
|
|
}
|
|
} else {
|
|
rc = 0;
|
|
if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
|
|
rc = -ECONNRESET;
|
|
if (copied || rc)
|
|
break;
|
|
}
|
|
|
|
if (unlikely(peek))
|
|
break;
|
|
|
|
tsk_advance_rx_queue(sk);
|
|
|
|
/* Send connection flow control advertisement when applicable */
|
|
tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
|
|
if (unlikely(tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE))
|
|
tipc_sk_send_ack(tsk);
|
|
|
|
/* Exit if all requested data or FIN/error received */
|
|
if (copied == buflen || err)
|
|
break;
|
|
|
|
} while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
|
|
exit:
|
|
release_sock(sk);
|
|
return copied ? copied : rc;
|
|
}
|
|
|
|
/**
|
|
* tipc_write_space - wake up thread if port congestion is released
|
|
* @sk: socket
|
|
*/
|
|
static void tipc_write_space(struct sock *sk)
|
|
{
|
|
struct socket_wq *wq;
|
|
|
|
rcu_read_lock();
|
|
wq = rcu_dereference(sk->sk_wq);
|
|
if (skwq_has_sleeper(wq))
|
|
wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
|
|
EPOLLWRNORM | EPOLLWRBAND);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/**
|
|
* tipc_data_ready - wake up threads to indicate messages have been received
|
|
* @sk: socket
|
|
* @len: the length of messages
|
|
*/
|
|
static void tipc_data_ready(struct sock *sk)
|
|
{
|
|
struct socket_wq *wq;
|
|
|
|
rcu_read_lock();
|
|
wq = rcu_dereference(sk->sk_wq);
|
|
if (skwq_has_sleeper(wq))
|
|
wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
|
|
EPOLLRDNORM | EPOLLRDBAND);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void tipc_sock_destruct(struct sock *sk)
|
|
{
|
|
__skb_queue_purge(&sk->sk_receive_queue);
|
|
}
|
|
|
|
static void tipc_sk_proto_rcv(struct sock *sk,
|
|
struct sk_buff_head *inputq,
|
|
struct sk_buff_head *xmitq)
|
|
{
|
|
struct sk_buff *skb = __skb_dequeue(inputq);
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_msg *hdr = buf_msg(skb);
|
|
struct tipc_group *grp = tsk->group;
|
|
bool wakeup = false;
|
|
|
|
switch (msg_user(hdr)) {
|
|
case CONN_MANAGER:
|
|
tipc_sk_conn_proto_rcv(tsk, skb, xmitq);
|
|
return;
|
|
case SOCK_WAKEUP:
|
|
tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
|
|
tsk->cong_link_cnt--;
|
|
wakeup = true;
|
|
break;
|
|
case GROUP_PROTOCOL:
|
|
tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
|
|
break;
|
|
case TOP_SRV:
|
|
tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
|
|
hdr, inputq, xmitq);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (wakeup)
|
|
sk->sk_write_space(sk);
|
|
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
/**
|
|
* tipc_filter_connect - Handle incoming message for a connection-based socket
|
|
* @tsk: TIPC socket
|
|
* @skb: pointer to message buffer. Set to NULL if buffer is consumed
|
|
*
|
|
* Returns true if everything ok, false otherwise
|
|
*/
|
|
static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb)
|
|
{
|
|
struct sock *sk = &tsk->sk;
|
|
struct net *net = sock_net(sk);
|
|
struct tipc_msg *hdr = buf_msg(skb);
|
|
u32 pport = msg_origport(hdr);
|
|
u32 pnode = msg_orignode(hdr);
|
|
|
|
if (unlikely(msg_mcast(hdr)))
|
|
return false;
|
|
|
|
switch (sk->sk_state) {
|
|
case TIPC_CONNECTING:
|
|
/* Accept only ACK or NACK message */
|
|
if (unlikely(!msg_connected(hdr))) {
|
|
if (pport != tsk_peer_port(tsk) ||
|
|
pnode != tsk_peer_node(tsk))
|
|
return false;
|
|
|
|
tipc_set_sk_state(sk, TIPC_DISCONNECTING);
|
|
sk->sk_err = ECONNREFUSED;
|
|
sk->sk_state_change(sk);
|
|
return true;
|
|
}
|
|
|
|
if (unlikely(msg_errcode(hdr))) {
|
|
tipc_set_sk_state(sk, TIPC_DISCONNECTING);
|
|
sk->sk_err = ECONNREFUSED;
|
|
sk->sk_state_change(sk);
|
|
return true;
|
|
}
|
|
|
|
if (unlikely(!msg_isdata(hdr))) {
|
|
tipc_set_sk_state(sk, TIPC_DISCONNECTING);
|
|
sk->sk_err = EINVAL;
|
|
sk->sk_state_change(sk);
|
|
return true;
|
|
}
|
|
|
|
tipc_sk_finish_conn(tsk, msg_origport(hdr), msg_orignode(hdr));
|
|
msg_set_importance(&tsk->phdr, msg_importance(hdr));
|
|
|
|
/* If 'ACK+' message, add to socket receive queue */
|
|
if (msg_data_sz(hdr))
|
|
return true;
|
|
|
|
/* If empty 'ACK-' message, wake up sleeping connect() */
|
|
sk->sk_data_ready(sk);
|
|
|
|
/* 'ACK-' message is neither accepted nor rejected: */
|
|
msg_set_dest_droppable(hdr, 1);
|
|
return false;
|
|
|
|
case TIPC_OPEN:
|
|
case TIPC_DISCONNECTING:
|
|
break;
|
|
case TIPC_LISTEN:
|
|
/* Accept only SYN message */
|
|
if (!msg_connected(hdr) && !(msg_errcode(hdr)))
|
|
return true;
|
|
break;
|
|
case TIPC_ESTABLISHED:
|
|
/* Accept only connection-based messages sent by peer */
|
|
if (unlikely(!tsk_peer_msg(tsk, hdr)))
|
|
return false;
|
|
|
|
if (unlikely(msg_errcode(hdr))) {
|
|
tipc_set_sk_state(sk, TIPC_DISCONNECTING);
|
|
/* Let timer expire on it's own */
|
|
tipc_node_remove_conn(net, tsk_peer_node(tsk),
|
|
tsk->portid);
|
|
sk->sk_state_change(sk);
|
|
}
|
|
return true;
|
|
default:
|
|
pr_err("Unknown sk_state %u\n", sk->sk_state);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* rcvbuf_limit - get proper overload limit of socket receive queue
|
|
* @sk: socket
|
|
* @skb: message
|
|
*
|
|
* For connection oriented messages, irrespective of importance,
|
|
* default queue limit is 2 MB.
