/net/tipc/socket.c
C | 1900 lines | 1171 code | 219 blank | 510 comment | 282 complexity | 8789eb6f9de918a2dd8f70a8b3c8e0f9 MD5 | raw file
Possible License(s): AGPL-1.0, GPL-2.0, LGPL-2.0
- /*
- * net/tipc/socket.c: TIPC socket API
- *
- * Copyright (c) 2001-2007, 2012 Ericsson AB
- * Copyright (c) 2004-2008, 2010-2012, 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 "core.h"
- #include "port.h"
- #include <linux/export.h>
- #include <net/sock.h>
- #define SS_LISTENING -1 /* socket is listening */
- #define SS_READY -2 /* socket is connectionless */
- #define OVERLOAD_LIMIT_BASE 10000
- #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
- struct tipc_sock {
- struct sock sk;
- struct tipc_port *p;
- struct tipc_portid peer_name;
- unsigned int conn_timeout;
- };
- #define tipc_sk(sk) ((struct tipc_sock *)(sk))
- #define tipc_sk_port(sk) (tipc_sk(sk)->p)
- #define tipc_rx_ready(sock) (!skb_queue_empty(&sock->sk->sk_receive_queue) || \
- (sock->state == SS_DISCONNECTING))
- static int backlog_rcv(struct sock *sk, struct sk_buff *skb);
- static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);
- static void wakeupdispatch(struct tipc_port *tport);
- static void tipc_data_ready(struct sock *sk, int len);
- static void tipc_write_space(struct sock *sk);
- 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 int sockets_enabled;
- /*
- * Revised TIPC socket locking policy:
- *
- * Most socket operations take the standard socket lock when they start
- * and hold it until they finish (or until they need to sleep). Acquiring
- * this lock grants the owner exclusive access to the fields of the socket
- * data structures, with the exception of the backlog queue. A few socket
- * operations can be done without taking the socket lock because they only
- * read socket information that never changes during the life of the socket.
- *
- * Socket operations may acquire the lock for the associated TIPC port if they
- * need to perform an operation on the port. If any routine needs to acquire
- * both the socket lock and the port lock it must take the socket lock first
- * to avoid the risk of deadlock.
- *
- * The dispatcher handling incoming messages cannot grab the socket lock in
- * the standard fashion, since invoked it runs at the BH level and cannot block.
- * Instead, it checks to see if the socket lock is currently owned by someone,
- * and either handles the message itself or adds it to the socket's backlog
- * queue; in the latter case the queued message is processed once the process
- * owning the socket lock releases it.
- *
- * NOTE: Releasing the socket lock while an operation is sleeping overcomes
- * the problem of a blocked socket operation preventing any other operations
- * from occurring. However, applications must be careful if they have
- * multiple threads trying to send (or receive) on the same socket, as these
- * operations might interfere with each other. For example, doing a connect
- * and a receive at the same time might allow the receive to consume the
- * ACK message meant for the connect. While additional work could be done
- * to try and overcome this, it doesn't seem to be worthwhile at the present.
- *
- * NOTE: Releasing the socket lock while an operation is sleeping also ensures
- * that another operation that must be performed in a non-blocking manner is
- * not delayed for very long because the lock has already been taken.
- *
- * NOTE: This code assumes that certain fields of a port/socket pair are
- * constant over its lifetime; such fields can be examined without taking
- * the socket lock and/or port lock, and do not need to be re-read even
- * after resuming processing after waiting. These fields include:
- * - socket type
- * - pointer to socket sk structure (aka tipc_sock structure)
- * - pointer to port structure
- * - port reference
- */
- /**
- * advance_rx_queue - discard first buffer in socket receive queue
- *
- * Caller must hold socket lock
- */
- static void advance_rx_queue(struct sock *sk)
- {
- kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
- }
- /**
- * discard_rx_queue - discard all buffers in socket receive queue
- *
- * Caller must hold socket lock
- */
- static void discard_rx_queue(struct sock *sk)
- {
- struct sk_buff *buf;
- while ((buf = __skb_dequeue(&sk->sk_receive_queue)))
- kfree_skb(buf);
- }
- /**
- * reject_rx_queue - reject all buffers in socket receive queue
- *
- * Caller must hold socket lock
- */
- static void reject_rx_queue(struct sock *sk)
- {
- struct sk_buff *buf;
- while ((buf = __skb_dequeue(&sk->sk_receive_queue)))
- tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
- }
- /**
- * tipc_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_create(struct net *net, struct socket *sock, int protocol,
- int kern)
- {
- const struct proto_ops *ops;
- socket_state state;
- struct sock *sk;
- struct tipc_port *tp_ptr;
- /* Validate arguments */
- if (unlikely(protocol != 0))
- return -EPROTONOSUPPORT;
- switch (sock->type) {
- case SOCK_STREAM:
- ops = &stream_ops;
- state = SS_UNCONNECTED;
- break;
- case SOCK_SEQPACKET:
- ops = &packet_ops;
- state = SS_UNCONNECTED;
- break;
- case SOCK_DGRAM:
- case SOCK_RDM:
- ops = &msg_ops;
- state = SS_READY;
- break;
- default:
- return -EPROTOTYPE;
