/net/tipc/socket.c
C | 3359 lines | 2373 code | 409 blank | 577 comment | 495 complexity | a0b933d91793237934454f97aea48547 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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- /*
- * net/tipc/socket.c: TIPC socket API
- *
- * Copyright (c) 2001-2007, 2012-2017, Ericsson AB
- * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the names of the copyright holders nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * Alternatively, this software may be distributed under the terms of the
- * GNU General Public License ("GPL") version 2 as published by the Free
- * Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
- #include <linux/rhashtable.h>
- #include <linux/sched/signal.h>
- #include "core.h"
- #include "name_table.h"
- #include "node.h"
- #include "link.h"
- #include "name_distr.h"
- #include "socket.h"
- #include "bcast.h"
- #include "netlink.h"
- #include "group.h"
- #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
- #define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */
- #define TIPC_FWD_MSG 1
- #define TIPC_MAX_PORT 0xffffffff
- #define TIPC_MIN_PORT 1
- #define TIPC_ACK_RATE 4 /* ACK at 1/4 of of rcv window size */
- enum {
- TIPC_LISTEN = TCP_LISTEN,
- TIPC_ESTABLISHED = TCP_ESTABLISHED,
- TIPC_OPEN = TCP_CLOSE,
- TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
- TIPC_CONNECTING = TCP_SYN_SENT,
- };
- struct sockaddr_pair {
- struct sockaddr_tipc sock;
- struct sockaddr_tipc member;
- };
- /**
- * struct tipc_sock - TIPC socket structure
- * @sk: socket - interacts with 'port' and with user via the socket API
- * @conn_type: TIPC type used when connection was established
- * @conn_instance: TIPC instance used when connection was established
- * @published: non-zero if port has one or more associated names
- * @max_pkt: maximum packet size "hint" used when building messages sent by port
- * @portid: unique port identity in TIPC socket hash table
- * @phdr: preformatted message header used when sending messages
- * #cong_links: list of congested links
- * @publications: list of publications for port
- * @blocking_link: address of the congested link we are currently sleeping on
- * @pub_count: total # of publications port has made during its lifetime
- * @probing_state:
- * @conn_timeout: the time we can wait for an unresponded setup request
- * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
- * @cong_link_cnt: number of congested links
- * @snt_unacked: # messages sent by socket, and not yet acked by peer
- * @rcv_unacked: # messages read by user, but not yet acked back to peer
- * @peer: 'connected' peer for dgram/rdm
- * @node: hash table node
- * @mc_method: cookie for use between socket and broadcast layer
- * @rcu: rcu struct for tipc_sock
- */
- struct tipc_sock {
- struct sock sk;
- u32 conn_type;
- u32 conn_instance;
- int published;
- u32 max_pkt;
- u32 portid;
- struct tipc_msg phdr;
- struct list_head cong_links;
- struct list_head publications;
- u32 pub_count;
- uint conn_timeout;
- atomic_t dupl_rcvcnt;
- bool probe_unacked;
- u16 cong_link_cnt;
- u16 snt_unacked;
- u16 snd_win;
- u16 peer_caps;
- u16 rcv_unacked;
- u16 rcv_win;
- struct sockaddr_tipc peer;
- struct rhash_head node;
- struct tipc_mc_method mc_method;
- struct rcu_head rcu;
- struct tipc_group *group;
- };
- static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
- static void tipc_data_ready(struct sock *sk);
- static void tipc_write_space(struct sock *sk);
- static void tipc_sock_destruct(struct sock *sk);
- static int tipc_release(struct socket *sock);
- static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
- bool kern);
- static void tipc_sk_timeout(struct timer_list *t);
- static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
- struct tipc_name_seq const *seq);
- static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
- struct tipc_name_seq const *seq);
- static int tipc_sk_leave(struct tipc_sock *tsk);