|
|
*
|
|
* For connectionless messages, queue limits are based on message
|
|
* importance as follows:
|
|
*
|
|
* TIPC_LOW_IMPORTANCE (2 MB)
|
|
* TIPC_MEDIUM_IMPORTANCE (4 MB)
|
|
* TIPC_HIGH_IMPORTANCE (8 MB)
|
|
* TIPC_CRITICAL_IMPORTANCE (16 MB)
|
|
*
|
|
* Returns overload limit according to corresponding message importance
|
|
*/
|
|
static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_msg *hdr = buf_msg(skb);
|
|
|
|
if (unlikely(msg_in_group(hdr)))
|
|
return sk->sk_rcvbuf;
|
|
|
|
if (unlikely(!msg_connected(hdr)))
|
|
return sk->sk_rcvbuf << msg_importance(hdr);
|
|
|
|
if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
|
|
return sk->sk_rcvbuf;
|
|
|
|
return FLOWCTL_MSG_LIM;
|
|
}
|
|
|
|
/**
|
|
* tipc_sk_filter_rcv - validate incoming message
|
|
* @sk: socket
|
|
* @skb: pointer to message.
|
|
*
|
|
* Enqueues message on receive queue if acceptable; optionally handles
|
|
* disconnect indication for a connected socket.
|
|
*
|
|
* Called with socket lock already taken
|
|
*
|
|
*/
|
|
static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
|
|
struct sk_buff_head *xmitq)
|
|
{
|
|
bool sk_conn = !tipc_sk_type_connectionless(sk);
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_group *grp = tsk->group;
|
|
struct tipc_msg *hdr = buf_msg(skb);
|
|
struct net *net = sock_net(sk);
|
|
struct sk_buff_head inputq;
|
|
int limit, err = TIPC_OK;
|
|
|
|
TIPC_SKB_CB(skb)->bytes_read = 0;
|
|
__skb_queue_head_init(&inputq);
|
|
__skb_queue_tail(&inputq, skb);
|
|
|
|
if (unlikely(!msg_isdata(hdr)))
|
|
tipc_sk_proto_rcv(sk, &inputq, xmitq);
|
|
|
|
if (unlikely(grp))
|
|
tipc_group_filter_msg(grp, &inputq, xmitq);
|
|
|
|
/* Validate and add to receive buffer if there is space */
|
|
while ((skb = __skb_dequeue(&inputq))) {
|
|
hdr = buf_msg(skb);
|
|
limit = rcvbuf_limit(sk, skb);
|
|
if ((sk_conn && !tipc_sk_filter_connect(tsk, skb)) ||
|
|
(!sk_conn && msg_connected(hdr)) ||
|
|
(!grp && msg_in_group(hdr)))
|
|
err = TIPC_ERR_NO_PORT;
|
|
else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit)
|
|
err = TIPC_ERR_OVERLOAD;
|
|
|
|
if (unlikely(err)) {
|
|
tipc_skb_reject(net, err, skb, xmitq);
|
|
err = TIPC_OK;
|
|
continue;
|
|
}
|
|
__skb_queue_tail(&sk->sk_receive_queue, skb);
|
|
skb_set_owner_r(skb, sk);
|
|
sk->sk_data_ready(sk);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tipc_sk_backlog_rcv - handle incoming message from backlog queue
|
|
* @sk: socket
|
|
* @skb: message
|
|
*
|
|
* Caller must hold socket lock
|
|
*/
|
|
static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
unsigned int before = sk_rmem_alloc_get(sk);
|
|
struct sk_buff_head xmitq;
|
|
unsigned int added;
|
|
|
|
__skb_queue_head_init(&xmitq);
|
|
|
|
tipc_sk_filter_rcv(sk, skb, &xmitq);
|
|
added = sk_rmem_alloc_get(sk) - before;
|
|
atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
|
|
|
|
/* Send pending response/rejected messages, if any */
|
|
tipc_node_distr_xmit(sock_net(sk), &xmitq);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_sk_enqueue - extract all buffers with destination 'dport' from
|
|
* inputq and try adding them to socket or backlog queue
|
|
* @inputq: list of incoming buffers with potentially different destinations
|
|
* @sk: socket where the buffers should be enqueued
|
|
* @dport: port number for the socket
|
|
*
|
|
* Caller must hold socket lock
|
|
*/
|
|
static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
|
|
u32 dport, struct sk_buff_head *xmitq)
|
|
{
|
|
unsigned long time_limit = jiffies + 2;
|
|
struct sk_buff *skb;
|
|
unsigned int lim;
|
|
atomic_t *dcnt;
|
|
u32 onode;
|
|
|
|
while (skb_queue_len(inputq)) {
|
|
if (unlikely(time_after_eq(jiffies, time_limit)))
|
|
return;
|
|
|
|
skb = tipc_skb_dequeue(inputq, dport);
|
|
if (unlikely(!skb))
|
|
return;
|
|
|
|
/* Add message directly to receive queue if possible */
|
|
if (!sock_owned_by_user(sk)) {
|
|
tipc_sk_filter_rcv(sk, skb, xmitq);
|
|
continue;
|
|
}
|
|
|
|
/* Try backlog, compensating for double-counted bytes */
|
|
dcnt = &tipc_sk(sk)->dupl_rcvcnt;
|
|
if (!sk->sk_backlog.len)
|
|
atomic_set(dcnt, 0);
|
|
lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
|
|
if (likely(!sk_add_backlog(sk, skb, lim)))
|
|
continue;
|
|
|
|
/* Overload => reject message back to sender */
|
|
onode = tipc_own_addr(sock_net(sk));
|
|
if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD))
|
|
__skb_queue_tail(xmitq, skb);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tipc_sk_rcv - handle a chain of incoming buffers
|
|
* @inputq: buffer list containing the buffers
|
|
* Consumes all buffers in list until inputq is empty
|
|
* Note: may be called in multiple threads referring to the same queue
|
|
*/
|
|
void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
|
|
{
|
|