- }
- /* Allocate socket's protocol area */
- sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
- if (sk == NULL)
- return -ENOMEM;
- /* Allocate TIPC port for socket to use */
- tp_ptr = tipc_createport_raw(sk, &dispatch, &wakeupdispatch,
- TIPC_LOW_IMPORTANCE);
- if (unlikely(!tp_ptr)) {
- sk_free(sk);
- return -ENOMEM;
- }
- /* Finish initializing socket data structures */
- sock->ops = ops;
- sock->state = state;
- sock_init_data(sock, sk);
- sk->sk_backlog_rcv = backlog_rcv;
- sk->sk_rcvbuf = TIPC_FLOW_CONTROL_WIN * 2 * TIPC_MAX_USER_MSG_SIZE * 2;
- sk->sk_data_ready = tipc_data_ready;
- sk->sk_write_space = tipc_write_space;
- tipc_sk(sk)->p = tp_ptr;
- tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT;
- spin_unlock_bh(tp_ptr->lock);
- if (sock->state == SS_READY) {
- tipc_set_portunreturnable(tp_ptr->ref, 1);
- if (sock->type == SOCK_DGRAM)
- tipc_set_portunreliable(tp_ptr->ref, 1);
- }
- return 0;
- }
- /**
- * 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 release(struct socket *sock)
- {
- struct sock *sk = sock->sk;
- struct tipc_port *tport;
- struct sk_buff *buf;
- int res;
- /*
- * 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;
- tport = tipc_sk_port(sk);
- lock_sock(sk);
- /*
- * Reject all unreceived messages, except on an active connection
- * (which disconnects locally & sends a 'FIN+' to peer)
- */
- while (sock->state != SS_DISCONNECTING) {
- buf = __skb_dequeue(&sk->sk_receive_queue);
- if (buf == NULL)
- break;
- if (TIPC_SKB_CB(buf)->handle != 0)
- kfree_skb(buf);
- else {
- if ((sock->state == SS_CONNECTING) ||
- (sock->state == SS_CONNECTED)) {
- sock->state = SS_DISCONNECTING;
- tipc_disconnect(tport->ref);
- }
- tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
- }
- }
- /*
- * Delete TIPC port; this ensures no more messages are queued
- * (also disconnects an active connection & sends a 'FIN-' to peer)
- */
- res = tipc_deleteport(tport->ref);
- /* Discard any remaining (connection-based) messages in receive queue */
- discard_rx_queue(sk);
- /* Reject any messages that accumulated in backlog queue */
- sock->state = SS_DISCONNECTING;
- release_sock(sk);
- sock_put(sk);
- sock->sk = NULL;
- return res;
- }
- /**
- * 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 bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len)
- {
- struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
- u32 portref = tipc_sk_port(sock->sk)->ref;
- if (unlikely(!uaddr_len))
- return tipc_withdraw(portref, 0, NULL);
- if (uaddr_len < sizeof(struct sockaddr_tipc))
- return -EINVAL;
- if (addr->family != AF_TIPC)
- return -EAFNOSUPPORT;
- if (addr->addrtype == TIPC_ADDR_NAME)
- addr->addr.nameseq.upper = addr->addr.nameseq.lower;
- else if (addr->addrtype != TIPC_ADDR_NAMESEQ)
- return -EAFNOSUPPORT;
- if (addr->addr.nameseq.type < TIPC_RESERVED_TYPES)
- return -EACCES;
- return (addr->scope > 0) ?
- tipc_publish(portref, addr->scope, &addr->addr.nameseq) :
- tipc_withdraw(portref, -addr->scope, &addr->addr.nameseq);
- }
- /**
- * get_name - 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 get_name(struct socket *sock, struct sockaddr *uaddr,
- int *uaddr_len, int peer)
- {
- struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
- struct tipc_sock *tsock = tipc_sk(sock->sk);
- memset(addr, 0, sizeof(*addr));
- if (peer) {
- if ((sock->state != SS_CONNECTED) &&
- ((peer != 2) || (sock->state != SS_DISCONNECTING)))
- return -ENOTCONN;
- addr->addr.id.ref = tsock->peer_name.ref;
- addr->addr.id.node = tsock->peer_name.node;
- } else {
- addr->addr.id.ref = tsock->p->ref;
- addr->addr.id.node = tipc_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;
- }
- /**
- * 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 ...
- *
- * TIPC sets the returned events as follows:
- *
- * socket state flags set
- * ------------ ---------
- * unconnected no read flags
- * POLLOUT if port is not congested
- *
- * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
- * no write flags
- *
- * connected POLLIN/POLLRDNORM if data in rx queue
- * POLLOUT if port is not congested
- *
- * disconnecting POLLIN/POLLRDNORM/POLLHUP
- * no write flags
- *
- * listening POLLIN if SYN in rx queue
- * no write flags
- *
- * ready POLLIN/POLLRDNORM if data in rx queue
- * [connectionless] POLLOUT (since port cannot be congested)
- *
- * 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 poll(struct file *file, struct socket *sock,
- poll_table *wait)
- {
- struct sock *sk = sock->sk;
- u32 mask = 0;
- sock_poll_wait(file, sk_sleep(sk), wait);
- switch ((int)sock->state) {
- case SS_UNCONNECTED:
- if (!tipc_sk_port(sk)->congested)
- mask |= POLLOUT;
- break;
- case SS_READY:
- case SS_CONNECTED:
- if (!tipc_sk_port(sk)->congested)
- mask |= POLLOUT;
- /* fall thru' */
- case SS_CONNECTING:
- case SS_LISTENING:
- if (!skb_queue_empty(&sk->sk_receive_queue))
- mask |= (POLLIN | POLLRDNORM);
- break;
- case SS_DISCONNECTING:
- mask = (POLLIN | POLLRDNORM | POLLHUP);
- break;
- }
- return mask;
- }
- /**
- * dest_name_check - verify user is permitted to send to specified port name
- * @dest: destination address
- * @m: descriptor for message to be sent
- *
- * Prevents restricted configuration commands from being issued by
- * unauthorized users.