- static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
- static int tipc_sk_insert(struct tipc_sock *tsk);
- static void tipc_sk_remove(struct tipc_sock *tsk);
- static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
- static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
- static const struct proto_ops packet_ops;
- static const struct proto_ops stream_ops;
- static const struct proto_ops msg_ops;
- static struct proto tipc_proto;
- static const struct rhashtable_params tsk_rht_params;
- static u32 tsk_own_node(struct tipc_sock *tsk)
- {
- return msg_prevnode(&tsk->phdr);
- }
- static u32 tsk_peer_node(struct tipc_sock *tsk)
- {
- return msg_destnode(&tsk->phdr);
- }
- static u32 tsk_peer_port(struct tipc_sock *tsk)
- {
- return msg_destport(&tsk->phdr);
- }
- static bool tsk_unreliable(struct tipc_sock *tsk)
- {
- return msg_src_droppable(&tsk->phdr) != 0;
- }
- static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
- {
- msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
- }
- static bool tsk_unreturnable(struct tipc_sock *tsk)
- {
- return msg_dest_droppable(&tsk->phdr) != 0;
- }
- static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
- {
- msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
- }
- static int tsk_importance(struct tipc_sock *tsk)
- {
- return msg_importance(&tsk->phdr);
- }
- static int tsk_set_importance(struct tipc_sock *tsk, int imp)
- {
- if (imp > TIPC_CRITICAL_IMPORTANCE)
- return -EINVAL;
- msg_set_importance(&tsk->phdr, (u32)imp);
- return 0;
- }
- static struct tipc_sock *tipc_sk(const struct sock *sk)
- {
- return container_of(sk, struct tipc_sock, sk);
- }
- static bool tsk_conn_cong(struct tipc_sock *tsk)
- {
- return tsk->snt_unacked > tsk->snd_win;
- }
- static u16 tsk_blocks(int len)
- {
- return ((len / FLOWCTL_BLK_SZ) + 1);
- }
- /* tsk_blocks(): translate a buffer size in bytes to number of
- * advertisable blocks, taking into account the ratio truesize(len)/len
- * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
- */
- static u16 tsk_adv_blocks(int len)
- {
- return len / FLOWCTL_BLK_SZ / 4;
- }
- /* tsk_inc(): increment counter for sent or received data
- * - If block based flow control is not supported by peer we
- * fall back to message based ditto, incrementing the counter
- */
- static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
- {
- if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
- return ((msglen / FLOWCTL_BLK_SZ) + 1);
- return 1;
- }
- /**
- * tsk_advance_rx_queue - discard first buffer in socket receive queue
- *
- * Caller must hold socket lock
- */
- static void tsk_advance_rx_queue(struct sock *sk)
- {
- kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
- }
- /* tipc_sk_respond() : send response message back to sender
- */
- static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
- {
- u32 selector;
- u32 dnode;
- u32 onode = tipc_own_addr(sock_net(sk));
- if (!tipc_msg_reverse(onode, &skb, err))
- return;
- dnode = msg_destnode(buf_msg(skb));
- selector = msg_origport(buf_msg(skb));
- tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
- }
- /**
- * tsk_rej_rx_queue - reject all buffers in socket receive queue
- *
- * Caller must hold socket lock
- */
- static void tsk_rej_rx_queue(struct sock *sk)
- {
- struct sk_buff *skb;
- while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
- tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT);
- }
- static bool tipc_sk_connected(struct sock *sk)
- {
- return sk->sk_state == TIPC_ESTABLISHED;
- }
- /* tipc_sk_type_connectionless - check if the socket is datagram socket
- * @sk: socket
- *
- * Returns true if connection less, false otherwise
- */
- static bool tipc_sk_type_connectionless(struct sock *sk)
- {
- return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
- }
- /* tsk_peer_msg - verify if message was sent by connected port's peer
- *
- * Handles cases where the node's network address has changed from
- * the default of <0.0.0> to its configured setting.