struct sk_buff_head xmitq;
|
|
u32 dnode, dport = 0;
|
|
int err;
|
|
struct tipc_sock *tsk;
|
|
struct sock *sk;
|
|
struct sk_buff *skb;
|
|
|
|
__skb_queue_head_init(&xmitq);
|
|
while (skb_queue_len(inputq)) {
|
|
dport = tipc_skb_peek_port(inputq, dport);
|
|
tsk = tipc_sk_lookup(net, dport);
|
|
|
|
if (likely(tsk)) {
|
|
sk = &tsk->sk;
|
|
if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
|
|
tipc_sk_enqueue(inputq, sk, dport, &xmitq);
|
|
spin_unlock_bh(&sk->sk_lock.slock);
|
|
}
|
|
/* Send pending response/rejected messages, if any */
|
|
tipc_node_distr_xmit(sock_net(sk), &xmitq);
|
|
sock_put(sk);
|
|
continue;
|
|
}
|
|
/* No destination socket => dequeue skb if still there */
|
|
skb = tipc_skb_dequeue(inputq, dport);
|
|
if (!skb)
|
|
return;
|
|
|
|
/* Try secondary lookup if unresolved named message */
|
|
err = TIPC_ERR_NO_PORT;
|
|
if (tipc_msg_lookup_dest(net, skb, &err))
|
|
goto xmit;
|
|
|
|
/* Prepare for message rejection */
|
|
if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
|
|
continue;
|
|
xmit:
|
|
dnode = msg_destnode(buf_msg(skb));
|
|
tipc_node_xmit_skb(net, skb, dnode, dport);
|
|
}
|
|
}
|
|
|
|
static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
|
|
{
|
|
DEFINE_WAIT_FUNC(wait, woken_wake_function);
|
|
struct sock *sk = sock->sk;
|
|
int done;
|
|
|
|
do {
|
|
int err = sock_error(sk);
|
|
if (err)
|
|
return err;
|
|
if (!*timeo_p)
|
|
return -ETIMEDOUT;
|
|
if (signal_pending(current))
|
|
return sock_intr_errno(*timeo_p);
|
|
|
|
add_wait_queue(sk_sleep(sk), &wait);
|
|
done = sk_wait_event(sk, timeo_p,
|
|
sk->sk_state != TIPC_CONNECTING, &wait);
|
|
remove_wait_queue(sk_sleep(sk), &wait);
|
|
} while (!done);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_connect - establish a connection to another TIPC port
|
|
* @sock: socket structure
|
|
* @dest: socket address for destination port
|
|
* @destlen: size of socket address data structure
|
|
* @flags: file-related flags associated with socket
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
static int tipc_connect(struct socket *sock, struct sockaddr *dest,
|
|
int destlen, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
|
|
struct msghdr m = {NULL,};
|
|
long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
|
|
int previous;
|
|
int res = 0;
|
|
|
|
if (destlen != sizeof(struct sockaddr_tipc))
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (tsk->group) {
|
|
res = -EINVAL;
|
|
goto exit;
|
|
}
|
|
|
|
if (dst->family == AF_UNSPEC) {
|
|
memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
|
|
if (!tipc_sk_type_connectionless(sk))
|
|
res = -EINVAL;
|
|
goto exit;
|
|
} else if (dst->family != AF_TIPC) {
|
|
res = -EINVAL;
|
|
}
|
|
if (dst->addrtype != TIPC_ADDR_ID && dst->addrtype != TIPC_ADDR_NAME)
|
|
res = -EINVAL;
|
|
if (res)
|
|
goto exit;
|
|
|
|
/* DGRAM/RDM connect(), just save the destaddr */
|
|
if (tipc_sk_type_connectionless(sk)) {
|
|
memcpy(&tsk->peer, dest, destlen);
|
|
goto exit;
|
|
}
|
|
|
|
previous = sk->sk_state;
|
|
|
|
switch (sk->sk_state) {
|
|
case TIPC_OPEN:
|
|
/* Send a 'SYN-' to destination */
|
|
m.msg_name = dest;
|
|
m.msg_namelen = destlen;
|
|
|
|
/* If connect is in non-blocking case, set MSG_DONTWAIT to
|
|
* indicate send_msg() is never blocked.
|
|
*/
|
|
if (!timeout)
|
|
m.msg_flags = MSG_DONTWAIT;
|
|
|
|
res = __tipc_sendmsg(sock, &m, 0);
|
|
if ((res < 0) && (res != -EWOULDBLOCK))
|
|
goto exit;
|
|
|
|
/* Just entered TIPC_CONNECTING state; the only
|
|
* difference is that return value in non-blocking
|
|
* case is EINPROGRESS, rather than EALREADY.
|
|
*/
|
|
res = -EINPROGRESS;
|
|
/* fall thru' */
|
|
case TIPC_CONNECTING:
|
|
if (!timeout) {
|
|
if (previous == TIPC_CONNECTING)
|
|
res = -EALREADY;
|
|
goto exit;
|
|
}
|
|
timeout = msecs_to_jiffies(timeout);
|
|
/* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
|
|
res = tipc_wait_for_connect(sock, &timeout);
|
|
break;
|
|
case TIPC_ESTABLISHED:
|
|
res = -EISCONN;
|
|
break;
|
|
default:
|
|
res = -EINVAL;
|
|
}
|
|
|
|
exit:
|
|
release_sock(sk);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tipc_listen - allow socket to listen for incoming connections
|
|
* @sock: socket structure
|
|
* @len: (unused)
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
static int tipc_listen(struct socket *sock, int len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int res;
|
|
|
|
lock_sock(sk);
|
|
res = tipc_set_sk_state(sk, TIPC_LISTEN);
|
|
release_sock(sk);
|
|
|
|
return res;
|
|
}
|
|
|
|
static int tipc_wait_for_accept(struct socket *sock, long timeo)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
DEFINE_WAIT(wait);
|
|
int err;
|
|
|
|
/* True wake-one mechanism for incoming connections: only
|
|
* one process gets woken up, not the 'whole herd'.