- *
- * Returns 0 if permission is granted, otherwise errno
- */
- static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
- {
- struct tipc_cfg_msg_hdr hdr;
- if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
- return 0;
- if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
- return 0;
- if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
- return -EACCES;
- if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr)))
- return -EMSGSIZE;
- if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
- return -EFAULT;
- if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
- return -EACCES;
- return 0;
- }
- /**
- * send_msg - send message in connectionless manner
- * @iocb: if NULL, indicates that socket lock is already held
- * @sock: socket structure
- * @m: message to send
- * @total_len: length of message
- *
- * 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 send_msg(struct kiocb *iocb, struct socket *sock,
- struct msghdr *m, size_t total_len)
- {
- struct sock *sk = sock->sk;
- struct tipc_port *tport = tipc_sk_port(sk);
- struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
- int needs_conn;
- long timeout_val;
- int res = -EINVAL;
- if (unlikely(!dest))
- return -EDESTADDRREQ;
- if (unlikely((m->msg_namelen < sizeof(*dest)) ||
- (dest->family != AF_TIPC)))
- return -EINVAL;
- if ((total_len > TIPC_MAX_USER_MSG_SIZE) ||
- (m->msg_iovlen > (unsigned int)INT_MAX))
- return -EMSGSIZE;
- if (iocb)
- lock_sock(sk);
- needs_conn = (sock->state != SS_READY);
- if (unlikely(needs_conn)) {
- if (sock->state == SS_LISTENING) {
- res = -EPIPE;
- goto exit;
- }
- if (sock->state != SS_UNCONNECTED) {
- res = -EISCONN;
- goto exit;
- }
- if ((tport->published) ||
- ((sock->type == SOCK_STREAM) && (total_len != 0))) {
- res = -EOPNOTSUPP;
- goto exit;
- }
- if (dest->addrtype == TIPC_ADDR_NAME) {
- tport->conn_type = dest->addr.name.name.type;
- tport->conn_instance = dest->addr.name.name.instance;
- }
- /* Abort any pending connection attempts (very unlikely) */
- reject_rx_queue(sk);
- }
- timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
- do {
- if (dest->addrtype == TIPC_ADDR_NAME) {
- res = dest_name_check(dest, m);
- if (res)
- break;
- res = tipc_send2name(tport->ref,
- &dest->addr.name.name,
- dest->addr.name.domain,
- m->msg_iovlen,
- m->msg_iov,
- total_len);
- } else if (dest->addrtype == TIPC_ADDR_ID) {
- res = tipc_send2port(tport->ref,
- &dest->addr.id,
- m->msg_iovlen,
- m->msg_iov,
- total_len);
- } else if (dest->addrtype == TIPC_ADDR_MCAST) {
- if (needs_conn) {
- res = -EOPNOTSUPP;
- break;
- }
- res = dest_name_check(dest, m);
- if (res)
- break;
- res = tipc_multicast(tport->ref,
- &dest->addr.nameseq,
- m->msg_iovlen,
- m->msg_iov,
- total_len);
- }
- if (likely(res != -ELINKCONG)) {
- if (needs_conn && (res >= 0))
- sock->state = SS_CONNECTING;
- break;
- }
- if (timeout_val <= 0L) {
- res = timeout_val ? timeout_val : -EWOULDBLOCK;
- break;
- }
- release_sock(sk);
- timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk),
- !tport->congested, timeout_val);
- lock_sock(sk);
- } while (1);
- exit:
- if (iocb)
- release_sock(sk);
- return res;
- }
- /**
- * send_packet - send a connection-oriented message
- * @iocb: if NULL, indicates that socket lock is already held
- * @sock: socket structure
- * @m: message to send
- * @total_len: length of message
- *
- * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
- *
- * Returns the number of bytes sent on success, or errno otherwise
- */
- static int send_packet(struct kiocb *iocb, struct socket *sock,
- struct msghdr *m, size_t total_len)
- {
- struct sock *sk = sock->sk;
- struct tipc_port *tport = tipc_sk_port(sk);
- struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
- long timeout_val;
- int res;
- /* Handle implied connection establishment */
- if (unlikely(dest))
- return send_msg(iocb, sock, m, total_len);
- if ((total_len > TIPC_MAX_USER_MSG_SIZE) ||
- (m->msg_iovlen > (unsigned int)INT_MAX))
- return -EMSGSIZE;
- if (iocb)
- lock_sock(sk);
- timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
- do {
- if (unlikely(sock->state != SS_CONNECTED)) {
- if (sock->state == SS_DISCONNECTING)
- res = -EPIPE;
- else
- res = -ENOTCONN;
- break;
- }
- res = tipc_send(tport->ref, m->msg_iovlen, m->msg_iov,
- total_len);
- if (likely(res != -ELINKCONG))
- break;
- if (timeout_val <= 0L) {
- res = timeout_val ? timeout_val : -EWOULDBLOCK;
- break;
- }
- release_sock(sk);
- timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk),
- (!tport->congested || !tport->connected), timeout_val);
- lock_sock(sk);
- } while (1);
- if (iocb)
- release_sock(sk);
- return res;
- }
- /**
- * send_stream - send stream-oriented data
- * @iocb: (unused)
- * @sock: socket structure
- * @m: data to send
- * @total_len: total length of data to be sent
- *
- * Used for SOCK_STREAM data.