- */
- static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
- {
- struct sock *sk = &tsk->sk;
- struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
- u32 peer_port = tsk_peer_port(tsk);
- u32 orig_node;
- u32 peer_node;
- if (unlikely(!tipc_sk_connected(sk)))
- return false;
- if (unlikely(msg_origport(msg) != peer_port))
- return false;
- orig_node = msg_orignode(msg);
- peer_node = tsk_peer_node(tsk);
- if (likely(orig_node == peer_node))
- return true;
- if (!orig_node && (peer_node == tn->own_addr))
- return true;
- if (!peer_node && (orig_node == tn->own_addr))
- return true;
- return false;
- }
- /* tipc_set_sk_state - set the sk_state of the socket
- * @sk: socket
- *
- * Caller must hold socket lock
- *
- * Returns 0 on success, errno otherwise
- */
- static int tipc_set_sk_state(struct sock *sk, int state)
- {
- int oldsk_state = sk->sk_state;
- int res = -EINVAL;
- switch (state) {
- case TIPC_OPEN:
- res = 0;
- break;
- case TIPC_LISTEN:
- case TIPC_CONNECTING:
- if (oldsk_state == TIPC_OPEN)
- res = 0;
- break;
- case TIPC_ESTABLISHED:
- if (oldsk_state == TIPC_CONNECTING ||
- oldsk_state == TIPC_OPEN)
- res = 0;
- break;
- case TIPC_DISCONNECTING:
- if (oldsk_state == TIPC_CONNECTING ||
- oldsk_state == TIPC_ESTABLISHED)
- res = 0;
- break;
- }
- if (!res)
- sk->sk_state = state;
- return res;
- }
- static int tipc_sk_sock_err(struct socket *sock, long *timeout)
- {
- struct sock *sk = sock->sk;
- int err = sock_error(sk);
- int typ = sock->type;
- if (err)
- return err;
- if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
- if (sk->sk_state == TIPC_DISCONNECTING)
- return -EPIPE;
- else if (!tipc_sk_connected(sk))
- return -ENOTCONN;
- }
- if (!*timeout)
- return -EAGAIN;
- if (signal_pending(current))
- return sock_intr_errno(*timeout);
- return 0;
- }
- #define tipc_wait_for_cond(sock_, timeo_, condition_) \
- ({ \
- struct sock *sk_; \
- int rc_; \
- \
- while ((rc_ = !(condition_))) { \
- DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
- sk_ = (sock_)->sk; \
- rc_ = tipc_sk_sock_err((sock_), timeo_); \
- if (rc_) \
- break; \
- prepare_to_wait(sk_sleep(sk_), &wait_, TASK_INTERRUPTIBLE); \
- release_sock(sk_); \
- *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
- sched_annotate_sleep(); \
- lock_sock(sk_); \
- remove_wait_queue(sk_sleep(sk_), &wait_); \
- } \
- rc_; \
- })
- /**
- * tipc_sk_create - create a TIPC socket
- * @net: network namespace (must be default network)
- * @sock: pre-allocated socket structure
- * @protocol: protocol indicator (must be 0)
- * @kern: caused by kernel or by userspace?
- *
- * This routine creates additional data structures used by the TIPC socket,
- * initializes them, and links them together.
- *
- * Returns 0 on success, errno otherwise
- */
- static int tipc_sk_create(struct net *net, struct socket *sock,
- int protocol, int kern)
- {
- struct tipc_net *tn;
- const struct proto_ops *ops;
- struct sock *sk;
- struct tipc_sock *tsk;
- struct tipc_msg *msg;
- /* Validate arguments */
- if (unlikely(protocol != 0))
- return -EPROTONOSUPPORT;
- switch (sock->type) {
- case SOCK_STREAM:
- ops = &stream_ops;
- break;
- case SOCK_SEQPACKET:
- ops = &packet_ops;
- break;
- case SOCK_DGRAM:
- case SOCK_RDM:
- ops = &msg_ops;
- break;
- default:
- return -EPROTOTYPE;
- }
- /* Allocate socket's protocol area */
- sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
- if (sk == NULL)
- return -ENOMEM;
- tsk = tipc_sk(sk);
- tsk->max_pkt = MAX_PKT_DEFAULT;
- INIT_LIST_HEAD(&tsk->publications);
- INIT_LIST_HEAD(&tsk->cong_links);
- msg = &tsk->phdr;
- tn = net_generic(sock_net(sk), tipc_net_id);
- /* Finish initializing socket data structures */
- sock->ops = ops;
- sock_init_data(sock, sk);
- tipc_set_sk_state(sk, TIPC_OPEN);
- if (tipc_sk_insert(tsk)) {
- pr_warn("Socket create failed; port number exhausted\n");
- return -EINVAL;
- }
- /* Ensure tsk is visible before we read own_addr. */
- smp_mb();
- tipc_msg_init(tn->own_addr, msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG,
- NAMED_H_SIZE, 0);
- msg_set_origport(msg, tsk->portid);
- timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