|
|
* Since we do not 'race & poll' for established sockets
|
|
* anymore, the common case will execute the loop only once.
|
|
*/
|
|
for (;;) {
|
|
prepare_to_wait_exclusive(sk_sleep(sk), &wait,
|
|
TASK_INTERRUPTIBLE);
|
|
if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
|
|
release_sock(sk);
|
|
timeo = schedule_timeout(timeo);
|
|
lock_sock(sk);
|
|
}
|
|
err = 0;
|
|
if (!skb_queue_empty(&sk->sk_receive_queue))
|
|
break;
|
|
err = -EAGAIN;
|
|
if (!timeo)
|
|
break;
|
|
err = sock_intr_errno(timeo);
|
|
if (signal_pending(current))
|
|
break;
|
|
}
|
|
finish_wait(sk_sleep(sk), &wait);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* tipc_accept - wait for connection request
|
|
* @sock: listening socket
|
|
* @newsock: new socket that is to be connected
|
|
* @flags: file-related flags associated with socket
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
|
|
bool kern)
|
|
{
|
|
struct sock *new_sk, *sk = sock->sk;
|
|
struct sk_buff *buf;
|
|
struct tipc_sock *new_tsock;
|
|
struct tipc_msg *msg;
|
|
long timeo;
|
|
int res;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_state != TIPC_LISTEN) {
|
|
res = -EINVAL;
|
|
goto exit;
|
|
}
|
|
timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
|
|
res = tipc_wait_for_accept(sock, timeo);
|
|
if (res)
|
|
goto exit;
|
|
|
|
buf = skb_peek(&sk->sk_receive_queue);
|
|
|
|
res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern);
|
|
if (res)
|
|
goto exit;
|
|
security_sk_clone(sock->sk, new_sock->sk);
|
|
|
|
new_sk = new_sock->sk;
|
|
new_tsock = tipc_sk(new_sk);
|
|
msg = buf_msg(buf);
|
|
|
|
/* we lock on new_sk; but lockdep sees the lock on sk */
|
|
lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
|
|
|
|
/*
|
|
* Reject any stray messages received by new socket
|
|
* before the socket lock was taken (very, very unlikely)
|
|
*/
|
|
tsk_rej_rx_queue(new_sk);
|
|
|
|
/* Connect new socket to it's peer */
|
|
tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
|
|
|
|
tsk_set_importance(new_tsock, msg_importance(msg));
|
|
if (msg_named(msg)) {
|
|
new_tsock->conn_type = msg_nametype(msg);
|
|
new_tsock->conn_instance = msg_nameinst(msg);
|
|
}
|
|
|
|
/*
|
|
* Respond to 'SYN-' by discarding it & returning 'ACK'-.
|
|
* Respond to 'SYN+' by queuing it on new socket.
|
|
*/
|
|
if (!msg_data_sz(msg)) {
|
|
struct msghdr m = {NULL,};
|
|
|
|
tsk_advance_rx_queue(sk);
|
|
__tipc_sendstream(new_sock, &m, 0);
|
|
} else {
|
|
__skb_dequeue(&sk->sk_receive_queue);
|
|
__skb_queue_head(&new_sk->sk_receive_queue, buf);
|
|
skb_set_owner_r(buf, new_sk);
|
|
}
|
|
release_sock(new_sk);
|
|
exit:
|
|
release_sock(sk);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tipc_shutdown - shutdown socket connection
|
|
* @sock: socket structure
|
|
* @how: direction to close (must be SHUT_RDWR)
|
|
*
|
|
* Terminates connection (if necessary), then purges socket's receive queue.
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
static int tipc_shutdown(struct socket *sock, int how)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int res;
|
|
|
|
if (how != SHUT_RDWR)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
__tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
|
|
sk->sk_shutdown = SEND_SHUTDOWN;
|
|
|
|
if (sk->sk_state == TIPC_DISCONNECTING) {
|
|
/* Discard any unreceived messages */
|
|
__skb_queue_purge(&sk->sk_receive_queue);
|
|
|
|
/* Wake up anyone sleeping in poll */
|
|
sk->sk_state_change(sk);
|
|
res = 0;
|
|
} else {
|
|
res = -ENOTCONN;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return res;
|
|
}
|
|
|
|
static void tipc_sk_timeout(struct timer_list *t)
|
|
{
|
|
struct sock *sk = from_timer(sk, t, sk_timer);
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
u32 peer_port = tsk_peer_port(tsk);
|
|
u32 peer_node = tsk_peer_node(tsk);
|
|
u32 own_node = tsk_own_node(tsk);
|
|
u32 own_port = tsk->portid;
|
|
struct net *net = sock_net(sk);
|
|
struct sk_buff *skb = NULL;
|
|
|
|
bh_lock_sock(sk);
|
|
if (!tipc_sk_connected(sk))
|
|
goto exit;
|
|
|
|
/* Try again later if socket is busy */
|
|
if (sock_owned_by_user(sk)) {
|
|
sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
|
|
goto exit;
|
|
}
|
|
|
|
if (tsk->probe_unacked) {
|
|
tipc_set_sk_state(sk, TIPC_DISCONNECTING);
|
|
tipc_node_remove_conn(net, peer_node, peer_port);
|
|
sk->sk_state_change(sk);
|
|
goto exit;
|
|
}
|
|
/* Send new probe */
|
|
skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
|
|
peer_node, own_node, peer_port, own_port,
|
|
TIPC_OK);
|
|
tsk->probe_unacked = true;
|
|
sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
|
|
exit:
|
|
bh_unlock_sock(sk);
|
|
if (skb)
|
|
tipc_node_xmit_skb(net, skb, peer_node, own_port);
|
|
sock_put(sk);
|
|
}
|
|
|
|
static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
|
|
struct tipc_name_seq const *seq)
|
|
{
|
|
struct sock *sk = &tsk->sk;
|
|
struct net *net = sock_net(sk);
|
|
struct publication *publ;
|
|
u32 key;
|
|
|
|
if (tipc_sk_connected(sk))
|
|
return -EINVAL;
|
|
key = tsk->portid + tsk->pub_count + 1;
|
|
if (key == tsk->portid)
|
|
return -EADDRINUSE;
|
|
|
|
publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper,
|
|
scope, tsk->portid, key);
|
|
if (unlikely(!publ))
|
|
return -EINVAL;
|
|
|
|
list_add(&publ->pport_list, &tsk->publications);
|
|
tsk->pub_count++;
|
|
tsk->published = 1;
|
|
return 0;
|
|
}
|
|
|
|
static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
|
|
struct tipc_name_seq const *seq)
|
|
{
|
|
struct net *net = sock_net(&tsk->sk);
|
|
struct publication *publ;
|
|
struct publication *safe;
|
|
int rc = -EINVAL;
|
|
|
|
list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) {
|
|
if (seq) {
|
|
if (publ->scope != scope)
|
|
continue;
|
|
if (publ->type != seq->type)
|
|
continue;
|
|
if (publ->lower != seq->lower)
|
|
continue;
|
|
if (publ->upper != seq->upper)
|
|
break;
|
|
tipc_nametbl_withdraw(net, publ->type, publ->lower,
|
|
publ->ref, publ->key);
|
|
rc = 0;
|
|
break;
|
|
}
|
|
tipc_nametbl_withdraw(net, publ->type, publ->lower,
|
|
publ->ref, publ->key);
|
|
rc = 0;
|
|
}
|
|
if (list_empty(&tsk->publications))
|
|
tsk->published = 0;
|
|
return rc;
|
|
}
|
|
|
|
/* tipc_sk_reinit: set non-zero address in all existing sockets
|
|
* when we go from standalone to network mode.