- *
- * Returns the number of bytes sent on success (or partial success),
- * or errno if no data sent
- */
- static int send_stream(struct kiocb *iocb, struct socket *sock,
- struct msghdr *m, size_t total_len)
- {
- struct sock *sk = sock->sk;
- struct tipc_port *tport = tipc_sk_port(sk);
- struct msghdr my_msg;
- struct iovec my_iov;
- struct iovec *curr_iov;
- int curr_iovlen;
- char __user *curr_start;
- u32 hdr_size;
- int curr_left;
- int bytes_to_send;
- int bytes_sent;
- int res;
- lock_sock(sk);
- /* Handle special cases where there is no connection */
- if (unlikely(sock->state != SS_CONNECTED)) {
- if (sock->state == SS_UNCONNECTED) {
- res = send_packet(NULL, sock, m, total_len);
- goto exit;
- } else if (sock->state == SS_DISCONNECTING) {
- res = -EPIPE;
- goto exit;
- } else {
- res = -ENOTCONN;
- goto exit;
- }
- }
- if (unlikely(m->msg_name)) {
- res = -EISCONN;
- goto exit;
- }
- if ((total_len > (unsigned int)INT_MAX) ||
- (m->msg_iovlen > (unsigned int)INT_MAX)) {
- res = -EMSGSIZE;
- goto exit;
- }
- /*
- * Send each iovec entry using one or more messages
- *
- * Note: This algorithm is good for the most likely case
- * (i.e. one large iovec entry), but could be improved to pass sets
- * of small iovec entries into send_packet().
- */
- curr_iov = m->msg_iov;
- curr_iovlen = m->msg_iovlen;
- my_msg.msg_iov = &my_iov;
- my_msg.msg_iovlen = 1;
- my_msg.msg_flags = m->msg_flags;
- my_msg.msg_name = NULL;
- bytes_sent = 0;
- hdr_size = msg_hdr_sz(&tport->phdr);
- while (curr_iovlen--) {
- curr_start = curr_iov->iov_base;
- curr_left = curr_iov->iov_len;
- while (curr_left) {
- bytes_to_send = tport->max_pkt - hdr_size;
- if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE)
- bytes_to_send = TIPC_MAX_USER_MSG_SIZE;
- if (curr_left < bytes_to_send)
- bytes_to_send = curr_left;
- my_iov.iov_base = curr_start;
- my_iov.iov_len = bytes_to_send;
- res = send_packet(NULL, sock, &my_msg, bytes_to_send);
- if (res < 0) {
- if (bytes_sent)
- res = bytes_sent;
- goto exit;
- }
- curr_left -= bytes_to_send;
- curr_start += bytes_to_send;
- bytes_sent += bytes_to_send;
- }
- curr_iov++;
- }
- res = bytes_sent;
- exit:
- release_sock(sk);
- return res;
- }
- /**
- * auto_connect - complete connection setup to a remote port
- * @sock: socket structure
- * @msg: peer's response message
- *
- * Returns 0 on success, errno otherwise
- */
- static int auto_connect(struct socket *sock, struct tipc_msg *msg)
- {
- struct tipc_sock *tsock = tipc_sk(sock->sk);
- struct tipc_port *p_ptr;
- tsock->peer_name.ref = msg_origport(msg);
- tsock->peer_name.node = msg_orignode(msg);
- p_ptr = tipc_port_deref(tsock->p->ref);
- if (!p_ptr)
- return -EINVAL;
- __tipc_connect(tsock->p->ref, p_ptr, &tsock->peer_name);
- if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)
- return -EINVAL;
- msg_set_importance(&p_ptr->phdr, (u32)msg_importance(msg));
- sock->state = SS_CONNECTED;
- return 0;
- }
- /**
- * set_orig_addr - capture sender's address for received message
- * @m: descriptor for message info
- * @msg: received message header
- *
- * Note: Address is not captured if not requested by receiver.
- */
- static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
- {
- struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name;
- if (addr) {
- addr->family = AF_TIPC;
- addr->addrtype = TIPC_ADDR_ID;
- memset(&addr->addr, 0, sizeof(addr->addr));
- addr->addr.id.ref = msg_origport(msg);
- addr->addr.id.node = msg_orignode(msg);
- addr->addr.name.domain = 0; /* could leave uninitialized */
- addr->scope = 0; /* could leave uninitialized */
- m->msg_namelen = sizeof(struct sockaddr_tipc);
- }
- }
- /**
- * anc_data_recv - optionally capture ancillary data for received message
- * @m: descriptor for message info
- * @msg: received message header
- * @tport: TIPC port associated with message
- *
- * Note: Ancillary data is not captured if not requested by receiver.