- sk->sk_shutdown = 0;
- sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
- sk->sk_rcvbuf = sysctl_tipc_rmem[1];
- sk->sk_data_ready = tipc_data_ready;
- sk->sk_write_space = tipc_write_space;
- sk->sk_destruct = tipc_sock_destruct;
- tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
- atomic_set(&tsk->dupl_rcvcnt, 0);
- /* Start out with safe limits until we receive an advertised window */
- tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
- tsk->rcv_win = tsk->snd_win;
- if (tipc_sk_type_connectionless(sk)) {
- tsk_set_unreturnable(tsk, true);
- if (sock->type == SOCK_DGRAM)
- tsk_set_unreliable(tsk, true);
- }
- return 0;
- }
- static void tipc_sk_callback(struct rcu_head *head)
- {
- struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
- 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 unsigned int tipc_poll(struct file *file, struct socket *sock,
- poll_table *wait)
- {
- struct sock *sk = sock->sk;
- struct tipc_sock *tsk = tipc_sk(sk);
- struct tipc_group *grp = tsk->group;
- u32 revents = 0;
- sock_poll_wait(file, sk_sleep(sk), wait);
- if (sk->sk_shutdown & RCV_SHUTDOWN)
- revents |= POLLRDHUP | POLLIN | POLLRDNORM;
- if (sk->sk_shutdown == SHUTDOWN_MASK)
- revents |= POLLHUP;
- switch (sk->sk_state) {
- case TIPC_ESTABLISHED:
- if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
- revents |= POLLOUT;
- /* fall thru' */
- case TIPC_LISTEN:
- case TIPC_CONNECTING:
- if (!skb_queue_empty(&sk->sk_receive_queue))
- revents |= POLLIN | POLLRDNORM;
- break;
- case TIPC_OPEN:
- if (!grp || tipc_group_size(grp))
- if (!tsk->cong_link_cnt)
- revents |= POLLOUT;
- if (!tipc_sk_type_connectionless(sk))
- break;
- if (skb_queue_empty(&sk->sk_receive_queue))
- break;
- revents |= POLLIN | POLLRDNORM;
- break;
- case TIPC_DISCONNECTING:
- revents = POLLIN | POLLRDNORM | POLLHUP;
- 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;
- u32 domain = addr_domain(net, TIPC_CLUSTER_SCOPE);
- 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, domain, &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_member *first = NULL;
- struct tipc_member *mbr = NULL;
- struct net *net = sock_net(sk);
- u32 node, port, exclude;
- u32 type, inst, domain;
- struct list_head dsts;
- int lookups = 0;
- int dstcnt, rc;
- bool cong;
- INIT_LIST_HEAD(&dsts);
- type = dest->addr.name.name.type;
- inst = dest->addr.name.name.instance;
- domain = addr_domain(net, dest->scope);
- 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, domain, &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_name_seq *seq = &dest->addr.nameseq;
- struct tipc_sock *tsk = tipc_sk(sk);
- struct tipc_group *grp = tsk->group;
- struct net *net = sock_net(sk);
- u32 domain, exclude, dstcnt;
- struct list_head dsts;
- INIT_LIST_HEAD(&dsts);
- if (seq->lower != seq->upper)
- return -ENOTSUPP;
- domain = addr_domain(net, dest->scope);
- exclude = tipc_group_exclude(grp);
- if (!tipc_nametbl_lookup(net, seq->type, seq->lower, domain,
- &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 scope = TIPC_CLUSTER_SCOPE;
- u32 self = tipc_own_addr(net);
- struct sk_buff *skb, *_skb;
- u32 lower = 0, upper = ~0;
- struct sk_buff_head tmpq;
- u32 portid, oport, onode;
- struct list_head dports;
- struct tipc_msg *msg;
- int user, mtyp, hsz;
- __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)) {
- msg = buf_msg(skb);
- user = msg_user(msg);
- mtyp = msg_type(msg);
- 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);
- }
- refcount_dec(&skb->users);
- spin_unlock_bh(&inputq->lock);
- continue;
- }
- hsz = skb_headroom(skb) + msg_hdr_sz(msg);
- oport = msg_origport(msg);
- onode = msg_orignode(msg);
- if (onode == self)
- scope = TIPC_NODE_SCOPE;
- /* Create destination port list and message clones: */
- if (!msg_in_group(msg)) {
- lower = msg_namelower(msg);
- upper = msg_nameupper(msg);
- }
- tipc_nametbl_mc_translate(net, msg_nametype(msg), lower, upper,
- scope, &dports);
- while (tipc_dest_pop(&dports, NULL, &portid)) {
- _skb = __pskb_copy(skb, hsz, 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,
- siz…
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