|
|
*/
|
|
void tipc_sk_reinit(struct net *net)
|
|
{
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
struct rhashtable_iter iter;
|
|
struct tipc_sock *tsk;
|
|
struct tipc_msg *msg;
|
|
|
|
rhashtable_walk_enter(&tn->sk_rht, &iter);
|
|
|
|
do {
|
|
rhashtable_walk_start(&iter);
|
|
|
|
while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
|
|
spin_lock_bh(&tsk->sk.sk_lock.slock);
|
|
msg = &tsk->phdr;
|
|
msg_set_prevnode(msg, tn->own_addr);
|
|
msg_set_orignode(msg, tn->own_addr);
|
|
spin_unlock_bh(&tsk->sk.sk_lock.slock);
|
|
}
|
|
|
|
rhashtable_walk_stop(&iter);
|
|
} while (tsk == ERR_PTR(-EAGAIN));
|
|
}
|
|
|
|
static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
|
|
{
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
struct tipc_sock *tsk;
|
|
|
|
rcu_read_lock();
|
|
tsk = rhashtable_lookup_fast(&tn->sk_rht, &portid, tsk_rht_params);
|
|
if (tsk)
|
|
sock_hold(&tsk->sk);
|
|
rcu_read_unlock();
|
|
|
|
return tsk;
|
|
}
|
|
|
|
static int tipc_sk_insert(struct tipc_sock *tsk)
|
|
{
|
|
struct sock *sk = &tsk->sk;
|
|
struct net *net = sock_net(sk);
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
|
|
u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
|
|
|
|
while (remaining--) {
|
|
portid++;
|
|
if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
|
|
portid = TIPC_MIN_PORT;
|
|
tsk->portid = portid;
|
|
sock_hold(&tsk->sk);
|
|
if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
|
|
tsk_rht_params))
|
|
return 0;
|
|
sock_put(&tsk->sk);
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static void tipc_sk_remove(struct tipc_sock *tsk)
|
|
{
|
|
struct sock *sk = &tsk->sk;
|
|
struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
|
|
|
|
if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
|
|
WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
|
|
__sock_put(sk);
|
|
}
|
|
}
|
|
|
|
static const struct rhashtable_params tsk_rht_params = {
|
|
.nelem_hint = 192,
|
|
.head_offset = offsetof(struct tipc_sock, node),
|
|
.key_offset = offsetof(struct tipc_sock, portid),
|
|
.key_len = sizeof(u32), /* portid */
|
|
.max_size = 1048576,
|
|
.min_size = 256,
|
|
.automatic_shrinking = true,
|
|
};
|
|
|
|
int tipc_sk_rht_init(struct net *net)
|
|
{
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
|
|
return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
|
|
}
|
|
|
|
void tipc_sk_rht_destroy(struct net *net)
|
|
{
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
|
|
/* Wait for socket readers to complete */
|
|
synchronize_net();
|
|
|
|
rhashtable_destroy(&tn->sk_rht);
|
|
}
|
|
|
|
static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
|
|
{
|
|
struct net *net = sock_net(&tsk->sk);
|
|
struct tipc_group *grp = tsk->group;
|
|
struct tipc_msg *hdr = &tsk->phdr;
|
|
struct tipc_name_seq seq;
|
|
int rc;
|
|
|
|
if (mreq->type < TIPC_RESERVED_TYPES)
|
|
return -EACCES;
|
|
if (mreq->scope > TIPC_NODE_SCOPE)
|
|
return -EINVAL;
|
|
if (grp)
|
|
return -EACCES;
|
|
grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
|
|
if (!grp)
|
|
return -ENOMEM;
|
|
tsk->group = grp;
|
|
msg_set_lookup_scope(hdr, mreq->scope);
|
|
msg_set_nametype(hdr, mreq->type);
|
|
msg_set_dest_droppable(hdr, true);
|
|
seq.type = mreq->type;
|
|
seq.lower = mreq->instance;
|
|
seq.upper = seq.lower;
|
|
tipc_nametbl_build_group(net, grp, mreq->type, mreq->scope);
|
|
rc = tipc_sk_publish(tsk, mreq->scope, &seq);
|
|
if (rc) {
|
|
tipc_group_delete(net, grp);
|
|
tsk->group = NULL;
|
|
return rc;
|
|
}
|
|
/* Eliminate any risk that a broadcast overtakes sent JOINs */
|
|
tsk->mc_method.rcast = true;
|
|
tsk->mc_method.mandatory = true;
|
|
tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
|
|
return rc;
|
|
}
|
|
|
|
static int tipc_sk_leave(struct tipc_sock *tsk)
|
|
{
|
|
struct net *net = sock_net(&tsk->sk);
|
|
struct tipc_group *grp = tsk->group;
|
|
struct tipc_name_seq seq;
|
|
int scope;
|
|
|
|
if (!grp)
|
|
return -EINVAL;
|
|
tipc_group_self(grp, &seq, &scope);
|
|
tipc_group_delete(net, grp);
|
|
tsk->group = NULL;
|
|
tipc_sk_withdraw(tsk, scope, &seq);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_setsockopt - set socket option
|
|
* @sock: socket structure
|
|
* @lvl: option level
|
|
* @opt: option identifier
|
|
* @ov: pointer to new option value
|
|
* @ol: length of option value
|
|
*
|
|
* For stream sockets only, accepts and ignores all IPPROTO_TCP options
|
|
* (to ease compatibility).