- *
- * Returns 0 if successful, otherwise errno
- */
- static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
- struct tipc_port *tport)
- {
- 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 = (tport->conn_type != 0);
- anc_data[0] = tport->conn_type;
- anc_data[1] = tport->conn_instance;
- anc_data[2] = tport->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;
- }
- /**
- * recv_msg - receive packet-oriented message
- * @iocb: (unused)
- * @m: descriptor for message info
- * @buf_len: total size 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 recv_msg(struct kiocb *iocb, struct socket *sock,
- struct msghdr *m, size_t buf_len, int flags)
- {
- struct sock *sk = sock->sk;
- struct tipc_port *tport = tipc_sk_port(sk);
- struct sk_buff *buf;
- struct tipc_msg *msg;
- long timeout;
- unsigned int sz;
- u32 err;
- int res;
- /* Catch invalid receive requests */
- if (unlikely(!buf_len))
- return -EINVAL;
- lock_sock(sk);
- if (unlikely(sock->state == SS_UNCONNECTED)) {
- res = -ENOTCONN;
- goto exit;
- }
- timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
- restart:
- /* Look for a message in receive queue; wait if necessary */
- while (skb_queue_empty(&sk->sk_receive_queue)) {
- if (sock->state == SS_DISCONNECTING) {
- res = -ENOTCONN;
- goto exit;
- }
- if (timeout <= 0L) {
- res = timeout ? timeout : -EWOULDBLOCK;
- goto exit;
- }
- release_sock(sk);
- timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
- tipc_rx_ready(sock),
- timeout);
- lock_sock(sk);
- }
- /* Look at first message in receive queue */
- buf = skb_peek(&sk->sk_receive_queue);
- msg = buf_msg(buf);
- sz = msg_data_sz(msg);
- err = msg_errcode(msg);
- /* Discard an empty non-errored message & try again */
- if ((!sz) && (!err)) {
- advance_rx_queue(sk);
- goto restart;
- }
- /* Capture sender's address (optional) */
- set_orig_addr(m, msg);
- /* Capture ancillary data (optional) */
- res = anc_data_recv(m, msg, tport);
- if (res)
- goto exit;
- /* Capture message data (if valid) & compute return value (always) */
- if (!err) {
- if (unlikely(buf_len < sz)) {
- sz = buf_len;
- m->msg_flags |= MSG_TRUNC;
- }
- res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg),
- m->msg_iov, sz);
- if (res)
- goto exit;
- res = sz;
- } else {
- if ((sock->state == SS_READY) ||
- ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
- res = 0;
- else
- res = -ECONNRESET;
- }
- /* Consume received message (optional) */
- if (likely(!(flags & MSG_PEEK))) {
- if ((sock->state != SS_READY) &&
- (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
- tipc_acknowledge(tport->ref, tport->conn_unacked);
- advance_rx_queue(sk);
- }
- exit:
- release_sock(sk);
- return res;
- }
- /**
- * recv_stream - receive stream-oriented data
- * @iocb: (unused)
- * @m: descriptor for message info
- * @buf_len: 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 recv_stream(struct kiocb *iocb, struct socket *sock,
- struct msghdr *m, size_t buf_len, int flags)
- {
- struct sock *sk = sock->sk;
- struct tipc_port *tport = tipc_sk_port(sk);
- struct sk_buff *buf;
- struct tipc_msg *msg;
- long timeout;
- unsigned int sz;
- int sz_to_copy, target, needed;
- int sz_copied = 0;
- u32 err;
- int res = 0;
- /* Catch invalid receive attempts */
- if (unlikely(!buf_len))
- return -EINVAL;
- lock_sock(sk);
- if (unlikely((sock->state == SS_UNCONNECTED) ||
- (sock->state == SS_CONNECTING))) {
- res = -ENOTCONN;
- goto exit;
- }
- target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
- timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
- restart:
- /* Look for a message in receive queue; wait if necessary */
- while (skb_queue_empty(&sk->sk_receive_queue)) {
- if (sock->state == SS_DISCONNECTING) {
- res = -ENOTCONN;
- goto exit;
- }
- if (timeout <= 0L) {
- res = timeout ? timeout : -EWOULDBLOCK;
- goto exit;
- }
- release_sock(sk);
- timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
- tipc_rx_ready(sock),
- timeout);
- lock_sock(sk);
- }
- /* Look at first message in receive queue */
- buf = skb_peek(&sk->sk_receive_queue);
- msg = buf_msg(buf);
- sz = msg_data_sz(msg);
- err = msg_errcode(msg);
- /* Discard an empty non-errored message & try again */
- if ((!sz) && (!err)) {
- advance_rx_queue(sk);
- goto restart;
- }
- /* Optionally capture sender's address & ancillary data of first msg */
- if (sz_copied == 0) {
- set_orig_addr(m, msg);
- res = anc_data_recv(m, msg, tport);
- if (res)
- goto exit;
- }
- /* Capture message data (if valid) & compute return value (always) */
- if (!err) {
- u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
- sz -= offset;
- needed = (buf_len - sz_copied);
- sz_to_copy = (sz <= needed) ? sz : needed;
- res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset,
- m->msg_iov, sz_to_copy);
- if (res)
- goto exit;
- sz_copied += sz_to_copy;
- if (sz_to_copy < sz) {
- if (!(flags & MSG_PEEK))
- TIPC_SKB_CB(buf)->handle =
- (void *)(unsigned long)(offset + sz_to_copy);
- goto exit;
- }
- } else {
- if (sz_copied != 0)
- goto exit; /* can't add error msg to valid data */
- if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
- res = 0;
- else
- res = -ECONNRESET;
- }
- /* Consume received message (optional) */
- if (likely(!(flags & MSG_PEEK))) {
- if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