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
|
|
char __user *ov, unsigned int ol)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_group_req mreq;
|
|
u32 value = 0;
|
|
int res = 0;
|
|
|
|
if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
|
|
return 0;
|
|
if (lvl != SOL_TIPC)
|
|
return -ENOPROTOOPT;
|
|
|
|
switch (opt) {
|
|
case TIPC_IMPORTANCE:
|
|
case TIPC_SRC_DROPPABLE:
|
|
case TIPC_DEST_DROPPABLE:
|
|
case TIPC_CONN_TIMEOUT:
|
|
if (ol < sizeof(value))
|
|
return -EINVAL;
|
|
if (get_user(value, (u32 __user *)ov))
|
|
return -EFAULT;
|
|
break;
|
|
case TIPC_GROUP_JOIN:
|
|
if (ol < sizeof(mreq))
|
|
return -EINVAL;
|
|
if (copy_from_user(&mreq, ov, sizeof(mreq)))
|
|
return -EFAULT;
|
|
break;
|
|
default:
|
|
if (ov || ol)
|
|
return -EINVAL;
|
|
}
|
|
|
|
lock_sock(sk);
|
|
|
|
switch (opt) {
|
|
case TIPC_IMPORTANCE:
|
|
res = tsk_set_importance(tsk, value);
|
|
break;
|
|
case TIPC_SRC_DROPPABLE:
|
|
if (sock->type != SOCK_STREAM)
|
|
tsk_set_unreliable(tsk, value);
|
|
else
|
|
res = -ENOPROTOOPT;
|
|
break;
|
|
case TIPC_DEST_DROPPABLE:
|
|
tsk_set_unreturnable(tsk, value);
|
|
break;
|
|
case TIPC_CONN_TIMEOUT:
|
|
tipc_sk(sk)->conn_timeout = value;
|
|
break;
|
|
case TIPC_MCAST_BROADCAST:
|
|
tsk->mc_method.rcast = false;
|
|
tsk->mc_method.mandatory = true;
|
|
break;
|
|
case TIPC_MCAST_REPLICAST:
|
|
tsk->mc_method.rcast = true;
|
|
tsk->mc_method.mandatory = true;
|
|
break;
|
|
case TIPC_GROUP_JOIN:
|
|
res = tipc_sk_join(tsk, &mreq);
|
|
break;
|
|
case TIPC_GROUP_LEAVE:
|
|
res = tipc_sk_leave(tsk);
|
|
break;
|
|
default:
|
|
res = -EINVAL;
|
|
}
|
|
|
|
release_sock(sk);
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tipc_getsockopt - get socket option
|
|
* @sock: socket structure
|
|
* @lvl: option level
|
|
* @opt: option identifier
|
|
* @ov: receptacle for option value
|
|
* @ol: receptacle for length of option value
|
|
*
|
|
* For stream sockets only, returns 0 length result for all IPPROTO_TCP options
|
|
* (to ease compatibility).
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
|
|
char __user *ov, int __user *ol)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_name_seq seq;
|
|
int len, scope;
|
|
u32 value;
|
|
int res;
|
|
|
|
if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
|
|
return put_user(0, ol);
|
|
if (lvl != SOL_TIPC)
|
|
return -ENOPROTOOPT;
|
|
res = get_user(len, ol);
|
|
if (res)
|
|
return res;
|
|
|
|
lock_sock(sk);
|
|
|
|
switch (opt) {
|
|
case TIPC_IMPORTANCE:
|
|
value = tsk_importance(tsk);
|
|
break;
|
|
case TIPC_SRC_DROPPABLE:
|
|
value = tsk_unreliable(tsk);
|
|
break;
|
|
case TIPC_DEST_DROPPABLE:
|
|
value = tsk_unreturnable(tsk);
|
|
break;
|
|
case TIPC_CONN_TIMEOUT:
|
|
value = tsk->conn_timeout;
|
|
/* no need to set "res", since already 0 at this point */
|
|
break;
|
|
case TIPC_NODE_RECVQ_DEPTH:
|
|
value = 0; /* was tipc_queue_size, now obsolete */
|
|
break;
|
|
case TIPC_SOCK_RECVQ_DEPTH:
|
|
value = skb_queue_len(&sk->sk_receive_queue);
|
|
break;
|
|
case TIPC_GROUP_JOIN:
|
|
seq.type = 0;
|
|
if (tsk->group)
|
|
tipc_group_self(tsk->group, &seq, &scope);
|
|
value = seq.type;
|
|
break;
|
|
default:
|
|
res = -EINVAL;
|
|
}
|
|
|
|
release_sock(sk);
|
|
|
|
if (res)
|
|
return res; /* "get" failed */
|
|
|
|
if (len < sizeof(value))
|
|
return -EINVAL;
|
|
|
|
if (copy_to_user(ov, &value, sizeof(value)))
|
|
return -EFAULT;
|
|
|
|
return put_user(sizeof(value), ol);
|
|
}
|
|
|
|
static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sioc_ln_req lnr;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
switch (cmd) {
|
|
case SIOCGETLINKNAME:
|
|
if (copy_from_user(&lnr, argp, sizeof(lnr)))
|
|
return -EFAULT;
|
|
if (!tipc_node_get_linkname(sock_net(sk),
|
|
lnr.bearer_id & 0xffff, lnr.peer,
|
|
lnr.linkname, TIPC_MAX_LINK_NAME)) {
|
|
if (copy_to_user(argp, &lnr, sizeof(lnr)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
return -EADDRNOTAVAIL;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
|
|
{
|
|
struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
|
|
struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
|
|
u32 onode = tipc_own_addr(sock_net(sock1->sk));
|
|
|
|
tsk1->peer.family = AF_TIPC;
|
|
tsk1->peer.addrtype = TIPC_ADDR_ID;
|
|
tsk1->peer.scope = TIPC_NODE_SCOPE;
|
|
tsk1->peer.addr.id.ref = tsk2->portid;
|
|
tsk1->peer.addr.id.node = onode;
|
|
tsk2->peer.family = AF_TIPC;
|
|
tsk2->peer.addrtype = TIPC_ADDR_ID;
|
|
tsk2->peer.scope = TIPC_NODE_SCOPE;
|
|
tsk2->peer.addr.id.ref = tsk1->portid;
|
|
tsk2->peer.addr.id.node = onode;
|
|
|
|
tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
|
|
tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