- tipc_acknowledge(tport->ref, tport->conn_unacked);
- advance_rx_queue(sk);
- }
- /* Loop around if more data is required */
- if ((sz_copied < buf_len) && /* didn't get all requested data */
- (!skb_queue_empty(&sk->sk_receive_queue) ||
- (sz_copied < target)) && /* and more is ready or required */
- (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
- (!err)) /* and haven't reached a FIN */
- goto restart;
- exit:
- release_sock(sk);
- return sz_copied ? sz_copied : res;
- }
- /**
- * 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 (wq_has_sleeper(wq))
- wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
- POLLWRNORM | POLLWRBAND);
- 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, int len)
- {
- struct socket_wq *wq;
- rcu_read_lock();
- wq = rcu_dereference(sk->sk_wq);
- if (wq_has_sleeper(wq))
- wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
- POLLRDNORM | POLLRDBAND);
- rcu_read_unlock();
- }
- /**
- * rx_queue_full - determine if receive queue can accept another message
- * @msg: message to be added to queue
- * @queue_size: current size of queue
- * @base: nominal maximum size of queue
- *
- * Returns 1 if queue is unable to accept message, 0 otherwise
- */
- static int rx_queue_full(struct tipc_msg *msg, u32 queue_size, u32 base)
- {
- u32 threshold;
- u32 imp = msg_importance(msg);
- if (imp == TIPC_LOW_IMPORTANCE)
- threshold = base;
- else if (imp == TIPC_MEDIUM_IMPORTANCE)
- threshold = base * 2;
- else if (imp == TIPC_HIGH_IMPORTANCE)
- threshold = base * 100;
- else
- return 0;
- if (msg_connected(msg))
- threshold *= 4;
- return queue_size >= threshold;
- }
- /**
- * filter_connect - Handle all incoming messages for a connection-based socket
- * @tsock: TIPC socket
- * @msg: message
- *
- * Returns TIPC error status code and socket error status code
- * once it encounters some errors
- */
- static u32 filter_connect(struct tipc_sock *tsock, struct sk_buff **buf)
- {
- struct socket *sock = tsock->sk.sk_socket;
- struct tipc_msg *msg = buf_msg(*buf);
- struct sock *sk = &tsock->sk;
- u32 retval = TIPC_ERR_NO_PORT;
- int res;
- if (msg_mcast(msg))
- return retval;
- switch ((int)sock->state) {
- case SS_CONNECTED:
- /* Accept only connection-based messages sent by peer */
- if (msg_connected(msg) && tipc_port_peer_msg(tsock->p, msg)) {
- if (unlikely(msg_errcode(msg))) {
- sock->state = SS_DISCONNECTING;
- __tipc_disconnect(tsock->p);
- }
- retval = TIPC_OK;
- }
- break;
- case SS_CONNECTING:
- /* Accept only ACK or NACK message */
- if (unlikely(msg_errcode(msg))) {
- sock->state = SS_DISCONNECTING;
- sk->sk_err = ECONNREFUSED;
- retval = TIPC_OK;
- break;
- }
- if (unlikely(!msg_connected(msg)))
- break;
- res = auto_connect(sock, msg);
- if (res) {
- sock->state = SS_DISCONNECTING;
- sk->sk_err = -res;
- retval = TIPC_OK;
- break;
- }
- /* If an incoming message is an 'ACK-', it should be
- * discarded here because it doesn't contain useful
- * data. In addition, we should try to wake up
- * connect() routine if sleeping.
- */
- if (msg_data_sz(msg) == 0) {
- kfree_skb(*buf);
- *buf = NULL;
- if (waitqueue_active(sk_sleep(sk)))
- wake_up_interruptible(sk_sleep(sk));
- }
- retval = TIPC_OK;
- break;
- case SS_LISTENING:
- case SS_UNCONNECTED:
- /* Accept only SYN message */
- if (!msg_connected(msg) && !(msg_errcode(msg)))
- retval = TIPC_OK;
- break;
- case SS_DISCONNECTING:
- break;
- default:
- pr_err("Unknown socket state %u\n", sock->state);
- }
- return retval;
- }
- /**
- * filter_rcv - validate incoming message
- * @sk: socket
- * @buf: message
- *
- * Enqueues message on receive queue if acceptable; optionally handles
- * disconnect indication for a connected socket.
- *
- * Called with socket lock already taken; port lock may also be taken.
- *
- * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
- */
- static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
- {
- struct socket *sock = sk->sk_socket;
- struct tipc_msg *msg = buf_msg(buf);
- u32 recv_q_len;
- u32 res = TIPC_OK;
- /* Reject message if it is wrong sort of message for socket */
- if (msg_type(msg) > TIPC_DIRECT_MSG)
- return TIPC_ERR_NO_PORT;
- if (sock->state == SS_READY) {
- if (msg_connected(msg))
- return TIPC_ERR_NO_PORT;
- } else {
- res = filter_connect(tipc_sk(sk), &buf);
- if (res != TIPC_OK || buf == NULL)
- return res;
- }
- /* Reject message if there isn't room to queue it */
- recv_q_len = skb_queue_len(&sk->sk_receive_queue);
- if (unlikely(recv_q_len >= (OVERLOAD_LIMIT_BASE / 2))) {
- if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE / 2))
- return TIPC_ERR_OVERLOAD;
- }
- /* Enqueue message (finally!) */
- TIPC_SKB_CB(buf)->handle = 0;
- __skb_queue_tail(&sk->sk_receive_queue, buf);
- sk->sk_data_ready(sk, 0);
- return TIPC_OK;
- }
- /**
- * backlog_rcv - handle incoming message from backlog queue
- * @sk: socket
- * @buf: message
- *
- * Caller must hold socket lock, but not port lock.
- *
- * Returns 0
- */
- static int backlog_rcv(struct sock *sk, struct sk_buff *buf)
- {
- u32 res;
- res = filter_rcv(sk, buf);
- if (res)
- tipc_reject_msg(buf, res);
- return 0;
- }
- /**
- * dispatch - handle incoming message
- * @tport: TIPC port that received message
- * @buf: message
- *
- * Called with port lock already taken.