|
|
return 0;
|
|
}
|
|
|
|
/* Protocol switches for the various types of TIPC sockets */
|
|
|
|
static const struct proto_ops msg_ops = {
|
|
.owner = THIS_MODULE,
|
|
.family = AF_TIPC,
|
|
.release = tipc_release,
|
|
.bind = tipc_bind,
|
|
.connect = tipc_connect,
|
|
.socketpair = tipc_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = tipc_getname,
|
|
.poll = tipc_poll,
|
|
.ioctl = tipc_ioctl,
|
|
.listen = sock_no_listen,
|
|
.shutdown = tipc_shutdown,
|
|
.setsockopt = tipc_setsockopt,
|
|
.getsockopt = tipc_getsockopt,
|
|
.sendmsg = tipc_sendmsg,
|
|
.recvmsg = tipc_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage
|
|
};
|
|
|
|
static const struct proto_ops packet_ops = {
|
|
.owner = THIS_MODULE,
|
|
.family = AF_TIPC,
|
|
.release = tipc_release,
|
|
.bind = tipc_bind,
|
|
.connect = tipc_connect,
|
|
.socketpair = tipc_socketpair,
|
|
.accept = tipc_accept,
|
|
.getname = tipc_getname,
|
|
.poll = tipc_poll,
|
|
.ioctl = tipc_ioctl,
|
|
.listen = tipc_listen,
|
|
.shutdown = tipc_shutdown,
|
|
.setsockopt = tipc_setsockopt,
|
|
.getsockopt = tipc_getsockopt,
|
|
.sendmsg = tipc_send_packet,
|
|
.recvmsg = tipc_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage
|
|
};
|
|
|
|
static const struct proto_ops stream_ops = {
|
|
.owner = THIS_MODULE,
|
|
.family = AF_TIPC,
|
|
.release = tipc_release,
|
|
.bind = tipc_bind,
|
|
.connect = tipc_connect,
|
|
.socketpair = tipc_socketpair,
|
|
.accept = tipc_accept,
|
|
.getname = tipc_getname,
|
|
.poll = tipc_poll,
|
|
.ioctl = tipc_ioctl,
|
|
.listen = tipc_listen,
|
|
.shutdown = tipc_shutdown,
|
|
.setsockopt = tipc_setsockopt,
|
|
.getsockopt = tipc_getsockopt,
|
|
.sendmsg = tipc_sendstream,
|
|
.recvmsg = tipc_recvstream,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage
|
|
};
|
|
|
|
static const struct net_proto_family tipc_family_ops = {
|
|
.owner = THIS_MODULE,
|
|
.family = AF_TIPC,
|
|
.create = tipc_sk_create
|
|
};
|
|
|
|
static struct proto tipc_proto = {
|
|
.name = "TIPC",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct tipc_sock),
|
|
.sysctl_rmem = sysctl_tipc_rmem
|
|
};
|
|
|
|
/**
|
|
* tipc_socket_init - initialize TIPC socket interface
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
int tipc_socket_init(void)
|
|
{
|
|
int res;
|
|
|
|
res = proto_register(&tipc_proto, 1);
|
|
if (res) {
|
|
pr_err("Failed to register TIPC protocol type\n");
|
|
goto out;
|
|
}
|
|
|
|
res = sock_register(&tipc_family_ops);
|
|
if (res) {
|
|
pr_err("Failed to register TIPC socket type\n");
|
|
proto_unregister(&tipc_proto);
|
|
goto out;
|
|
}
|
|
out:
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tipc_socket_stop - stop TIPC socket interface
|
|
*/
|
|
void tipc_socket_stop(void)
|
|
{
|
|
sock_unregister(tipc_family_ops.family);
|
|
proto_unregister(&tipc_proto);
|
|
}
|
|
|
|
/* Caller should hold socket lock for the passed tipc socket. */
|
|
static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
|
|
{
|
|
u32 peer_node;
|
|
u32 peer_port;
|
|
struct nlattr *nest;
|
|
|
|
peer_node = tsk_peer_node(tsk);
|
|
peer_port = tsk_peer_port(tsk);
|
|
|
|
nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
|
|
|
|
if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
|
|
goto msg_full;
|
|
if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
|
|
goto msg_full;
|
|
|
|
if (tsk->conn_type != 0) {
|
|
if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
|
|
goto msg_full;
|
|
if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
|
|
goto msg_full;
|
|
if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
|
|
goto msg_full;
|
|
}
|
|
nla_nest_end(skb, nest);
|
|
|
|
return 0;
|
|
|
|
msg_full:
|
|
nla_nest_cancel(skb, nest);
|
|
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
/* Caller should hold socket lock for the passed tipc socket. */
|
|
static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
|
|
struct tipc_sock *tsk)
|
|
{
|
|
int err;
|
|
void *hdr;
|
|
struct nlattr *attrs;
|
|
struct net *net = sock_net(skb->sk);
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
struct sock *sk = &tsk->sk;
|
|
|
|
hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
|
|
&tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
|
|
if (!hdr)
|
|
goto msg_cancel;
|
|
|
|
attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
|
|
if (!attrs)
|
|
goto genlmsg_cancel;
|
|
if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid))
|
|
goto attr_msg_cancel;
|
|
if (nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tn->own_addr))
|
|
goto attr_msg_cancel;
|
|
|
|
if (tipc_sk_connected(sk)) {
|
|
err = __tipc_nl_add_sk_con(skb, tsk);
|
|
if (err)
|
|
goto attr_msg_cancel;