- *
- * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
- */
- static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
- {
- struct sock *sk = (struct sock *)tport->usr_handle;
- u32 res;
- /*
- * Process message if socket is unlocked; otherwise add to backlog queue
- *
- * This code is based on sk_receive_skb(), but must be distinct from it
- * since a TIPC-specific filter/reject mechanism is utilized
- */
- bh_lock_sock(sk);
- if (!sock_owned_by_user(sk)) {
- res = filter_rcv(sk, buf);
- } else {
- if (sk_add_backlog(sk, buf, sk->sk_rcvbuf))
- res = TIPC_ERR_OVERLOAD;
- else
- res = TIPC_OK;
- }
- bh_unlock_sock(sk);
- return res;
- }
- /**
- * wakeupdispatch - wake up port after congestion
- * @tport: port to wakeup
- *
- * Called with port lock already taken.
- */
- static void wakeupdispatch(struct tipc_port *tport)
- {
- struct sock *sk = (struct sock *)tport->usr_handle;
- sk->sk_write_space(sk);
- }
- /**
- * 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 connect(struct socket *sock, struct sockaddr *dest, int destlen,
- int flags)
- {
- struct sock *sk = sock->sk;
- struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
- struct msghdr m = {NULL,};
- unsigned int timeout;
- int res;
- lock_sock(sk);
- /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
- if (sock->state == SS_READY) {
- res = -EOPNOTSUPP;
- goto exit;
- }
- /*
- * Reject connection attempt using multicast address
- *
- * Note: send_msg() validates the rest of the address fields,
- * so there's no need to do it here
- */
- if (dst->addrtype == TIPC_ADDR_MCAST) {
- res = -EINVAL;
- goto exit;
- }
- timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout;
- switch (sock->state) {
- case SS_UNCONNECTED:
- /* 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 = send_msg(NULL, sock, &m, 0);
- if ((res < 0) && (res != -EWOULDBLOCK))
- goto exit;
- /* Just entered SS_CONNECTING state; the only
- * difference is that return value in non-blocking
- * case is EINPROGRESS, rather than EALREADY.
- */
- res = -EINPROGRESS;
- break;
- case SS_CONNECTING:
- res = -EALREADY;
- break;
- case SS_CONNECTED:
- res = -EISCONN;
- break;
- default:
- res = -EINVAL;
- goto exit;
- }
- if (sock->state == SS_CONNECTING) {
- if (!timeout)
- goto exit;
- /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
- release_sock(sk);
- res = wait_event_interruptible_timeout(*sk_sleep(sk),
- sock->state != SS_CONNECTING,
- timeout ? (long)msecs_to_jiffies(timeout)
- : MAX_SCHEDULE_TIMEOUT);
- lock_sock(sk);
- if (res <= 0) {
- if (res == 0)
- res = -ETIMEDOUT;
- else
- ; /* leave "res" unchanged */
- goto exit;
- }
- }
- if (unlikely(sock->state == SS_DISCONNECTING))
- res = sock_error(sk);
- else
- res = 0;
- exit:
- release_sock(sk);
- return res;
- }
- /**
- * listen - allow socket to listen for incoming connections
- * @sock: socket structure
- * @len: (unused)
- *
- * Returns 0 on success, errno otherwise
- */
- static int listen(struct socket *sock, int len)
- {
- struct sock *sk = sock->sk;
- int res;
- lock_sock(sk);
- if (sock->state != SS_UNCONNECTED)
- res = -EINVAL;
- else {
- sock->state = SS_LISTENING;
- res = 0;
- }
- release_sock(sk);
- return res;
- }
- /**
- * 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 accept(struct socket *sock, struct socket *new_sock, int flags)
- {
- struct sock *new_sk, *sk = sock->sk;
- struct sk_buff *buf;
- struct tipc_sock *new_tsock;
- struct tipc_port *new_tport;
- struct tipc_msg *msg;
- u32 new_ref;
- int res;
- lock_sock(sk);
- if (sock->state != SS_LISTENING) {
- res = -EINVAL;
- goto exit;
- }
- while (skb_queue_empty(&sk->sk_receive_queue)) {
- if (flags & O_NONBLOCK) {
- res = -EWOULDBLOCK;
- goto exit;
- }
- release_sock(sk);
- res = wait_event_interruptible(*sk_sleep(sk),
- (!skb_queue_empty(&sk->sk_receive_queue)));
- lock_sock(sk);
- if (res)
- goto exit;
- }
- buf = skb_peek(&sk->sk_receive_queue);
- res = tipc_create(sock_net(sock->sk), new_sock, 0, 0);
- if (res)
- goto exit;
- new_sk = new_sock->sk;
- new_tsock = tipc_sk(new_sk);
- new_tport = new_tsock->p;
- new_ref = new_tport->ref;
- 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)
- */
- reject_rx_queue(new_sk);
- /* Connect new socket to it's peer */
- new_tsock->peer_name.ref = msg_origport(msg);
- new_tsock->peer_name.node = msg_orignode(msg);
- tipc_connect(new_ref, &new_tsock->peer_name);
- new_sock->state = SS_CONNECTED;
- tipc_set_portimportance(new_ref, msg_importance(msg));
- if (msg_named(msg)) {
- new_tport->conn_type = msg_nametype(msg);
- new_tport->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,};
- advance_rx_queue(sk);
- send_packet(NULL, new_sock, &m, 0);
- } else {
- __skb_dequeue(&sk->sk_receive_queue);
- __skb_queue_head(&new_sk->sk_receive_queue, buf);
- }
- release_sock(new_sk);
- exit:
- release_sock(sk);
- return res;
- }
- /**
- * 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 shutdown(struct socket *sock, int how)
- {
- struct sock *sk = sock->sk;
- struct tipc_port *tport = tipc_sk_port(sk);
- struct sk_buff *buf;
- int res;
- if (how != SHUT_RDWR)
- return -EINVAL;
- lock_sock(sk);
- switch (sock->state) {
- case SS_CONNECTING:
- case SS_CONNECTED:
- restart:
- /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
- buf = __skb_dequeue(&sk->sk_receive_queue);
- if (buf) {
- if (TIPC_SKB_CB(buf)->handle != 0) {
- kfree_skb(buf);
- goto restart;
- }
- tipc_disconnect(tport->ref);
- tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
- } else {
- tipc_shutdown(tport->ref);
- }
- sock->state = SS_DISCONNECTING;
- /* fall through */
- case SS_DISCONNECTING:
- /* Discard any unreceived messages */
- discard_rx_queue(sk);
- /* Wake up anyone sleeping in poll */
- sk->sk_state_change(sk);
- res = 0;
- break;
- default:
- res = -ENOTCONN;
- }
- release_sock(sk);
- return res;
- }
- /**
- * 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 setsockopt(struct socket *sock,
- int lvl, int opt, char __user *ov, unsigned int ol)
- {
- struct sock *sk = sock->sk;
- struct tipc_port *tport = tipc_sk_port(sk);
- u32 value;
- int res;
- if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
- return 0;
- if (lvl != SOL_TIPC)
- return -ENOPROTOOPT;
- if (ol < sizeof(value))
- return -EINVAL;
- res = get_user(value, (u32 __user *)ov);
- if (res)
- return res;
- lock_sock(sk);
- switch (opt) {
- case TIPC_IMPORTANCE:
- res = tipc_set_portimportance(tport->ref, value);
- break;
- case TIPC_SRC_DROPPABLE:
- if (sock->type != SOCK_STREAM)
- res = tipc_set_portunreliable(tport->ref, value);
- else
- res = -ENOPROTOOPT;
- break;
- case TIPC_DEST_DROPPABLE:
- res = tipc_set_portunreturnable(tport->ref, value);
- break;
- case TIPC_CONN_TIMEOUT:
- tipc_sk(sk)->conn_timeout = value;
- /* no need to set "res", since already 0 at this point */
- break;
- default:
- res = -EINVAL;
- }
- release_sock(sk);
- return res;
- }
- /**
- * 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 getsockopt(struct socket *sock,
- int lvl, int opt, char __user *ov, int __user *ol)
- {
- struct sock *sk = sock->sk;
- struct tipc_port *tport = tipc_sk_port(sk);
- int len;
- 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:
- res = tipc_portimportance(tport->ref, &value);
- break;
- case TIPC_SRC_DROPPABLE:
- res = tipc_portunreliable(tport->ref, &value);
- break;
- case TIPC_DEST_DROPPABLE:
- res = tipc_portunreturnable(tport->ref, &value);
- break;
- case TIPC_CONN_TIMEOUT:
- value = tipc_sk(sk)->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;
- 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);
- }
- /* Protocol switches for the various types of TIPC sockets */
- static const struct proto_ops msg_ops = {
- .owner = THIS_MODULE,
- .family = AF_TIPC,
- .release = release,
- .bind = bind,
- .connect = connect,
- .socketpair = sock_no_socketpair,
- .accept = sock_no_accept,
- .getname = get_name,
- .poll = poll,
- .ioctl = sock_no_ioctl,
- .listen = sock_no_listen,
- .shutdown = shutdown,
- .setsockopt = setsockopt,
- .getsockopt = getsockopt,
- .sendmsg = send_msg,
- .recvmsg = recv_msg,
- .mmap = sock_no_mmap,
- .sendpage = sock_no_sendpage
- };
- static const struct proto_ops packet_ops = {
- .owner = THIS_MODULE,
- .family = AF_TIPC,
- .release = release,
- .bind = bind,
- .connect = connect,
- .socketpair = sock_no_socketpair,
- .accept = accept,
- .getname = get_name,
- .poll = poll,
- .ioctl = sock_no_ioctl,
- .listen = listen,
- .shutdown = shutdown,
- .setsockopt = setsockopt,
- .getsockopt = getsockopt,
- .sendmsg = send_packet,
- .recvmsg = recv_msg,
- .mmap = sock_no_mmap,
- .sendpage = sock_no_sendpage
- };
- static const struct proto_ops stream_ops = {
- .owner = THIS_MODULE,
- .family = AF_TIPC,
- .release = release,
- .bind = bind,
- .connect = connect,
- .socketpair = sock_no_socketpair,
- .accept = accept,
- .getname = get_name,
- .poll = poll,
- .ioctl = sock_no_ioctl,
- .listen = listen,
- .shutdown = shutdown,
- .setsockopt = setsockopt,
- .getsockopt = getsockopt,
- .sendmsg = send_stream,
- .recvmsg = recv_stream,
- .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_create
- };
- static struct proto tipc_proto = {
- .name = "TIPC",
- .owner = THIS_MODULE,
- .obj_size = sizeof(struct tipc_sock)
- };
- /**
- * 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;
- }
- sockets_enabled = 1;
- out:
- return res;
- }
- /**
- * tipc_socket_stop - stop TIPC socket interface
- */
- void tipc_socket_stop(void)
- {
- if (!sockets_enabled)
- return;
- sockets_enabled = 0;
- sock_unregister(tipc_family_ops.family);
- proto_unregister(&tipc_proto);
- }