|
|
} else if (!list_empty(&tsk->publications)) {
|
|
if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
|
|
goto attr_msg_cancel;
|
|
}
|
|
nla_nest_end(skb, attrs);
|
|
genlmsg_end(skb, hdr);
|
|
|
|
return 0;
|
|
|
|
attr_msg_cancel:
|
|
nla_nest_cancel(skb, attrs);
|
|
genlmsg_cancel:
|
|
genlmsg_cancel(skb, hdr);
|
|
msg_cancel:
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int err;
|
|
struct tipc_sock *tsk;
|
|
const struct bucket_table *tbl;
|
|
struct rhash_head *pos;
|
|
struct net *net = sock_net(skb->sk);
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
u32 tbl_id = cb->args[0];
|
|
u32 prev_portid = cb->args[1];
|
|
|
|
rcu_read_lock();
|
|
tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht);
|
|
for (; tbl_id < tbl->size; tbl_id++) {
|
|
rht_for_each_entry_rcu(tsk, pos, tbl, tbl_id, node) {
|
|
spin_lock_bh(&tsk->sk.sk_lock.slock);
|
|
if (prev_portid && prev_portid != tsk->portid) {
|
|
spin_unlock_bh(&tsk->sk.sk_lock.slock);
|
|
continue;
|
|
}
|
|
|
|
err = __tipc_nl_add_sk(skb, cb, tsk);
|
|
if (err) {
|
|
prev_portid = tsk->portid;
|
|
spin_unlock_bh(&tsk->sk.sk_lock.slock);
|
|
goto out;
|
|
}
|
|
prev_portid = 0;
|
|
spin_unlock_bh(&tsk->sk.sk_lock.slock);
|
|
}
|
|
}
|
|
out:
|
|
rcu_read_unlock();
|
|
cb->args[0] = tbl_id;
|
|
cb->args[1] = prev_portid;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
/* Caller should hold socket lock for the passed tipc socket. */
|
|
static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
|
|
struct netlink_callback *cb,
|
|
struct publication *publ)
|
|
{
|
|
void *hdr;
|
|
struct nlattr *attrs;
|
|
|
|
hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
|
|
&tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
|
|
if (!hdr)
|
|
goto msg_cancel;
|
|
|
|
attrs = nla_nest_start(skb, TIPC_NLA_PUBL);
|
|
if (!attrs)
|
|
goto genlmsg_cancel;
|
|
|
|
if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
|
|
goto attr_msg_cancel;
|
|
if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
|
|
goto attr_msg_cancel;
|
|
if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
|
|
goto attr_msg_cancel;
|
|
if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
|
|
goto attr_msg_cancel;
|
|
|
|
nla_nest_end(skb, attrs);
|
|
genlmsg_end(skb, hdr);
|
|
|
|
return 0;
|
|
|
|
attr_msg_cancel:
|
|
nla_nest_cancel(skb, attrs);
|
|
genlmsg_cancel:
|
|
genlmsg_cancel(skb, hdr);
|
|
msg_cancel:
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
/* Caller should hold socket lock for the passed tipc socket. */
|
|
static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
|
|
struct netlink_callback *cb,
|
|
struct tipc_sock *tsk, u32 *last_publ)
|
|
{
|
|
int err;
|
|
struct publication *p;
|
|
|
|
if (*last_publ) {
|
|
list_for_each_entry(p, &tsk->publications, pport_list) {
|
|
if (p->key == *last_publ)
|
|
break;
|
|
}
|
|
if (p->key != *last_publ) {
|
|
/* We never set seq or call nl_dump_check_consistent()
|
|
* this means that setting prev_seq here will cause the
|
|
* consistence check to fail in the netlink callback
|
|
* handler. Resulting in the last NLMSG_DONE message
|
|
* having the NLM_F_DUMP_INTR flag set.
|
|
*/
|
|
cb->prev_seq = 1;
|
|
*last_publ = 0;
|
|
return -EPIPE;
|
|
}
|
|
} else {
|
|
p = list_first_entry(&tsk->publications, struct publication,
|
|
pport_list);
|
|
}
|
|
|
|
list_for_each_entry_from(p, &tsk->publications, pport_list) {
|
|
err = __tipc_nl_add_sk_publ(skb, cb, p);
|
|
if (err) {
|
|
*last_publ = p->key;
|
|
return err;
|
|
}
|
|
}
|
|
*last_publ = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int err;
|
|
u32 tsk_portid = cb->args[0];
|
|
u32 last_publ = cb->args[1];
|
|
u32 done = cb->args[2];
|
|
struct net *net = sock_net(skb->sk);
|
|
struct tipc_sock *tsk;
|
|
|
|
if (!tsk_portid) {
|
|
struct nlattr **attrs;
|
|
struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
|
|
|
|
err = tipc_nlmsg_parse(cb->nlh, &attrs);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!attrs[TIPC_NLA_SOCK])
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX,
|
|
attrs[TIPC_NLA_SOCK],
|
|
tipc_nl_sock_policy, NULL);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!sock[TIPC_NLA_SOCK_REF])
|
|
return -EINVAL;
|
|
|
|
tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
|
|
}
|
|
|
|
if (done)
|
|
return 0;
|
|
|
|
tsk = tipc_sk_lookup(net, tsk_portid);
|
|
if (!tsk)
|
|
return -EINVAL;
|
|
|
|
lock_sock(&tsk->sk);
|
|
err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
|
|
if (!err)
|
|
done = 1;
|
|
release_sock(&tsk->sk);
|
|
sock_put(&tsk->sk);
|
|
|
|
cb->args[0] = tsk_portid;
|
|
cb->args[1] = last_publ;
|
|
cb->args[2] = done;
|
|
|
|
return skb->len;
|
|
}
|